Attachment 2 - Preliminary Design Report - Meyers Creek Drainage Study — Mayor and City Council, October 21, 2026 (part 2 of 5)

TOTAL AREA(ACRES) = 135.4
LONGEST FLOWPATH FROM NODE 1105.00 TO NODE 1105.00 = 3161.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 1105.00 TO NODE 1106.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0090
FLOW LENGTH(FEET) = 34.80 MANNING'S N = 0.013

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 24.38
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 48.00 NUMBER OF PIPES = 1
PIPE-FLOW(CFS) = 306.35
PIPE TRAVEL TIME(MIN.) = 0.02 Tc(MIN.) = 14.57
LONGEST FLOWPATH FROM NODE 1105.00 TO NODE 1106.00 = 3195.80 FEET. **************************************************************************** FLOW PROCESS FROM NODE 1106.00 TO NODE 704.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0068
FLOW LENGTH(FEET) = 416.81 MANNING'S N = 0.013
DEPTH OF FLOW IN 81.0 INCH PIPE IS 48.8 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 13.61
GIVEN PIPE DIAMETER(INCH) = 81.00 NUMBER OF PIPES = 1
PIPE-FLOW(CFS) = 306.35
PIPE TRAVEL TIME(MIN.) = 0.51 Tc(MIN.) = 15.08
LONGEST FLOWPATH FROM NODE 1105.00 TO NODE 704.00 = 3612.61 FEET. **************************************************************************** FLOW PROCESS FROM NODE 704.00 TO NODE 704.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 3 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 300.41 12.06 3.083 0.28( 0.26) 0.92 107.4 1100.00
2 306.35 15.08 2.536 0.28( 0.26) 0.92 135.4 1105.00
LONGEST FLOWPATH FROM NODE 1105.00 TO NODE 704.00 = 3612.61 FEET. ** MEMORY BANK # 3 CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
Meyers Creek – Existing Condition 2024

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1 27.93 9.63 3.534 0.87( 0.40) 0.46 9.9 700.00
LONGEST FLOWPATH FROM NODE 700.00 TO NODE 704.00 = 1652.00 FEET. ** PEAK FLOW RATE TABLE **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 305.88 9.63 3.534 0.31( 0.27) 0.87 95.6 700.00
2 324.33 12.06 3.083 0.31( 0.27) 0.88 117.3 1100.00
3 325.39 15.08 2.536 0.30( 0.27) 0.89 145.3 1105.00
TOTAL AREA(ACRES) = 145.3
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 325.39 Tc(MIN.) = 15.084
EFFECTIVE AREA(ACRES) = 145.29 AREA-AVERAGED Fm(INCH/HR) = 0.27 AREA-AVERAGED Fp(INCH/HR) = 0.31 AREA-AVERAGED Ap = 0.88 TOTAL AREA(ACRES) = 145.3
LONGEST FLOWPATH FROM NODE 1105.00 TO NODE 704.00 = 3612.61 FEET. **************************************************************************** FLOW PROCESS FROM NODE 704.00 TO NODE 704.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 3 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 704.00 TO NODE 110.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0060
FLOW LENGTH(FEET) = 284.58 MANNING'S N = 0.013
DEPTH OF FLOW IN 87.0 INCH PIPE IS 50.1 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 13.21
GIVEN PIPE DIAMETER(INCH) = 87.00 NUMBER OF PIPES = 1
PIPE-FLOW(CFS) = 325.39
PIPE TRAVEL TIME(MIN.) = 0.36 Tc(MIN.) = 15.44
LONGEST FLOWPATH FROM NODE 1105.00 TO NODE 110.00 = 3897.19 FEET. **************************************************************************** FLOW PROCESS FROM NODE 110.00 TO NODE 110.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 2 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 305.88 9.99 3.467 0.31( 0.27) 0.87 95.6 700.00
2 324.33 12.42 3.017 0.31( 0.27) 0.88 117.3 1100.00
Meyers Creek – Existing Condition 2024

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3 325.39 15.44 2.521 0.30( 0.27) 0.89 145.3 1105.00
LONGEST FLOWPATH FROM NODE 1105.00 TO NODE 110.00 = 3897.19 FEET. ** MEMORY BANK # 2 CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 820.38 12.70 2.965 0.47( 0.38) 0.80 338.5 600.00
2 820.81 12.75 2.956 0.47( 0.38) 0.80 339.7 200.00
3 827.61 13.62 2.795 0.47( 0.38) 0.80 361.1 100.00
4 854.71 17.74 2.421 0.47( 0.38) 0.81 456.3 500.00
5 980.08 24.71 2.119 0.46( 0.38) 0.83 613.2 300.00
6 980.38 25.04 2.105 0.46( 0.38) 0.83 618.1 400.00
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 110.00 = 4083.00 FEET. ** PEAK FLOW RATE TABLE **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 1076.15 9.99 3.467 0.43( 0.35) 0.81 361.8 700.00
2 1142.70 12.42 3.017 0.43( 0.35) 0.82 448.4 1100.00
3 1144.81 12.70 2.965 0.43( 0.35) 0.82 458.3 600.00
4 1145.25 12.75 2.956 0.43( 0.35) 0.82 460.0 200.00
5 1152.36 13.62 2.795 0.43( 0.35) 0.82 489.5 100.00
6 1164.98 15.44 2.521 0.42( 0.35) 0.83 548.5 1105.00
7 1165.73 17.74 2.421 0.42( 0.35) 0.83 601.6 500.00
8 1247.52 24.71 2.119 0.43( 0.36) 0.84 758.5 300.00
9 1245.74 25.04 2.105 0.43( 0.36) 0.84 763.4 400.00
TOTAL AREA(ACRES) = 763.4
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 1247.52 Tc(MIN.) = 24.708
EFFECTIVE AREA(ACRES) = 758.47 AREA-AVERAGED Fm(INCH/HR) = 0.36 AREA-AVERAGED Fp(INCH/HR) = 0.43 AREA-AVERAGED Ap = 0.84 TOTAL AREA(ACRES) = 763.4
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 110.00 = 4083.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 110.00 TO NODE 110.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 2 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 110.00 TO NODE 111.00 IS CODE = 51 ---------------------------------------------------------------------------- >>>>>COMPUTE TRAPEZOIDAL CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA (EXISTING ELEMENT)<<<<<
============================================================================ CHANNEL LENGTH THRU SUBAREA(FEET) = 571.00
REPRESENTATIVE CHANNEL SLOPE = 0.0230
CHANNEL BASE(FEET) = 11.00 "Z" FACTOR = 2.000
Meyers Creek – Existing Condition 2024

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MANNING'S FACTOR = 0.035 MAXIMUM DEPTH(FEET) = 6.50
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 2.088
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.77 0.98 0.500 32
COMMERCIAL A 0.02 0.98 0.100 32

RESIDENTIAL
"5-7 DWELLINGS/ACRE" B 0.05 0.75 0.500 56
COMMERCIAL B 0.01 0.75 0.100 56
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.96
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.486
TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 1248.14 TRAVEL TIME THRU SUBAREA BASED ON VELOCITY(FEET/SEC.) = 13.28 AVERAGE FLOW DEPTH(FEET) = 4.64 TRAVEL TIME(MIN.) = 0.72 Tc(MIN.) = 25.42
SUBAREA AREA(ACRES) = 0.85 SUBAREA RUNOFF(CFS) = 1.24
EFFECTIVE AREA(ACRES) = 759.32 AREA-AVERAGED Fm(INCH/HR) = 0.36 AREA-AVERAGED Fp(INCH/HR) = 0.43 AREA-AVERAGED Ap = 0.84 TOTAL AREA(ACRES) = 764.2 PEAK FLOW RATE(CFS) = 1247.52 NOTE: PEAK FLOW RATE DEFAULTED TO UPSTREAM VALUE
END OF SUBAREA CHANNEL FLOW HYDRAULICS:

DEPTH(FEET) = 4.64 FLOW VELOCITY(FEET/SEC.) = 13.27
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 111.00 = 4654.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 111.00 TO NODE 112.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0230
FLOW LENGTH(FEET) = 52.00 MANNING'S N = 0.013

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 88.24
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 36.00 NUMBER OF PIPES = 2
PIPE-FLOW(CFS) = 1247.52
PIPE TRAVEL TIME(MIN.) = 0.01 Tc(MIN.) = 25.43
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 112.00 = 4706.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 112.00 TO NODE 113.00 IS CODE = 51 ---------------------------------------------------------------------------- >>>>>COMPUTE TRAPEZOIDAL CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA (EXISTING ELEMENT)<<<<<
============================================================================ CHANNEL LENGTH THRU SUBAREA(FEET) = 618.00
Meyers Creek – Existing Condition 2024

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REPRESENTATIVE CHANNEL SLOPE = 0.0290
CHANNEL BASE(FEET) = 4.00 "Z" FACTOR = 2.000
MANNING'S FACTOR = 0.035 MAXIMUM DEPTH(FEET) = 6.20
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 2.058
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.69 0.98 0.500 32
COMMERCIAL A 0.07 0.98 0.100 32
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.98
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.463
TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 1248.07 TRAVEL TIME THRU SUBAREA BASED ON VELOCITY(FEET/SEC.) = 14.78 AVERAGE FLOW DEPTH(FEET) = 5.57 TRAVEL TIME(MIN.) = 0.70 Tc(MIN.) = 26.13
SUBAREA AREA(ACRES) = 0.76 SUBAREA RUNOFF(CFS) = 1.10
EFFECTIVE AREA(ACRES) = 760.08 AREA-AVERAGED Fm(INCH/HR) = 0.36 AREA-AVERAGED Fp(INCH/HR) = 0.43 AREA-AVERAGED Ap = 0.84 TOTAL AREA(ACRES) = 765.0 PEAK FLOW RATE(CFS) = 1247.52 NOTE: PEAK FLOW RATE DEFAULTED TO UPSTREAM VALUE
END OF SUBAREA CHANNEL FLOW HYDRAULICS:

DEPTH(FEET) = 5.57 FLOW VELOCITY(FEET/SEC.) = 14.77
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 113.00 = 5324.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 113.00 TO NODE 113.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<<
============================================================================ TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE:

TIME OF CONCENTRATION(MIN.) = 26.13
RAINFALL INTENSITY(INCH/HR) = 2.06
AREA-AVERAGED Fm(INCH/HR) = 0.36
AREA-AVERAGED Fp(INCH/HR) = 0.43
AREA-AVERAGED Ap = 0.84
EFFECTIVE STREAM AREA(ACRES) = 760.08
TOTAL STREAM AREA(ACRES) = 764.98
PEAK FLOW RATE(CFS) AT CONFLUENCE = 1247.52
**************************************************************************** FLOW PROCESS FROM NODE 1300.00 TO NODE 1301.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
>>USE TIME-OF-CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< ============================================================================ INITIAL SUBAREA FLOW-LENGTH(FEET) = 462.00
ELEVATION DATA: UPSTREAM(FEET) = 1889.00 DOWNSTREAM(FEET) = 1858.00 Meyers Creek – Existing Condition 2024

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Tc = K*[(LENGTH** 3.00)/(ELEVATION CHANGE)]**0.20
SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = 7.771
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 3.877
SUBAREA Tc AND LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS Tc
LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN (MIN.)

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 1.40 0.98 0.500 32 7.77
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.98
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA RUNOFF(CFS) = 4.28
TOTAL AREA(ACRES) = 1.40 PEAK FLOW RATE(CFS) = 4.28
**************************************************************************** FLOW PROCESS FROM NODE 1301.00 TO NODE 1302.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1858.00 DOWNSTREAM(FEET) = 1842.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 221.00 CHANNEL SLOPE = 0.0724 CHANNEL FLOW THRU SUBAREA(CFS) = 4.28
FLOW VELOCITY(FEET/SEC) = 5.47 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.67 Tc(MIN.) = 8.44
LONGEST FLOWPATH FROM NODE 1300.00 TO NODE 1302.00 = 683.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 1302.00 TO NODE 1302.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 8.44
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 3.753
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.88 0.98 0.500 32

RESIDENTIAL
"5-7 DWELLINGS/ACRE" B 0.08 0.75 0.500 56
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.96
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA AREA(ACRES) = 0.96 SUBAREA RUNOFF(CFS) = 2.84
EFFECTIVE AREA(ACRES) = 2.36 AREA-AVERAGED Fm(INCH/HR) = 0.48 AREA-AVERAGED Fp(INCH/HR) = 0.97 AREA-AVERAGED Ap = 0.50 TOTAL AREA(ACRES) = 2.4 PEAK FLOW RATE(CFS) = 6.96
**************************************************************************** FLOW PROCESS FROM NODE 1302.00 TO NODE 1302.00 IS CODE = 81 Meyers Creek – Existing Condition 2024

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---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 8.44
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 3.753
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.76 0.98 0.500 32

RESIDENTIAL
"5-7 DWELLINGS/ACRE" B 0.75 0.75 0.500 56
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.86
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA AREA(ACRES) = 1.51 SUBAREA RUNOFF(CFS) = 4.51
EFFECTIVE AREA(ACRES) = 3.87 AREA-AVERAGED Fm(INCH/HR) = 0.46 AREA-AVERAGED Fp(INCH/HR) = 0.93 AREA-AVERAGED Ap = 0.50 TOTAL AREA(ACRES) = 3.9 PEAK FLOW RATE(CFS) = 11.47
**************************************************************************** FLOW PROCESS FROM NODE 1302.00 TO NODE 113.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1842.00 DOWNSTREAM(FEET) = 1814.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 849.00 CHANNEL SLOPE = 0.0330 CHANNEL FLOW THRU SUBAREA(CFS) = 11.47
FLOW VELOCITY(FEET/SEC) = 4.70 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 3.01 Tc(MIN.) = 11.45
LONGEST FLOWPATH FROM NODE 1300.00 TO NODE 113.00 = 1532.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 113.00 TO NODE 113.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 11.45
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 3.196
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.85 0.98 0.500 32

RESIDENTIAL
"5-7 DWELLINGS/ACRE" B 0.34 0.75 0.500 56
COMMERCIAL A 0.09 0.98 0.100 32
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.91
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.472
SUBAREA AREA(ACRES) = 1.27 SUBAREA RUNOFF(CFS) = 3.17
Meyers Creek – Existing Condition 2024

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EFFECTIVE AREA(ACRES) = 5.15 AREA-AVERAGED Fm(INCH/HR) = 0.45 AREA-AVERAGED Fp(INCH/HR) = 0.92 AREA-AVERAGED Ap = 0.49 TOTAL AREA(ACRES) = 5.1 PEAK FLOW RATE(CFS) = 12.70
**************************************************************************** FLOW PROCESS FROM NODE 113.00 TO NODE 113.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<<
>>>>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<<<<< ============================================================================ TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE:

TIME OF CONCENTRATION(MIN.) = 11.45
RAINFALL INTENSITY(INCH/HR) = 3.20
AREA-AVERAGED Fm(INCH/HR) = 0.45
AREA-AVERAGED Fp(INCH/HR) = 0.92
AREA-AVERAGED Ap = 0.49
EFFECTIVE STREAM AREA(ACRES) = 5.15
TOTAL STREAM AREA(ACRES) = 5.15
PEAK FLOW RATE(CFS) AT CONFLUENCE = 12.70
** CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 1076.15 11.47 3.193 0.43( 0.35) 0.81 363.4 700.00
1 1142.70 13.88 2.747 0.43( 0.35) 0.82 450.0 1100.00
1 1144.81 14.16 2.696 0.43( 0.35) 0.82 460.0 600.00
1 1145.25 14.21 2.687 0.43( 0.35) 0.82 461.6 200.00
1 1152.36 15.08 2.537 0.43( 0.35) 0.82 491.1 100.00
1 1164.98 16.89 2.458 0.42( 0.35) 0.82 550.1 1105.00
1 1165.73 19.19 2.358 0.42( 0.35) 0.83 603.2 500.00
1 1247.52 26.13 2.058 0.43( 0.36) 0.84 760.1 300.00
1 1245.74 26.46 2.043 0.43( 0.36) 0.84 765.0 400.00
2 12.70 11.45 3.196 0.92( 0.45) 0.49 5.1 1300.00

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10 1253.10 26.46 2.043 0.43( 0.36) 0.84 770.1 400.00
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 1254.95 Tc(MIN.) = 26.13
EFFECTIVE AREA(ACRES) = 765.22 AREA-AVERAGED Fm(INCH/HR) = 0.36 AREA-AVERAGED Fp(INCH/HR) = 0.43 AREA-AVERAGED Ap = 0.83 TOTAL AREA(ACRES) = 770.1
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 113.00 = 5324.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 113.00 TO NODE 114.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1814.00 DOWNSTREAM(FEET) = 1790.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 687.00 CHANNEL SLOPE = 0.0349 CHANNEL FLOW THRU SUBAREA(CFS) = 1254.95
FLOW VELOCITY(FEET/SEC) = 19.73 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.58 Tc(MIN.) = 26.71
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 114.00 = 6011.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 114.00 TO NODE 114.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 26.71
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 2.033
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 2.09 0.98 0.500 32

NATURAL GOOD COVER
"MEADOWS" A 0.02 0.99 1.000 30
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.98
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.505
SUBAREA AREA(ACRES) = 2.11 SUBAREA RUNOFF(CFS) = 2.92
EFFECTIVE AREA(ACRES) = 767.33 AREA-AVERAGED Fm(INCH/HR) = 0.36 AREA-AVERAGED Fp(INCH/HR) = 0.43 AREA-AVERAGED Ap = 0.83 TOTAL AREA(ACRES) = 772.2 PEAK FLOW RATE(CFS) = 1254.95 NOTE: PEAK FLOW RATE DEFAULTED TO UPSTREAM VALUE
**************************************************************************** FLOW PROCESS FROM NODE 114.00 TO NODE 114.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 1 <<<<< ============================================================================ Meyers Creek – Existing Condition 2024

Page 48 of 81 ends

**************************************************************************** FLOW PROCESS FROM NODE 1400.00 TO NODE 1401.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
>>USE TIME-OF-CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< ============================================================================ INITIAL SUBAREA FLOW-LENGTH(FEET) = 481.00
ELEVATION DATA: UPSTREAM(FEET) = 1842.00 DOWNSTREAM(FEET) = 1826.00 Tc = K*[(LENGTH** 3.00)/(ELEVATION CHANGE)]**0.20
SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = 7.101
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 4.001
SUBAREA Tc AND LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS Tc
LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN (MIN.)

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.55 0.98 0.500 32 9.09

RESIDENTIAL
"5-7 DWELLINGS/ACRE" B 0.05 0.75 0.500 56 9.09
COMMERCIAL A 0.08 0.98 0.100 32 7.10
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.96
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.451
SUBAREA RUNOFF(CFS) = 2.21
TOTAL AREA(ACRES) = 0.69 PEAK FLOW RATE(CFS) = 2.21
**************************************************************************** FLOW PROCESS FROM NODE 1401.00 TO NODE 1402.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1826.00 DOWNSTREAM(FEET) = 1803.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 714.00 CHANNEL SLOPE = 0.0322 CHANNEL FLOW THRU SUBAREA(CFS) = 2.21
FLOW VELOCITY(FEET/SEC) = 3.15 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 3.77 Tc(MIN.) = 10.87
LONGEST FLOWPATH FROM NODE 1400.00 TO NODE 1402.00 = 1195.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 1402.00 TO NODE 1402.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 10.87
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 3.303
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 1.31 0.98 0.500 32
Meyers Creek – Existing Condition 2024

Page 49 of 81 ends

SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.98
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA AREA(ACRES) = 1.31 SUBAREA RUNOFF(CFS) = 3.33
EFFECTIVE AREA(ACRES) = 2.00 AREA-AVERAGED Fm(INCH/HR) = 0.47 AREA-AVERAGED Fp(INCH/HR) = 0.97 AREA-AVERAGED Ap = 0.48 TOTAL AREA(ACRES) = 2.0 PEAK FLOW RATE(CFS) = 5.10
**************************************************************************** FLOW PROCESS FROM NODE 1402.00 TO NODE 1403.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1803.00 DOWNSTREAM(FEET) = 1798.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 177.00 CHANNEL SLOPE = 0.0282 CHANNEL FLOW THRU SUBAREA(CFS) = 5.10
FLOW VELOCITY(FEET/SEC) = 3.56 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.83 Tc(MIN.) = 11.70
LONGEST FLOWPATH FROM NODE 1400.00 TO NODE 1403.00 = 1372.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 1403.00 TO NODE 1403.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 11.70
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 3.150
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.79 0.98 0.500 32
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.98
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA AREA(ACRES) = 0.79 SUBAREA RUNOFF(CFS) = 1.89
EFFECTIVE AREA(ACRES) = 2.79 AREA-AVERAGED Fm(INCH/HR) = 0.47 AREA-AVERAGED Fp(INCH/HR) = 0.97 AREA-AVERAGED Ap = 0.49 TOTAL AREA(ACRES) = 2.8 PEAK FLOW RATE(CFS) = 6.72
**************************************************************************** FLOW PROCESS FROM NODE 1403.00 TO NODE 1403.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<<
============================================================================ TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE:

TIME OF CONCENTRATION(MIN.) = 11.70
RAINFALL INTENSITY(INCH/HR) = 3.15
AREA-AVERAGED Fm(INCH/HR) = 0.47
AREA-AVERAGED Fp(INCH/HR) = 0.97
Meyers Creek – Existing Condition 2024

Page 50 of 81 ends

AREA-AVERAGED Ap = 0.49
EFFECTIVE STREAM AREA(ACRES) = 2.79
TOTAL STREAM AREA(ACRES) = 2.79
PEAK FLOW RATE(CFS) AT CONFLUENCE = 6.72
**************************************************************************** FLOW PROCESS FROM NODE 1500.00 TO NODE 1501.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
>>USE TIME-OF-CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< ============================================================================ INITIAL SUBAREA FLOW-LENGTH(FEET) = 489.00
ELEVATION DATA: UPSTREAM(FEET) = 1827.00 DOWNSTREAM(FEET) = 1810.00 Tc = K*[(LENGTH** 3.00)/(ELEVATION CHANGE)]**0.20
SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = 9.067
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 3.638
SUBAREA Tc AND LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS Tc
LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN (MIN.)

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 1.38 0.98 0.500 32 9.07
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.98
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA RUNOFF(CFS) = 3.93
TOTAL AREA(ACRES) = 1.38 PEAK FLOW RATE(CFS) = 3.93
**************************************************************************** FLOW PROCESS FROM NODE 1501.00 TO NODE 1403.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1810.00 DOWNSTREAM(FEET) = 1798.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 501.00 CHANNEL SLOPE = 0.0240 CHANNEL FLOW THRU SUBAREA(CFS) = 3.93
FLOW VELOCITY(FEET/SEC) = 3.09 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 2.70 Tc(MIN.) = 11.77
LONGEST FLOWPATH FROM NODE 1500.00 TO NODE 1403.00 = 990.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 1403.00 TO NODE 1403.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 11.77
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 3.137
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN
Meyers Creek – Existing Condition 2024

Page 51 of 81 ends

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.68 0.98 0.500 32

NATURAL GOOD COVER
"MEADOWS" A 0.04 0.99 1.000 30
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.98
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.528
SUBAREA AREA(ACRES) = 0.72 SUBAREA RUNOFF(CFS) = 1.71
EFFECTIVE AREA(ACRES) = 2.11 AREA-AVERAGED Fm(INCH/HR) = 0.50 AREA-AVERAGED Fp(INCH/HR) = 0.98 AREA-AVERAGED Ap = 0.51 TOTAL AREA(ACRES) = 2.1 PEAK FLOW RATE(CFS) = 5.01
**************************************************************************** FLOW PROCESS FROM NODE 1403.00 TO NODE 1403.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<<
>>>>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<<<<< ============================================================================ TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE:

TIME OF CONCENTRATION(MIN.) = 11.77
RAINFALL INTENSITY(INCH/HR) = 3.14
AREA-AVERAGED Fm(INCH/HR) = 0.50
AREA-AVERAGED Fp(INCH/HR) = 0.98
AREA-AVERAGED Ap = 0.51
EFFECTIVE STREAM AREA(ACRES) = 2.11
TOTAL STREAM AREA(ACRES) = 2.11
PEAK FLOW RATE(CFS) AT CONFLUENCE = 5.01
** CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 6.72 11.70 3.150 0.97( 0.47) 0.49 2.8 1400.00
2 5.01 11.77 3.137 0.98( 0.50) 0.51 2.1 1500.00

RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO
CONFLUENCE FORMULA USED FOR 2 STREAMS.
** PEAK FLOW RATE TABLE **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 11.72 11.70 3.150 0.97( 0.48) 0.50 4.9 1400.00
2 11.70 11.77 3.137 0.97( 0.48) 0.50 4.9 1500.00
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 11.72 Tc(MIN.) = 11.70
EFFECTIVE AREA(ACRES) = 4.89 AREA-AVERAGED Fm(INCH/HR) = 0.48 AREA-AVERAGED Fp(INCH/HR) = 0.97 AREA-AVERAGED Ap = 0.50 TOTAL AREA(ACRES) = 4.9
LONGEST FLOWPATH FROM NODE 1400.00 TO NODE 1403.00 = 1372.00 FEET.

Meyers Creek – Existing Condition 2024

Page 52 of 81 ends

**************************************************************************** FLOW PROCESS FROM NODE 1403.00 TO NODE 114.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1798.00 DOWNSTREAM(FEET) = 1790.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 160.00 CHANNEL SLOPE = 0.0500 CHANNEL FLOW THRU SUBAREA(CFS) = 11.72
FLOW VELOCITY(FEET/SEC) = 5.82 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.46 Tc(MIN.) = 12.16
LONGEST FLOWPATH FROM NODE 1400.00 TO NODE 114.00 = 1532.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 114.00 TO NODE 114.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 12.16
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 3.065
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.17 0.98 0.500 32

NATURAL GOOD COVER
"MEADOWS" A 0.04 0.99 1.000 30
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.98
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.591
SUBAREA AREA(ACRES) = 0.21 SUBAREA RUNOFF(CFS) = 0.47
EFFECTIVE AREA(ACRES) = 5.09 AREA-AVERAGED Fm(INCH/HR) = 0.49 AREA-AVERAGED Fp(INCH/HR) = 0.97 AREA-AVERAGED Ap = 0.50 TOTAL AREA(ACRES) = 5.1 PEAK FLOW RATE(CFS) = 11.82
**************************************************************************** FLOW PROCESS FROM NODE 114.00 TO NODE 114.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 1 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 11.82 12.16 3.065 0.97( 0.49) 0.50 5.1 1400.00
2 11.79 12.23 3.052 0.97( 0.49) 0.50 5.1 1500.00
LONGEST FLOWPATH FROM NODE 1400.00 TO NODE 114.00 = 1532.00 FEET. ** MEMORY BANK # 1 CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
Meyers Creek – Existing Condition 2024

Page 53 of 81 ends

1 1088.46 12.06 3.084 0.44( 0.35) 0.81 370.1 1300.00
2 1088.84 12.08 3.081 0.44( 0.35) 0.81 370.6 700.00
3 1153.32 14.48 2.637 0.43( 0.35) 0.81 457.2 1100.00
4 1155.19 14.76 2.585 0.43( 0.35) 0.81 467.2 600.00
5 1155.59 14.80 2.577 0.43( 0.35) 0.81 468.8 200.00
6 1162.01 15.67 2.511 0.43( 0.35) 0.81 498.3 100.00
7 1174.26 17.49 2.432 0.43( 0.35) 0.82 557.3 1105.00
8 1174.55 19.78 2.333 0.43( 0.35) 0.82 610.5 500.00
9 1254.95 26.71 2.033 0.43( 0.36) 0.83 767.3 300.00
10 1253.10 27.04 2.018 0.43( 0.36) 0.83 772.2 400.00
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 114.00 = 6011.00 FEET. ** PEAK FLOW RATE TABLE **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 1100.26 12.06 3.084 0.44( 0.35) 0.80 375.2 1300.00
2 1100.64 12.08 3.081 0.44( 0.35) 0.80 375.7 700.00
3 1102.84 12.16 3.065 0.44( 0.35) 0.80 378.7 1400.00
4 1104.70 12.23 3.052 0.44( 0.35) 0.80 381.2 1500.00
5 1163.19 14.48 2.637 0.44( 0.35) 0.81 462.3 1100.00
6 1164.83 14.76 2.585 0.44( 0.35) 0.81 472.3 600.00
7 1165.19 14.80 2.577 0.44( 0.35) 0.81 473.9 200.00
8 1171.31 15.67 2.511 0.43( 0.35) 0.81 503.4 100.00
9 1183.20 17.49 2.432 0.43( 0.35) 0.82 562.4 1105.00
10 1183.03 19.78 2.333 0.43( 0.35) 0.82 615.6 500.00
11 1262.05 26.71 2.033 0.43( 0.36) 0.83 772.4 300.00
12 1260.13 27.04 2.018 0.43( 0.36) 0.83 777.3 400.00
TOTAL AREA(ACRES) = 777.3
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 1262.05 Tc(MIN.) = 26.711
EFFECTIVE AREA(ACRES) = 772.44 AREA-AVERAGED Fm(INCH/HR) = 0.36 AREA-AVERAGED Fp(INCH/HR) = 0.43 AREA-AVERAGED Ap = 0.83 TOTAL AREA(ACRES) = 777.3
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 114.00 = 6011.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 114.00 TO NODE 114.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 1 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 114.00 TO NODE 115.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1790.00 DOWNSTREAM(FEET) = 1780.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 418.00 CHANNEL SLOPE = 0.0239 Meyers Creek – Existing Condition 2024

Page 54 of 81 ends

CHANNEL FLOW THRU SUBAREA(CFS) = 1262.05
FLOW VELOCITY(FEET/SEC) = 16.36 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.43 Tc(MIN.) = 27.14
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 115.00 = 6429.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 115.00 TO NODE 115.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 27.14
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 2.014
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

NATURAL GOOD COVER
"MEADOWS" A 0.46 0.99 1.000 30
COMMERCIAL A 0.01 0.98 0.100 32
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.98
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.981
SUBAREA AREA(ACRES) = 0.47 SUBAREA RUNOFF(CFS) = 0.44
EFFECTIVE AREA(ACRES) = 772.90 AREA-AVERAGED Fm(INCH/HR) = 0.36 AREA-AVERAGED Fp(INCH/HR) = 0.43 AREA-AVERAGED Ap = 0.83 TOTAL AREA(ACRES) = 777.8 PEAK FLOW RATE(CFS) = 1262.05 NOTE: PEAK FLOW RATE DEFAULTED TO UPSTREAM VALUE
**************************************************************************** FLOW PROCESS FROM NODE 115.00 TO NODE 115.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<<
============================================================================ TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE:

TIME OF CONCENTRATION(MIN.) = 27.14
RAINFALL INTENSITY(INCH/HR) = 2.01
AREA-AVERAGED Fm(INCH/HR) = 0.36
AREA-AVERAGED Fp(INCH/HR) = 0.43
AREA-AVERAGED Ap = 0.83
EFFECTIVE STREAM AREA(ACRES) = 772.90
TOTAL STREAM AREA(ACRES) = 777.81
PEAK FLOW RATE(CFS) AT CONFLUENCE = 1262.05
**************************************************************************** FLOW PROCESS FROM NODE 1600.00 TO NODE 1601.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
>>USE TIME-OF-CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< ============================================================================ INITIAL SUBAREA FLOW-LENGTH(FEET) = 481.00
ELEVATION DATA: UPSTREAM(FEET) = 1836.00 DOWNSTREAM(FEET) = 1814.00 Meyers Creek – Existing Condition 2024

Page 55 of 81 ends

Tc = K*[(LENGTH** 3.00)/(ELEVATION CHANGE)]**0.20
SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = 8.526
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 3.738
SUBAREA Tc AND LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS Tc
LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN (MIN.)

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 1.07 0.98 0.500 32 8.53
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.98
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA RUNOFF(CFS) = 3.14
TOTAL AREA(ACRES) = 1.07 PEAK FLOW RATE(CFS) = 3.14
**************************************************************************** FLOW PROCESS FROM NODE 1601.00 TO NODE 1602.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1814.00 DOWNSTREAM(FEET) = 1800.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 415.00 CHANNEL SLOPE = 0.0337 CHANNEL FLOW THRU SUBAREA(CFS) = 3.14
FLOW VELOCITY(FEET/SEC) = 3.48 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 1.99 Tc(MIN.) = 10.51
LONGEST FLOWPATH FROM NODE 1600.00 TO NODE 1602.00 = 896.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 1602.00 TO NODE 1602.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 10.51
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 3.370
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 1.36 0.98 0.500 32
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.98
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA AREA(ACRES) = 1.36 SUBAREA RUNOFF(CFS) = 3.52
EFFECTIVE AREA(ACRES) = 2.43 AREA-AVERAGED Fm(INCH/HR) = 0.49 AREA-AVERAGED Fp(INCH/HR) = 0.98 AREA-AVERAGED Ap = 0.50 TOTAL AREA(ACRES) = 2.4 PEAK FLOW RATE(CFS) = 6.30
**************************************************************************** FLOW PROCESS FROM NODE 1602.00 TO NODE 115.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
Meyers Creek – Existing Condition 2024

Page 56 of 81 ends

>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1800.00 DOWNSTREAM(FEET) = 1780.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 629.00 CHANNEL SLOPE = 0.0318 CHANNEL FLOW THRU SUBAREA(CFS) = 6.30
FLOW VELOCITY(FEET/SEC) = 3.98 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 2.64 Tc(MIN.) = 13.15
LONGEST FLOWPATH FROM NODE 1600.00 TO NODE 115.00 = 1525.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 115.00 TO NODE 115.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 13.15
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 2.882
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 1.80 0.98 0.500 32

NATURAL GOOD COVER
"MEADOWS" A 0.60 0.99 1.000 30
COMMERCIAL A 0.03 0.98 0.100 32
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.98
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.620
SUBAREA AREA(ACRES) = 2.42 SUBAREA RUNOFF(CFS) = 4.96
EFFECTIVE AREA(ACRES) = 4.85 AREA-AVERAGED Fm(INCH/HR) = 0.55 AREA-AVERAGED Fp(INCH/HR) = 0.98 AREA-AVERAGED Ap = 0.56 TOTAL AREA(ACRES) = 4.9 PEAK FLOW RATE(CFS) = 10.20
**************************************************************************** FLOW PROCESS FROM NODE 115.00 TO NODE 115.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<<
>>>>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<<<<< ============================================================================ TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE:

TIME OF CONCENTRATION(MIN.) = 13.15
RAINFALL INTENSITY(INCH/HR) = 2.88
AREA-AVERAGED Fm(INCH/HR) = 0.55
AREA-AVERAGED Fp(INCH/HR) = 0.98
AREA-AVERAGED Ap = 0.56
EFFECTIVE STREAM AREA(ACRES) = 4.85
TOTAL STREAM AREA(ACRES) = 4.85
PEAK FLOW RATE(CFS) AT CONFLUENCE = 10.20
** CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
Meyers Creek – Existing Condition 2024

Page 57 of 81 ends

NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 1100.26 12.51 3.001 0.44( 0.35) 0.80 375.6 1300.00
1 1100.64 12.52 2.998 0.44( 0.35) 0.80 376.2 700.00
1 1102.84 12.60 2.983 0.44( 0.35) 0.80 379.1 1400.00
1 1104.70 12.67 2.970 0.44( 0.35) 0.80 381.7 1500.00
1 1163.19 14.92 2.556 0.44( 0.35) 0.81 462.8 1100.00
1 1164.83 15.19 2.532 0.44( 0.35) 0.81 472.8 600.00
1 1165.19 15.24 2.530 0.44( 0.35) 0.81 474.4 200.00
1 1171.31 16.11 2.492 0.43( 0.35) 0.81 503.9 100.00
1 1183.20 17.92 2.413 0.43( 0.35) 0.82 562.9 1105.00
1 1183.03 20.22 2.314 0.43( 0.35) 0.82 616.0 500.00
1 1262.05 27.14 2.014 0.43( 0.36) 0.83 772.9 300.00
1 1260.13 27.47 2.000 0.43( 0.36) 0.83 777.8 400.00
2 10.20 13.15 2.882 0.98( 0.55) 0.56 4.9 1600.00

RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO
CONFLUENCE FORMULA USED FOR 2 STREAMS.
** PEAK FLOW RATE TABLE **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 1110.46 12.51 3.001 0.45( 0.36) 0.80 380.3 1300.00
2 1110.84 12.52 2.998 0.45( 0.36) 0.80 380.8 700.00
3 1113.04 12.60 2.983 0.45( 0.36) 0.80 383.8 1400.00
4 1114.90 12.67 2.970 0.45( 0.36) 0.80 386.4 1500.00
5 1127.28 13.15 2.882 0.44( 0.36) 0.80 403.7 1600.00
6 1171.97 14.92 2.556 0.44( 0.35) 0.80 467.6 1100.00
7 1173.50 15.19 2.532 0.44( 0.35) 0.81 477.6 600.00
8 1173.86 15.24 2.530 0.44( 0.35) 0.81 479.2 200.00
9 1179.80 16.11 2.492 0.44( 0.35) 0.81 508.8 100.00
10 1191.35 17.92 2.413 0.43( 0.35) 0.81 567.7 1105.00
11 1190.74 20.22 2.314 0.43( 0.36) 0.82 620.9 500.00
12 1268.45 27.14 2.014 0.43( 0.36) 0.83 777.8 300.00
13 1266.48 27.47 2.000 0.43( 0.36) 0.83 782.7 400.00
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 1268.45 Tc(MIN.) = 27.14
EFFECTIVE AREA(ACRES) = 777.76 AREA-AVERAGED Fm(INCH/HR) = 0.36 AREA-AVERAGED Fp(INCH/HR) = 0.43 AREA-AVERAGED Ap = 0.83 TOTAL AREA(ACRES) = 782.7
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 115.00 = 6429.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 115.00 TO NODE 115.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 1 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 800.00 TO NODE 801.00 IS CODE = 21 Meyers Creek – Existing Condition 2024

Page 58 of 81 ends

---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
>>USE TIME-OF-CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< ============================================================================ INITIAL SUBAREA FLOW-LENGTH(FEET) = 294.00
ELEVATION DATA: UPSTREAM(FEET) = 1924.00 DOWNSTREAM(FEET) = 1887.00 Tc = K*[(LENGTH** 3.00)/(ELEVATION CHANGE)]**0.20
SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = 5.719
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 4.257
SUBAREA Tc AND LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS Tc
LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN (MIN.)

RESIDENTIAL
"5-7 DWELLINGS/ACRE" C 0.53 0.57 0.500 69 5.72
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.57
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA RUNOFF(CFS) = 1.91
TOTAL AREA(ACRES) = 0.53 PEAK FLOW RATE(CFS) = 1.91
**************************************************************************** FLOW PROCESS FROM NODE 801.00 TO NODE 802.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1887.00 DOWNSTREAM(FEET) = 1880.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 178.00 CHANNEL SLOPE = 0.0393 CHANNEL FLOW THRU SUBAREA(CFS) = 1.91
FLOW VELOCITY(FEET/SEC) = 3.38 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.88 Tc(MIN.) = 6.60
LONGEST FLOWPATH FROM NODE 800.00 TO NODE 802.00 = 472.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 802.00 TO NODE 802.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 6.60
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 4.095
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" C 0.94 0.57 0.500 69
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.57
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA AREA(ACRES) = 0.94 SUBAREA RUNOFF(CFS) = 3.23
EFFECTIVE AREA(ACRES) = 1.47 AREA-AVERAGED Fm(INCH/HR) = 0.28 AREA-AVERAGED Fp(INCH/HR) = 0.57 AREA-AVERAGED Ap = 0.50 Meyers Creek – Existing Condition 2024

Page 59 of 81 ends

TOTAL AREA(ACRES) = 1.5 PEAK FLOW RATE(CFS) = 5.06
**************************************************************************** FLOW PROCESS FROM NODE 802.00 TO NODE 803.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1880.00 DOWNSTREAM(FEET) = 1858.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 428.00 CHANNEL SLOPE = 0.0514 CHANNEL FLOW THRU SUBAREA(CFS) = 5.06
FLOW VELOCITY(FEET/SEC) = 4.80 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 1.49 Tc(MIN.) = 8.08
LONGEST FLOWPATH FROM NODE 800.00 TO NODE 803.00 = 900.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 803.00 TO NODE 803.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 8.08
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 3.819
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.79 0.98 0.500 32
APARTMENTS C 0.92 0.57 0.200 69
COMMERCIAL A 0.02 0.98 0.100 32
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.85
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.336
SUBAREA AREA(ACRES) = 1.73 SUBAREA RUNOFF(CFS) = 5.50
EFFECTIVE AREA(ACRES) = 3.20 AREA-AVERAGED Fm(INCH/HR) = 0.28 AREA-AVERAGED Fp(INCH/HR) = 0.69 AREA-AVERAGED Ap = 0.41 TOTAL AREA(ACRES) = 3.2 PEAK FLOW RATE(CFS) = 10.19
**************************************************************************** FLOW PROCESS FROM NODE 803.00 TO NODE 804.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 3 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0050
STREET LENGTH(FEET) = 189.00 CURB HEIGHT(INCHES) = 8.0
STREET HALFWIDTH(FEET) = 25.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 20.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
Meyers Creek – Existing Condition 2024

Page 60 of 81 ends

SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 12.14 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.59
HALFSTREET FLOOD WIDTH(FEET) = 21.45
AVERAGE FLOW VELOCITY(FEET/SEC.) = 2.53
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 1.49
STREET FLOW TRAVEL TIME(MIN.) = 1.24 Tc(MIN.) = 9.33
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 3.590
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.98 0.98 0.500 32
COMMERCIAL A 0.37 0.98 0.100 32
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.98
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.391
SUBAREA AREA(ACRES) = 1.35 SUBAREA RUNOFF(CFS) = 3.89
EFFECTIVE AREA(ACRES) = 4.55 AREA-AVERAGED Fm(INCH/HR) = 0.31 AREA-AVERAGED Fp(INCH/HR) = 0.77 AREA-AVERAGED Ap = 0.41 TOTAL AREA(ACRES) = 4.6 PEAK FLOW RATE(CFS) = 13.42
END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.60 HALFSTREET FLOOD WIDTH(FEET) = 22.30 FLOW VELOCITY(FEET/SEC.) = 2.60 DEPTH*VELOCITY(FT*FT/SEC.) = 1.57 LONGEST FLOWPATH FROM NODE 800.00 TO NODE 804.00 = 1089.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 804.00 TO NODE 805.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 5 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0370
STREET LENGTH(FEET) = 695.00 CURB HEIGHT(INCHES) = 8.0
STREET HALFWIDTH(FEET) = 22.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 17.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 Meyers Creek – Existing Condition 2024

Page 61 of 81 ends

**TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 16.00 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.48
HALFSTREET FLOOD WIDTH(FEET) = 16.06
AVERAGE FLOW VELOCITY(FEET/SEC.) = 5.78
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 2.77
STREET FLOW TRAVEL TIME(MIN.) = 2.00 Tc(MIN.) = 11.33
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 3.219
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 1.10 0.98 0.500 32
COMMERCIAL A 0.88 0.98 0.100 32
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.98
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.322
SUBAREA AREA(ACRES) = 1.97 SUBAREA RUNOFF(CFS) = 5.16
EFFECTIVE AREA(ACRES) = 6.52 AREA-AVERAGED Fm(INCH/HR) = 0.31 AREA-AVERAGED Fp(INCH/HR) = 0.82 AREA-AVERAGED Ap = 0.38 TOTAL AREA(ACRES) = 6.5 PEAK FLOW RATE(CFS) = 17.06
END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.49 HALFSTREET FLOOD WIDTH(FEET) = 16.46 FLOW VELOCITY(FEET/SEC.) = 5.89 DEPTH*VELOCITY(FT*FT/SEC.) = 2.87 LONGEST FLOWPATH FROM NODE 800.00 TO NODE 805.00 = 1784.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 805.00 TO NODE 805.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 2 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 900.00 TO NODE 901.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
>>USE TIME-OF-CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< ============================================================================ INITIAL SUBAREA FLOW-LENGTH(FEET) = 284.00
ELEVATION DATA: UPSTREAM(FEET) = 1863.00 DOWNSTREAM(FEET) = 1851.00 Tc = K*[(LENGTH** 3.00)/(ELEVATION CHANGE)]**0.20
SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = 5.483
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 4.301
SUBAREA Tc AND LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS Tc
LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN (MIN.)

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.43 0.98 0.500 32 7.02
COMMERCIAL A 0.01 0.98 0.100 32 5.48
Meyers Creek – Existing Condition 2024

Page 62 of 81 ends

SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.97
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.491
SUBAREA RUNOFF(CFS) = 1.50
TOTAL AREA(ACRES) = 0.44 PEAK FLOW RATE(CFS) = 1.50
**************************************************************************** FLOW PROCESS FROM NODE 901.00 TO NODE 902.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1851.00 DOWNSTREAM(FEET) = 1843.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 194.00 CHANNEL SLOPE = 0.0412 CHANNEL FLOW THRU SUBAREA(CFS) = 1.50
FLOW VELOCITY(FEET/SEC) = 3.29 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.98 Tc(MIN.) = 6.46
LONGEST FLOWPATH FROM NODE 900.00 TO NODE 902.00 = 478.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 902.00 TO NODE 902.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 6.46
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 4.119
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.64 0.98 0.500 32
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.98
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA AREA(ACRES) = 0.64 SUBAREA RUNOFF(CFS) = 2.09
EFFECTIVE AREA(ACRES) = 1.07 AREA-AVERAGED Fm(INCH/HR) = 0.48 AREA-AVERAGED Fp(INCH/HR) = 0.98 AREA-AVERAGED Ap = 0.50 TOTAL AREA(ACRES) = 1.1 PEAK FLOW RATE(CFS) = 3.51
**************************************************************************** FLOW PROCESS FROM NODE 902.00 TO NODE 903.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1843.00 DOWNSTREAM(FEET) = 1838.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 128.00 CHANNEL SLOPE = 0.0391 CHANNEL FLOW THRU SUBAREA(CFS) = 3.51
FLOW VELOCITY(FEET/SEC) = 3.84 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.55 Tc(MIN.) = 7.02
LONGEST FLOWPATH FROM NODE 900.00 TO NODE 903.00 = 606.00 FEET.

Meyers Creek – Existing Condition 2024

Page 63 of 81 ends

**************************************************************************** FLOW PROCESS FROM NODE 903.00 TO NODE 903.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 7.02
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 4.016
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.74 0.98 0.500 32
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.98
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA AREA(ACRES) = 0.74 SUBAREA RUNOFF(CFS) = 2.35
EFFECTIVE AREA(ACRES) = 1.81 AREA-AVERAGED Fm(INCH/HR) = 0.49 AREA-AVERAGED Fp(INCH/HR) = 0.98 AREA-AVERAGED Ap = 0.50 TOTAL AREA(ACRES) = 1.8 PEAK FLOW RATE(CFS) = 5.76
**************************************************************************** FLOW PROCESS FROM NODE 903.00 TO NODE 904.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1838.00 DOWNSTREAM(FEET) = 1834.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 173.00 CHANNEL SLOPE = 0.0231 CHANNEL FLOW THRU SUBAREA(CFS) = 5.76
FLOW VELOCITY(FEET/SEC) = 3.32 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.87 Tc(MIN.) = 7.89
LONGEST FLOWPATH FROM NODE 900.00 TO NODE 904.00 = 779.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 904.00 TO NODE 904.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 7.89
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 3.856
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 1.31 0.98 0.500 32
COMMERCIAL A 0.06 0.98 0.100 32
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.98
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.481
SUBAREA AREA(ACRES) = 1.37 SUBAREA RUNOFF(CFS) = 4.18
EFFECTIVE AREA(ACRES) = 3.19 AREA-AVERAGED Fm(INCH/HR) = 0.48 AREA-AVERAGED Fp(INCH/HR) = 0.98 AREA-AVERAGED Ap = 0.49 Meyers Creek – Existing Condition 2024

Page 64 of 81 ends

TOTAL AREA(ACRES) = 3.2 PEAK FLOW RATE(CFS) = 9.69
**************************************************************************** FLOW PROCESS FROM NODE 904.00 TO NODE 905.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1834.00 DOWNSTREAM(FEET) = 1832.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 63.00 CHANNEL SLOPE = 0.0317 CHANNEL FLOW THRU SUBAREA(CFS) = 9.69
FLOW VELOCITY(FEET/SEC) = 4.42 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.24 Tc(MIN.) = 8.13
LONGEST FLOWPATH FROM NODE 900.00 TO NODE 905.00 = 842.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 905.00 TO NODE 905.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 8.13
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 3.812
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.61 0.98 0.500 32
COMMERCIAL A 0.24 0.98 0.100 32
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.98
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.386
SUBAREA AREA(ACRES) = 0.85 SUBAREA RUNOFF(CFS) = 2.62
EFFECTIVE AREA(ACRES) = 4.03 AREA-AVERAGED Fm(INCH/HR) = 0.46 AREA-AVERAGED Fp(INCH/HR) = 0.98 AREA-AVERAGED Ap = 0.47 TOTAL AREA(ACRES) = 4.0 PEAK FLOW RATE(CFS) = 12.18
**************************************************************************** FLOW PROCESS FROM NODE 905.00 TO NODE 905.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<<
============================================================================ TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE:

TIME OF CONCENTRATION(MIN.) = 8.13
RAINFALL INTENSITY(INCH/HR) = 3.81
AREA-AVERAGED Fm(INCH/HR) = 0.46
AREA-AVERAGED Fp(INCH/HR) = 0.98
AREA-AVERAGED Ap = 0.47
EFFECTIVE STREAM AREA(ACRES) = 4.03
TOTAL STREAM AREA(ACRES) = 4.03
PEAK FLOW RATE(CFS) AT CONFLUENCE = 12.18
Meyers Creek – Existing Condition 2024

Page 65 of 81 ends

**************************************************************************** FLOW PROCESS FROM NODE 1000.00 TO NODE 1001.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
>>USE TIME-OF-CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< ============================================================================ INITIAL SUBAREA FLOW-LENGTH(FEET) = 298.00
ELEVATION DATA: UPSTREAM(FEET) = 1859.00 DOWNSTREAM(FEET) = 1844.00 Tc = K*[(LENGTH** 3.00)/(ELEVATION CHANGE)]**0.20
SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = 6.907
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 4.037
SUBAREA Tc AND LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS Tc
LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN (MIN.)

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.86 0.98 0.500 32 6.91
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.98
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA RUNOFF(CFS) = 2.74
TOTAL AREA(ACRES) = 0.86 PEAK FLOW RATE(CFS) = 2.74
**************************************************************************** FLOW PROCESS FROM NODE 1001.00 TO NODE 905.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1844.00 DOWNSTREAM(FEET) = 1832.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 375.00 CHANNEL SLOPE = 0.0320 CHANNEL FLOW THRU SUBAREA(CFS) = 2.74
FLOW VELOCITY(FEET/SEC) = 3.29 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 1.90 Tc(MIN.) = 8.80
LONGEST FLOWPATH FROM NODE 1000.00 TO NODE 905.00 = 673.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 905.00 TO NODE 905.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 8.80
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 3.686
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 1.09 0.98 0.500 32
COMMERCIAL A 0.01 0.98 0.100 32
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.98
Meyers Creek – Existing Condition 2024

Page 66 of 81 ends

SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.495
SUBAREA AREA(ACRES) = 1.11 SUBAREA RUNOFF(CFS) = 3.19
EFFECTIVE AREA(ACRES) = 1.97 AREA-AVERAGED Fm(INCH/HR) = 0.48 AREA-AVERAGED Fp(INCH/HR) = 0.98 AREA-AVERAGED Ap = 0.50 TOTAL AREA(ACRES) = 2.0 PEAK FLOW RATE(CFS) = 5.66
**************************************************************************** FLOW PROCESS FROM NODE 905.00 TO NODE 905.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<<
>>>>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<<<<< ============================================================================ TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE:

TIME OF CONCENTRATION(MIN.) = 8.80
RAINFALL INTENSITY(INCH/HR) = 3.69
AREA-AVERAGED Fm(INCH/HR) = 0.48
AREA-AVERAGED Fp(INCH/HR) = 0.98
AREA-AVERAGED Ap = 0.50
EFFECTIVE STREAM AREA(ACRES) = 1.97
TOTAL STREAM AREA(ACRES) = 1.97
PEAK FLOW RATE(CFS) AT CONFLUENCE = 5.66
** CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 12.18 8.13 3.812 0.98( 0.46) 0.47 4.0 900.00
2 5.66 8.80 3.686 0.98( 0.48) 0.50 2.0 1000.00

RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO
CONFLUENCE FORMULA USED FOR 2 STREAMS.
** PEAK FLOW RATE TABLE **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 17.61 8.13 3.812 0.98( 0.47) 0.48 5.8 900.00
2 17.39 8.80 3.686 0.98( 0.47) 0.48 6.0 1000.00
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 17.61 Tc(MIN.) = 8.13
EFFECTIVE AREA(ACRES) = 5.85 AREA-AVERAGED Fm(INCH/HR) = 0.47 AREA-AVERAGED Fp(INCH/HR) = 0.98 AREA-AVERAGED Ap = 0.48 TOTAL AREA(ACRES) = 6.0
LONGEST FLOWPATH FROM NODE 900.00 TO NODE 905.00 = 842.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 905.00 TO NODE 805.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 2 USED)<<<<<
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============================================================================ REPRESENTATIVE SLOPE = 0.0100
STREET LENGTH(FEET) = 172.00 CURB HEIGHT(INCHES) = 6.0
STREET HALFWIDTH(FEET) = 18.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 13.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 2
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 17.63 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.46
HALFSTREET FLOOD WIDTH(FEET) = 16.71
AVERAGE FLOW VELOCITY(FEET/SEC.) = 3.03
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 1.40
STREET FLOW TRAVEL TIME(MIN.) = 0.95 Tc(MIN.) = 9.07
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 3.637
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN
COMMERCIAL A 0.01 0.98 0.100 32
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.97
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.100
SUBAREA AREA(ACRES) = 0.01 SUBAREA RUNOFF(CFS) = 0.03
EFFECTIVE AREA(ACRES) = 5.86 AREA-AVERAGED Fm(INCH/HR) = 0.47 AREA-AVERAGED Fp(INCH/HR) = 0.98 AREA-AVERAGED Ap = 0.48 TOTAL AREA(ACRES) = 6.0 PEAK FLOW RATE(CFS) = 17.61
NOTE: PEAK FLOW RATE DEFAULTED TO UPSTREAM VALUE
END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.46 HALFSTREET FLOOD WIDTH(FEET) = 16.71 FLOW VELOCITY(FEET/SEC.) = 3.03 DEPTH*VELOCITY(FT*FT/SEC.) = 1.39 LONGEST FLOWPATH FROM NODE 900.00 TO NODE 805.00 = 1014.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 805.00 TO NODE 805.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 2 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 17.61 9.07 3.637 0.98( 0.47) 0.48 5.9 900.00
2 17.39 9.75 3.511 0.98( 0.47) 0.48 6.0 1000.00
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LONGEST FLOWPATH FROM NODE 900.00 TO NODE 805.00 = 1014.00 FEET. ** MEMORY BANK # 2 CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 17.06 11.33 3.219 0.82( 0.31) 0.38 6.5 800.00
LONGEST FLOWPATH FROM NODE 800.00 TO NODE 805.00 = 1784.00 FEET. ** PEAK FLOW RATE TABLE **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 33.24 9.07 3.637 0.91( 0.39) 0.43 11.1 900.00
2 33.55 9.75 3.511 0.91( 0.39) 0.43 11.6 1000.00
3 32.78 11.33 3.219 0.90( 0.39) 0.43 12.5 800.00
TOTAL AREA(ACRES) = 12.5
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 33.55 Tc(MIN.) = 9.751
EFFECTIVE AREA(ACRES) = 11.62 AREA-AVERAGED Fm(INCH/HR) = 0.39 AREA-AVERAGED Fp(INCH/HR) = 0.91 AREA-AVERAGED Ap = 0.43 TOTAL AREA(ACRES) = 12.5
LONGEST FLOWPATH FROM NODE 800.00 TO NODE 805.00 = 1784.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 805.00 TO NODE 805.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 2 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 805.00 TO NODE 806.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 3 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0370
STREET LENGTH(FEET) = 300.00 CURB HEIGHT(INCHES) = 8.0
STREET HALFWIDTH(FEET) = 25.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 20.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 36.73 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

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STREET FLOW DEPTH(FEET) = 0.61
HALFSTREET FLOOD WIDTH(FEET) = 22.38
AVERAGE FLOW VELOCITY(FEET/SEC.) = 7.06
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 4.28
STREET FLOW TRAVEL TIME(MIN.) = 0.71 Tc(MIN.) = 10.46
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 3.380
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 1.91 0.98 0.500 32
COMMERCIAL A 0.47 0.98 0.100 32
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.97
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.421
SUBAREA AREA(ACRES) = 2.38 SUBAREA RUNOFF(CFS) = 6.37
EFFECTIVE AREA(ACRES) = 14.01 AREA-AVERAGED Fm(INCH/HR) = 0.40 AREA-AVERAGED Fp(INCH/HR) = 0.92 AREA-AVERAGED Ap = 0.43 TOTAL AREA(ACRES) = 14.9 PEAK FLOW RATE(CFS) = 37.63
END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.61 HALFSTREET FLOOD WIDTH(FEET) = 22.62 FLOW VELOCITY(FEET/SEC.) = 7.09 DEPTH*VELOCITY(FT*FT/SEC.) = 4.33 ** PEAK FLOW RATE TABLE **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 37.69 9.78 3.506 0.92( 0.40) 0.43 13.5 900.00
2 37.63 10.46 3.380 0.92( 0.40) 0.43 14.0 1000.00
3 36.20 12.04 3.087 0.92( 0.39) 0.43 14.9 800.00
NEW PEAK FLOW DATA ARE:

PEAK FLOW RATE(CFS) = 37.69 Tc(MIN.) = 9.78
AREA-AVERAGED Fm(INCH/HR) = 0.40 AREA-AVERAGED Fp(INCH/HR) = 0.92 AREA-AVERAGED Ap = 0.43 EFFECTIVE AREA(ACRES) = 13.47
LONGEST FLOWPATH FROM NODE 800.00 TO NODE 806.00 = 2084.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 806.00 TO NODE 807.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 6 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0330
STREET LENGTH(FEET) = 273.00 CURB HEIGHT(INCHES) = 8.0
STREET HALFWIDTH(FEET) = 19.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 14.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
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STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 40.18 ***STREET FLOW SPLITS OVER STREET-CROWN***
FULL DEPTH(FEET) = 0.54 FLOOD WIDTH(FEET) = 19.00
FULL HALF-STREET VELOCITY(FEET/SEC.) = 6.03
SPLIT DEPTH(FEET) = 0.50 SPLIT FLOOD WIDTH(FEET) = 16.95 SPLIT FLOW(CFS) = 17.26 SPLIT VELOCITY(FEET/SEC.) = 5.64 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.54
HALFSTREET FLOOD WIDTH(FEET) = 19.00
AVERAGE FLOW VELOCITY(FEET/SEC.) = 6.03
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 3.25
STREET FLOW TRAVEL TIME(MIN.) = 0.75 Tc(MIN.) = 10.53
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 3.366
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 1.72 0.98 0.500 32
COMMERCIAL A 0.18 0.98 0.100 32
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.97
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.462
SUBAREA AREA(ACRES) = 1.90 SUBAREA RUNOFF(CFS) = 4.98
EFFECTIVE AREA(ACRES) = 15.36 AREA-AVERAGED Fm(INCH/HR) = 0.40 AREA-AVERAGED Fp(INCH/HR) = 0.93 AREA-AVERAGED Ap = 0.43 TOTAL AREA(ACRES) = 16.8 PEAK FLOW RATE(CFS) = 40.97
END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.54 HALFSTREET FLOOD WIDTH(FEET) = 19.00 FLOW VELOCITY(FEET/SEC.) = 6.03 DEPTH*VELOCITY(FT*FT/SEC.) = 3.25 LONGEST FLOWPATH FROM NODE 800.00 TO NODE 807.00 = 2357.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 807.00 TO NODE 808.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 3 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0260
STREET LENGTH(FEET) = 804.00 CURB HEIGHT(INCHES) = 8.0
STREET HALFWIDTH(FEET) = 25.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 20.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
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STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 44.25 ***STREET FLOW SPLITS OVER STREET-CROWN***
FULL DEPTH(FEET) = 0.66 FLOOD WIDTH(FEET) = 25.00
FULL HALF-STREET VELOCITY(FEET/SEC.) = 6.35
SPLIT DEPTH(FEET) = 0.33 SPLIT FLOOD WIDTH(FEET) = 8.71 SPLIT FLOW(CFS) = 3.37 SPLIT VELOCITY(FEET/SEC.) = 3.55 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.66
HALFSTREET FLOOD WIDTH(FEET) = 25.00
AVERAGE FLOW VELOCITY(FEET/SEC.) = 6.35
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 4.18
STREET FLOW TRAVEL TIME(MIN.) = 2.11 Tc(MIN.) = 12.64
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 2.976
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 2.32 0.98 0.500 32
COMMERCIAL A 0.52 0.98 0.100 32
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.97
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.427
SUBAREA AREA(ACRES) = 2.84 SUBAREA RUNOFF(CFS) = 6.55
EFFECTIVE AREA(ACRES) = 18.21 AREA-AVERAGED Fm(INCH/HR) = 0.41 AREA-AVERAGED Fp(INCH/HR) = 0.94 AREA-AVERAGED Ap = 0.43 TOTAL AREA(ACRES) = 19.7 PEAK FLOW RATE(CFS) = 42.12
END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.66 HALFSTREET FLOOD WIDTH(FEET) = 25.00 FLOW VELOCITY(FEET/SEC.) = 6.35 DEPTH*VELOCITY(FT*FT/SEC.) = 4.18 LONGEST FLOWPATH FROM NODE 800.00 TO NODE 808.00 = 3161.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 808.00 TO NODE 115.00 IS CODE = 31 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING COMPUTER-ESTIMATED PIPESIZE (NON-PRESSURE FLOW)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0420
FLOW LENGTH(FEET) = 45.00 MANNING'S N = 0.013
DEPTH OF FLOW IN 24.0 INCH PIPE IS 18.8 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 15.94
ESTIMATED PIPE DIAMETER(INCH) = 24.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 42.12
PIPE TRAVEL TIME(MIN.) = 0.05 Tc(MIN.) = 12.69
LONGEST FLOWPATH FROM NODE 800.00 TO NODE 115.00 = 3206.00 FEET.

Meyers Creek – Existing Condition 2024

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**************************************************************************** FLOW PROCESS FROM NODE 115.00 TO NODE 115.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 1 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 42.12 12.69 2.967 0.94( 0.41) 0.43 18.2 900.00
2 41.28 13.37 2.841 0.93( 0.40) 0.43 18.7 1000.00
3 38.59 14.96 2.548 0.93( 0.40) 0.43 19.7 800.00
LONGEST FLOWPATH FROM NODE 800.00 TO NODE 115.00 = 3206.00 FEET. ** MEMORY BANK # 1 CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 1110.46 12.51 3.001 0.45( 0.36) 0.80 380.3 1300.00
2 1110.84 12.52 2.998 0.45( 0.36) 0.80 380.8 700.00
3 1113.04 12.60 2.983 0.45( 0.36) 0.80 383.8 1400.00
4 1114.90 12.67 2.970 0.45( 0.36) 0.80 386.4 1500.00
5 1127.28 13.15 2.882 0.44( 0.36) 0.80 403.7 1600.00
6 1171.97 14.92 2.556 0.44( 0.35) 0.80 467.6 1100.00
7 1173.50 15.19 2.532 0.44( 0.35) 0.81 477.6 600.00
8 1173.86 15.24 2.530 0.44( 0.35) 0.81 479.2 200.00
9 1179.80 16.11 2.492 0.44( 0.35) 0.81 508.8 100.00
10 1191.35 17.92 2.413 0.43( 0.35) 0.81 567.7 1105.00
11 1190.74 20.22 2.314 0.43( 0.36) 0.82 620.9 500.00
12 1268.45 27.14 2.014 0.43( 0.36) 0.83 777.8 300.00
13 1266.48 27.47 2.000 0.43( 0.36) 0.83 782.7 400.00
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 115.00 = 6429.00 FEET. ** PEAK FLOW RATE TABLE **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 1152.53 12.51 3.001 0.46( 0.36) 0.78 398.2 1300.00
2 1152.91 12.52 2.998 0.46( 0.36) 0.78 398.8 700.00
3 1155.14 12.60 2.983 0.46( 0.36) 0.78 401.9 1400.00
4 1157.02 12.67 2.970 0.46( 0.36) 0.78 404.5 1500.00
5 1157.45 12.69 2.967 0.46( 0.36) 0.78 405.2 900.00
6 1168.84 13.15 2.882 0.46( 0.36) 0.79 422.3 1600.00
7 1174.18 13.37 2.841 0.46( 0.36) 0.79 430.5 1000.00
8 1210.63 14.92 2.556 0.45( 0.36) 0.79 487.3 1100.00
9 1210.80 14.96 2.548 0.45( 0.36) 0.79 488.8 800.00
10 1211.80 15.19 2.532 0.45( 0.36) 0.79 497.3 600.00
11 1212.12 15.24 2.530 0.45( 0.36) 0.79 498.9 200.00
12 1217.39 16.11 2.492 0.45( 0.36) 0.79 528.4 100.00
13 1227.53 17.92 2.413 0.44( 0.35) 0.80 587.4 1105.00
14 1225.13 20.22 2.314 0.44( 0.36) 0.81 640.6 500.00
15 1297.46 27.14 2.014 0.44( 0.36) 0.82 797.4 300.00
Meyers Creek – Existing Condition 2024

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16 1295.22 27.47 2.000 0.44( 0.36) 0.82 802.3 400.00
TOTAL AREA(ACRES) = 802.3
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 1297.46 Tc(MIN.) = 27.137
EFFECTIVE AREA(ACRES) = 797.42 AREA-AVERAGED Fm(INCH/HR) = 0.36 AREA-AVERAGED Fp(INCH/HR) = 0.44 AREA-AVERAGED Ap = 0.82 TOTAL AREA(ACRES) = 802.3
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 115.00 = 6429.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 115.00 TO NODE 115.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 1 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 115.00 TO NODE 116.00 IS CODE = 37 ---------------------------------------------------------------------------- >>>>>COMPUTE CULVERT TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING COMPUTER-ESTIMATED CULVERT SIZE<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 44.00 MANNING'S N = 0.014
Notes:

1. Reference: "Hydraulic Charts for the Selection of
Highway Culverts", Hydraulic Engineering Circular No. 5, December 1965, Federal Highway Administration.

2. INLET control for all Culvert Analysis.

3. Headwater depth is ASSUMED to be 3 FEET above the culvert soffit.

GIVEN BOX CULVERT HEIGHT(FEET) = 12.00
ESTIMATED BOX CULVERT BASEWIDTH(FEET) = 8.11
CULVERT-FLOW VELOCITY(FEET/SEC.) = 13.33
CULVERT-FLOW(CFS) = 1297.46
CULVERT-FLOW TRAVEL TIME(MIN.) = 0.05 Tc(MIN.) = 27.19
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 116.00 = 6473.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 116.00 TO NODE 116.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<<
============================================================================ TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE:

TIME OF CONCENTRATION(MIN.) = 27.19
RAINFALL INTENSITY(INCH/HR) = 2.01
AREA-AVERAGED Fm(INCH/HR) = 0.36
AREA-AVERAGED Fp(INCH/HR) = 0.44
AREA-AVERAGED Ap = 0.82
EFFECTIVE STREAM AREA(ACRES) = 797.42
Meyers Creek – Existing Condition 2024

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TOTAL STREAM AREA(ACRES) = 802.32
PEAK FLOW RATE(CFS) AT CONFLUENCE = 1297.46
**************************************************************************** FLOW PROCESS FROM NODE 1200.00 TO NODE 1201.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
>>USE TIME-OF-CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< ============================================================================ INITIAL SUBAREA FLOW-LENGTH(FEET) = 287.00
ELEVATION DATA: UPSTREAM(FEET) = 1858.00 DOWNSTREAM(FEET) = 1252.00 Tc = K*[(LENGTH** 3.00)/(ELEVATION CHANGE)]**0.20
SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = 5.000
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 4.390
SUBAREA Tc AND LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS Tc
LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN (MIN.)
SCHOOL A 0.68 0.98 0.600 32 5.00
COMMERCIAL A 0.03 0.98 0.100 32 5.00
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.98
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.582
SUBAREA RUNOFF(CFS) = 2.42
TOTAL AREA(ACRES) = 0.70 PEAK FLOW RATE(CFS) = 2.42
**************************************************************************** FLOW PROCESS FROM NODE 1201.00 TO NODE 1202.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 3 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0440
STREET LENGTH(FEET) = 160.00 CURB HEIGHT(INCHES) = 8.0
STREET HALFWIDTH(FEET) = 25.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 20.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 4.12 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.33
HALFSTREET FLOOD WIDTH(FEET) = 8.48
AVERAGE FLOW VELOCITY(FEET/SEC.) = 4.54
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 1.49
Meyers Creek – Existing Condition 2024

Page 75 of 81 ends

STREET FLOW TRAVEL TIME(MIN.) = 0.59 Tc(MIN.) = 5.59
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 4.281
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN
SCHOOL A 0.57 0.98 0.600 32
COMMERCIAL A 0.39 0.98 0.100 32
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.97
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.396
SUBAREA AREA(ACRES) = 0.97 SUBAREA RUNOFF(CFS) = 3.39
EFFECTIVE AREA(ACRES) = 1.67 AREA-AVERAGED Fm(INCH/HR) = 0.46 AREA-AVERAGED Fp(INCH/HR) = 0.98 AREA-AVERAGED Ap = 0.47 TOTAL AREA(ACRES) = 1.7 PEAK FLOW RATE(CFS) = 5.75
END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.36 HALFSTREET FLOOD WIDTH(FEET) = 9.96
FLOW VELOCITY(FEET/SEC.) = 4.86 DEPTH*VELOCITY(FT*FT/SEC.) = 1.74 LONGEST FLOWPATH FROM NODE 1200.00 TO NODE 1202.00 = 447.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 1202.00 TO NODE 1203.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 3 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0380
STREET LENGTH(FEET) = 210.00 CURB HEIGHT(INCHES) = 8.0
STREET HALFWIDTH(FEET) = 25.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 20.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 8.59 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.40
HALFSTREET FLOOD WIDTH(FEET) = 12.30
AVERAGE FLOW VELOCITY(FEET/SEC.) = 5.04
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 2.04
STREET FLOW TRAVEL TIME(MIN.) = 0.69 Tc(MIN.) = 6.28
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 4.153
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN
SCHOOL A 1.54 0.98 0.600 32
Meyers Creek – Existing Condition 2024

Page 76 of 81 ends

COMMERCIAL A 0.20 0.98 0.100 32
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.98
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.543
SUBAREA AREA(ACRES) = 1.74 SUBAREA RUNOFF(CFS) = 5.68
EFFECTIVE AREA(ACRES) = 3.41 AREA-AVERAGED Fm(INCH/HR) = 0.50 AREA-AVERAGED Fp(INCH/HR) = 0.98 AREA-AVERAGED Ap = 0.51 TOTAL AREA(ACRES) = 3.4 PEAK FLOW RATE(CFS) = 11.23
END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.43 HALFSTREET FLOOD WIDTH(FEET) = 13.79 FLOW VELOCITY(FEET/SEC.) = 5.37 DEPTH*VELOCITY(FT*FT/SEC.) = 2.33 LONGEST FLOWPATH FROM NODE 1200.00 TO NODE 1203.00 = 657.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 1203.00 TO NODE 1204.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 4 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0350
STREET LENGTH(FEET) = 594.00 CURB HEIGHT(INCHES) = 8.0
STREET HALFWIDTH(FEET) = 30.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 25.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 15.78 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.48
HALFSTREET FLOOD WIDTH(FEET) = 16.18
AVERAGE FLOW VELOCITY(FEET/SEC.) = 5.62
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 2.71
STREET FLOW TRAVEL TIME(MIN.) = 1.76 Tc(MIN.) = 8.04
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 3.827
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN
SCHOOL A 1.08 0.98 0.600 32
PUBLIC PARK A 1.10 0.98 0.850 32
COMMERCIAL A 0.89 0.98 0.100 32
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.98
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.546
SUBAREA AREA(ACRES) = 3.07 SUBAREA RUNOFF(CFS) = 9.09
EFFECTIVE AREA(ACRES) = 6.48 AREA-AVERAGED Fm(INCH/HR) = 0.51 Meyers Creek – Existing Condition 2024

Page 77 of 81 ends

AREA-AVERAGED Fp(INCH/HR) = 0.98 AREA-AVERAGED Ap = 0.53 TOTAL AREA(ACRES) = 6.5 PEAK FLOW RATE(CFS) = 19.32
END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.51 HALFSTREET FLOOD WIDTH(FEET) = 17.55 FLOW VELOCITY(FEET/SEC.) = 5.91 DEPTH*VELOCITY(FT*FT/SEC.) = 3.01 LONGEST FLOWPATH FROM NODE 1200.00 TO NODE 1204.00 = 1251.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 1204.00 TO NODE 1205.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 4 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0330
STREET LENGTH(FEET) = 455.00 CURB HEIGHT(INCHES) = 8.0
STREET HALFWIDTH(FEET) = 30.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 25.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 21.78 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.53
HALFSTREET FLOOD WIDTH(FEET) = 18.62
AVERAGE FLOW VELOCITY(FEET/SEC.) = 5.95
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 3.16
STREET FLOW TRAVEL TIME(MIN.) = 1.27 Tc(MIN.) = 9.32
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 3.591
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN
PUBLIC PARK A 1.39 0.98 0.850 32
COMMERCIAL A 0.46 0.98 0.100 32
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.97
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.662
SUBAREA AREA(ACRES) = 1.85 SUBAREA RUNOFF(CFS) = 4.90
EFFECTIVE AREA(ACRES) = 8.33 AREA-AVERAGED Fm(INCH/HR) = 0.54 AREA-AVERAGED Fp(INCH/HR) = 0.98 AREA-AVERAGED Ap = 0.56 TOTAL AREA(ACRES) = 8.3 PEAK FLOW RATE(CFS) = 22.85
END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.54 HALFSTREET FLOOD WIDTH(FEET) = 19.01 FLOW VELOCITY(FEET/SEC.) = 6.01 DEPTH*VELOCITY(FT*FT/SEC.) = 3.23 Meyers Creek – Existing Condition 2024

Page 78 of 81 ends

LONGEST FLOWPATH FROM NODE 1200.00 TO NODE 1205.00 = 1706.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 1205.00 TO NODE 1206.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 4 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0240
STREET LENGTH(FEET) = 491.00 CURB HEIGHT(INCHES) = 8.0
STREET HALFWIDTH(FEET) = 30.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 25.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 23.59 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.57
HALFSTREET FLOOD WIDTH(FEET) = 20.48
AVERAGE FLOW VELOCITY(FEET/SEC.) = 5.38
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 3.06
STREET FLOW TRAVEL TIME(MIN.) = 1.52 Tc(MIN.) = 10.84
* 10 YEAR RAINFALL INTENSITY(INCH/HR) = 3.310
SUBAREA LOSS RATE DATA(AMC II):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN
PUBLIC PARK A 0.03 0.98 0.850 32
COMMERCIAL A 0.49 0.98 0.100 32
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.97
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.144
SUBAREA AREA(ACRES) = 0.51 SUBAREA RUNOFF(CFS) = 1.47
EFFECTIVE AREA(ACRES) = 8.84 AREA-AVERAGED Fm(INCH/HR) = 0.52 AREA-AVERAGED Fp(INCH/HR) = 0.98 AREA-AVERAGED Ap = 0.53 TOTAL AREA(ACRES) = 8.8 PEAK FLOW RATE(CFS) = 22.85
NOTE: PEAK FLOW RATE DEFAULTED TO UPSTREAM VALUE
END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.56 HALFSTREET FLOOD WIDTH(FEET) = 20.19 FLOW VELOCITY(FEET/SEC.) = 5.36 DEPTH*VELOCITY(FT*FT/SEC.) = 3.01 LONGEST FLOWPATH FROM NODE 1200.00 TO NODE 1206.00 = 2197.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 1206.00 TO NODE 116.00 IS CODE = 31 ---------------------------------------------------------------------------- Meyers Creek – Existing Condition 2024

Page 79 of 81 ends

>>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING COMPUTER-ESTIMATED PIPESIZE (NON-PRESSURE FLOW)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.1640
FLOW LENGTH(FEET) = 67.00 MANNING'S N = 0.013
DEPTH OF FLOW IN 15.0 INCH PIPE IS 11.3 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 22.95
ESTIMATED PIPE DIAMETER(INCH) = 15.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 22.85
PIPE TRAVEL TIME(MIN.) = 0.05 Tc(MIN.) = 10.89
LONGEST FLOWPATH FROM NODE 1200.00 TO NODE 116.00 = 2264.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 116.00 TO NODE 116.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<<
>>>>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<<<<< ============================================================================ TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE:

TIME OF CONCENTRATION(MIN.) = 10.89
RAINFALL INTENSITY(INCH/HR) = 3.30
AREA-AVERAGED Fm(INCH/HR) = 0.52
AREA-AVERAGED Fp(INCH/HR) = 0.98
AREA-AVERAGED Ap = 0.53
EFFECTIVE STREAM AREA(ACRES) = 8.84
TOTAL STREAM AREA(ACRES) = 8.84
PEAK FLOW RATE(CFS) AT CONFLUENCE = 22.85
** CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 1152.53 12.56 2.991 0.46( 0.36) 0.78 398.2 1300.00
1 1152.91 12.58 2.988 0.46( 0.36) 0.78 398.8 700.00
1 1155.14 12.66 2.973 0.46( 0.36) 0.78 401.9 1400.00
1 1157.02 12.73 2.960 0.46( 0.36) 0.78 404.5 1500.00
1 1157.45 12.75 2.957 0.46( 0.36) 0.78 405.2 900.00
1 1168.84 13.20 2.872 0.46( 0.36) 0.79 422.3 1600.00
1 1174.18 13.43 2.831 0.46( 0.36) 0.79 430.5 1000.00
1 1210.63 14.97 2.546 0.45( 0.36) 0.79 487.3 1100.00
1 1210.80 15.01 2.539 0.45( 0.36) 0.79 488.8 800.00
1 1211.80 15.25 2.529 0.45( 0.36) 0.79 497.3 600.00
1 1212.12 15.29 2.527 0.45( 0.36) 0.79 498.9 200.00
1 1217.39 16.16 2.490 0.45( 0.36) 0.79 528.4 100.00
1 1227.53 17.98 2.411 0.44( 0.35) 0.80 587.4 1105.00
1 1225.13 20.27 2.311 0.44( 0.36) 0.81 640.6 500.00
1 1297.46 27.19 2.012 0.44( 0.36) 0.82 797.4 300.00
1 1295.22 27.53 1.997 0.44( 0.36) 0.82 802.3 400.00
2 22.85 10.89 3.301 0.98( 0.52) 0.53 8.8 1200.00
Meyers Creek – Existing Condition 2024

Page 80 of 81 ends

RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO
CONFLUENCE FORMULA USED FOR 2 STREAMS.
** PEAK FLOW RATE TABLE **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 1139.28 10.89 3.301 0.47( 0.36) 0.78 353.9 1200.00
2 1172.83 12.56 2.991 0.47( 0.36) 0.78 407.0 1300.00
3 1173.19 12.58 2.988 0.47( 0.36) 0.78 407.6 700.00
4 1175.30 12.66 2.973 0.47( 0.36) 0.78 410.7 1400.00
5 1177.07 12.73 2.960 0.47( 0.36) 0.78 413.4 1500.00
6 1177.47 12.75 2.957 0.47( 0.36) 0.78 414.0 900.00
7 1188.17 13.20 2.872 0.46( 0.36) 0.78 431.1 1600.00
8 1193.17 13.43 2.831 0.46( 0.36) 0.78 439.3 1000.00
9 1227.28 14.97 2.546 0.46( 0.36) 0.79 496.1 1100.00
10 1227.39 15.01 2.539 0.46( 0.36) 0.79 497.7 800.00
11 1228.31 15.25 2.529 0.46( 0.36) 0.79 506.1 600.00
12 1228.62 15.29 2.527 0.46( 0.36) 0.79 507.7 200.00
13 1233.58 16.16 2.490 0.45( 0.36) 0.79 537.3 100.00
14 1243.07 17.98 2.411 0.45( 0.36) 0.80 596.3 1105.00
15 1239.86 20.27 2.311 0.45( 0.36) 0.80 649.4 500.00
16 1309.72 27.19 2.012 0.44( 0.36) 0.82 806.3 300.00
17 1307.36 27.53 1.997 0.44( 0.36) 0.82 811.2 400.00
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 1309.72 Tc(MIN.) = 27.19
EFFECTIVE AREA(ACRES) = 806.26 AREA-AVERAGED Fm(INCH/HR) = 0.36 AREA-AVERAGED Fp(INCH/HR) = 0.44 AREA-AVERAGED Ap = 0.82 TOTAL AREA(ACRES) = 811.2
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 116.00 = 6473.00 FEET. ============================================================================ END OF STUDY SUMMARY:

TOTAL AREA(ACRES) = 811.2 TC(MIN.) = 27.19
EFFECTIVE AREA(ACRES) = 806.26 AREA-AVERAGED Fm(INCH/HR)= 0.36 AREA-AVERAGED Fp(INCH/HR) = 0.44 AREA-AVERAGED Ap = 0.817 PEAK FLOW RATE(CFS) = 1309.72
** PEAK FLOW RATE TABLE **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 1139.28 10.89 3.301 0.47( 0.36) 0.78 353.9 1200.00
2 1172.83 12.56 2.991 0.47( 0.36) 0.78 407.0 1300.00
3 1173.19 12.58 2.988 0.47( 0.36) 0.78 407.6 700.00
4 1175.30 12.66 2.973 0.47( 0.36) 0.78 410.7 1400.00
5 1177.07 12.73 2.960 0.47( 0.36) 0.78 413.4 1500.00
6 1177.47 12.75 2.957 0.47( 0.36) 0.78 414.0 900.00
7 1188.17 13.20 2.872 0.46( 0.36) 0.78 431.1 1600.00
8 1193.17 13.43 2.831 0.46( 0.36) 0.78 439.3 1000.00
9 1227.28 14.97 2.546 0.46( 0.36) 0.79 496.1 1100.00
10 1227.39 15.01 2.539 0.46( 0.36) 0.79 497.7 800.00
Meyers Creek – Existing Condition 2024

Page 81 of 81 ends

11 1228.31 15.25 2.529 0.46( 0.36) 0.79 506.1 600.00
12 1228.62 15.29 2.527 0.46( 0.36) 0.79 507.7 200.00
13 1233.58 16.16 2.490 0.45( 0.36) 0.79 537.3 100.00
14 1243.07 17.98 2.411 0.45( 0.36) 0.80 596.3 1105.00
15 1239.86 20.27 2.311 0.45( 0.36) 0.80 649.4 500.00
16 1309.72 27.19 2.012 0.44( 0.36) 0.82 806.3 300.00
17 1307.36 27.53 1.997 0.44( 0.36) 0.82 811.2 400.00
============================================================================ ============================================================================

END OF RATIONAL METHOD ANALYSIS
100YR-FUTURE-NOIMPROVEMENTS.docx Page 1 of 81
____________________________________________________________________________ ****************************************************************************

RATIONAL METHOD HYDROLOGY COMPUTER PROGRAM PACKAGE
(Reference: 1986 SAN BERNARDINO CO. HYDROLOGY CRITERION) (c) Copyright 1983-2015 Advanced Engineering Software (aes) Ver. 22.0 Release Date: 07/01/2015 License ID 1673
Analysis prepared by:

************************** DESCRIPTION OF STUDY ************************** * Hydrology Study - Meyers Creek - FUTURE CONDITION - NO IMPROVEMENTS * * Rational Method - 100-yr *
* 4/15/2024 *
************************************************************************** FILE NAME: 100MEY4.DAT
TIME/DATE OF STUDY: 10:25 04/16/2024
============================================================================ USER SPECIFIED HYDROLOGY AND HYDRAULIC MODEL INFORMATION:
============================================================================ --*TIME-OF-CONCENTRATION MODEL*--
USER SPECIFIED STORM EVENT(YEAR) = 100.00
SPECIFIED MINIMUM PIPE SIZE(INCH) = 12.00
SPECIFIED PERCENT OF GRADIENTS(DECIMAL) TO USE FOR FRICTION SLOPE = 0.90 *USER-DEFINED TABLED RAINFALL USED*
NUMBER OF [TIME,INTENSITY] DATA PAIRS = 6
1) 5.00; 7.080
2) 15.00; 4.090
3) 30.00; 3.040
4) 60.00; 2.310
5) 120.00; 1.570
6) 360.00; 0.908
*ANTECEDENT MOISTURE CONDITION (AMC) III ASSUMED FOR RATIONAL METHOD* *USER-DEFINED STREET-SECTIONS FOR COUPLED PIPEFLOW AND STREETFLOW MODEL* HALF- CROWN TO STREET-CROSSFALL: CURB GUTTER-GEOMETRIES: MANNING

WIDTH CROSSFALL IN- / OUT-/PARK- HEIGHT WIDTH LIP HIKE FACTOR NO. (FT) (FT) SIDE / SIDE/ WAY (FT) (FT) (FT) (FT) (n)
=== ===== ========= ================= ====== ===== ====== ===== ======= 1 30.0 20.0 0.018/0.018/0.020 0.67 2.00 0.0312 0.167 0.0150 2 18.0 13.0 0.020/0.020/0.050 0.50 1.50 0.0312 0.125 0.0150 3 25.0 20.0 0.020/0.020/0.050 0.67 2.00 0.0312 0.167 0.0150 4 30.0 25.0 0.020/0.020/0.050 0.67 2.00 0.0312 0.167 0.0150 5 22.0 17.0 0.020/0.020/0.050 0.67 2.00 0.0312 0.167 0.0150 6 19.0 14.0 0.020/0.020/0.050 0.67 2.00 0.0312 0.167 0.0150 GLOBAL STREET FLOW-DEPTH CONSTRAINTS:

Meyers Creek – Existing Condition 2024

Page 2 of 81 ends

1. Relative Flow-Depth = 0.00 FEET
as (Maximum Allowable Street Flow Depth) - (Top-of-Curb)

2. (Depth)*(Velocity) Constraint = 6.0 (FT*FT/S)
*SIZE PIPE WITH A FLOW CAPACITY GREATER THAN
OR EQUAL TO THE UPSTREAM TRIBUTARY PIPE.*
*USER-SPECIFIED MINIMUM TOPOGRAPHIC SLOPE ADJUSTMENT NOT SELECTED **************************************************************************** FLOW PROCESS FROM NODE 300.00 TO NODE 300.00 IS CODE = 7 ---------------------------------------------------------------------------- >>>>>USER SPECIFIED HYDROLOGY INFORMATION AT NODE<<<<<
============================================================================ USER-SPECIFIED VALUES ARE AS FOLLOWS:

TC(MIN.) = 22.27 RAINFALL INTENSITY(INCH/HR) = 3.58
EFFECTIVE AREA(ACRES) = 186.00
TOTAL AREA(ACRES) = 186.00 PEAK FLOW RATE(CFS) = 538.41 AREA-AVERAGED Fm(INCH/HR) = 0.31 AREA-AVERAGED Fp(INCH/HR) = 0.40 AREA-AVERAGED Ap = 0.78
NOTE: EFFECTIVE AREA IS USED AS THE TOTAL CONTRIBUTING AREA FOR ALL CONFLUENCE ANALYSES.
**************************************************************************** FLOW PROCESS FROM NODE 300.00 TO NODE 301.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 2018.00 DOWNSTREAM(FEET) = 1986.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 381.00 CHANNEL SLOPE = 0.0840 CHANNEL FLOW THRU SUBAREA(CFS) = 538.41
FLOW VELOCITY(FEET/SEC) = 23.24 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.27 Tc(MIN.) = 22.55
LONGEST FLOWPATH FROM NODE 300.00 TO NODE 301.00 = 381.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 301.00 TO NODE 301.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 22.55
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 3.562
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.70 0.74 0.500 52

RESIDENTIAL
"5-7 DWELLINGS/ACRE" B 0.69 0.42 0.500 76

RESIDENTIAL
"5-7 DWELLINGS/ACRE" D 1.69 0.21 0.500 91
Meyers Creek – Existing Condition 2024

Page 3 of 81 ends

COMMERCIAL A 0.02 0.74 0.100 52
COMMERCIAL B 0.03 0.42 0.100 76
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.38
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.493
SUBAREA AREA(ACRES) = 3.13 SUBAREA RUNOFF(CFS) = 9.52
EFFECTIVE AREA(ACRES) = 189.13 AREA-AVERAGED Fm(INCH/HR) = 0.31 AREA-AVERAGED Fp(INCH/HR) = 0.40 AREA-AVERAGED Ap = 0.78 TOTAL AREA(ACRES) = 189.1 PEAK FLOW RATE(CFS) = 553.51
**************************************************************************** FLOW PROCESS FROM NODE 301.00 TO NODE 302.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1986.00 DOWNSTREAM(FEET) = 1913.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 996.00 CHANNEL SLOPE = 0.0733 CHANNEL FLOW THRU SUBAREA(CFS) = 553.51
FLOW VELOCITY(FEET/SEC) = 21.90 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.76 Tc(MIN.) = 23.31
LONGEST FLOWPATH FROM NODE 300.00 TO NODE 302.00 = 1377.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 302.00 TO NODE 302.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 23.31
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 3.509
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 2.30 0.74 0.500 52

RESIDENTIAL
"5-7 DWELLINGS/ACRE" B 1.72 0.42 0.500 76

RESIDENTIAL
"5-7 DWELLINGS/ACRE" D 0.87 0.21 0.500 91
COMMERCIAL A 0.15 0.74 0.100 52
COMMERCIAL B 0.09 0.42 0.100 76
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.54
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.481
SUBAREA AREA(ACRES) = 5.13 SUBAREA RUNOFF(CFS) = 15.01
EFFECTIVE AREA(ACRES) = 194.26 AREA-AVERAGED Fm(INCH/HR) = 0.31 AREA-AVERAGED Fp(INCH/HR) = 0.40 AREA-AVERAGED Ap = 0.77 TOTAL AREA(ACRES) = 194.3 PEAK FLOW RATE(CFS) = 559.49
**************************************************************************** FLOW PROCESS FROM NODE 302.00 TO NODE 302.00 IS CODE = 10 ---------------------------------------------------------------------------- Meyers Creek – Existing Condition 2024

Page 4 of 81 ends

>>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 3 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 400.00 TO NODE 400.00 IS CODE = 7 ---------------------------------------------------------------------------- >>>>>USER SPECIFIED HYDROLOGY INFORMATION AT NODE<<<<<
============================================================================ USER-SPECIFIED VALUES ARE AS FOLLOWS:

TC(MIN.) = 22.65 RAINFALL INTENSITY(INCH/HR) = 3.55
EFFECTIVE AREA(ACRES) = 341.00
TOTAL AREA(ACRES) = 341.00 PEAK FLOW RATE(CFS) = 1063.00 AREA-AVERAGED Fm(INCH/HR) = 0.12 AREA-AVERAGED Fp(INCH/HR) = 0.13 AREA-AVERAGED Ap = 0.95
NOTE: EFFECTIVE AREA IS USED AS THE TOTAL CONTRIBUTING AREA FOR ALL CONFLUENCE ANALYSES.
**************************************************************************** FLOW PROCESS FROM NODE 400.00 TO NODE 401.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1995.00 DOWNSTREAM(FEET) = 1961.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 578.00 CHANNEL SLOPE = 0.0588 CHANNEL FLOW THRU SUBAREA(CFS) = 1063.00
FLOW VELOCITY(FEET/SEC) = 24.25 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.40 Tc(MIN.) = 23.05
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 401.00 = 1955.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 401.00 TO NODE 401.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 23.05
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 3.527
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.39 0.74 0.500 52

RESIDENTIAL
"5-7 DWELLINGS/ACRE" C 0.10 0.27 0.500 86

RESIDENTIAL
"5-7 DWELLINGS/ACRE" D 5.71 0.21 0.500 91
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.24
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA AREA(ACRES) = 6.20 SUBAREA RUNOFF(CFS) = 18.98
EFFECTIVE AREA(ACRES) = 347.20 AREA-AVERAGED Fm(INCH/HR) = 0.12 Meyers Creek – Existing Condition 2024

Page 5 of 81 ends

AREA-AVERAGED Fp(INCH/HR) = 0.13 AREA-AVERAGED Ap = 0.94 TOTAL AREA(ACRES) = 347.2 PEAK FLOW RATE(CFS) = 1063.42 **************************************************************************** FLOW PROCESS FROM NODE 401.00 TO NODE 302.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1961.00 DOWNSTREAM(FEET) = 1913.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 867.00 CHANNEL SLOPE = 0.0554 CHANNEL FLOW THRU SUBAREA(CFS) = 1063.42
FLOW VELOCITY(FEET/SEC) = 23.53 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.61 Tc(MIN.) = 23.66
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 302.00 = 2822.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 302.00 TO NODE 302.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 23.66
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 3.484
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 3.76 0.74 0.500 52

RESIDENTIAL
"5-7 DWELLINGS/ACRE" D 1.48 0.21 0.500 91
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.59
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA AREA(ACRES) = 5.24 SUBAREA RUNOFF(CFS) = 15.03
EFFECTIVE AREA(ACRES) = 352.43 AREA-AVERAGED Fm(INCH/HR) = 0.13 AREA-AVERAGED Fp(INCH/HR) = 0.13 AREA-AVERAGED Ap = 0.94 TOTAL AREA(ACRES) = 352.4 PEAK FLOW RATE(CFS) = 1065.02 **************************************************************************** FLOW PROCESS FROM NODE 302.00 TO NODE 302.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 3 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 1065.02 23.66 3.484 0.13( 0.13) 0.94 352.4 400.00
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 302.00 = 2822.00 FEET. ** MEMORY BANK # 3 CONFLUENCE DATA **
Meyers Creek – Existing Condition 2024

Page 6 of 81 ends

STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 559.49 23.31 3.509 0.40( 0.31) 0.77 194.3 300.00
LONGEST FLOWPATH FROM NODE 300.00 TO NODE 302.00 = 1377.00 FEET. ** PEAK FLOW RATE TABLE **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 1616.28 23.31 3.509 0.22( 0.19) 0.88 541.4 300.00
2 1620.16 23.66 3.484 0.22( 0.19) 0.88 546.7 400.00
TOTAL AREA(ACRES) = 546.7
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 1620.16 Tc(MIN.) = 23.661
EFFECTIVE AREA(ACRES) = 546.70 AREA-AVERAGED Fm(INCH/HR) = 0.19 AREA-AVERAGED Fp(INCH/HR) = 0.22 AREA-AVERAGED Ap = 0.88 TOTAL AREA(ACRES) = 546.7
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 302.00 = 2822.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 302.00 TO NODE 302.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 3 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 302.00 TO NODE 303.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1913.00 DOWNSTREAM(FEET) = 1870.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 942.00 CHANNEL SLOPE = 0.0456 CHANNEL FLOW THRU SUBAREA(CFS) = 1620.16
FLOW VELOCITY(FEET/SEC) = 24.54 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.64 Tc(MIN.) = 24.30
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 303.00 = 3764.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 303.00 TO NODE 303.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 24.30
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 3.439
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 1.03 0.74 0.500 52
Meyers Creek – Existing Condition 2024

Page 7 of 81 ends

RESIDENTIAL
"5-7 DWELLINGS/ACRE" B 2.02 0.42 0.500 76
COMMERCIAL A 0.25 0.74 0.100 52
COMMERCIAL B 1.63 0.42 0.100 76
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.52
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.347
SUBAREA AREA(ACRES) = 4.93 SUBAREA RUNOFF(CFS) = 14.46
EFFECTIVE AREA(ACRES) = 551.63 AREA-AVERAGED Fm(INCH/HR) = 0.19 AREA-AVERAGED Fp(INCH/HR) = 0.22 AREA-AVERAGED Ap = 0.87 TOTAL AREA(ACRES) = 551.6 PEAK FLOW RATE(CFS) = 1620.16 NOTE: PEAK FLOW RATE DEFAULTED TO UPSTREAM VALUE
**************************************************************************** FLOW PROCESS FROM NODE 303.00 TO NODE 303.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 1 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 500.00 TO NODE 501.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
>>USE TIME-OF-CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< ============================================================================ INITIAL SUBAREA FLOW-LENGTH(FEET) = 576.00
ELEVATION DATA: UPSTREAM(FEET) = 1975.00 DOWNSTREAM(FEET) = 1967.00 Tc = K*[(LENGTH** 3.00)/(ELEVATION CHANGE)]**0.20
SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = 11.630
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 5.098
SUBAREA Tc AND LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS Tc
LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN (MIN.)

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 1.02 0.74 0.500 52 11.63

RESIDENTIAL
"5-7 DWELLINGS/ACRE" C 0.68 0.27 0.500 86 11.63

RESIDENTIAL
"5-7 DWELLINGS/ACRE" D 0.03 0.21 0.500 91 11.63
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.55
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA RUNOFF(CFS) = 7.55
TOTAL AREA(ACRES) = 1.74 PEAK FLOW RATE(CFS) = 7.55
**************************************************************************** FLOW PROCESS FROM NODE 501.00 TO NODE 502.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ Meyers Creek – Existing Condition 2024

Page 8 of 81 ends

ELEVATION DATA: UPSTREAM(FEET) = 1967.00 DOWNSTREAM(FEET) = 1919.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 797.00 CHANNEL SLOPE = 0.0602 CHANNEL FLOW THRU SUBAREA(CFS) = 7.55
FLOW VELOCITY(FEET/SEC) = 5.72 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 2.32 Tc(MIN.) = 13.95
LONGEST FLOWPATH FROM NODE 500.00 TO NODE 502.00 = 1373.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 502.00 TO NODE 502.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 13.95
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 4.403
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 2.13 0.74 0.500 52

RESIDENTIAL
"5-7 DWELLINGS/ACRE" C 1.29 0.27 0.500 86
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.56
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA AREA(ACRES) = 3.43 SUBAREA RUNOFF(CFS) = 12.71
EFFECTIVE AREA(ACRES) = 5.16 AREA-AVERAGED Fm(INCH/HR) = 0.28 AREA-AVERAGED Fp(INCH/HR) = 0.56 AREA-AVERAGED Ap = 0.50 TOTAL AREA(ACRES) = 5.2 PEAK FLOW RATE(CFS) = 19.17
**************************************************************************** FLOW PROCESS FROM NODE 502.00 TO NODE 503.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1919.00 DOWNSTREAM(FEET) = 1884.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 789.00 CHANNEL SLOPE = 0.0444 CHANNEL FLOW THRU SUBAREA(CFS) = 19.17
FLOW VELOCITY(FEET/SEC) = 6.24 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 2.11 Tc(MIN.) = 16.06
LONGEST FLOWPATH FROM NODE 500.00 TO NODE 503.00 = 2162.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 503.00 TO NODE 503.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 16.06
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 4.016
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS
Meyers Creek – Existing Condition 2024

Page 9 of 81 ends

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 2.64 0.74 0.500 52

RESIDENTIAL
"5-7 DWELLINGS/ACRE" C 2.67 0.27 0.500 86
COMMERCIAL C 0.26 0.27 0.100 86
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.50
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.481
SUBAREA AREA(ACRES) = 5.57 SUBAREA RUNOFF(CFS) = 18.91
EFFECTIVE AREA(ACRES) = 10.73 AREA-AVERAGED Fm(INCH/HR) = 0.26 AREA-AVERAGED Fp(INCH/HR) = 0.53 AREA-AVERAGED Ap = 0.49 TOTAL AREA(ACRES) = 10.7 PEAK FLOW RATE(CFS) = 36.28
**************************************************************************** FLOW PROCESS FROM NODE 503.00 TO NODE 503.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<<
============================================================================ TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE:

TIME OF CONCENTRATION(MIN.) = 16.06
RAINFALL INTENSITY(INCH/HR) = 4.02
AREA-AVERAGED Fm(INCH/HR) = 0.26
AREA-AVERAGED Fp(INCH/HR) = 0.53
AREA-AVERAGED Ap = 0.49
EFFECTIVE STREAM AREA(ACRES) = 10.73
TOTAL STREAM AREA(ACRES) = 10.73
PEAK FLOW RATE(CFS) AT CONFLUENCE = 36.28
**************************************************************************** FLOW PROCESS FROM NODE 600.00 TO NODE 601.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
>>USE TIME-OF-CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< ============================================================================ INITIAL SUBAREA FLOW-LENGTH(FEET) = 997.00
ELEVATION DATA: UPSTREAM(FEET) = 2302.00 DOWNSTREAM(FEET) = 2058.00 Tc = K*[(LENGTH** 3.00)/(ELEVATION CHANGE)]**0.20
SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = 8.160
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.135
SUBAREA Tc AND LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS Tc
LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN (MIN.)

RESIDENTIAL
"5-7 DWELLINGS/ACRE" C 0.28 0.27 0.500 86 8.16

RESIDENTIAL
"5-7 DWELLINGS/ACRE" D 4.39 0.21 0.500 91 8.16
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.21
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
Meyers Creek – Existing Condition 2024

Page 10 of 81 ends

SUBAREA RUNOFF(CFS) = 25.33
TOTAL AREA(ACRES) = 4.67 PEAK FLOW RATE(CFS) = 25.33
**************************************************************************** FLOW PROCESS FROM NODE 601.00 TO NODE 602.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 2058.00 DOWNSTREAM(FEET) = 1982.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 773.00 CHANNEL SLOPE = 0.0983 CHANNEL FLOW THRU SUBAREA(CFS) = 25.33
FLOW VELOCITY(FEET/SEC) = 10.02 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 1.29 Tc(MIN.) = 9.45
LONGEST FLOWPATH FROM NODE 600.00 TO NODE 602.00 = 1770.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 602.00 TO NODE 602.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 9.45
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 5.751
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.40 0.74 0.500 52

RESIDENTIAL
"5-7 DWELLINGS/ACRE" C 6.53 0.27 0.500 86

RESIDENTIAL
"5-7 DWELLINGS/ACRE" D 2.24 0.21 0.500 91
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.28
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA AREA(ACRES) = 9.17 SUBAREA RUNOFF(CFS) = 46.33
EFFECTIVE AREA(ACRES) = 13.84 AREA-AVERAGED Fm(INCH/HR) = 0.13 AREA-AVERAGED Fp(INCH/HR) = 0.26 AREA-AVERAGED Ap = 0.50 TOTAL AREA(ACRES) = 13.8 PEAK FLOW RATE(CFS) = 70.04
**************************************************************************** FLOW PROCESS FROM NODE 602.00 TO NODE 603.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1982.00 DOWNSTREAM(FEET) = 1916.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 788.00 CHANNEL SLOPE = 0.0838 CHANNEL FLOW THRU SUBAREA(CFS) = 70.04
FLOW VELOCITY(FEET/SEC) = 12.36 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 1.06 Tc(MIN.) = 10.51
Meyers Creek – Existing Condition 2024

Page 11 of 81 ends

LONGEST FLOWPATH FROM NODE 600.00 TO NODE 603.00 = 2558.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 603.00 TO NODE 603.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 10.51
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 5.433
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 7.47 0.74 0.500 52

RESIDENTIAL
"5-7 DWELLINGS/ACRE" C 6.48 0.27 0.500 86

RESIDENTIAL
"5-7 DWELLINGS/ACRE" D 0.50 0.21 0.500 91
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.51
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA AREA(ACRES) = 14.45 SUBAREA RUNOFF(CFS) = 67.33 EFFECTIVE AREA(ACRES) = 28.29 AREA-AVERAGED Fm(INCH/HR) = 0.19 AREA-AVERAGED Fp(INCH/HR) = 0.39 AREA-AVERAGED Ap = 0.50 TOTAL AREA(ACRES) = 28.3 PEAK FLOW RATE(CFS) = 133.42
**************************************************************************** FLOW PROCESS FROM NODE 603.00 TO NODE 503.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1916.00 DOWNSTREAM(FEET) = 1884.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 544.00 CHANNEL SLOPE = 0.0588 CHANNEL FLOW THRU SUBAREA(CFS) = 133.42
FLOW VELOCITY(FEET/SEC) = 12.56 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.72 Tc(MIN.) = 11.23
LONGEST FLOWPATH FROM NODE 600.00 TO NODE 503.00 = 3102.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 503.00 TO NODE 503.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<<
>>>>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<<<<< ============================================================================ TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE:

TIME OF CONCENTRATION(MIN.) = 11.23
RAINFALL INTENSITY(INCH/HR) = 5.22
AREA-AVERAGED Fm(INCH/HR) = 0.19
AREA-AVERAGED Fp(INCH/HR) = 0.39
Meyers Creek – Existing Condition 2024

Page 12 of 81 ends

AREA-AVERAGED Ap = 0.50
EFFECTIVE STREAM AREA(ACRES) = 28.29
TOTAL STREAM AREA(ACRES) = 28.29
PEAK FLOW RATE(CFS) AT CONFLUENCE = 133.42
** CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 36.28 16.06 4.016 0.53( 0.26) 0.49 10.7 500.00
2 133.42 11.23 5.217 0.39( 0.19) 0.50 28.3 600.00

RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO
CONFLUENCE FORMULA USED FOR 2 STREAMS.
** PEAK FLOW RATE TABLE **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 166.90 11.23 5.217 0.42( 0.21) 0.50 35.8 600.00
2 137.79 16.06 4.016 0.43( 0.21) 0.50 39.0 500.00
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 166.90 Tc(MIN.) = 11.23
EFFECTIVE AREA(ACRES) = 35.80 AREA-AVERAGED Fm(INCH/HR) = 0.21 AREA-AVERAGED Fp(INCH/HR) = 0.42 AREA-AVERAGED Ap = 0.50 TOTAL AREA(ACRES) = 39.0
LONGEST FLOWPATH FROM NODE 600.00 TO NODE 503.00 = 3102.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 503.00 TO NODE 303.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1884.00 DOWNSTREAM(FEET) = 1870.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 327.00 CHANNEL SLOPE = 0.0428 CHANNEL FLOW THRU SUBAREA(CFS) = 166.90
FLOW VELOCITY(FEET/SEC) = 11.48 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.47 Tc(MIN.) = 11.71
LONGEST FLOWPATH FROM NODE 600.00 TO NODE 303.00 = 3429.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 303.00 TO NODE 303.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 11.71
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 5.075
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN
Meyers Creek – Existing Condition 2024

Page 13 of 81 ends

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.91 0.74 0.500 52

RESIDENTIAL
"5-7 DWELLINGS/ACRE" B 0.65 0.42 0.500 76
COMMERCIAL B 0.05 0.42 0.100 76
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.61
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.489
SUBAREA AREA(ACRES) = 1.61 SUBAREA RUNOFF(CFS) = 6.92
EFFECTIVE AREA(ACRES) = 37.41 AREA-AVERAGED Fm(INCH/HR) = 0.21 AREA-AVERAGED Fp(INCH/HR) = 0.42 AREA-AVERAGED Ap = 0.50 TOTAL AREA(ACRES) = 40.6 PEAK FLOW RATE(CFS) = 166.90
NOTE: PEAK FLOW RATE DEFAULTED TO UPSTREAM VALUE
**************************************************************************** FLOW PROCESS FROM NODE 303.00 TO NODE 303.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 1 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 166.90 11.71 5.075 0.42( 0.21) 0.50 37.4 600.00
2 137.79 16.56 3.980 0.43( 0.22) 0.50 40.6 500.00
LONGEST FLOWPATH FROM NODE 600.00 TO NODE 303.00 = 3429.00 FEET. ** MEMORY BANK # 1 CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 1616.28 23.95 3.464 0.22( 0.19) 0.87 546.3 300.00
2 1620.16 24.30 3.439 0.22( 0.19) 0.87 551.6 400.00
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 303.00 = 3764.00 FEET. ** PEAK FLOW RATE TABLE **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 1346.01 11.71 5.075 0.24( 0.19) 0.82 304.5 600.00
2 1432.39 16.56 3.980 0.23( 0.19) 0.83 418.6 500.00
3 1735.17 23.95 3.464 0.23( 0.19) 0.84 587.0 300.00
4 1738.13 24.30 3.439 0.23( 0.19) 0.85 592.3 400.00
TOTAL AREA(ACRES) = 592.3
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 1738.13 Tc(MIN.) = 24.301
EFFECTIVE AREA(ACRES) = 592.27 AREA-AVERAGED Fm(INCH/HR) = 0.19 AREA-AVERAGED Fp(INCH/HR) = 0.23 AREA-AVERAGED Ap = 0.85 TOTAL AREA(ACRES) = 592.3
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 303.00 = 3764.00 FEET. **************************************************************************** Meyers Creek – Existing Condition 2024

Page 14 of 81 ends

FLOW PROCESS FROM NODE 303.00 TO NODE 303.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 1 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 303.00 TO NODE 108.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1870.00 DOWNSTREAM(FEET) = 1855.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 219.00 CHANNEL SLOPE = 0.0685 NOTE: FLOW VELOCITY OF 30 FPS WAS ASSUMED IN TRAVEL TIME ESTIMATION CHANNEL FLOW THRU SUBAREA(CFS) = 1738.13
FLOW VELOCITY(FEET/SEC) = 30.00 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.12 Tc(MIN.) = 24.42
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 108.00 = 3983.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 108.00 TO NODE 108.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 24.42
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 3.430
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.03 0.74 0.500 52

RESIDENTIAL
"5-7 DWELLINGS/ACRE" B 0.37 0.42 0.500 76
COMMERCIAL B 0.12 0.42 0.100 76
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.45
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.409
SUBAREA AREA(ACRES) = 0.52 SUBAREA RUNOFF(CFS) = 1.52
EFFECTIVE AREA(ACRES) = 592.79 AREA-AVERAGED Fm(INCH/HR) = 0.19 AREA-AVERAGED Fp(INCH/HR) = 0.23 AREA-AVERAGED Ap = 0.84 TOTAL AREA(ACRES) = 592.8 PEAK FLOW RATE(CFS) = 1738.13 NOTE: PEAK FLOW RATE DEFAULTED TO UPSTREAM VALUE
**************************************************************************** FLOW PROCESS FROM NODE 108.00 TO NODE 108.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 2 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 100.00 TO NODE 101.00 IS CODE = 21 Meyers Creek – Existing Condition 2024

Page 15 of 81 ends

---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
>>USE TIME-OF-CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< ============================================================================ INITIAL SUBAREA FLOW-LENGTH(FEET) = 526.00
ELEVATION DATA: UPSTREAM(FEET) = 2130.00 DOWNSTREAM(FEET) = 2072.00 Tc = K*[(LENGTH** 3.00)/(ELEVATION CHANGE)]**0.20
SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = 5.791
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.843
SUBAREA Tc AND LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS Tc
LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN (MIN.)

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.74 0.74 0.500 52 7.41
COMMERCIAL A 0.03 0.74 0.100 52 5.79
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.485
SUBAREA RUNOFF(CFS) = 4.48
TOTAL AREA(ACRES) = 0.77 PEAK FLOW RATE(CFS) = 4.48
**************************************************************************** FLOW PROCESS FROM NODE 101.00 TO NODE 102.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 6 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0370
STREET LENGTH(FEET) = 163.00 CURB HEIGHT(INCHES) = 8.0
STREET HALFWIDTH(FEET) = 19.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 14.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 7.88 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.40
HALFSTREET FLOOD WIDTH(FEET) = 11.92
AVERAGE FLOW VELOCITY(FEET/SEC.) = 4.89
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 1.94
STREET FLOW TRAVEL TIME(MIN.) = 0.56 Tc(MIN.) = 6.35
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.677
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS
Meyers Creek – Existing Condition 2024

Page 16 of 81 ends

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.64 0.74 0.500 52
COMMERCIAL A 0.53 0.74 0.100 52
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.318
SUBAREA AREA(ACRES) = 1.17 SUBAREA RUNOFF(CFS) = 6.79
EFFECTIVE AREA(ACRES) = 1.94 AREA-AVERAGED Fm(INCH/HR) = 0.28 AREA-AVERAGED Fp(INCH/HR) = 0.74 AREA-AVERAGED Ap = 0.38 TOTAL AREA(ACRES) = 1.9 PEAK FLOW RATE(CFS) = 11.16
END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.43 HALFSTREET FLOOD WIDTH(FEET) = 13.83 FLOW VELOCITY(FEET/SEC.) = 5.31 DEPTH*VELOCITY(FT*FT/SEC.) = 2.31 LONGEST FLOWPATH FROM NODE 100.00 TO NODE 102.00 = 689.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 102.00 TO NODE 103.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 6 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0810
STREET LENGTH(FEET) = 999.00 CURB HEIGHT(INCHES) = 8.0
STREET HALFWIDTH(FEET) = 19.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 14.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 13.52 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.41
HALFSTREET FLOOD WIDTH(FEET) = 12.68
AVERAGE FLOW VELOCITY(FEET/SEC.) = 7.52
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 3.10
STREET FLOW TRAVEL TIME(MIN.) = 2.21 Tc(MIN.) = 8.56
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.015
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.18 0.74 0.500 52
COMMERCIAL A 0.59 0.74 0.100 52
COMMERCIAL B 0.12 0.42 0.100 76
Meyers Creek – Existing Condition 2024

Page 17 of 81 ends

SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.72
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.182
SUBAREA AREA(ACRES) = 0.89 SUBAREA RUNOFF(CFS) = 4.72
EFFECTIVE AREA(ACRES) = 2.83 AREA-AVERAGED Fm(INCH/HR) = 0.24 AREA-AVERAGED Fp(INCH/HR) = 0.74 AREA-AVERAGED Ap = 0.32 TOTAL AREA(ACRES) = 2.8 PEAK FLOW RATE(CFS) = 14.73
END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.42 HALFSTREET FLOOD WIDTH(FEET) = 13.18 FLOW VELOCITY(FEET/SEC.) = 7.65 DEPTH*VELOCITY(FT*FT/SEC.) = 3.23 LONGEST FLOWPATH FROM NODE 100.00 TO NODE 103.00 = 1688.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 103.00 TO NODE 104.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 6 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0840
STREET LENGTH(FEET) = 680.00 CURB HEIGHT(INCHES) = 8.0
STREET HALFWIDTH(FEET) = 19.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 14.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 18.31 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.44
HALFSTREET FLOOD WIDTH(FEET) = 14.32
AVERAGE FLOW VELOCITY(FEET/SEC.) = 8.17
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 3.63
STREET FLOW TRAVEL TIME(MIN.) = 1.39 Tc(MIN.) = 9.95
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 5.601
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 1.04 0.74 0.500 52
COMMERCIAL A 0.46 0.74 0.100 52
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.378
SUBAREA AREA(ACRES) = 1.49 SUBAREA RUNOFF(CFS) = 7.15
EFFECTIVE AREA(ACRES) = 4.33 AREA-AVERAGED Fm(INCH/HR) = 0.25 AREA-AVERAGED Fp(INCH/HR) = 0.74 AREA-AVERAGED Ap = 0.34 Meyers Creek – Existing Condition 2024

Page 18 of 81 ends

TOTAL AREA(ACRES) = 4.3 PEAK FLOW RATE(CFS) = 20.83
END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.46 HALFSTREET FLOOD WIDTH(FEET) = 15.14 FLOW VELOCITY(FEET/SEC.) = 8.39 DEPTH*VELOCITY(FT*FT/SEC.) = 3.87 LONGEST FLOWPATH FROM NODE 100.00 TO NODE 104.00 = 2368.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 104.00 TO NODE 105.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 6 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0720
STREET LENGTH(FEET) = 152.00 CURB HEIGHT(INCHES) = 8.0
STREET HALFWIDTH(FEET) = 19.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 14.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 26.75 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.50
HALFSTREET FLOOD WIDTH(FEET) = 17.28
AVERAGE FLOW VELOCITY(FEET/SEC.) = 8.43
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 4.24
STREET FLOW TRAVEL TIME(MIN.) = 0.30 Tc(MIN.) = 10.25
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 5.511
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 2.44 0.74 0.500 52
COMMERCIAL A 0.11 0.74 0.100 52
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.482
SUBAREA AREA(ACRES) = 2.55 SUBAREA RUNOFF(CFS) = 11.84
EFFECTIVE AREA(ACRES) = 6.88 AREA-AVERAGED Fm(INCH/HR) = 0.29 AREA-AVERAGED Fp(INCH/HR) = 0.74 AREA-AVERAGED Ap = 0.39 TOTAL AREA(ACRES) = 6.9 PEAK FLOW RATE(CFS) = 32.32
END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.53 HALFSTREET FLOOD WIDTH(FEET) = 18.64 FLOW VELOCITY(FEET/SEC.) = 8.82 DEPTH*VELOCITY(FT*FT/SEC.) = 4.68 Meyers Creek – Existing Condition 2024

Page 19 of 81 ends

LONGEST FLOWPATH FROM NODE 100.00 TO NODE 105.00 = 2520.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 105.00 TO NODE 106.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 6 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0610
STREET LENGTH(FEET) = 146.00 CURB HEIGHT(INCHES) = 8.0
STREET HALFWIDTH(FEET) = 19.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 14.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 42.31 ***STREET FLOW SPLITS OVER STREET-CROWN***
FULL DEPTH(FEET) = 0.54 FLOOD WIDTH(FEET) = 19.00
FULL HALF-STREET VELOCITY(FEET/SEC.) = 8.20
SPLIT DEPTH(FEET) = 0.41 SPLIT FLOOD WIDTH(FEET) = 12.41 SPLIT FLOW(CFS) = 11.15 SPLIT VELOCITY(FEET/SEC.) = 6.45 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.54
HALFSTREET FLOOD WIDTH(FEET) = 19.00
AVERAGE FLOW VELOCITY(FEET/SEC.) = 8.20
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 4.41
STREET FLOW TRAVEL TIME(MIN.) = 0.30 Tc(MIN.) = 10.55
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 5.422
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 3.84 0.74 0.500 52

RESIDENTIAL
"5-7 DWELLINGS/ACRE" B 0.01 0.42 0.500 76
COMMERCIAL A 0.51 0.74 0.100 52
COMMERCIAL B 0.01 0.42 0.100 76
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.453
SUBAREA AREA(ACRES) = 4.37 SUBAREA RUNOFF(CFS) = 19.99
EFFECTIVE AREA(ACRES) = 11.25 AREA-AVERAGED Fm(INCH/HR) = 0.31 AREA-AVERAGED Fp(INCH/HR) = 0.74 AREA-AVERAGED Ap = 0.42 TOTAL AREA(ACRES) = 11.2 PEAK FLOW RATE(CFS) = 51.76
Meyers Creek – Existing Condition 2024

Page 20 of 81 ends

END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.54 HALFSTREET FLOOD WIDTH(FEET) = 19.00 FLOW VELOCITY(FEET/SEC.) = 8.20 DEPTH*VELOCITY(FT*FT/SEC.) = 4.41 LONGEST FLOWPATH FROM NODE 100.00 TO NODE 106.00 = 2666.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 106.00 TO NODE 107.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 6 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0460
STREET LENGTH(FEET) = 954.00 CURB HEIGHT(INCHES) = 8.0
STREET HALFWIDTH(FEET) = 19.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 14.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 65.71 ***STREET FLOWING FULL***
STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.56
HALFSTREET FLOOD WIDTH(FEET) = 19.00
AVERAGE FLOW VELOCITY(FEET/SEC.) = 7.69
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 4.33
STREET FLOW TRAVEL TIME(MIN.) = 2.07 Tc(MIN.) = 12.61
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 4.803
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 5.73 0.74 0.500 52

RESIDENTIAL
"5-7 DWELLINGS/ACRE" B 0.14 0.42 0.500 76
COMMERCIAL A 0.97 0.74 0.100 52
COMMERCIAL B 0.07 0.42 0.100 76
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.73
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.440
SUBAREA AREA(ACRES) = 6.91 SUBAREA RUNOFF(CFS) = 27.85
EFFECTIVE AREA(ACRES) = 18.15 AREA-AVERAGED Fm(INCH/HR) = 0.31 AREA-AVERAGED Fp(INCH/HR) = 0.74 AREA-AVERAGED Ap = 0.43 TOTAL AREA(ACRES) = 18.2 PEAK FLOW RATE(CFS) = 73.35
END OF SUBAREA STREET FLOW HYDRAULICS:

Meyers Creek – Existing Condition 2024

Page 21 of 81 ends

DEPTH(FEET) = 0.58 HALFSTREET FLOOD WIDTH(FEET) = 19.00 FLOW VELOCITY(FEET/SEC.) = 8.05 DEPTH*VELOCITY(FT*FT/SEC.) = 4.65 LONGEST FLOWPATH FROM NODE 100.00 TO NODE 107.00 = 3620.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 107.00 TO NODE 108.00 IS CODE = 31 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING COMPUTER-ESTIMATED PIPESIZE (NON-PRESSURE FLOW)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.2500
FLOW LENGTH(FEET) = 8.00 MANNING'S N = 0.013
DEPTH OF FLOW IN 21.0 INCH PIPE IS 16.8 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 35.61
ESTIMATED PIPE DIAMETER(INCH) = 21.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 73.35
PIPE TRAVEL TIME(MIN.) = 0.00 Tc(MIN.) = 12.62
LONGEST FLOWPATH FROM NODE 100.00 TO NODE 108.00 = 3628.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 108.00 TO NODE 108.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 2 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 73.35 12.62 4.802 0.74( 0.31) 0.43 18.2 100.00
LONGEST FLOWPATH FROM NODE 100.00 TO NODE 108.00 = 3628.00 FEET. ** MEMORY BANK # 2 CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 1346.01 11.83 5.037 0.24( 0.19) 0.82 305.0 600.00
2 1432.39 16.69 3.972 0.23( 0.19) 0.83 419.1 500.00
3 1735.17 24.07 3.455 0.23( 0.19) 0.84 587.5 300.00
4 1738.13 24.42 3.430 0.23( 0.19) 0.84 592.8 400.00
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 108.00 = 3983.00 FEET. ** PEAK FLOW RATE TABLE **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 1418.39 11.83 5.037 0.25( 0.20) 0.80 322.0 600.00
2 1433.29 12.62 4.802 0.25( 0.20) 0.80 341.5 100.00
3 1492.17 16.69 3.972 0.24( 0.20) 0.82 437.2 500.00
4 1786.50 24.07 3.455 0.24( 0.20) 0.83 605.7 300.00
5 1789.06 24.42 3.430 0.24( 0.20) 0.83 610.9 400.00
TOTAL AREA(ACRES) = 610.9
Meyers Creek – Existing Condition 2024

Page 22 of 81 ends

COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 1789.06 Tc(MIN.) = 24.423
EFFECTIVE AREA(ACRES) = 610.94 AREA-AVERAGED Fm(INCH/HR) = 0.20 AREA-AVERAGED Fp(INCH/HR) = 0.24 AREA-AVERAGED Ap = 0.83 TOTAL AREA(ACRES) = 610.9
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 108.00 = 3983.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 108.00 TO NODE 108.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 2 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 108.00 TO NODE 109.00 IS CODE = 37 ---------------------------------------------------------------------------- >>>>>COMPUTE CULVERT TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING COMPUTER-ESTIMATED CULVERT SIZE<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0140
FLOW LENGTH(FEET) = 40.00 MANNING'S N = 0.014
Notes:

1. Reference: "Hydraulic Charts for the Selection of
Highway Culverts", Hydraulic Engineering Circular No. 5, December 1965, Federal Highway Administration.

2. INLET control for all Culvert Analysis.

3. Headwater depth is ASSUMED to be 3 FEET above the culvert soffit.

GIVEN BOX CULVERT HEIGHT(FEET) = 7.50
ESTIMATED BOX CULVERT BASEWIDTH(FEET) = 20.33
CULVERT-FLOW VELOCITY(FEET/SEC.) = 11.73
CULVERT-FLOW(CFS) = 1789.06
CULVERT-FLOW TRAVEL TIME(MIN.) = 0.06 Tc(MIN.) = 24.48
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 109.00 = 4023.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 109.00 TO NODE 109.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<<
============================================================================ TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE:

TIME OF CONCENTRATION(MIN.) = 24.48
RAINFALL INTENSITY(INCH/HR) = 3.43
AREA-AVERAGED Fm(INCH/HR) = 0.20
AREA-AVERAGED Fp(INCH/HR) = 0.24
AREA-AVERAGED Ap = 0.83
EFFECTIVE STREAM AREA(ACRES) = 610.94
TOTAL STREAM AREA(ACRES) = 610.94
PEAK FLOW RATE(CFS) AT CONFLUENCE = 1789.06
Meyers Creek – Existing Condition 2024

Page 23 of 81 ends

**************************************************************************** FLOW PROCESS FROM NODE 200.00 TO NODE 201.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
>>USE TIME-OF-CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< ============================================================================ INITIAL SUBAREA FLOW-LENGTH(FEET) = 284.00
ELEVATION DATA: UPSTREAM(FEET) = 2072.00 DOWNSTREAM(FEET) = 2056.00 Tc = K*[(LENGTH** 3.00)/(ELEVATION CHANGE)]**0.20
SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = 5.177
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 7.027
SUBAREA Tc AND LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS Tc
LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN (MIN.)

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.06 0.74 0.500 52 6.62
COMMERCIAL A 0.15 0.74 0.100 52 5.18
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.217
SUBAREA RUNOFF(CFS) = 1.33
TOTAL AREA(ACRES) = 0.22 PEAK FLOW RATE(CFS) = 1.33
**************************************************************************** FLOW PROCESS FROM NODE 201.00 TO NODE 202.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 6 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0810
STREET LENGTH(FEET) = 111.00 CURB HEIGHT(INCHES) = 8.0
STREET HALFWIDTH(FEET) = 19.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 14.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 2.41 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.26
HALFSTREET FLOOD WIDTH(FEET) = 5.08
AVERAGE FLOW VELOCITY(FEET/SEC.) = 5.39
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 1.40
STREET FLOW TRAVEL TIME(MIN.) = 0.34 Tc(MIN.) = 5.52
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.925
Meyers Creek – Existing Condition 2024

Page 24 of 81 ends

SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.29 0.74 0.500 52
COMMERCIAL A 0.07 0.74 0.100 52
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.419
SUBAREA AREA(ACRES) = 0.37 SUBAREA RUNOFF(CFS) = 2.17
EFFECTIVE AREA(ACRES) = 0.58 AREA-AVERAGED Fm(INCH/HR) = 0.26 AREA-AVERAGED Fp(INCH/HR) = 0.74 AREA-AVERAGED Ap = 0.34 TOTAL AREA(ACRES) = 0.6 PEAK FLOW RATE(CFS) = 3.48
END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.29 HALFSTREET FLOOD WIDTH(FEET) = 6.50
FLOW VELOCITY(FEET/SEC.) = 5.68 DEPTH*VELOCITY(FT*FT/SEC.) = 1.64 LONGEST FLOWPATH FROM NODE 200.00 TO NODE 202.00 = 395.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 202.00 TO NODE 203.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 6 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0900
STREET LENGTH(FEET) = 232.00 CURB HEIGHT(INCHES) = 8.0
STREET HALFWIDTH(FEET) = 19.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 14.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 5.35 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.32
HALFSTREET FLOOD WIDTH(FEET) = 8.04
AVERAGE FLOW VELOCITY(FEET/SEC.) = 6.41
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 2.04
STREET FLOW TRAVEL TIME(MIN.) = 0.60 Tc(MIN.) = 6.12
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.744
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.48 0.74 0.500 52
Meyers Creek – Existing Condition 2024

Page 25 of 81 ends

COMMERCIAL A 0.17 0.74 0.100 52
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.396
SUBAREA AREA(ACRES) = 0.64 SUBAREA RUNOFF(CFS) = 3.74
EFFECTIVE AREA(ACRES) = 1.23 AREA-AVERAGED Fm(INCH/HR) = 0.28 AREA-AVERAGED Fp(INCH/HR) = 0.74 AREA-AVERAGED Ap = 0.37 TOTAL AREA(ACRES) = 1.2 PEAK FLOW RATE(CFS) = 7.13
END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.34 HALFSTREET FLOOD WIDTH(FEET) = 9.29
FLOW VELOCITY(FEET/SEC.) = 6.77 DEPTH*VELOCITY(FT*FT/SEC.) = 2.33 LONGEST FLOWPATH FROM NODE 200.00 TO NODE 203.00 = 627.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 203.00 TO NODE 204.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 6 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0810
STREET LENGTH(FEET) = 319.00 CURB HEIGHT(INCHES) = 8.0
STREET HALFWIDTH(FEET) = 19.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 14.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 9.04 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.37
HALFSTREET FLOOD WIDTH(FEET) = 10.66
AVERAGE FLOW VELOCITY(FEET/SEC.) = 6.82
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 2.53
STREET FLOW TRAVEL TIME(MIN.) = 0.78 Tc(MIN.) = 6.90
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.511
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.43 0.74 0.500 52
COMMERCIAL A 0.23 0.74 0.100 52
COMMERCIAL B 0.01 0.42 0.100 76
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.356
SUBAREA AREA(ACRES) = 0.68 SUBAREA RUNOFF(CFS) = 3.81
Meyers Creek – Existing Condition 2024

Page 26 of 81 ends

EFFECTIVE AREA(ACRES) = 1.90 AREA-AVERAGED Fm(INCH/HR) = 0.27 AREA-AVERAGED Fp(INCH/HR) = 0.74 AREA-AVERAGED Ap = 0.37 TOTAL AREA(ACRES) = 1.9 PEAK FLOW RATE(CFS) = 10.69
END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.39 HALFSTREET FLOOD WIDTH(FEET) = 11.48 FLOW VELOCITY(FEET/SEC.) = 7.09 DEPTH*VELOCITY(FT*FT/SEC.) = 2.75 LONGEST FLOWPATH FROM NODE 200.00 TO NODE 204.00 = 946.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 204.00 TO NODE 205.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 6 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0780
STREET LENGTH(FEET) = 381.00 CURB HEIGHT(INCHES) = 8.0
STREET HALFWIDTH(FEET) = 19.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 14.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 13.81 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.42
HALFSTREET FLOOD WIDTH(FEET) = 12.90
AVERAGE FLOW VELOCITY(FEET/SEC.) = 7.45
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 3.10
STREET FLOW TRAVEL TIME(MIN.) = 0.85 Tc(MIN.) = 7.76
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.256
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.87 0.74 0.500 52
COMMERCIAL A 0.29 0.74 0.100 52
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.399
SUBAREA AREA(ACRES) = 1.16 SUBAREA RUNOFF(CFS) = 6.24
EFFECTIVE AREA(ACRES) = 3.07 AREA-AVERAGED Fm(INCH/HR) = 0.28 AREA-AVERAGED Fp(INCH/HR) = 0.74 AREA-AVERAGED Ap = 0.38 TOTAL AREA(ACRES) = 3.1 PEAK FLOW RATE(CFS) = 16.49
END OF SUBAREA STREET FLOW HYDRAULICS:

Meyers Creek – Existing Condition 2024

Page 27 of 81 ends

DEPTH(FEET) = 0.44 HALFSTREET FLOOD WIDTH(FEET) = 13.94 FLOW VELOCITY(FEET/SEC.) = 7.73 DEPTH*VELOCITY(FT*FT/SEC.) = 3.38 LONGEST FLOWPATH FROM NODE 200.00 TO NODE 205.00 = 1327.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 205.00 TO NODE 206.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 6 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0840
STREET LENGTH(FEET) = 482.00 CURB HEIGHT(INCHES) = 8.0
STREET HALFWIDTH(FEET) = 19.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 14.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 19.55 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.45
HALFSTREET FLOOD WIDTH(FEET) = 14.71
AVERAGE FLOW VELOCITY(FEET/SEC.) = 8.31
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 3.76
STREET FLOW TRAVEL TIME(MIN.) = 0.97 Tc(MIN.) = 8.72
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 5.967
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.79 0.74 0.500 52
COMMERCIAL A 0.40 0.74 0.100 52
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.365
SUBAREA AREA(ACRES) = 1.19 SUBAREA RUNOFF(CFS) = 6.11
EFFECTIVE AREA(ACRES) = 4.26 AREA-AVERAGED Fm(INCH/HR) = 0.28 AREA-AVERAGED Fp(INCH/HR) = 0.74 AREA-AVERAGED Ap = 0.37 TOTAL AREA(ACRES) = 4.3 PEAK FLOW RATE(CFS) = 21.81
END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.47 HALFSTREET FLOOD WIDTH(FEET) = 15.42 FLOW VELOCITY(FEET/SEC.) = 8.50 DEPTH*VELOCITY(FT*FT/SEC.) = 3.96 LONGEST FLOWPATH FROM NODE 200.00 TO NODE 206.00 = 1809.00 FEET. **************************************************************************** Meyers Creek – Existing Condition 2024

Page 28 of 81 ends

FLOW PROCESS FROM NODE 206.00 TO NODE 207.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 6 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0600
STREET LENGTH(FEET) = 668.00 CURB HEIGHT(INCHES) = 8.0
STREET HALFWIDTH(FEET) = 19.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 14.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 25.45 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.51
HALFSTREET FLOOD WIDTH(FEET) = 17.55
AVERAGE FLOW VELOCITY(FEET/SEC.) = 7.78
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 3.96
STREET FLOW TRAVEL TIME(MIN.) = 1.43 Tc(MIN.) = 10.15
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 5.539
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.98 0.74 0.500 52

RESIDENTIAL
"5-7 DWELLINGS/ACRE" B 0.02 0.42 0.500 76
COMMERCIAL A 0.53 0.74 0.100 52
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.361
SUBAREA AREA(ACRES) = 1.54 SUBAREA RUNOFF(CFS) = 7.29
EFFECTIVE AREA(ACRES) = 5.79 AREA-AVERAGED Fm(INCH/HR) = 0.27 AREA-AVERAGED Fp(INCH/HR) = 0.74 AREA-AVERAGED Ap = 0.37 TOTAL AREA(ACRES) = 5.8 PEAK FLOW RATE(CFS) = 27.45
END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.52 HALFSTREET FLOOD WIDTH(FEET) = 18.10 FLOW VELOCITY(FEET/SEC.) = 7.92 DEPTH*VELOCITY(FT*FT/SEC.) = 4.12 LONGEST FLOWPATH FROM NODE 200.00 TO NODE 207.00 = 2477.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 207.00 TO NODE 208.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
Meyers Creek – Existing Condition 2024

Page 29 of 81 ends

>>>>>(STREET TABLE SECTION # 6 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0410
STREET LENGTH(FEET) = 664.00 CURB HEIGHT(INCHES) = 8.0
STREET HALFWIDTH(FEET) = 19.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 14.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 30.36 ***STREET FLOW SPLITS OVER STREET-CROWN***
FULL DEPTH(FEET) = 0.54 FLOOD WIDTH(FEET) = 19.00
FULL HALF-STREET VELOCITY(FEET/SEC.) = 6.72
SPLIT DEPTH(FEET) = 0.34 SPLIT FLOOD WIDTH(FEET) = 9.29 SPLIT FLOW(CFS) = 4.81 SPLIT VELOCITY(FEET/SEC.) = 4.57 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.54
HALFSTREET FLOOD WIDTH(FEET) = 19.00
AVERAGE FLOW VELOCITY(FEET/SEC.) = 6.72
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 3.62
STREET FLOW TRAVEL TIME(MIN.) = 1.65 Tc(MIN.) = 11.80
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 5.047
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.79 0.74 0.500 52

RESIDENTIAL
"5-7 DWELLINGS/ACRE" B 0.04 0.42 0.500 76
COMMERCIAL A 0.41 0.74 0.100 52
COMMERCIAL B 0.10 0.42 0.100 76
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.72
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.346
SUBAREA AREA(ACRES) = 1.35 SUBAREA RUNOFF(CFS) = 5.81
EFFECTIVE AREA(ACRES) = 7.14 AREA-AVERAGED Fm(INCH/HR) = 0.27 AREA-AVERAGED Fp(INCH/HR) = 0.74 AREA-AVERAGED Ap = 0.37 TOTAL AREA(ACRES) = 7.1 PEAK FLOW RATE(CFS) = 30.70
END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.54 HALFSTREET FLOOD WIDTH(FEET) = 19.00 FLOW VELOCITY(FEET/SEC.) = 6.72 DEPTH*VELOCITY(FT*FT/SEC.) = 3.62 LONGEST FLOWPATH FROM NODE 200.00 TO NODE 208.00 = 3141.00 FEET. **************************************************************************** Meyers Creek – Existing Condition 2024

Page 30 of 81 ends

FLOW PROCESS FROM NODE 208.00 TO NODE 209.00 IS CODE = 31 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING COMPUTER-ESTIMATED PIPESIZE (NON-PRESSURE FLOW)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.1000
FLOW LENGTH(FEET) = 20.00 MANNING'S N = 0.013
DEPTH OF FLOW IN 18.0 INCH PIPE IS 14.4 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 20.32
ESTIMATED PIPE DIAMETER(INCH) = 18.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 30.70
PIPE TRAVEL TIME(MIN.) = 0.02 Tc(MIN.) = 11.81
LONGEST FLOWPATH FROM NODE 200.00 TO NODE 209.00 = 3161.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 109.00 TO NODE 109.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<<
>>>>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<<<<< ============================================================================ TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE:

TIME OF CONCENTRATION(MIN.) = 11.81
RAINFALL INTENSITY(INCH/HR) = 5.04
AREA-AVERAGED Fm(INCH/HR) = 0.27
AREA-AVERAGED Fp(INCH/HR) = 0.74
AREA-AVERAGED Ap = 0.37
EFFECTIVE STREAM AREA(ACRES) = 7.14
TOTAL STREAM AREA(ACRES) = 7.14
PEAK FLOW RATE(CFS) AT CONFLUENCE = 30.70
** CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 1418.39 11.89 5.020 0.25( 0.20) 0.80 322.0 600.00
1 1433.29 12.67 4.785 0.25( 0.20) 0.80 341.5 100.00
1 1492.17 16.75 3.968 0.24( 0.20) 0.82 437.2 500.00
1 1786.50 24.12 3.451 0.24( 0.20) 0.83 605.7 300.00
1 1789.06 24.48 3.426 0.24( 0.20) 0.83 610.9 400.00
2 30.70 11.81 5.042 0.74( 0.27) 0.37 7.1 200.00

Page 31 of 81 ends

4 1515.95 16.75 3.968 0.25( 0.20) 0.81 444.4 500.00
5 1806.97 24.12 3.451 0.24( 0.20) 0.83 612.8 300.00
6 1809.37 24.48 3.426 0.24( 0.20) 0.83 618.1 400.00
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 1809.37 Tc(MIN.) = 24.48
EFFECTIVE AREA(ACRES) = 618.08 AREA-AVERAGED Fm(INCH/HR) = 0.20 AREA-AVERAGED Fp(INCH/HR) = 0.24 AREA-AVERAGED Ap = 0.83 TOTAL AREA(ACRES) = 618.1
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 109.00 = 4023.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 109.00 TO NODE 110.00 IS CODE = 56 ---------------------------------------------------------------------------- >>>>>COMPUTE TRAPEZOIDAL CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 100.00 DOWNSTREAM(FEET) = 100.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 60.00 CHANNEL SLOPE = 0.0000 GIVEN CHANNEL BASE(FEET) = 12.00 CHANNEL FREEBOARD(FEET) = 1.0 "Z" FACTOR = 2.000 MANNING'S FACTOR = 0.030
*ESTIMATED CHANNEL HEIGHT(FEET) = 10.05
CHANNEL FLOW THRU SUBAREA(CFS) = 1809.37
FLOW VELOCITY(FEET/SEC.) = 6.64 FLOW DEPTH(FEET) = 9.05 TRAVEL TIME(MIN.) = 0.15 Tc(MIN.) = 24.63
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 110.00 = 4083.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 110.00 TO NODE 110.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 2 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 700.00 TO NODE 701.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
>>USE TIME-OF-CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< ============================================================================ INITIAL SUBAREA FLOW-LENGTH(FEET) = 990.00
ELEVATION DATA: UPSTREAM(FEET) = 2001.00 DOWNSTREAM(FEET) = 1888.00 Tc = K*[(LENGTH** 3.00)/(ELEVATION CHANGE)]**0.20
SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = 7.407
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.360
SUBAREA Tc AND LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS Tc
LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN (MIN.)

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 1.43 0.74 0.500 52 9.48
Meyers Creek – Existing Condition 2024

Page 32 of 81 ends

RESIDENTIAL
"5-7 DWELLINGS/ACRE" C 0.35 0.27 0.500 86 9.48
COMMERCIAL A 0.16 0.74 0.100 52 7.41
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.65
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.467
SUBAREA RUNOFF(CFS) = 10.57
TOTAL AREA(ACRES) = 1.94 PEAK FLOW RATE(CFS) = 10.57
**************************************************************************** FLOW PROCESS FROM NODE 701.00 TO NODE 702.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1888.00 DOWNSTREAM(FEET) = 1872.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 208.00 CHANNEL SLOPE = 0.0769 CHANNEL FLOW THRU SUBAREA(CFS) = 10.57
FLOW VELOCITY(FEET/SEC) = 7.03 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.49 Tc(MIN.) = 7.90
LONGEST FLOWPATH FROM NODE 700.00 TO NODE 702.00 = 1198.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 702.00 TO NODE 702.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 7.90
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.213
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.62 0.74 0.500 52

RESIDENTIAL
"5-7 DWELLINGS/ACRE" C 1.17 0.27 0.500 86
COMMERCIAL A 0.04 0.74 0.100 52
COMMERCIAL C 0.08 0.27 0.100 86
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.43
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.475
SUBAREA AREA(ACRES) = 1.91 SUBAREA RUNOFF(CFS) = 10.34
EFFECTIVE AREA(ACRES) = 3.85 AREA-AVERAGED Fm(INCH/HR) = 0.26 AREA-AVERAGED Fp(INCH/HR) = 0.54 AREA-AVERAGED Ap = 0.47 TOTAL AREA(ACRES) = 3.9 PEAK FLOW RATE(CFS) = 20.65
**************************************************************************** FLOW PROCESS FROM NODE 702.00 TO NODE 703.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ Meyers Creek – Existing Condition 2024

Page 33 of 81 ends

ELEVATION DATA: UPSTREAM(FEET) = 1872.00 DOWNSTREAM(FEET) = 1860.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 320.00 CHANNEL SLOPE = 0.0375 CHANNEL FLOW THRU SUBAREA(CFS) = 20.65
FLOW VELOCITY(FEET/SEC) = 5.85 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.91 Tc(MIN.) = 8.81
LONGEST FLOWPATH FROM NODE 700.00 TO NODE 703.00 = 1518.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 703.00 TO NODE 703.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 8.81
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 5.940
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 2.62 0.74 0.500 52

RESIDENTIAL
"5-7 DWELLINGS/ACRE" C 0.71 0.27 0.500 86
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.64
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA AREA(ACRES) = 3.33 SUBAREA RUNOFF(CFS) = 16.85
EFFECTIVE AREA(ACRES) = 7.18 AREA-AVERAGED Fm(INCH/HR) = 0.29 AREA-AVERAGED Fp(INCH/HR) = 0.59 AREA-AVERAGED Ap = 0.48 TOTAL AREA(ACRES) = 7.2 PEAK FLOW RATE(CFS) = 36.55
**************************************************************************** FLOW PROCESS FROM NODE 703.00 TO NODE 704.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1860.00 DOWNSTREAM(FEET) = 1858.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 134.00 CHANNEL SLOPE = 0.0149 CHANNEL FLOW THRU SUBAREA(CFS) = 36.55
FLOW VELOCITY(FEET/SEC) = 4.32 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.52 Tc(MIN.) = 9.33
LONGEST FLOWPATH FROM NODE 700.00 TO NODE 704.00 = 1652.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 704.00 TO NODE 704.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 9.33
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 5.786
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS
Meyers Creek – Existing Condition 2024

Page 34 of 81 ends

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 1.81 0.74 0.500 52

RESIDENTIAL
"5-7 DWELLINGS/ACRE" B 0.11 0.42 0.500 76
COMMERCIAL A 0.64 0.74 0.100 52
COMMERCIAL B 0.15 0.42 0.100 76
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.72
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.384
SUBAREA AREA(ACRES) = 2.71 SUBAREA RUNOFF(CFS) = 13.44
EFFECTIVE AREA(ACRES) = 9.89 AREA-AVERAGED Fm(INCH/HR) = 0.28 AREA-AVERAGED Fp(INCH/HR) = 0.62 AREA-AVERAGED Ap = 0.46 TOTAL AREA(ACRES) = 9.9 PEAK FLOW RATE(CFS) = 48.99
**************************************************************************** FLOW PROCESS FROM NODE 704.00 TO NODE 704.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 3 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 1100.00 TO NODE 1101.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
>>USE TIME-OF-CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< ============================================================================ INITIAL SUBAREA FLOW-LENGTH(FEET) = 270.00
ELEVATION DATA: UPSTREAM(FEET) = 1873.00 DOWNSTREAM(FEET) = 1866.00 Tc = K*[(LENGTH** 3.00)/(ELEVATION CHANGE)]**0.20
SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = 5.925
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.803
SUBAREA Tc AND LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS Tc
LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN (MIN.)
COMMERCIAL A 0.16 0.74 0.100 52 5.92
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.100
SUBAREA RUNOFF(CFS) = 0.95
TOTAL AREA(ACRES) = 0.16 PEAK FLOW RATE(CFS) = 0.95
**************************************************************************** FLOW PROCESS FROM NODE 1101.00 TO NODE 1102.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 2 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0110
STREET LENGTH(FEET) = 269.00 CURB HEIGHT(INCHES) = 6.0
STREET HALFWIDTH(FEET) = 18.00
Meyers Creek – Existing Condition 2024

Page 35 of 81 ends

DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 13.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 1.42 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.28
HALFSTREET FLOOD WIDTH(FEET) = 7.56
AVERAGE FLOW VELOCITY(FEET/SEC.) = 2.05
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 0.57
STREET FLOW TRAVEL TIME(MIN.) = 2.18 Tc(MIN.) = 8.11
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.151
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.01 0.74 0.500 52
SCHOOL A 0.01 0.74 0.600 52
COMMERCIAL A 0.15 0.74 0.100 52
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.152
SUBAREA AREA(ACRES) = 0.17 SUBAREA RUNOFF(CFS) = 0.93
EFFECTIVE AREA(ACRES) = 0.33 AREA-AVERAGED Fm(INCH/HR) = 0.09 AREA-AVERAGED Fp(INCH/HR) = 0.74 AREA-AVERAGED Ap = 0.13 TOTAL AREA(ACRES) = 0.3 PEAK FLOW RATE(CFS) = 1.79
END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.29 HALFSTREET FLOOD WIDTH(FEET) = 8.43
FLOW VELOCITY(FEET/SEC.) = 2.16 DEPTH*VELOCITY(FT*FT/SEC.) = 0.64 LONGEST FLOWPATH FROM NODE 1100.00 TO NODE 1102.00 = 539.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 1102.00 TO NODE 1103.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 2 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0100
STREET LENGTH(FEET) = 207.00 CURB HEIGHT(INCHES) = 6.0
STREET HALFWIDTH(FEET) = 18.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 13.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
Meyers Creek – Existing Condition 2024

Page 36 of 81 ends

SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 2.17 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.31
HALFSTREET FLOOD WIDTH(FEET) = 9.39
AVERAGE FLOW VELOCITY(FEET/SEC.) = 2.17
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 0.68
STREET FLOW TRAVEL TIME(MIN.) = 1.59 Tc(MIN.) = 9.70
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 5.675
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN
SCHOOL A 0.03 0.74 0.600 52
COMMERCIAL A 0.12 0.74 0.100 52
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.213
SUBAREA AREA(ACRES) = 0.15 SUBAREA RUNOFF(CFS) = 0.74
EFFECTIVE AREA(ACRES) = 0.48 AREA-AVERAGED Fm(INCH/HR) = 0.11 AREA-AVERAGED Fp(INCH/HR) = 0.74 AREA-AVERAGED Ap = 0.15 TOTAL AREA(ACRES) = 0.5 PEAK FLOW RATE(CFS) = 2.40
END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.32 HALFSTREET FLOOD WIDTH(FEET) = 9.80
FLOW VELOCITY(FEET/SEC.) = 2.22 DEPTH*VELOCITY(FT*FT/SEC.) = 0.72 LONGEST FLOWPATH FROM NODE 1100.00 TO NODE 1103.00 = 746.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 1103.00 TO NODE 1104.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 2 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0120
STREET LENGTH(FEET) = 173.00 CURB HEIGHT(INCHES) = 6.0
STREET HALFWIDTH(FEET) = 18.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 13.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 Meyers Creek – Existing Condition 2024

Page 37 of 81 ends

**TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 2.71 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.33
HALFSTREET FLOOD WIDTH(FEET) = 9.95
AVERAGE FLOW VELOCITY(FEET/SEC.) = 2.45
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 0.80
STREET FLOW TRAVEL TIME(MIN.) = 1.18 Tc(MIN.) = 10.88
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 5.322
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN
COMMERCIAL A 0.13 0.74 0.100 52
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.100
SUBAREA AREA(ACRES) = 0.13 SUBAREA RUNOFF(CFS) = 0.63
EFFECTIVE AREA(ACRES) = 0.61 AREA-AVERAGED Fm(INCH/HR) = 0.11 AREA-AVERAGED Fp(INCH/HR) = 0.74 AREA-AVERAGED Ap = 0.14 TOTAL AREA(ACRES) = 0.6 PEAK FLOW RATE(CFS) = 2.87
END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.33 HALFSTREET FLOOD WIDTH(FEET) = 10.21 FLOW VELOCITY(FEET/SEC.) = 2.48 DEPTH*VELOCITY(FT*FT/SEC.) = 0.82 LONGEST FLOWPATH FROM NODE 1100.00 TO NODE 1104.00 = 919.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 1104.00 TO NODE 1105.00 IS CODE = 31 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING COMPUTER-ESTIMATED PIPESIZE (NON-PRESSURE FLOW)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0440
FLOW LENGTH(FEET) = 40.00 MANNING'S N = 0.013
ESTIMATED PIPE DIAMETER(INCH) INCREASED TO 12.000
DEPTH OF FLOW IN 12.0 INCH PIPE IS 5.3 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 8.55
ESTIMATED PIPE DIAMETER(INCH) = 12.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 2.87
PIPE TRAVEL TIME(MIN.) = 0.08 Tc(MIN.) = 10.96
LONGEST FLOWPATH FROM NODE 1100.00 TO NODE 1105.00 = 959.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 1105.00 TO NODE 1105.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<<
============================================================================ TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE:

TIME OF CONCENTRATION(MIN.) = 10.96
RAINFALL INTENSITY(INCH/HR) = 5.30
AREA-AVERAGED Fm(INCH/HR) = 0.11
Meyers Creek – Existing Condition 2024

Page 38 of 81 ends

AREA-AVERAGED Fp(INCH/HR) = 0.74
AREA-AVERAGED Ap = 0.14
EFFECTIVE STREAM AREA(ACRES) = 0.61
TOTAL STREAM AREA(ACRES) = 0.61
PEAK FLOW RATE(CFS) AT CONFLUENCE = 2.87
**************************************************************************** FLOW PROCESS FROM NODE 1105.00 TO NODE 1105.00 IS CODE = 7 ---------------------------------------------------------------------------- >>>>>USER SPECIFIED HYDROLOGY INFORMATION AT NODE<<<<<
============================================================================ USER-SPECIFIED VALUES ARE AS FOLLOWS:

TC(MIN.) = 14.55 RAINFALL INTENSITY(INCH/HR) = 4.22
EFFECTIVE AREA(ACRES) = 134.79
TOTAL AREA(ACRES) = 134.79 PEAK FLOW RATE(CFS) = 513.97 AREA-AVERAGED Fm(INCH/HR) = 0.26 AREA-AVERAGED Fp(INCH/HR) = 0.28 AREA-AVERAGED Ap = 0.92
NOTE: EFFECTIVE AREA IS USED AS THE TOTAL CONTRIBUTING AREA FOR ALL CONFLUENCE ANALYSES.
**************************************************************************** FLOW PROCESS FROM NODE 1105.00 TO NODE 1105.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<<
>>>>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<<<<< ============================================================================ TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE:

TIME OF CONCENTRATION(MIN.) = 14.55
RAINFALL INTENSITY(INCH/HR) = 4.22
AREA-AVERAGED Fm(INCH/HR) = 0.26
AREA-AVERAGED Fp(INCH/HR) = 0.28
AREA-AVERAGED Ap = 0.92
EFFECTIVE STREAM AREA(ACRES) = 134.79
TOTAL STREAM AREA(ACRES) = 134.79
PEAK FLOW RATE(CFS) AT CONFLUENCE = 513.97
** CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 2.87 10.96 5.299 0.74( 0.11) 0.14 0.6 1100.00
2 513.97 14.55 4.225 0.28( 0.26) 0.92 134.8 1105.00

Page 39 of 81 ends

2 516.25 14.55 4.225 0.28( 0.26) 0.92 135.4 1105.00
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 516.25 Tc(MIN.) = 14.55
EFFECTIVE AREA(ACRES) = 135.40 AREA-AVERAGED Fm(INCH/HR) = 0.26 AREA-AVERAGED Fp(INCH/HR) = 0.28 AREA-AVERAGED Ap = 0.92 TOTAL AREA(ACRES) = 135.4
LONGEST FLOWPATH FROM NODE 1105.00 TO NODE 1105.00 = 3161.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 1105.00 TO NODE 1106.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0090
FLOW LENGTH(FEET) = 34.80 MANNING'S N = 0.013

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 41.08
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 48.00 NUMBER OF PIPES = 1
PIPE-FLOW(CFS) = 516.25
PIPE TRAVEL TIME(MIN.) = 0.01 Tc(MIN.) = 14.56
LONGEST FLOWPATH FROM NODE 1105.00 TO NODE 1106.00 = 3195.80 FEET. **************************************************************************** FLOW PROCESS FROM NODE 1106.00 TO NODE 704.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0068
FLOW LENGTH(FEET) = 416.81 MANNING'S N = 0.013

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 14.43
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 81.00 NUMBER OF PIPES = 1
PIPE-FLOW(CFS) = 516.25
PIPE TRAVEL TIME(MIN.) = 0.48 Tc(MIN.) = 15.05
LONGEST FLOWPATH FROM NODE 1105.00 TO NODE 704.00 = 3612.61 FEET. **************************************************************************** FLOW PROCESS FROM NODE 704.00 TO NODE 704.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 3 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
Meyers Creek – Existing Condition 2024

Page 40 of 81 ends

1 494.74 11.47 5.144 0.28( 0.26) 0.92 102.1 1100.00
2 516.25 15.05 4.087 0.28( 0.26) 0.92 135.4 1105.00
LONGEST FLOWPATH FROM NODE 1105.00 TO NODE 704.00 = 3612.61 FEET. ** MEMORY BANK # 3 CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 48.99 9.33 5.786 0.62( 0.28) 0.46 9.9 700.00
LONGEST FLOWPATH FROM NODE 700.00 TO NODE 704.00 = 1652.00 FEET. ** PEAK FLOW RATE TABLE **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 504.00 9.33 5.786 0.30( 0.26) 0.87 92.9 700.00
2 538.02 11.47 5.144 0.30( 0.26) 0.87 112.0 1100.00
3 550.11 15.05 4.087 0.29( 0.26) 0.89 145.3 1105.00
TOTAL AREA(ACRES) = 145.3
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 550.11 Tc(MIN.) = 15.046
EFFECTIVE AREA(ACRES) = 145.29 AREA-AVERAGED Fm(INCH/HR) = 0.26 AREA-AVERAGED Fp(INCH/HR) = 0.30 AREA-AVERAGED Ap = 0.87 TOTAL AREA(ACRES) = 145.3
LONGEST FLOWPATH FROM NODE 1105.00 TO NODE 704.00 = 3612.61 FEET. **************************************************************************** FLOW PROCESS FROM NODE 704.00 TO NODE 704.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 3 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 704.00 TO NODE 110.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0060
FLOW LENGTH(FEET) = 284.58 MANNING'S N = 0.013

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 13.33
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 87.00 NUMBER OF PIPES = 1
PIPE-FLOW(CFS) = 550.11
PIPE TRAVEL TIME(MIN.) = 0.36 Tc(MIN.) = 15.40
LONGEST FLOWPATH FROM NODE 1105.00 TO NODE 110.00 = 3897.19 FEET. **************************************************************************** FLOW PROCESS FROM NODE 110.00 TO NODE 110.00 IS CODE = 11 ---------------------------------------------------------------------------- Meyers Creek – Existing Condition 2024

Page 41 of 81 ends

>>>>>CONFLUENCE MEMORY BANK # 2 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 504.00 9.66 5.686 0.30( 0.26) 0.87 92.9 700.00
2 538.02 11.84 5.035 0.30( 0.26) 0.87 112.0 1100.00
3 550.11 15.40 4.062 0.29( 0.26) 0.89 145.3 1105.00
LONGEST FLOWPATH FROM NODE 1105.00 TO NODE 110.00 = 3897.19 FEET. ** MEMORY BANK # 2 CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 1446.66 11.97 4.995 0.25( 0.20) 0.79 327.1 200.00
2 1448.94 12.05 4.972 0.25( 0.20) 0.79 329.2 600.00
3 1462.34 12.83 4.738 0.25( 0.20) 0.80 348.7 100.00
4 1515.95 16.91 3.957 0.25( 0.20) 0.81 444.4 500.00
5 1806.97 24.28 3.441 0.24( 0.20) 0.83 612.8 300.00
6 1809.37 24.63 3.416 0.24( 0.20) 0.83 618.1 400.00
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 110.00 = 4083.00 FEET. ** PEAK FLOW RATE TABLE **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 1839.62 9.66 5.686 0.27( 0.22) 0.81 356.8 700.00
2 1980.38 11.84 5.035 0.27( 0.22) 0.81 435.4 1100.00
3 1985.14 11.97 4.995 0.27( 0.22) 0.81 440.4 200.00
4 1987.69 12.05 4.972 0.27( 0.22) 0.81 443.1 600.00
5 2003.74 12.83 4.738 0.27( 0.22) 0.82 470.0 100.00
6 2046.26 15.40 4.062 0.26( 0.22) 0.83 554.3 1105.00
7 2050.84 16.91 3.957 0.26( 0.21) 0.83 589.7 500.00
8 2267.23 24.28 3.441 0.25( 0.21) 0.84 758.1 300.00
9 2266.04 24.63 3.416 0.25( 0.21) 0.84 763.4 400.00
TOTAL AREA(ACRES) = 763.4
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 2267.23 Tc(MIN.) = 24.275
EFFECTIVE AREA(ACRES) = 758.09 AREA-AVERAGED Fm(INCH/HR) = 0.21 AREA-AVERAGED Fp(INCH/HR) = 0.25 AREA-AVERAGED Ap = 0.84 TOTAL AREA(ACRES) = 763.4
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 110.00 = 4083.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 110.00 TO NODE 110.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 2 <<<<<
============================================================================ **************************************************************************** Meyers Creek – Existing Condition 2024

Page 42 of 81 ends

FLOW PROCESS FROM NODE 110.00 TO NODE 111.00 IS CODE = 51 ---------------------------------------------------------------------------- >>>>>COMPUTE TRAPEZOIDAL CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA (EXISTING ELEMENT)<<<<<
============================================================================ CHANNEL LENGTH THRU SUBAREA(FEET) = 571.00
REPRESENTATIVE CHANNEL SLOPE = 0.0230
CHANNEL BASE(FEET) = 11.00 "Z" FACTOR = 2.000
MANNING'S FACTOR = 0.035 MAXIMUM DEPTH(FEET) = 6.50
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 3.398
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.77 0.74 0.500 52
COMMERCIAL A 0.02 0.74 0.100 52

RESIDENTIAL
"5-7 DWELLINGS/ACRE" B 0.05 0.42 0.500 76
COMMERCIAL B 0.01 0.42 0.100 76
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.72
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.486
TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 2268.39 TRAVEL TIME THRU SUBAREA BASED ON VELOCITY(FEET/SEC.) = 15.56 AVERAGE FLOW DEPTH(FEET) = 6.22 TRAVEL TIME(MIN.) = 0.61 Tc(MIN.) = 24.89
SUBAREA AREA(ACRES) = 0.85 SUBAREA RUNOFF(CFS) = 2.32
EFFECTIVE AREA(ACRES) = 758.93 AREA-AVERAGED Fm(INCH/HR) = 0.21 AREA-AVERAGED Fp(INCH/HR) = 0.25 AREA-AVERAGED Ap = 0.84 TOTAL AREA(ACRES) = 764.2 PEAK FLOW RATE(CFS) = 2267.23 NOTE: PEAK FLOW RATE DEFAULTED TO UPSTREAM VALUE
END OF SUBAREA CHANNEL FLOW HYDRAULICS:

DEPTH(FEET) = 6.22 FLOW VELOCITY(FEET/SEC.) = 15.55
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 111.00 = 4654.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 111.00 TO NODE 112.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0230
FLOW LENGTH(FEET) = 52.00 MANNING'S N = 0.013

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 160.37
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 36.00 NUMBER OF PIPES = 2
PIPE-FLOW(CFS) = 2267.23
PIPE TRAVEL TIME(MIN.) = 0.01 Tc(MIN.) = 24.89
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 112.00 = 4706.00 FEET.

Meyers Creek – Existing Condition 2024

Page 43 of 81 ends

**************************************************************************** FLOW PROCESS FROM NODE 112.00 TO NODE 113.00 IS CODE = 51 ---------------------------------------------------------------------------- >>>>>COMPUTE TRAPEZOIDAL CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA (EXISTING ELEMENT)<<<<<
============================================================================ CHANNEL LENGTH THRU SUBAREA(FEET) = 618.00
REPRESENTATIVE CHANNEL SLOPE = 0.0290
CHANNEL BASE(FEET) = 4.00 "Z" FACTOR = 2.000
MANNING'S FACTOR = 0.035 MAXIMUM DEPTH(FEET) = 6.20
==>>WARNING: FLOW IN CHANNEL EXCEEDS CHANNEL

CAPACITY( NORMAL DEPTH EQUAL TO SPECIFIED MAXIMUM
ALLOWABLE DEPTH).

AS AN APPROXIMATION, FLOWDEPTH IS SET AT MAXIMUM
ALLOWABLE DEPTH AND IS USED FOR TRAVELTIME CALCULATIONS. * 100 YEAR RAINFALL INTENSITY(INCH/HR) = 3.365
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.69 0.74 0.500 52
COMMERCIAL A 0.07 0.74 0.100 52
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.463
TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 2268.26 TRAVEL TIME THRU SUBAREA BASED ON VELOCITY(FEET/SEC.) = 22.31 AVERAGE FLOW DEPTH(FEET) = 6.20 TRAVEL TIME(MIN.) = 0.46 Tc(MIN.) = 25.35
SUBAREA AREA(ACRES) = 0.76 SUBAREA RUNOFF(CFS) = 2.06
EFFECTIVE AREA(ACRES) = 759.69 AREA-AVERAGED Fm(INCH/HR) = 0.21 AREA-AVERAGED Fp(INCH/HR) = 0.25 AREA-AVERAGED Ap = 0.84 TOTAL AREA(ACRES) = 765.0 PEAK FLOW RATE(CFS) = 2267.23 NOTE: PEAK FLOW RATE DEFAULTED TO UPSTREAM VALUE
==>>WARNING: FLOW IN CHANNEL EXCEEDS CHANNEL

CAPACITY( NORMAL DEPTH EQUAL TO SPECIFIED MAXIMUM
ALLOWABLE DEPTH).

AS AN APPROXIMATION, FLOWDEPTH IS SET AT MAXIMUM
ALLOWABLE DEPTH AND IS USED FOR TRAVELTIME CALCULATIONS.

END OF SUBAREA CHANNEL FLOW HYDRAULICS:

DEPTH(FEET) = 6.20 FLOW VELOCITY(FEET/SEC.) = 22.30
==>FLOWDEPTH EXCEEDS MAXIMUM ALLOWABLE DEPTH
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 113.00 = 5324.00 FEET.

Meyers Creek – Existing Condition 2024

Page 44 of 81 ends

**************************************************************************** FLOW PROCESS FROM NODE 113.00 TO NODE 113.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<<
============================================================================ TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE:

TIME OF CONCENTRATION(MIN.) = 25.35
RAINFALL INTENSITY(INCH/HR) = 3.37
AREA-AVERAGED Fm(INCH/HR) = 0.21
AREA-AVERAGED Fp(INCH/HR) = 0.25
AREA-AVERAGED Ap = 0.84
EFFECTIVE STREAM AREA(ACRES) = 759.69
TOTAL STREAM AREA(ACRES) = 764.98
PEAK FLOW RATE(CFS) AT CONFLUENCE = 2267.23
**************************************************************************** FLOW PROCESS FROM NODE 1300.00 TO NODE 1301.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
>>USE TIME-OF-CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< ============================================================================ INITIAL SUBAREA FLOW-LENGTH(FEET) = 462.00
ELEVATION DATA: UPSTREAM(FEET) = 1889.00 DOWNSTREAM(FEET) = 1858.00 Tc = K*[(LENGTH** 3.00)/(ELEVATION CHANGE)]**0.20
SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = 7.771
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.252
SUBAREA Tc AND LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS Tc
LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN (MIN.)

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 1.40 0.74 0.500 52 7.77
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA RUNOFF(CFS) = 7.42
TOTAL AREA(ACRES) = 1.40 PEAK FLOW RATE(CFS) = 7.42
**************************************************************************** FLOW PROCESS FROM NODE 1301.00 TO NODE 1302.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1858.00 DOWNSTREAM(FEET) = 1842.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 221.00 CHANNEL SLOPE = 0.0724 CHANNEL FLOW THRU SUBAREA(CFS) = 7.42
FLOW VELOCITY(FEET/SEC) = 6.24 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.59 Tc(MIN.) = 8.36
Meyers Creek – Existing Condition 2024

Page 45 of 81 ends

LONGEST FLOWPATH FROM NODE 1300.00 TO NODE 1302.00 = 683.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 1302.00 TO NODE 1302.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 8.36
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.075
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.88 0.74 0.500 52

RESIDENTIAL
"5-7 DWELLINGS/ACRE" B 0.08 0.42 0.500 76
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.71
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA AREA(ACRES) = 0.96 SUBAREA RUNOFF(CFS) = 4.95
EFFECTIVE AREA(ACRES) = 2.36 AREA-AVERAGED Fm(INCH/HR) = 0.37 AREA-AVERAGED Fp(INCH/HR) = 0.73 AREA-AVERAGED Ap = 0.50 TOTAL AREA(ACRES) = 2.4 PEAK FLOW RATE(CFS) = 12.15
**************************************************************************** FLOW PROCESS FROM NODE 1302.00 TO NODE 1302.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 8.36
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.075
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.76 0.74 0.500 52

RESIDENTIAL
"5-7 DWELLINGS/ACRE" B 0.75 0.42 0.500 76
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.58
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA AREA(ACRES) = 1.51 SUBAREA RUNOFF(CFS) = 7.86
EFFECTIVE AREA(ACRES) = 3.87 AREA-AVERAGED Fm(INCH/HR) = 0.34 AREA-AVERAGED Fp(INCH/HR) = 0.67 AREA-AVERAGED Ap = 0.50 TOTAL AREA(ACRES) = 3.9 PEAK FLOW RATE(CFS) = 20.01
**************************************************************************** FLOW PROCESS FROM NODE 1302.00 TO NODE 113.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ Meyers Creek – Existing Condition 2024

Page 46 of 81 ends

ELEVATION DATA: UPSTREAM(FEET) = 1842.00 DOWNSTREAM(FEET) = 1814.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 849.00 CHANNEL SLOPE = 0.0330 CHANNEL FLOW THRU SUBAREA(CFS) = 20.01
FLOW VELOCITY(FEET/SEC) = 5.44 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 2.60 Tc(MIN.) = 10.96
LONGEST FLOWPATH FROM NODE 1300.00 TO NODE 113.00 = 1532.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 113.00 TO NODE 113.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 10.96
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 5.298
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.85 0.74 0.500 52

RESIDENTIAL
"5-7 DWELLINGS/ACRE" B 0.34 0.42 0.500 76
COMMERCIAL A 0.09 0.74 0.100 52
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.65
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.472
SUBAREA AREA(ACRES) = 1.27 SUBAREA RUNOFF(CFS) = 5.72
EFFECTIVE AREA(ACRES) = 5.15 AREA-AVERAGED Fm(INCH/HR) = 0.33 AREA-AVERAGED Fp(INCH/HR) = 0.67 AREA-AVERAGED Ap = 0.49 TOTAL AREA(ACRES) = 5.1 PEAK FLOW RATE(CFS) = 23.02
**************************************************************************** FLOW PROCESS FROM NODE 113.00 TO NODE 113.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<<
>>>>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<<<<< ============================================================================ TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE:

TIME OF CONCENTRATION(MIN.) = 10.96
RAINFALL INTENSITY(INCH/HR) = 5.30
AREA-AVERAGED Fm(INCH/HR) = 0.33
AREA-AVERAGED Fp(INCH/HR) = 0.67
AREA-AVERAGED Ap = 0.49
EFFECTIVE STREAM AREA(ACRES) = 5.15
TOTAL STREAM AREA(ACRES) = 5.15
PEAK FLOW RATE(CFS) AT CONFLUENCE = 23.02
** CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 1839.62 10.88 5.321 0.27( 0.22) 0.81 358.4 700.00
Meyers Creek – Existing Condition 2024

Page 47 of 81 ends

1 1980.38 13.01 4.686 0.27( 0.22) 0.81 437.0 1100.00
1 1985.14 13.14 4.646 0.27( 0.22) 0.81 442.0 200.00
1 1987.69 13.22 4.623 0.27( 0.22) 0.81 444.8 600.00
1 2003.74 13.99 4.391 0.27( 0.22) 0.82 471.6 100.00
1 2046.26 16.55 3.982 0.26( 0.22) 0.82 555.9 1105.00
1 2050.84 18.05 3.877 0.26( 0.21) 0.83 591.3 500.00
1 2267.23 25.35 3.365 0.25( 0.21) 0.84 759.7 300.00
1 2266.04 25.71 3.340 0.25( 0.21) 0.84 765.0 400.00
2 23.02 10.96 5.298 0.67( 0.33) 0.49 5.1 1300.00

PEAK FLOW RATE(CFS) = 2281.30 Tc(MIN.) = 25.35
EFFECTIVE AREA(ACRES) = 764.84 AREA-AVERAGED Fm(INCH/HR) = 0.21 AREA-AVERAGED Fp(INCH/HR) = 0.25 AREA-AVERAGED Ap = 0.83 TOTAL AREA(ACRES) = 770.1
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 113.00 = 5324.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 113.00 TO NODE 114.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1814.00 DOWNSTREAM(FEET) = 1790.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 687.00 CHANNEL SLOPE = 0.0349 CHANNEL FLOW THRU SUBAREA(CFS) = 2281.30
FLOW VELOCITY(FEET/SEC) = 24.05 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.48 Tc(MIN.) = 25.83
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 114.00 = 6011.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 114.00 TO NODE 114.00 IS CODE = 81 ---------------------------------------------------------------------------- Meyers Creek – Existing Condition 2024

Page 48 of 81 ends

>>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 25.83
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 3.332
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 2.09 0.74 0.500 52

NATURAL GOOD COVER
"MEADOWS" A 0.02 0.77 1.000 50
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.505
SUBAREA AREA(ACRES) = 2.11 SUBAREA RUNOFF(CFS) = 5.61
EFFECTIVE AREA(ACRES) = 766.95 AREA-AVERAGED Fm(INCH/HR) = 0.21 AREA-AVERAGED Fp(INCH/HR) = 0.25 AREA-AVERAGED Ap = 0.83 TOTAL AREA(ACRES) = 772.2 PEAK FLOW RATE(CFS) = 2281.30 NOTE: PEAK FLOW RATE DEFAULTED TO UPSTREAM VALUE
**************************************************************************** FLOW PROCESS FROM NODE 114.00 TO NODE 114.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 1 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 1400.00 TO NODE 1401.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
>>USE TIME-OF-CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< ============================================================================ INITIAL SUBAREA FLOW-LENGTH(FEET) = 481.00
ELEVATION DATA: UPSTREAM(FEET) = 1842.00 DOWNSTREAM(FEET) = 1826.00 Tc = K*[(LENGTH** 3.00)/(ELEVATION CHANGE)]**0.20
SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = 7.101
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.452
SUBAREA Tc AND LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS Tc
LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN (MIN.)

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.55 0.74 0.500 52 9.09

RESIDENTIAL
"5-7 DWELLINGS/ACRE" B 0.05 0.42 0.500 76 9.09
COMMERCIAL A 0.08 0.74 0.100 52 7.10
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.72
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.451
SUBAREA RUNOFF(CFS) = 3.80
TOTAL AREA(ACRES) = 0.69 PEAK FLOW RATE(CFS) = 3.80
Meyers Creek – Existing Condition 2024

Page 49 of 81 ends

**************************************************************************** FLOW PROCESS FROM NODE 1401.00 TO NODE 1402.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1826.00 DOWNSTREAM(FEET) = 1803.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 714.00 CHANNEL SLOPE = 0.0322 CHANNEL FLOW THRU SUBAREA(CFS) = 3.80
FLOW VELOCITY(FEET/SEC) = 3.55 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 3.35 Tc(MIN.) = 10.45
LONGEST FLOWPATH FROM NODE 1400.00 TO NODE 1402.00 = 1195.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 1402.00 TO NODE 1402.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 10.45
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 5.450
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 1.31 0.74 0.500 52
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA AREA(ACRES) = 1.31 SUBAREA RUNOFF(CFS) = 6.00
EFFECTIVE AREA(ACRES) = 2.00 AREA-AVERAGED Fm(INCH/HR) = 0.35 AREA-AVERAGED Fp(INCH/HR) = 0.73 AREA-AVERAGED Ap = 0.48 TOTAL AREA(ACRES) = 2.0 PEAK FLOW RATE(CFS) = 9.17
**************************************************************************** FLOW PROCESS FROM NODE 1402.00 TO NODE 1403.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1803.00 DOWNSTREAM(FEET) = 1798.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 177.00 CHANNEL SLOPE = 0.0282 CHANNEL FLOW THRU SUBAREA(CFS) = 9.17
FLOW VELOCITY(FEET/SEC) = 4.11 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.72 Tc(MIN.) = 11.17
LONGEST FLOWPATH FROM NODE 1400.00 TO NODE 1403.00 = 1372.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 1403.00 TO NODE 1403.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ Meyers Creek – Existing Condition 2024

Page 50 of 81 ends

MAINLINE Tc(MIN.) = 11.17
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 5.236
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.79 0.74 0.500 52
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA AREA(ACRES) = 0.79 SUBAREA RUNOFF(CFS) = 3.45
EFFECTIVE AREA(ACRES) = 2.79 AREA-AVERAGED Fm(INCH/HR) = 0.36 AREA-AVERAGED Fp(INCH/HR) = 0.74 AREA-AVERAGED Ap = 0.49 TOTAL AREA(ACRES) = 2.8 PEAK FLOW RATE(CFS) = 12.24
**************************************************************************** FLOW PROCESS FROM NODE 1403.00 TO NODE 1403.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<<
============================================================================ TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE:

TIME OF CONCENTRATION(MIN.) = 11.17
RAINFALL INTENSITY(INCH/HR) = 5.24
AREA-AVERAGED Fm(INCH/HR) = 0.36
AREA-AVERAGED Fp(INCH/HR) = 0.74
AREA-AVERAGED Ap = 0.49
EFFECTIVE STREAM AREA(ACRES) = 2.79
TOTAL STREAM AREA(ACRES) = 2.79
PEAK FLOW RATE(CFS) AT CONFLUENCE = 12.24
**************************************************************************** FLOW PROCESS FROM NODE 1500.00 TO NODE 1501.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
>>USE TIME-OF-CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< ============================================================================ INITIAL SUBAREA FLOW-LENGTH(FEET) = 489.00
ELEVATION DATA: UPSTREAM(FEET) = 1827.00 DOWNSTREAM(FEET) = 1810.00 Tc = K*[(LENGTH** 3.00)/(ELEVATION CHANGE)]**0.20
SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = 9.067
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 5.864
SUBAREA Tc AND LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS Tc
LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN (MIN.)

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 1.38 0.74 0.500 52 9.07
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA RUNOFF(CFS) = 6.85
Meyers Creek – Existing Condition 2024

Page 51 of 81 ends

TOTAL AREA(ACRES) = 1.38 PEAK FLOW RATE(CFS) = 6.85
**************************************************************************** FLOW PROCESS FROM NODE 1501.00 TO NODE 1403.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1810.00 DOWNSTREAM(FEET) = 1798.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 501.00 CHANNEL SLOPE = 0.0240 CHANNEL FLOW THRU SUBAREA(CFS) = 6.85
FLOW VELOCITY(FEET/SEC) = 3.52 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 2.37 Tc(MIN.) = 11.44
LONGEST FLOWPATH FROM NODE 1500.00 TO NODE 1403.00 = 990.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 1403.00 TO NODE 1403.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 11.44
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 5.155
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.68 0.74 0.500 52

NATURAL GOOD COVER
"MEADOWS" A 0.04 0.77 1.000 50
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.528
SUBAREA AREA(ACRES) = 0.72 SUBAREA RUNOFF(CFS) = 3.10
EFFECTIVE AREA(ACRES) = 2.11 AREA-AVERAGED Fm(INCH/HR) = 0.38 AREA-AVERAGED Fp(INCH/HR) = 0.74 AREA-AVERAGED Ap = 0.51 TOTAL AREA(ACRES) = 2.1 PEAK FLOW RATE(CFS) = 9.07
**************************************************************************** FLOW PROCESS FROM NODE 1403.00 TO NODE 1403.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<<
>>>>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<<<<< ============================================================================ TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE:

TIME OF CONCENTRATION(MIN.) = 11.44
RAINFALL INTENSITY(INCH/HR) = 5.15
AREA-AVERAGED Fm(INCH/HR) = 0.38
AREA-AVERAGED Fp(INCH/HR) = 0.74
AREA-AVERAGED Ap = 0.51
EFFECTIVE STREAM AREA(ACRES) = 2.11
Meyers Creek – Existing Condition 2024

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TOTAL STREAM AREA(ACRES) = 2.11
PEAK FLOW RATE(CFS) AT CONFLUENCE = 9.07
** CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 12.24 11.17 5.236 0.74( 0.36) 0.49 2.8 1400.00
2 9.07 11.44 5.155 0.74( 0.38) 0.51 2.1 1500.00

RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO
CONFLUENCE FORMULA USED FOR 2 STREAMS.
** PEAK FLOW RATE TABLE **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 21.24 11.17 5.236 0.74( 0.37) 0.50 4.8 1400.00
2 21.10 11.44 5.155 0.74( 0.37) 0.50 4.9 1500.00
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 21.24 Tc(MIN.) = 11.17
EFFECTIVE AREA(ACRES) = 4.85 AREA-AVERAGED Fm(INCH/HR) = 0.37 AREA-AVERAGED Fp(INCH/HR) = 0.74 AREA-AVERAGED Ap = 0.50 TOTAL AREA(ACRES) = 4.9
LONGEST FLOWPATH FROM NODE 1400.00 TO NODE 1403.00 = 1372.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 1403.00 TO NODE 114.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1798.00 DOWNSTREAM(FEET) = 1790.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 160.00 CHANNEL SLOPE = 0.0500 CHANNEL FLOW THRU SUBAREA(CFS) = 21.24
FLOW VELOCITY(FEET/SEC) = 6.81 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.39 Tc(MIN.) = 11.56
LONGEST FLOWPATH FROM NODE 1400.00 TO NODE 114.00 = 1532.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 114.00 TO NODE 114.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 11.56
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 5.118
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.17 0.74 0.500 52
Meyers Creek – Existing Condition 2024

Page 53 of 81 ends

NATURAL GOOD COVER
"MEADOWS" A 0.04 0.77 1.000 50
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.75
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.591
SUBAREA AREA(ACRES) = 0.21 SUBAREA RUNOFF(CFS) = 0.88
EFFECTIVE AREA(ACRES) = 5.06 AREA-AVERAGED Fm(INCH/HR) = 0.37 AREA-AVERAGED Fp(INCH/HR) = 0.74 AREA-AVERAGED Ap = 0.50 TOTAL AREA(ACRES) = 5.1 PEAK FLOW RATE(CFS) = 21.61
**************************************************************************** FLOW PROCESS FROM NODE 114.00 TO NODE 114.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 1 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 21.61 11.56 5.118 0.74( 0.37) 0.50 5.1 1400.00
2 21.45 11.83 5.038 0.74( 0.37) 0.50 5.1 1500.00
LONGEST FLOWPATH FROM NODE 1400.00 TO NODE 114.00 = 1532.00 FEET. ** MEMORY BANK # 1 CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 1862.58 11.39 5.169 0.27( 0.22) 0.80 365.6 700.00
2 1867.84 11.47 5.146 0.27( 0.22) 0.80 368.6 1300.00
3 2000.56 13.50 4.537 0.27( 0.22) 0.81 444.2 1100.00
4 2005.14 13.64 4.497 0.27( 0.22) 0.81 449.2 200.00
5 2007.58 13.71 4.475 0.27( 0.22) 0.81 452.0 600.00
6 2022.55 14.49 4.243 0.27( 0.22) 0.81 478.9 100.00
7 2063.18 17.04 3.947 0.27( 0.22) 0.82 563.2 1105.00
8 2067.27 18.54 3.842 0.26( 0.22) 0.82 598.5 500.00
9 2281.30 25.83 3.332 0.25( 0.21) 0.83 766.9 300.00
10 2279.99 26.19 3.307 0.25( 0.21) 0.83 772.2 400.00
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 114.00 = 6011.00 FEET. ** PEAK FLOW RATE TABLE **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 1884.10 11.39 5.169 0.28( 0.22) 0.80 370.6 700.00
2 1889.40 11.47 5.146 0.28( 0.22) 0.80 373.6 1300.00
3 1895.36 11.56 5.118 0.28( 0.22) 0.80 377.0 1400.00
4 1912.85 11.83 5.038 0.28( 0.22) 0.80 387.1 1500.00
5 2019.71 13.50 4.537 0.27( 0.22) 0.80 449.3 1100.00
6 2024.10 13.64 4.497 0.27( 0.22) 0.80 454.3 200.00
7 2026.44 13.71 4.475 0.27( 0.22) 0.80 457.1 600.00
8 2040.35 14.49 4.243 0.27( 0.22) 0.81 484.0 100.00
9 2079.62 17.04 3.947 0.27( 0.22) 0.82 568.3 1105.00
10 2083.22 18.54 3.842 0.27( 0.22) 0.82 603.6 500.00
Meyers Creek – Existing Condition 2024

Page 54 of 81 ends

11 2294.90 25.83 3.332 0.25( 0.21) 0.83 772.1 300.00
12 2293.48 26.19 3.307 0.25( 0.21) 0.83 777.3 400.00
TOTAL AREA(ACRES) = 777.3
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 2294.90 Tc(MIN.) = 25.831
EFFECTIVE AREA(ACRES) = 772.05 AREA-AVERAGED Fm(INCH/HR) = 0.21 AREA-AVERAGED Fp(INCH/HR) = 0.25 AREA-AVERAGED Ap = 0.83 TOTAL AREA(ACRES) = 777.3
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 114.00 = 6011.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 114.00 TO NODE 114.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 1 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 114.00 TO NODE 115.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1790.00 DOWNSTREAM(FEET) = 1780.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 418.00 CHANNEL SLOPE = 0.0239 CHANNEL FLOW THRU SUBAREA(CFS) = 2294.90
FLOW VELOCITY(FEET/SEC) = 19.94 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.35 Tc(MIN.) = 26.18
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 115.00 = 6429.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 115.00 TO NODE 115.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 26.18
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 3.307
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

NATURAL GOOD COVER
"MEADOWS" A 0.46 0.77 1.000 50
COMMERCIAL A 0.01 0.74 0.100 52
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.77
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.981
SUBAREA AREA(ACRES) = 0.47 SUBAREA RUNOFF(CFS) = 1.07
EFFECTIVE AREA(ACRES) = 772.52 AREA-AVERAGED Fm(INCH/HR) = 0.21 AREA-AVERAGED Fp(INCH/HR) = 0.26 AREA-AVERAGED Ap = 0.83 TOTAL AREA(ACRES) = 777.8 PEAK FLOW RATE(CFS) = 2294.90 NOTE: PEAK FLOW RATE DEFAULTED TO UPSTREAM VALUE
Meyers Creek – Existing Condition 2024

Page 55 of 81 ends

**************************************************************************** FLOW PROCESS FROM NODE 115.00 TO NODE 115.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<<
============================================================================ TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE:

TIME OF CONCENTRATION(MIN.) = 26.18
RAINFALL INTENSITY(INCH/HR) = 3.31
AREA-AVERAGED Fm(INCH/HR) = 0.21
AREA-AVERAGED Fp(INCH/HR) = 0.26
AREA-AVERAGED Ap = 0.83
EFFECTIVE STREAM AREA(ACRES) = 772.52
TOTAL STREAM AREA(ACRES) = 777.81
PEAK FLOW RATE(CFS) AT CONFLUENCE = 2294.90
**************************************************************************** FLOW PROCESS FROM NODE 1600.00 TO NODE 1601.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
>>USE TIME-OF-CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< ============================================================================ INITIAL SUBAREA FLOW-LENGTH(FEET) = 481.00
ELEVATION DATA: UPSTREAM(FEET) = 1836.00 DOWNSTREAM(FEET) = 1814.00 Tc = K*[(LENGTH** 3.00)/(ELEVATION CHANGE)]**0.20
SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = 8.526
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.026
SUBAREA Tc AND LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS Tc
LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN (MIN.)

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 1.07 0.74 0.500 52 8.53
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA RUNOFF(CFS) = 5.46
TOTAL AREA(ACRES) = 1.07 PEAK FLOW RATE(CFS) = 5.46
**************************************************************************** FLOW PROCESS FROM NODE 1601.00 TO NODE 1602.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1814.00 DOWNSTREAM(FEET) = 1800.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 415.00 CHANNEL SLOPE = 0.0337 CHANNEL FLOW THRU SUBAREA(CFS) = 5.46
FLOW VELOCITY(FEET/SEC) = 3.96 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 1.75 Tc(MIN.) = 10.27
Meyers Creek – Existing Condition 2024

Page 56 of 81 ends

LONGEST FLOWPATH FROM NODE 1600.00 TO NODE 1602.00 = 896.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 1602.00 TO NODE 1602.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 10.27
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 5.503
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 1.36 0.74 0.500 52
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA AREA(ACRES) = 1.36 SUBAREA RUNOFF(CFS) = 6.27
EFFECTIVE AREA(ACRES) = 2.43 AREA-AVERAGED Fm(INCH/HR) = 0.37 AREA-AVERAGED Fp(INCH/HR) = 0.74 AREA-AVERAGED Ap = 0.50 TOTAL AREA(ACRES) = 2.4 PEAK FLOW RATE(CFS) = 11.22
**************************************************************************** FLOW PROCESS FROM NODE 1602.00 TO NODE 115.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1800.00 DOWNSTREAM(FEET) = 1780.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 629.00 CHANNEL SLOPE = 0.0318 CHANNEL FLOW THRU SUBAREA(CFS) = 11.22
FLOW VELOCITY(FEET/SEC) = 4.59 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 2.28 Tc(MIN.) = 12.56
LONGEST FLOWPATH FROM NODE 1600.00 TO NODE 115.00 = 1525.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 115.00 TO NODE 115.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 12.56
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 4.820
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 1.80 0.74 0.500 52

NATURAL GOOD COVER
"MEADOWS" A 0.60 0.77 1.000 50
COMMERCIAL A 0.03 0.74 0.100 52
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.75
Meyers Creek – Existing Condition 2024

Page 57 of 81 ends

SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.620
SUBAREA AREA(ACRES) = 2.42 SUBAREA RUNOFF(CFS) = 9.50
EFFECTIVE AREA(ACRES) = 4.85 AREA-AVERAGED Fm(INCH/HR) = 0.42 AREA-AVERAGED Fp(INCH/HR) = 0.75 AREA-AVERAGED Ap = 0.56 TOTAL AREA(ACRES) = 4.9 PEAK FLOW RATE(CFS) = 19.23
**************************************************************************** FLOW PROCESS FROM NODE 115.00 TO NODE 115.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<<
>>>>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<<<<< ============================================================================ TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE:

TIME OF CONCENTRATION(MIN.) = 12.56
RAINFALL INTENSITY(INCH/HR) = 4.82
AREA-AVERAGED Fm(INCH/HR) = 0.42
AREA-AVERAGED Fp(INCH/HR) = 0.75
AREA-AVERAGED Ap = 0.56
EFFECTIVE STREAM AREA(ACRES) = 4.85
TOTAL STREAM AREA(ACRES) = 4.85
PEAK FLOW RATE(CFS) AT CONFLUENCE = 19.23
** CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 1884.10 11.76 5.057 0.28( 0.22) 0.80 371.1 700.00
1 1889.40 11.84 5.034 0.28( 0.22) 0.80 374.1 1300.00
1 1895.36 11.93 5.007 0.28( 0.22) 0.80 377.5 1400.00
1 1912.85 12.20 4.927 0.28( 0.22) 0.80 387.6 1500.00
1 2019.71 13.87 4.428 0.28( 0.22) 0.80 449.8 1100.00
1 2024.10 14.00 4.388 0.27( 0.22) 0.80 454.8 200.00
1 2026.44 14.08 4.366 0.27( 0.22) 0.80 457.6 600.00
1 2040.35 14.85 4.134 0.27( 0.22) 0.81 484.4 100.00
1 2079.62 17.40 3.922 0.27( 0.22) 0.82 568.8 1105.00
1 2083.22 18.90 3.817 0.27( 0.22) 0.82 604.1 500.00
1 2294.90 26.18 3.307 0.26( 0.21) 0.83 772.5 300.00
1 2293.48 26.54 3.283 0.25( 0.21) 0.83 777.8 400.00
2 19.23 12.56 4.820 0.75( 0.42) 0.56 4.9 1600.00

Page 58 of 81 ends

5 1954.96 12.56 4.820 0.28( 0.22) 0.80 405.8 1600.00
6 2037.23 13.87 4.428 0.28( 0.22) 0.80 454.7 1100.00
7 2041.45 14.00 4.388 0.28( 0.22) 0.80 459.7 200.00
8 2043.68 14.08 4.366 0.28( 0.22) 0.80 462.4 600.00
9 2056.58 14.85 4.134 0.28( 0.22) 0.80 489.3 100.00
10 2094.92 17.40 3.922 0.27( 0.22) 0.82 573.6 1105.00
11 2098.07 18.90 3.817 0.27( 0.22) 0.82 609.0 500.00
12 2307.52 26.18 3.307 0.26( 0.21) 0.83 777.4 300.00
13 2305.99 26.54 3.283 0.26( 0.21) 0.83 782.7 400.00
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 2307.52 Tc(MIN.) = 26.18
EFFECTIVE AREA(ACRES) = 777.37 AREA-AVERAGED Fm(INCH/HR) = 0.21 AREA-AVERAGED Fp(INCH/HR) = 0.26 AREA-AVERAGED Ap = 0.83 TOTAL AREA(ACRES) = 782.7
LONGEST FLOWPATH FROM NODE 400.00 TO NODE 115.00 = 6429.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 115.00 TO NODE 115.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 1 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 800.00 TO NODE 801.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
>>USE TIME-OF-CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< ============================================================================ INITIAL SUBAREA FLOW-LENGTH(FEET) = 294.00
ELEVATION DATA: UPSTREAM(FEET) = 1924.00 DOWNSTREAM(FEET) = 1887.00 Tc = K*[(LENGTH** 3.00)/(ELEVATION CHANGE)]**0.20
SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = 5.719
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.865
SUBAREA Tc AND LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS Tc
LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN (MIN.)

RESIDENTIAL
"5-7 DWELLINGS/ACRE" C 0.53 0.27 0.500 86 5.72
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.27
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA RUNOFF(CFS) = 3.23
TOTAL AREA(ACRES) = 0.53 PEAK FLOW RATE(CFS) = 3.23
**************************************************************************** FLOW PROCESS FROM NODE 801.00 TO NODE 802.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
Meyers Creek – Existing Condition 2024

Page 59 of 81 ends

============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1887.00 DOWNSTREAM(FEET) = 1880.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 178.00 CHANNEL SLOPE = 0.0393 CHANNEL FLOW THRU SUBAREA(CFS) = 3.23
FLOW VELOCITY(FEET/SEC) = 3.78 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.78 Tc(MIN.) = 6.50
LONGEST FLOWPATH FROM NODE 800.00 TO NODE 802.00 = 472.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 802.00 TO NODE 802.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 6.50
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.631
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" C 0.94 0.27 0.500 86
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.27
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA AREA(ACRES) = 0.94 SUBAREA RUNOFF(CFS) = 5.51
EFFECTIVE AREA(ACRES) = 1.47 AREA-AVERAGED Fm(INCH/HR) = 0.14 AREA-AVERAGED Fp(INCH/HR) = 0.27 AREA-AVERAGED Ap = 0.50 TOTAL AREA(ACRES) = 1.5 PEAK FLOW RATE(CFS) = 8.62
**************************************************************************** FLOW PROCESS FROM NODE 802.00 TO NODE 803.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1880.00 DOWNSTREAM(FEET) = 1858.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 428.00 CHANNEL SLOPE = 0.0514 CHANNEL FLOW THRU SUBAREA(CFS) = 8.62
FLOW VELOCITY(FEET/SEC) = 5.46 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 1.31 Tc(MIN.) = 7.81
LONGEST FLOWPATH FROM NODE 800.00 TO NODE 803.00 = 900.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 803.00 TO NODE 803.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 7.81
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.240
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN
Meyers Creek – Existing Condition 2024

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RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.79 0.74 0.500 52
APARTMENTS C 0.92 0.27 0.200 86
COMMERCIAL A 0.02 0.74 0.100 52
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.59
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.336
SUBAREA AREA(ACRES) = 1.73 SUBAREA RUNOFF(CFS) = 9.39
EFFECTIVE AREA(ACRES) = 3.20 AREA-AVERAGED Fm(INCH/HR) = 0.17 AREA-AVERAGED Fp(INCH/HR) = 0.41 AREA-AVERAGED Ap = 0.41 TOTAL AREA(ACRES) = 3.2 PEAK FLOW RATE(CFS) = 17.50
**************************************************************************** FLOW PROCESS FROM NODE 803.00 TO NODE 804.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 3 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0050
STREET LENGTH(FEET) = 189.00 CURB HEIGHT(INCHES) = 8.0
STREET HALFWIDTH(FEET) = 25.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 20.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 20.90 ***STREET FLOW SPLITS OVER STREET-CROWN***
FULL DEPTH(FEET) = 0.66 FLOOD WIDTH(FEET) = 25.00
FULL HALF-STREET VELOCITY(FEET/SEC.) = 2.78
SPLIT DEPTH(FEET) = 0.40 SPLIT FLOOD WIDTH(FEET) = 12.07 SPLIT FLOW(CFS) = 2.97 SPLIT VELOCITY(FEET/SEC.) = 1.81 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.66
HALFSTREET FLOOD WIDTH(FEET) = 25.00
AVERAGE FLOW VELOCITY(FEET/SEC.) = 2.78
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 1.83
STREET FLOW TRAVEL TIME(MIN.) = 1.13 Tc(MIN.) = 8.94
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 5.902
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.98 0.74 0.500 52
COMMERCIAL A 0.37 0.74 0.100 52
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
Meyers Creek – Existing Condition 2024

Page 61 of 81 ends

SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.391
SUBAREA AREA(ACRES) = 1.35 SUBAREA RUNOFF(CFS) = 6.81
EFFECTIVE AREA(ACRES) = 4.55 AREA-AVERAGED Fm(INCH/HR) = 0.21 AREA-AVERAGED Fp(INCH/HR) = 0.51 AREA-AVERAGED Ap = 0.41 TOTAL AREA(ACRES) = 4.6 PEAK FLOW RATE(CFS) = 23.33
END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.66 HALFSTREET FLOOD WIDTH(FEET) = 25.00 FLOW VELOCITY(FEET/SEC.) = 2.78 DEPTH*VELOCITY(FT*FT/SEC.) = 1.83 LONGEST FLOWPATH FROM NODE 800.00 TO NODE 804.00 = 1089.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 804.00 TO NODE 805.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 5 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0370
STREET LENGTH(FEET) = 695.00 CURB HEIGHT(INCHES) = 8.0
STREET HALFWIDTH(FEET) = 22.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 17.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 27.89 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.56
HALFSTREET FLOOD WIDTH(FEET) = 20.11
AVERAGE FLOW VELOCITY(FEET/SEC.) = 6.59
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 3.69
STREET FLOW TRAVEL TIME(MIN.) = 1.76 Tc(MIN.) = 10.70
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 5.376
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 1.10 0.74 0.500 52
COMMERCIAL A 0.88 0.74 0.100 52
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.322
SUBAREA AREA(ACRES) = 1.97 SUBAREA RUNOFF(CFS) = 9.12
EFFECTIVE AREA(ACRES) = 6.52 AREA-AVERAGED Fm(INCH/HR) = 0.22 AREA-AVERAGED Fp(INCH/HR) = 0.57 AREA-AVERAGED Ap = 0.38 TOTAL AREA(ACRES) = 6.5 PEAK FLOW RATE(CFS) = 30.29
Meyers Creek – Existing Condition 2024

Page 62 of 81 ends

END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.57 HALFSTREET FLOOD WIDTH(FEET) = 20.77 FLOW VELOCITY(FEET/SEC.) = 6.73 DEPTH*VELOCITY(FT*FT/SEC.) = 3.86 LONGEST FLOWPATH FROM NODE 800.00 TO NODE 805.00 = 1784.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 805.00 TO NODE 805.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 2 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 900.00 TO NODE 901.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
>>USE TIME-OF-CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< ============================================================================ INITIAL SUBAREA FLOW-LENGTH(FEET) = 284.00
ELEVATION DATA: UPSTREAM(FEET) = 1863.00 DOWNSTREAM(FEET) = 1851.00 Tc = K*[(LENGTH** 3.00)/(ELEVATION CHANGE)]**0.20
SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = 5.483
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.936
SUBAREA Tc AND LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS Tc
LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN (MIN.)

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.43 0.74 0.500 52 7.02
COMMERCIAL A 0.01 0.74 0.100 52 5.48
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.491
SUBAREA RUNOFF(CFS) = 2.57
TOTAL AREA(ACRES) = 0.44 PEAK FLOW RATE(CFS) = 2.57
**************************************************************************** FLOW PROCESS FROM NODE 901.00 TO NODE 902.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1851.00 DOWNSTREAM(FEET) = 1843.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 194.00 CHANNEL SLOPE = 0.0412 CHANNEL FLOW THRU SUBAREA(CFS) = 2.57
FLOW VELOCITY(FEET/SEC) = 3.69 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.88 Tc(MIN.) = 6.36
LONGEST FLOWPATH FROM NODE 900.00 TO NODE 902.00 = 478.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 902.00 TO NODE 902.00 IS CODE = 81 Meyers Creek – Existing Condition 2024

Page 63 of 81 ends

---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 6.36
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.673
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.64 0.74 0.500 52
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA AREA(ACRES) = 0.64 SUBAREA RUNOFF(CFS) = 3.62
EFFECTIVE AREA(ACRES) = 1.07 AREA-AVERAGED Fm(INCH/HR) = 0.37 AREA-AVERAGED Fp(INCH/HR) = 0.74 AREA-AVERAGED Ap = 0.50 TOTAL AREA(ACRES) = 1.1 PEAK FLOW RATE(CFS) = 6.09
**************************************************************************** FLOW PROCESS FROM NODE 902.00 TO NODE 903.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1843.00 DOWNSTREAM(FEET) = 1838.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 128.00 CHANNEL SLOPE = 0.0391 CHANNEL FLOW THRU SUBAREA(CFS) = 6.09
FLOW VELOCITY(FEET/SEC) = 4.37 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.49 Tc(MIN.) = 6.85
LONGEST FLOWPATH FROM NODE 900.00 TO NODE 903.00 = 606.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 903.00 TO NODE 903.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 6.85
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.527
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.74 0.74 0.500 52
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
SUBAREA AREA(ACRES) = 0.74 SUBAREA RUNOFF(CFS) = 4.10
EFFECTIVE AREA(ACRES) = 1.81 AREA-AVERAGED Fm(INCH/HR) = 0.37 AREA-AVERAGED Fp(INCH/HR) = 0.74 AREA-AVERAGED Ap = 0.50 TOTAL AREA(ACRES) = 1.8 PEAK FLOW RATE(CFS) = 10.05
**************************************************************************** Meyers Creek – Existing Condition 2024

Page 64 of 81 ends

FLOW PROCESS FROM NODE 903.00 TO NODE 904.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1838.00 DOWNSTREAM(FEET) = 1834.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 173.00 CHANNEL SLOPE = 0.0231 CHANNEL FLOW THRU SUBAREA(CFS) = 10.05
FLOW VELOCITY(FEET/SEC) = 3.81 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.76 Tc(MIN.) = 7.61
LONGEST FLOWPATH FROM NODE 900.00 TO NODE 904.00 = 779.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 904.00 TO NODE 904.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 7.61
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.301
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 1.31 0.74 0.500 52
COMMERCIAL A 0.06 0.74 0.100 52
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.481
SUBAREA AREA(ACRES) = 1.37 SUBAREA RUNOFF(CFS) = 7.34
EFFECTIVE AREA(ACRES) = 3.19 AREA-AVERAGED Fm(INCH/HR) = 0.36 AREA-AVERAGED Fp(INCH/HR) = 0.74 AREA-AVERAGED Ap = 0.49 TOTAL AREA(ACRES) = 3.2 PEAK FLOW RATE(CFS) = 17.03
**************************************************************************** FLOW PROCESS FROM NODE 904.00 TO NODE 905.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1834.00 DOWNSTREAM(FEET) = 1832.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 63.00 CHANNEL SLOPE = 0.0317 CHANNEL FLOW THRU SUBAREA(CFS) = 17.03
FLOW VELOCITY(FEET/SEC) = 5.11 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 0.21 Tc(MIN.) = 7.81
LONGEST FLOWPATH FROM NODE 900.00 TO NODE 905.00 = 842.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 905.00 TO NODE 905.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ Meyers Creek – Existing Condition 2024

Page 65 of 81 ends

MAINLINE Tc(MIN.) = 7.81
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.239
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.61 0.74 0.500 52
COMMERCIAL A 0.24 0.74 0.100 52
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.386
SUBAREA AREA(ACRES) = 0.85 SUBAREA RUNOFF(CFS) = 4.54
EFFECTIVE AREA(ACRES) = 4.03 AREA-AVERAGED Fm(INCH/HR) = 0.35 AREA-AVERAGED Fp(INCH/HR) = 0.74 AREA-AVERAGED Ap = 0.47 TOTAL AREA(ACRES) = 4.0 PEAK FLOW RATE(CFS) = 21.39
**************************************************************************** FLOW PROCESS FROM NODE 905.00 TO NODE 905.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<<
============================================================================ TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE:

TIME OF CONCENTRATION(MIN.) = 7.81
RAINFALL INTENSITY(INCH/HR) = 6.24
AREA-AVERAGED Fm(INCH/HR) = 0.35
AREA-AVERAGED Fp(INCH/HR) = 0.74
AREA-AVERAGED Ap = 0.47
EFFECTIVE STREAM AREA(ACRES) = 4.03
TOTAL STREAM AREA(ACRES) = 4.03
PEAK FLOW RATE(CFS) AT CONFLUENCE = 21.39
**************************************************************************** FLOW PROCESS FROM NODE 1000.00 TO NODE 1001.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
>>USE TIME-OF-CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< ============================================================================ INITIAL SUBAREA FLOW-LENGTH(FEET) = 298.00
ELEVATION DATA: UPSTREAM(FEET) = 1859.00 DOWNSTREAM(FEET) = 1844.00 Tc = K*[(LENGTH** 3.00)/(ELEVATION CHANGE)]**0.20
SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = 6.907
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.510
SUBAREA Tc AND LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS Tc
LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN (MIN.)

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 0.86 0.74 0.500 52 6.91
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.500
Meyers Creek – Existing Condition 2024

Page 66 of 81 ends

SUBAREA RUNOFF(CFS) = 4.75
TOTAL AREA(ACRES) = 0.86 PEAK FLOW RATE(CFS) = 4.75
**************************************************************************** FLOW PROCESS FROM NODE 1001.00 TO NODE 905.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<<
>>>>>TRAVELTIME THRU SUBAREA<<<<<
============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 1844.00 DOWNSTREAM(FEET) = 1832.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 375.00 CHANNEL SLOPE = 0.0320 CHANNEL FLOW THRU SUBAREA(CFS) = 4.75
FLOW VELOCITY(FEET/SEC) = 3.73 (PER LACFCD/RCFC&WCD HYDROLOGY MANUAL) TRAVEL TIME(MIN.) = 1.68 Tc(MIN.) = 8.58
LONGEST FLOWPATH FROM NODE 1000.00 TO NODE 905.00 = 673.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 905.00 TO NODE 905.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ MAINLINE Tc(MIN.) = 8.58
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.009
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 1.09 0.74 0.500 52
COMMERCIAL A 0.01 0.74 0.100 52
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.495
SUBAREA AREA(ACRES) = 1.11 SUBAREA RUNOFF(CFS) = 5.62
EFFECTIVE AREA(ACRES) = 1.97 AREA-AVERAGED Fm(INCH/HR) = 0.37 AREA-AVERAGED Fp(INCH/HR) = 0.74 AREA-AVERAGED Ap = 0.50 TOTAL AREA(ACRES) = 2.0 PEAK FLOW RATE(CFS) = 9.98
**************************************************************************** FLOW PROCESS FROM NODE 905.00 TO NODE 905.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<<
>>>>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<<<<< ============================================================================ TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE:

TIME OF CONCENTRATION(MIN.) = 8.58
RAINFALL INTENSITY(INCH/HR) = 6.01
AREA-AVERAGED Fm(INCH/HR) = 0.37
AREA-AVERAGED Fp(INCH/HR) = 0.74
AREA-AVERAGED Ap = 0.50
EFFECTIVE STREAM AREA(ACRES) = 1.97
Meyers Creek – Existing Condition 2024

Page 67 of 81 ends

TOTAL STREAM AREA(ACRES) = 1.97
PEAK FLOW RATE(CFS) AT CONFLUENCE = 9.98
** CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 21.39 7.81 6.239 0.74( 0.35) 0.47 4.0 900.00
2 9.98 8.58 6.009 0.74( 0.37) 0.50 2.0 1000.00

RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO
CONFLUENCE FORMULA USED FOR 2 STREAMS.
** PEAK FLOW RATE TABLE **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 30.84 7.81 6.239 0.74( 0.35) 0.48 5.8 900.00
2 30.53 8.58 6.009 0.74( 0.35) 0.48 6.0 1000.00
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 30.84 Tc(MIN.) = 7.81
EFFECTIVE AREA(ACRES) = 5.82 AREA-AVERAGED Fm(INCH/HR) = 0.35 AREA-AVERAGED Fp(INCH/HR) = 0.74 AREA-AVERAGED Ap = 0.48 TOTAL AREA(ACRES) = 6.0
LONGEST FLOWPATH FROM NODE 900.00 TO NODE 905.00 = 842.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 905.00 TO NODE 805.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 2 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0100
STREET LENGTH(FEET) = 172.00 CURB HEIGHT(INCHES) = 6.0
STREET HALFWIDTH(FEET) = 18.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 13.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 2
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 30.87 ***STREET FLOWING FULL***
STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.53
HALFSTREET FLOOD WIDTH(FEET) = 18.66
AVERAGE FLOW VELOCITY(FEET/SEC.) = 3.66
Meyers Creek – Existing Condition 2024

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PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 1.95
STREET FLOW TRAVEL TIME(MIN.) = 0.78 Tc(MIN.) = 8.59
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.005
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN
COMMERCIAL A 0.01 0.74 0.100 52
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.100
SUBAREA AREA(ACRES) = 0.01 SUBAREA RUNOFF(CFS) = 0.05
EFFECTIVE AREA(ACRES) = 5.83 AREA-AVERAGED Fm(INCH/HR) = 0.35 AREA-AVERAGED Fp(INCH/HR) = 0.74 AREA-AVERAGED Ap = 0.48 TOTAL AREA(ACRES) = 6.0 PEAK FLOW RATE(CFS) = 30.84
NOTE: PEAK FLOW RATE DEFAULTED TO UPSTREAM VALUE
END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.53 HALFSTREET FLOOD WIDTH(FEET) = 18.64 FLOW VELOCITY(FEET/SEC.) = 3.68 DEPTH*VELOCITY(FT*FT/SEC.) = 1.96 LONGEST FLOWPATH FROM NODE 900.00 TO NODE 805.00 = 1014.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 805.00 TO NODE 805.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 2 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 30.84 8.59 6.005 0.74( 0.35) 0.48 5.8 900.00
2 30.53 9.37 5.775 0.74( 0.35) 0.48 6.0 1000.00
LONGEST FLOWPATH FROM NODE 900.00 TO NODE 805.00 = 1014.00 FEET. ** MEMORY BANK # 2 CONFLUENCE DATA **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 30.29 10.70 5.376 0.57( 0.22) 0.38 6.5 800.00
LONGEST FLOWPATH FROM NODE 800.00 TO NODE 805.00 = 1784.00 FEET. ** PEAK FLOW RATE TABLE **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 58.14 8.59 6.005 0.67( 0.29) 0.43 11.1 900.00
2 59.10 9.37 5.775 0.67( 0.29) 0.43 11.7 1000.00
3 58.58 10.70 5.376 0.66( 0.28) 0.43 12.5 800.00
TOTAL AREA(ACRES) = 12.5
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 59.10 Tc(MIN.) = 9.365
EFFECTIVE AREA(ACRES) = 11.72 AREA-AVERAGED Fm(INCH/HR) = 0.29 Meyers Creek – Existing Condition 2024

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AREA-AVERAGED Fp(INCH/HR) = 0.67 AREA-AVERAGED Ap = 0.43 TOTAL AREA(ACRES) = 12.5
LONGEST FLOWPATH FROM NODE 800.00 TO NODE 805.00 = 1784.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 805.00 TO NODE 805.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 2 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 805.00 TO NODE 806.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 3 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0370
STREET LENGTH(FEET) = 300.00 CURB HEIGHT(INCHES) = 8.0
STREET HALFWIDTH(FEET) = 25.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 20.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 64.75 ***STREET FLOW SPLITS OVER STREET-CROWN***
FULL DEPTH(FEET) = 0.66 FLOOD WIDTH(FEET) = 25.00
FULL HALF-STREET VELOCITY(FEET/SEC.) = 7.57
SPLIT DEPTH(FEET) = 0.48 SPLIT FLOOD WIDTH(FEET) = 16.05 SPLIT FLOW(CFS) = 15.98 SPLIT VELOCITY(FEET/SEC.) = 5.77 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.66
HALFSTREET FLOOD WIDTH(FEET) = 25.00
AVERAGE FLOW VELOCITY(FEET/SEC.) = 7.57
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 4.99
STREET FLOW TRAVEL TIME(MIN.) = 0.66 Tc(MIN.) = 10.03
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 5.577
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 1.91 0.74 0.500 52
COMMERCIAL A 0.47 0.74 0.100 52
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.421
Meyers Creek – Existing Condition 2024

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SUBAREA AREA(ACRES) = 2.38 SUBAREA RUNOFF(CFS) = 11.30
EFFECTIVE AREA(ACRES) = 14.10 AREA-AVERAGED Fm(INCH/HR) = 0.29 AREA-AVERAGED Fp(INCH/HR) = 0.68 AREA-AVERAGED Ap = 0.43 TOTAL AREA(ACRES) = 14.9 PEAK FLOW RATE(CFS) = 67.10
END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.66 HALFSTREET FLOOD WIDTH(FEET) = 25.00 FLOW VELOCITY(FEET/SEC.) = 7.57 DEPTH*VELOCITY(FT*FT/SEC.) = 4.99 LONGEST FLOWPATH FROM NODE 800.00 TO NODE 806.00 = 2084.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 806.00 TO NODE 807.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 6 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0330
STREET LENGTH(FEET) = 273.00 CURB HEIGHT(INCHES) = 8.0
STREET HALFWIDTH(FEET) = 19.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 14.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 71.41 ***STREET FLOWING FULL***
STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.60
HALFSTREET FLOOD WIDTH(FEET) = 19.00
AVERAGE FLOW VELOCITY(FEET/SEC.) = 7.18
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 4.31
STREET FLOW TRAVEL TIME(MIN.) = 0.63 Tc(MIN.) = 10.66
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 5.388
SUBAREA LOSS RATE DATA(AMC III):

DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS

LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN

RESIDENTIAL
"5-7 DWELLINGS/ACRE" A 1.72 0.74 0.500 52
COMMERCIAL A 0.18 0.74 0.100 52
SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.74
SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.462
SUBAREA AREA(ACRES) = 1.90 SUBAREA RUNOFF(CFS) = 8.61
EFFECTIVE AREA(ACRES) = 16.00 AREA-AVERAGED Fm(INCH/HR) = 0.30 AREA-AVERAGED Fp(INCH/HR) = 0.69 AREA-AVERAGED Ap = 0.43 TOTAL AREA(ACRES) = 16.8 PEAK FLOW RATE(CFS) = 73.31
Meyers Creek – Existing Condition 2024

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END OF SUBAREA STREET FLOW HYDRAULICS:

DEPTH(FEET) = 0.60 HALFSTREET FLOOD WIDTH(FEET) = 19.00 FLOW VELOCITY(FEET/SEC.) = 7.27 DEPTH*VELOCITY(FT*FT/SEC.) = 4.39 ** PEAK FLOW RATE TABLE **
STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER
NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE
1 73.52 9.89 5.619 0.69( 0.30) 0.43 15.4 900.00
2 73.31 10.66 5.388 0.69( 0.30) 0.43 16.0 1000.00
3 71.05 12.00 4.988 0.68( 0.29) 0.43 16.8 800.00
NEW PEAK FLOW DATA ARE:

PEAK FLOW RATE(CFS) = 73.52 Tc(MIN.) = 9.89
AREA-AVERAGED Fm(INCH/HR) = 0.30 AREA-AVERAGED Fp(INCH/HR) = 0.69 AREA-AVERAGED Ap = 0.43 EFFECTIVE AREA(ACRES) = 15.35
LONGEST FLOWPATH FROM NODE 800.00 TO NODE 807.00 = 2357.00 FEET. **************************************************************************** FLOW PROCESS FROM NODE 807.00 TO NODE 808.00 IS CODE = 62 ---------------------------------------------------------------------------- >>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>(STREET TABLE SECTION # 3 USED)<<<<<
============================================================================ REPRESENTATIVE SLOPE = 0.0260
STREET LENGTH(FEET) = 804.00 CURB HEIGHT(INCHES) = 8.0
STREET HALFWIDTH(FEET) = 25.00
DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 20.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020
OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1
STREET PARKWAY CROSSFALL(DECIMAL) = 0.050
Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0150 Manning's FRICTION FACTOR for Back-of-Walk Flow Section = 0.0150 **TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 79.50 ***STREET FLOW SPLITS OVER STREET-CROWN***
FULL DEPTH(FEET) = 0.66 FLOOD WIDTH(FEET) = 25.00
FULL HALF-STREET VELOCITY(FEET/SEC.) = 6.35
SPLIT DEPTH(FEET) = 0.65 SPLIT FLOOD WIDTH(FEET) = 24.41 SPLIT FLOW(CFS) = 38.62 SPLIT VELOCITY(FEET/SEC.) = 6.28 STREETFLOW MODEL RESULTS USING ESTIMATED FLOW:

STREET FLOW DEPTH(FEET) = 0.66
HALFSTREET FLOOD WIDTH(FEET) = 25.00
AVERAGE FLOW VELOCITY(FEET/SEC.) = 6.35
PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 4.18
STREET FLOW TRAVEL TIME(MIN.) = 2.11 Tc(MIN.) = 12.00
* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 4.988
SUBAREA LOSS RATE DATA(AMC III):

Meyers Creek – Existing Condition 2024

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Mayor and City CouncilOctober 21, 2026

Mayor and City Council
October 21, 2026