Attachment 6v - CPC Staff Report - May 21, 2026 — Riverside City Council, July 14, 2026 (part 1 of 2)

Hydrology Report Prepared by
Riverside, California KHR Associates

Appendix 2.1
Post-Development Hydrology Calculations:

On-Site plus Off-Site Runoff

____________________________________________________________________________ ****************************************************************************

RATIONAL METHOD HYDROLOGY COMPUTER PROGRAM BASED ON

RIVERSIDE COUNTY FLOOD CONTROL & WATER CONSERVATION DISTRICT (RCFC&WCD) 1978 HYDROLOGY MANUAL
(c) Copyright 1982-2016 Advanced Engineering Software (aes) (Rational Tabling Version 23.0)
Release Date: 07/01/2016 License ID 1681
Analysis prepared by:

KHR Associates
17530 Von Karman Avenue
Irvine, CA 92626

************************** DESCRIPTION OF STUDY ************************** * IRON LOFTS * * POST-DEVELOPMENT HYDROLOGY - ON-SITE PLUS OFF-SITE RUNOFF * * 10-YEAR STORM EVENT * ************************************************************************** FILE NAME: RIL1-R10.DAT
TIME/DATE OF STUDY: 09:51 08/05/2024
---------------------------------------------------------------------------- USER SPECIFIED HYDROLOGY AND HYDRAULIC MODEL INFORMATION:
---------------------------------------------------------------------------- USER SPECIFIED STORM EVENT(YEAR) = 10.00
SPECIFIED MINIMUM PIPE SIZE(INCH) = 4.00
SPECIFIED PERCENT OF GRADIENTS(DECIMAL) TO USE FOR FRICTION SLOPE = 0.95 10-YEAR STORM 10-MINUTE INTENSITY(INCH/HOUR) = 2.140
10-YEAR STORM 60-MINUTE INTENSITY(INCH/HOUR) = 0.800
100-YEAR STORM 10-MINUTE INTENSITY(INCH/HOUR) = 3.210
100-YEAR STORM 60-MINUTE INTENSITY(INCH/HOUR) = 1.200
SLOPE OF 10-YEAR INTENSITY-DURATION CURVE = 0.5491525
SLOPE OF 100-YEAR INTENSITY-DURATION CURVE = 0.5491524 COMPUTED RAINFALL INTENSITY DATA:

STORM EVENT = 10.00 1-HOUR INTENSITY(INCH/HOUR) = 0.808 SLOPE OF INTENSITY DURATION CURVE = 0.5492
RCFC&WCD HYDROLOGY MANUAL "C"-VALUES USED FOR RATIONAL METHOD NOTE: CONSIDER ALL CONFLUENCE STREAM COMBINATIONS

FOR ALL DOWNSTREAM ANALYSES
*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 0.0313 0.167 0.0150 GLOBAL STREET FLOW-DEPTH CONSTRAINTS:

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.*
**************************************************************************** FLOW PROCESS FROM NODE 1.00 TO NODE 2.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 124.00
UPSTREAM ELEVATION(FEET) = 879.50
DOWNSTREAM ELEVATION(FEET) = 877.89
ELEVATION DIFFERENCE(FEET) = 1.61
TC = 0.323*[( 124.00**3)/( 1.61)]**.2 = 5.290
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.066
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8706
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 0.99
TOTAL AREA(ACRES) = 0.37 TOTAL RUNOFF(CFS) = 0.99 **************************************************************************** FLOW PROCESS FROM NODE 2.00 TO NODE 2.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 1 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 2.00 TO NODE 2.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 3.00 TO NODE 4.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 93.44
UPSTREAM ELEVATION(FEET) = 15.00
DOWNSTREAM ELEVATION(FEET) = 13.00
ELEVATION DIFFERENCE(FEET) = 2.00
TC = 0.323*[( 93.44**3)/( 2.00)]**.2 = 4.275
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.163
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8713
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 0.67
TOTAL AREA(ACRES) = 0.24 TOTAL RUNOFF(CFS) = 0.67 **************************************************************************** FLOW PROCESS FROM NODE 4.00 TO NODE 4.10 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 59.80 MANNING'S N = 0.009
DEPTH OF FLOW IN 6.0 INCH PIPE IS 4.2 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 4.51
GIVEN PIPE DIAMETER(INCH) = 6.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.67
PIPE TRAVEL TIME(MIN.) = 0.22 Tc(MIN.) = 5.22
LONGEST FLOWPATH FROM NODE 3.00 TO NODE 4.10 = 153.24 FEET. **************************************************************************** FLOW PROCESS FROM NODE 4.10 TO NODE 5.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 13.79 MANNING'S N = 0.009
DEPTH OF FLOW IN 8.0 INCH PIPE IS 3.5 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 4.59
GIVEN PIPE DIAMETER(INCH) = 8.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.67
PIPE TRAVEL TIME(MIN.) = 0.05 Tc(MIN.) = 5.27
LONGEST FLOWPATH FROM NODE 3.00 TO NODE 5.00 = 167.03 FEET. **************************************************************************** FLOW PROCESS FROM NODE 5.00 TO NODE 5.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 2 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 5.00 TO NODE 5.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 6.00 TO NODE 7.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 94.00
UPSTREAM ELEVATION(FEET) = 15.00
DOWNSTREAM ELEVATION(FEET) = 13.00
ELEVATION DIFFERENCE(FEET) = 2.00
TC = 0.323*[( 94.00**3)/( 2.00)]**.2 = 4.290
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.163
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8713
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 0.55
TOTAL AREA(ACRES) = 0.20 TOTAL RUNOFF(CFS) = 0.55 **************************************************************************** FLOW PROCESS FROM NODE 7.00 TO NODE 5.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 12.57 MANNING'S N = 0.009

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 6.35
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 4.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.55
PIPE TRAVEL TIME(MIN.) = 0.03 Tc(MIN.) = 5.03
LONGEST FLOWPATH FROM NODE 6.00 TO NODE 5.00 = 106.57 FEET. **************************************************************************** FLOW PROCESS FROM NODE 5.00 TO NODE 5.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 2 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 0.55 5.03 3.151 0.20
LONGEST FLOWPATH FROM NODE 6.00 TO NODE 5.00 = 106.57 FEET. ** MEMORY BANK # 2 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 0.67 5.27 3.072 0.24
LONGEST FLOWPATH FROM NODE 3.00 TO NODE 5.00 = 167.03 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 1.19 5.03 3.151
2 1.21 5.27 3.072
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 1.21 Tc(MIN.) = 5.27
TOTAL AREA(ACRES) = 0.4
**************************************************************************** FLOW PROCESS FROM NODE 5.00 TO NODE 5.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 2 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 7.10 TO NODE 7.10 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ 10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.072
UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .7531
SOIL CLASSIFICATION IS "C"
SUBAREA AREA(ACRES) = 0.10 SUBAREA RUNOFF(CFS) = 0.24 TOTAL AREA(ACRES) = 0.5 TOTAL RUNOFF(CFS) = 1.45 TC(MIN.) = 5.27
**************************************************************************** FLOW PROCESS FROM NODE 5.00 TO NODE 2.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 78.38 MANNING'S N = 0.009
DEPTH OF FLOW IN 8.0 INCH PIPE IS 5.7 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 5.47
GIVEN PIPE DIAMETER(INCH) = 8.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 1.45
PIPE TRAVEL TIME(MIN.) = 0.24 Tc(MIN.) = 5.51
LONGEST FLOWPATH FROM NODE 3.00 TO NODE 2.00 = 245.41 FEET. **************************************************************************** FLOW PROCESS FROM NODE 2.00 TO NODE 2.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 1 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 1.44 5.27 3.072 0.55
2 1.45 5.51 2.998 0.55
LONGEST FLOWPATH FROM NODE 3.00 TO NODE 2.00 = 245.41 FEET. ** MEMORY BANK # 1 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 0.99 5.29 3.066 0.37
LONGEST FLOWPATH FROM NODE 1.00 TO NODE 2.00 = 124.00 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 2.42 5.27 3.072
2 2.42 5.29 3.066
3 2.41 5.51 2.998
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 2.42 Tc(MIN.) = 5.29
TOTAL AREA(ACRES) = 0.9
**************************************************************************** FLOW PROCESS FROM NODE 2.00 TO NODE 2.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 1 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 2.00 TO NODE 8.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 145.73 MANNING'S N = 0.009
DEPTH OF FLOW IN 10.0 INCH PIPE IS 6.7 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 6.27
GIVEN PIPE DIAMETER(INCH) = 10.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 2.42
PIPE TRAVEL TIME(MIN.) = 0.39 Tc(MIN.) = 5.68
LONGEST FLOWPATH FROM NODE 3.00 TO NODE 8.00 = 391.14 FEET. **************************************************************************** FLOW PROCESS FROM NODE 8.00 TO NODE 8.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 1 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 8.00 TO NODE 8.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 9.00 TO NODE 10.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 71.61
UPSTREAM ELEVATION(FEET) = 15.00
DOWNSTREAM ELEVATION(FEET) = 13.00
ELEVATION DIFFERENCE(FEET) = 2.00
TC = 0.323*[( 71.61**3)/( 2.00)]**.2 = 3.644
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.163
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8713
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 0.56
TOTAL AREA(ACRES) = 0.20 TOTAL RUNOFF(CFS) = 0.56 **************************************************************************** FLOW PROCESS FROM NODE 10.00 TO NODE 10.10 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 45.35 MANNING'S N = 0.009

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 6.41
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 4.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.56
PIPE TRAVEL TIME(MIN.) = 0.12 Tc(MIN.) = 5.12
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 10.10 = 116.96 FEET. **************************************************************************** FLOW PROCESS FROM NODE 10.10 TO NODE 10.20 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 37.68 MANNING'S N = 0.009
DEPTH OF FLOW IN 6.0 INCH PIPE IS 3.7 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 4.34
GIVEN PIPE DIAMETER(INCH) = 6.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.56
PIPE TRAVEL TIME(MIN.) = 0.14 Tc(MIN.) = 5.26
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 10.20 = 154.64 FEET. **************************************************************************** FLOW PROCESS FROM NODE 10.20 TO NODE 10.20 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 3 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 10.20 TO NODE 10.20 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 10.30 TO NODE 10.40 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM
DEVELOPMENT IS: UNDEVELOPED WITH GOOD COVER
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 17.00
UPSTREAM ELEVATION(FEET) = 878.70
DOWNSTREAM ELEVATION(FEET) = 878.32
ELEVATION DIFFERENCE(FEET) = 0.38
TC = 0.937*[( 17.00**3)/( 0.38)]**.2 = 6.226
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.804
UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .7416
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 0.17
TOTAL AREA(ACRES) = 0.08 TOTAL RUNOFF(CFS) = 0.17 **************************************************************************** FLOW PROCESS FROM NODE 10.40 TO NODE 10.20 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 8.88 MANNING'S N = 0.009
DEPTH OF FLOW IN 4.0 INCH PIPE IS 2.4 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 3.20
GIVEN PIPE DIAMETER(INCH) = 4.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.17
PIPE TRAVEL TIME(MIN.) = 0.05 Tc(MIN.) = 6.27
LONGEST FLOWPATH FROM NODE 10.30 TO NODE 10.20 = 25.88 FEET. **************************************************************************** FLOW PROCESS FROM NODE 10.20 TO NODE 10.20 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 3 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 0.17 6.27 2.792 0.08
LONGEST FLOWPATH FROM NODE 10.30 TO NODE 10.20 = 25.88 FEET. ** MEMORY BANK # 3 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 0.56 5.26 3.075 0.20
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 10.20 = 154.64 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 0.71 5.26 3.075
2 0.68 6.27 2.792
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 0.71 Tc(MIN.) = 5.26
TOTAL AREA(ACRES) = 0.3
**************************************************************************** FLOW PROCESS FROM NODE 10.20 TO NODE 10.20 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 3 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 10.20 TO NODE 10.50 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 131.52 MANNING'S N = 0.009
DEPTH OF FLOW IN 6.0 INCH PIPE IS 4.4 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 4.54
GIVEN PIPE DIAMETER(INCH) = 6.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.71
PIPE TRAVEL TIME(MIN.) = 0.48 Tc(MIN.) = 5.75
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 10.50 = 286.16 FEET. **************************************************************************** FLOW PROCESS FROM NODE 10.50 TO NODE 10.50 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ 10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.930
UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .7472
SOIL CLASSIFICATION IS "C"
SUBAREA AREA(ACRES) = 0.10 SUBAREA RUNOFF(CFS) = 0.22 TOTAL AREA(ACRES) = 0.4 TOTAL RUNOFF(CFS) = 0.92 TC(MIN.) = 5.75
**************************************************************************** FLOW PROCESS FROM NODE 10.50 TO NODE 8.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 137.41 MANNING'S N = 0.009
DEPTH OF FLOW IN 8.0 INCH PIPE IS 4.2 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 4.99
GIVEN PIPE DIAMETER(INCH) = 8.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.92
PIPE TRAVEL TIME(MIN.) = 0.46 Tc(MIN.) = 6.20
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 8.00 = 423.57 FEET. **************************************************************************** FLOW PROCESS FROM NODE 8.00 TO NODE 8.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 1 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 0.92 6.20 2.809 0.39
2 0.88 7.22 2.584 0.39
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 8.00 = 423.57 FEET. ** MEMORY BANK # 1 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 2.42 5.66 2.955 0.92
2 2.42 5.68 2.949 0.92
3 2.41 5.90 2.889 0.92
LONGEST FLOWPATH FROM NODE 3.00 TO NODE 8.00 = 391.14 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 3.26 5.66 2.955
2 3.27 5.68 2.949
3 3.29 5.90 2.889
4 3.27 6.20 2.809
5 3.04 7.22 2.584
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 3.29 Tc(MIN.) = 5.90
TOTAL AREA(ACRES) = 1.3
**************************************************************************** FLOW PROCESS FROM NODE 8.00 TO NODE 8.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 1 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 8.00 TO NODE 13.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 38.12 MANNING'S N = 0.009

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 6.03
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 10.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 3.29
PIPE TRAVEL TIME(MIN.) = 0.11 Tc(MIN.) = 6.00
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 13.00 = 461.69 FEET. **************************************************************************** FLOW PROCESS FROM NODE 13.00 TO NODE 13.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 1 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 13.00 TO NODE 13.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 11.00 TO NODE 12.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 36.94
UPSTREAM ELEVATION(FEET) = 15.00
DOWNSTREAM ELEVATION(FEET) = 13.00
ELEVATION DIFFERENCE(FEET) = 2.00
TC = 0.323*[( 36.94**3)/( 2.00)]**.2 = 2.450
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.163
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8713
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 0.14
TOTAL AREA(ACRES) = 0.05 TOTAL RUNOFF(CFS) = 0.14 **************************************************************************** FLOW PROCESS FROM NODE 12.00 TO NODE 13.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 41.32 MANNING'S N = 0.009
DEPTH OF FLOW IN 4.0 INCH PIPE IS 2.0 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 3.07
GIVEN PIPE DIAMETER(INCH) = 4.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.14
PIPE TRAVEL TIME(MIN.) = 0.22 Tc(MIN.) = 5.22
LONGEST FLOWPATH FROM NODE 11.00 TO NODE 13.00 = 78.26 FEET. **************************************************************************** FLOW PROCESS FROM NODE 13.00 TO NODE 13.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 1 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 0.14 5.22 3.087 0.05
LONGEST FLOWPATH FROM NODE 11.00 TO NODE 13.00 = 78.26 FEET. ** MEMORY BANK # 1 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 3.26 5.77 2.925 1.30
2 3.27 5.78 2.920 1.30
3 3.29 6.00 2.861 1.30
4 3.27 6.31 2.783 1.30
5 3.04 7.32 2.565 1.30
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 13.00 = 461.69 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 3.10 5.22 3.087
2 3.39 5.77 2.925
3 3.40 5.78 2.920
4 3.42 6.00 2.861
5 3.39 6.31 2.783
6 3.15 7.32 2.565
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 3.42 Tc(MIN.) = 6.00
TOTAL AREA(ACRES) = 1.4
**************************************************************************** FLOW PROCESS FROM NODE 13.00 TO NODE 13.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 1 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 13.00 TO NODE 13.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 1 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 13.00 TO NODE 13.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 14.00 TO NODE 15.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 282.36
UPSTREAM ELEVATION(FEET) = 881.50
DOWNSTREAM ELEVATION(FEET) = 877.80
ELEVATION DIFFERENCE(FEET) = 3.70
TC = 0.323*[( 282.36**3)/( 3.70)]**.2 = 7.339
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.562
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8659
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 2.93
TOTAL AREA(ACRES) = 1.32 TOTAL RUNOFF(CFS) = 2.93 **************************************************************************** FLOW PROCESS FROM NODE 15.00 TO NODE 15.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 1 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 2.93 7.34 2.562 1.32
LONGEST FLOWPATH FROM NODE 14.00 TO NODE 15.00 = 282.36 FEET. ** MEMORY BANK # 1 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 3.10 5.22 3.087 1.35
2 3.39 5.77 2.925 1.35
3 3.40 5.78 2.920 1.35
4 3.42 6.00 2.861 1.35
5 3.39 6.31 2.783 1.35
6 3.15 7.32 2.565 1.35
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 15.00 = 461.69 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 5.18 5.22 3.087
2 5.70 5.77 2.925
3 5.71 5.78 2.920
4 5.82 6.00 2.861
5 5.92 6.31 2.783
6 6.08 7.32 2.565
7 6.08 7.34 2.562
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 6.08 Tc(MIN.) = 7.34
TOTAL AREA(ACRES) = 2.7
**************************************************************************** FLOW PROCESS FROM NODE 15.00 TO NODE 15.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 1 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 15.00 TO NODE 15.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 1 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 15.00 TO NODE 15.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 16.00 TO NODE 17.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 74.23
UPSTREAM ELEVATION(FEET) = 15.00
DOWNSTREAM ELEVATION(FEET) = 13.00
ELEVATION DIFFERENCE(FEET) = 2.00
TC = 0.323*[( 74.23**3)/( 2.00)]**.2 = 3.723
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.163
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8713
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 0.80
TOTAL AREA(ACRES) = 0.29 TOTAL RUNOFF(CFS) = 0.80 **************************************************************************** FLOW PROCESS FROM NODE 17.00 TO NODE 17.10 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 15.20 MANNING'S N = 0.009

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 9.13
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 4.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.80
PIPE TRAVEL TIME(MIN.) = 0.03 Tc(MIN.) = 5.03
LONGEST FLOWPATH FROM NODE 16.00 TO NODE 17.10 = 89.43 FEET. **************************************************************************** FLOW PROCESS FROM NODE 17.00 TO NODE 18.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 164.51 MANNING'S N = 0.009
DEPTH OF FLOW IN 8.0 INCH PIPE IS 3.8 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 4.81
GIVEN PIPE DIAMETER(INCH) = 8.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.80
PIPE TRAVEL TIME(MIN.) = 0.57 Tc(MIN.) = 5.60
LONGEST FLOWPATH FROM NODE 16.00 TO NODE 18.00 = 253.94 FEET. **************************************************************************** FLOW PROCESS FROM NODE 18.00 TO NODE 18.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 2 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 18.00 TO NODE 18.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 19.00 TO NODE 20.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 147.00
UPSTREAM ELEVATION(FEET) = 881.00
DOWNSTREAM ELEVATION(FEET) = 878.08
ELEVATION DIFFERENCE(FEET) = 2.92
TC = 0.323*[( 147.00**3)/( 2.92)]**.2 = 5.201
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.095
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8708
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 0.85
TOTAL AREA(ACRES) = 0.31 TOTAL RUNOFF(CFS) = 0.85 **************************************************************************** FLOW PROCESS FROM NODE 20.00 TO NODE 20.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 2 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 0.85 5.20 3.095 0.31
LONGEST FLOWPATH FROM NODE 19.00 TO NODE 20.00 = 147.00 FEET. ** MEMORY BANK # 2 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 0.80 5.60 2.972 0.29
LONGEST FLOWPATH FROM NODE 16.00 TO NODE 20.00 = 253.94 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 1.59 5.20 3.095
2 1.61 5.60 2.972
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 1.61 Tc(MIN.) = 5.60
TOTAL AREA(ACRES) = 0.6
**************************************************************************** FLOW PROCESS FROM NODE 20.00 TO NODE 20.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 2 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 20.00 TO NODE 21.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 35.92 MANNING'S N = 0.009

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 8.21
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 6.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 1.61
PIPE TRAVEL TIME(MIN.) = 0.07 Tc(MIN.) = 5.67
LONGEST FLOWPATH FROM NODE 16.00 TO NODE 21.00 = 289.86 FEET. **************************************************************************** FLOW PROCESS FROM NODE 21.00 TO NODE 21.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 2 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 21.00 TO NODE 21.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 22.00 TO NODE 23.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM
DEVELOPMENT IS: UNDEVELOPED WITH GOOD COVER
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 77.86
UPSTREAM ELEVATION(FEET) = 881.47
DOWNSTREAM ELEVATION(FEET) = 880.67
ELEVATION DIFFERENCE(FEET) = 0.80
TC = 0.937*[( 77.86**3)/( 0.80)]**.2 = 13.369
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 1.843
UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .6792
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 0.13
TOTAL AREA(ACRES) = 0.10 TOTAL RUNOFF(CFS) = 0.13 **************************************************************************** FLOW PROCESS FROM NODE 23.00 TO NODE 21.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 107.21 MANNING'S N = 0.009
DEPTH OF FLOW IN 6.0 INCH PIPE IS 1.6 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 2.93
GIVEN PIPE DIAMETER(INCH) = 6.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.13
PIPE TRAVEL TIME(MIN.) = 0.61 Tc(MIN.) = 13.98
LONGEST FLOWPATH FROM NODE 22.00 TO NODE 21.00 = 185.07 FEET. **************************************************************************** FLOW PROCESS FROM NODE 21.00 TO NODE 21.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 2 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 0.13 13.98 1.798 0.10
LONGEST FLOWPATH FROM NODE 22.00 TO NODE 21.00 = 185.07 FEET. ** MEMORY BANK # 2 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 1.59 5.28 3.071 0.60
2 1.61 5.67 2.951 0.60
LONGEST FLOWPATH FROM NODE 16.00 TO NODE 21.00 = 289.86 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 1.64 5.28 3.071
2 1.66 5.67 2.951
3 1.11 13.98 1.798
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 1.66 Tc(MIN.) = 5.67
TOTAL AREA(ACRES) = 0.7
**************************************************************************** FLOW PROCESS FROM NODE 21.00 TO NODE 21.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 2 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 21.00 TO NODE 24.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 136.64 MANNING'S N = 0.009

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 8.47
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 6.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 1.66
PIPE TRAVEL TIME(MIN.) = 0.27 Tc(MIN.) = 5.94
LONGEST FLOWPATH FROM NODE 16.00 TO NODE 24.00 = 426.50 FEET. **************************************************************************** FLOW PROCESS FROM NODE 24.00 TO NODE 24.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 1 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 1.64 5.55 2.987 0.70
2 1.66 5.94 2.877 0.70
3 1.11 14.38 1.770 0.70
LONGEST FLOWPATH FROM NODE 16.00 TO NODE 24.00 = 426.50 FEET. ** MEMORY BANK # 1 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 5.18 5.22 3.087 2.68
2 5.70 5.77 2.925 2.68
3 5.71 5.78 2.920 2.68
4 5.82 6.00 2.861 2.68
5 5.92 6.31 2.783 2.68
6 6.08 7.32 2.565 2.68
7 6.08 7.34 2.562 2.68
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 24.00 = 461.69 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 6.73 5.22 3.087
2 7.12 5.55 2.987
3 7.31 5.77 2.925
4 7.33 5.78 2.920
5 7.42 5.94 2.877
6 7.47 6.00 2.861
7 7.53 6.31 2.783
8 7.56 7.32 2.565
9 7.56 7.34 2.562
10 5.31 14.38 1.770
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 7.56 Tc(MIN.) = 7.34
TOTAL AREA(ACRES) = 3.4
**************************************************************************** FLOW PROCESS FROM NODE 24.00 TO NODE 24.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 1 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 24.00 TO NODE 25.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 55.93 MANNING'S N = 0.009

ASSUMED INITIAL SUBAREA UNIFORM
DEVELOPMENT IS SINGLE FAMILY (1/4 ACRE)
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 2313.53
UPSTREAM ELEVATION(FEET) = 910.75
DOWNSTREAM ELEVATION(FEET) = 881.40
ELEVATION DIFFERENCE(FEET) = 29.35
TC = 0.393*[( 2313.53**3)/( 29.35)]**.2 = 20.845
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 1.444
SINGLE-FAMILY(1/4 ACRE LOT) RUNOFF COEFFICIENT = .7681
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 14.65
TOTAL AREA(ACRES) = 13.21 TOTAL RUNOFF(CFS) = 14.65 **************************************************************************** FLOW PROCESS FROM NODE 27.30 TO NODE 27.40 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0125
FLOW LENGTH(FEET) = 22.90 MANNING'S N = 0.013
DEPTH OF FLOW IN 24.0 INCH PIPE IS 13.3 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 8.18
GIVEN PIPE DIAMETER(INCH) = 24.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 14.65
PIPE TRAVEL TIME(MIN.) = 0.05 Tc(MIN.) = 20.89
LONGEST FLOWPATH FROM NODE 27.20 TO NODE 27.40 = 2336.43 FEET. **************************************************************************** FLOW PROCESS FROM NODE 27.40 TO NODE 27.50 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0150
FLOW LENGTH(FEET) = 221.35 MANNING'S N = 0.013
DEPTH OF FLOW IN 24.0 INCH PIPE IS 12.6 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 8.77
GIVEN PIPE DIAMETER(INCH) = 24.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 14.65
PIPE TRAVEL TIME(MIN.) = 0.42 Tc(MIN.) = 21.31
LONGEST FLOWPATH FROM NODE 27.20 TO NODE 27.50 = 2557.78 FEET. **************************************************************************** FLOW PROCESS FROM NODE 27.50 TO NODE 27.10 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0150
FLOW LENGTH(FEET) = 106.50 MANNING'S N = 0.013
DEPTH OF FLOW IN 24.0 INCH PIPE IS 12.6 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 8.77
GIVEN PIPE DIAMETER(INCH) = 24.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 14.65
PIPE TRAVEL TIME(MIN.) = 0.20 Tc(MIN.) = 21.51
LONGEST FLOWPATH FROM NODE 27.20 TO NODE 27.10 = 2664.28 FEET. **************************************************************************** FLOW PROCESS FROM NODE 27.10 TO NODE 27.10 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 1 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 14.65 21.51 1.419 13.21
LONGEST FLOWPATH FROM NODE 27.20 TO NODE 27.10 = 2664.28 FEET. ** MEMORY BANK # 1 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 6.73 6.94 2.642 3.38
2 7.12 7.24 2.580 3.38
3 7.31 7.45 2.540 3.38
4 7.33 7.47 2.537 3.38
5 7.42 7.62 2.509 3.38
6 7.47 7.68 2.498 3.38
7 7.53 7.99 2.445 3.38
8 7.56 9.00 2.290 3.38
9 7.56 9.02 2.288 3.38
10 5.31 16.19 1.659 3.38
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 27.10 = 1052.76 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 11.45 6.94 2.642
2 12.05 7.24 2.580
3 12.39 7.45 2.540
4 12.42 7.47 2.537
5 12.61 7.62 2.509
6 12.70 7.68 2.498
7 12.97 7.99 2.445
8 13.69 9.00 2.290
9 13.70 9.02 2.288
10 16.33 16.19 1.659
11 19.34 21.51 1.419
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 19.34 Tc(MIN.) = 21.51
TOTAL AREA(ACRES) = 16.6
**************************************************************************** FLOW PROCESS FROM NODE 27.10 TO NODE 27.10 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 1 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 27.10 TO NODE 28.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0040
FLOW LENGTH(FEET) = 71.25 MANNING'S N = 0.013
DEPTH OF FLOW IN 36.0 INCH PIPE IS 17.4 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 5.73
GIVEN PIPE DIAMETER(INCH) = 36.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 19.34
PIPE TRAVEL TIME(MIN.) = 0.21 Tc(MIN.) = 21.72
LONGEST FLOWPATH FROM NODE 27.20 TO NODE 28.00 = 2735.53 FEET. **************************************************************************** FLOW PROCESS FROM NODE 28.00 TO NODE 28.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 1 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 28.00 TO NODE 28.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 29.00 TO NODE 30.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 61.88
UPSTREAM ELEVATION(FEET) = 882.80
DOWNSTREAM ELEVATION(FEET) = 882.10
ELEVATION DIFFERENCE(FEET) = 0.70
TC = 0.323*[( 61.88**3)/( 0.70)]**.2 = 4.118
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.163
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8713
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 0.45
TOTAL AREA(ACRES) = 0.16 TOTAL RUNOFF(CFS) = 0.45 **************************************************************************** FLOW PROCESS FROM NODE 30.00 TO NODE 31.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 55.57 MANNING'S N = 0.009

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 5.18
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 4.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.45
PIPE TRAVEL TIME(MIN.) = 0.18 Tc(MIN.) = 5.18
LONGEST FLOWPATH FROM NODE 29.00 TO NODE 31.00 = 117.45 FEET. **************************************************************************** FLOW PROCESS FROM NODE 31.00 TO NODE 32.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 89.09 MANNING'S N = 0.009
DEPTH OF FLOW IN 6.0 INCH PIPE IS 3.2 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 4.16
GIVEN PIPE DIAMETER(INCH) = 6.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.45
PIPE TRAVEL TIME(MIN.) = 0.36 Tc(MIN.) = 5.54
LONGEST FLOWPATH FROM NODE 29.00 TO NODE 32.00 = 206.54 FEET. **************************************************************************** FLOW PROCESS FROM NODE 32.00 TO NODE 33.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 23.50 MANNING'S N = 0.009
DEPTH OF FLOW IN 8.0 INCH PIPE IS 2.8 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 4.09
GIVEN PIPE DIAMETER(INCH) = 8.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.45
PIPE TRAVEL TIME(MIN.) = 0.10 Tc(MIN.) = 5.63
LONGEST FLOWPATH FROM NODE 29.00 TO NODE 33.00 = 230.04 FEET. **************************************************************************** FLOW PROCESS FROM NODE 33.00 TO NODE 33.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 3 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 33.00 TO NODE 33.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 34.00 TO NODE 35.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 65.92
UPSTREAM ELEVATION(FEET) = 15.00
DOWNSTREAM ELEVATION(FEET) = 13.00
ELEVATION DIFFERENCE(FEET) = 2.00
TC = 0.323*[( 65.92**3)/( 2.00)]**.2 = 3.467
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.163
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8713
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 0.26
TOTAL AREA(ACRES) = 0.09 TOTAL RUNOFF(CFS) = 0.26 **************************************************************************** FLOW PROCESS FROM NODE 35.00 TO NODE 33.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 2.00 MANNING'S N = 0.009
DEPTH OF FLOW IN 4.0 INCH PIPE IS 3.2 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 3.46
GIVEN PIPE DIAMETER(INCH) = 4.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.26
PIPE TRAVEL TIME(MIN.) = 0.01 Tc(MIN.) = 5.01
LONGEST FLOWPATH FROM NODE 34.00 TO NODE 33.00 = 67.92 FEET. **************************************************************************** FLOW PROCESS FROM NODE 33.00 TO NODE 33.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 3 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 0.26 5.01 3.159 0.09
LONGEST FLOWPATH FROM NODE 34.00 TO NODE 33.00 = 67.92 FEET. ** MEMORY BANK # 3 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 0.45 5.63 2.963 0.16
LONGEST FLOWPATH FROM NODE 29.00 TO NODE 33.00 = 230.04 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 0.66 5.01 3.159
2 0.69 5.63 2.963
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 0.69 Tc(MIN.) = 5.63
TOTAL AREA(ACRES) = 0.3
**************************************************************************** FLOW PROCESS FROM NODE 33.00 TO NODE 33.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 3 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 33.00 TO NODE 36.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 48.57 MANNING'S N = 0.009
DEPTH OF FLOW IN 8.0 INCH PIPE IS 3.6 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 4.62
GIVEN PIPE DIAMETER(INCH) = 8.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.69
PIPE TRAVEL TIME(MIN.) = 0.18 Tc(MIN.) = 5.81
LONGEST FLOWPATH FROM NODE 29.00 TO NODE 36.00 = 278.61 FEET. **************************************************************************** FLOW PROCESS FROM NODE 36.00 TO NODE 36.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 3 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 34.00 TO NODE 34.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 37.00 TO NODE 38.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM
DEVELOPMENT IS: UNDEVELOPED WITH GOOD COVER
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 47.00
UPSTREAM ELEVATION(FEET) = 879.59
DOWNSTREAM ELEVATION(FEET) = 878.75
ELEVATION DIFFERENCE(FEET) = 0.84
TC = 0.937*[( 47.00**3)/( 0.84)]**.2 = 9.780
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.188
UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .7066
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 0.14
TOTAL AREA(ACRES) = 0.09 TOTAL RUNOFF(CFS) = 0.14 **************************************************************************** FLOW PROCESS FROM NODE 38.00 TO NODE 36.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 14.50 MANNING'S N = 0.009
DEPTH OF FLOW IN 10.0 INCH PIPE IS 1.4 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 2.88
GIVEN PIPE DIAMETER(INCH) = 10.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.14
PIPE TRAVEL TIME(MIN.) = 0.08 Tc(MIN.) = 9.86
LONGEST FLOWPATH FROM NODE 37.00 TO NODE 36.00 = 61.50 FEET. **************************************************************************** FLOW PROCESS FROM NODE 36.00 TO NODE 36.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 3 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 0.14 9.86 2.178 0.09
LONGEST FLOWPATH FROM NODE 37.00 TO NODE 36.00 = 61.50 FEET. ** MEMORY BANK # 3 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 0.66 5.19 3.100 0.26
2 0.69 5.81 2.913 0.26
LONGEST FLOWPATH FROM NODE 29.00 TO NODE 36.00 = 278.61 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 0.73 5.19 3.100
2 0.77 5.81 2.913
3 0.66 9.86 2.178
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 0.77 Tc(MIN.) = 5.81
TOTAL AREA(ACRES) = 0.3
**************************************************************************** FLOW PROCESS FROM NODE 36.00 TO NODE 39.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 52.84 MANNING'S N = 0.009
DEPTH OF FLOW IN 10.0 INCH PIPE IS 3.4 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 4.72
GIVEN PIPE DIAMETER(INCH) = 10.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.77
PIPE TRAVEL TIME(MIN.) = 0.19 Tc(MIN.) = 5.99
LONGEST FLOWPATH FROM NODE 29.00 TO NODE 39.00 = 331.45 FEET. **************************************************************************** FLOW PROCESS FROM NODE 39.00 TO NODE 39.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 3 <<<<< ============================================================================ ***MEMORY BANK # 3 IS FULL. THEREFORE, MAIN-STREAM MEMORY DATA CAN NOT BE COPIED ONTO IT - PROCESS IGNORED.***
**************************************************************************** FLOW PROCESS FROM NODE 39.00 TO NODE 39.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 40.00 TO NODE 41.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 74.92
UPSTREAM ELEVATION(FEET) = 15.00
DOWNSTREAM ELEVATION(FEET) = 13.00
ELEVATION DIFFERENCE(FEET) = 2.00
TC = 0.323*[( 74.92**3)/( 2.00)]**.2 = 3.744
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.163
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8713
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 1.11
TOTAL AREA(ACRES) = 0.40 TOTAL RUNOFF(CFS) = 1.11 **************************************************************************** FLOW PROCESS FROM NODE 41.00 TO NODE 39.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 7.00 MANNING'S N = 0.009

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 12.76
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 4.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 1.11
PIPE TRAVEL TIME(MIN.) = 0.01 Tc(MIN.) = 5.01
LONGEST FLOWPATH FROM NODE 40.00 TO NODE 39.00 = 81.92 FEET. **************************************************************************** FLOW PROCESS FROM NODE 39.00 TO NODE 39.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 3 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 1.11 5.01 3.159 0.40
LONGEST FLOWPATH FROM NODE 40.00 TO NODE 39.00 = 81.92 FEET. ** MEMORY BANK # 3 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 0.66 5.19 3.100 0.26
2 0.69 5.81 2.913 0.26
LONGEST FLOWPATH FROM NODE 29.00 TO NODE 39.00 = 278.61 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 1.75 5.01 3.159
2 1.75 5.19 3.100
3 1.72 5.81 2.913
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 1.75 Tc(MIN.) = 5.19
TOTAL AREA(ACRES) = 0.7
**************************************************************************** FLOW PROCESS FROM NODE 39.00 TO NODE 39.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 3 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 39.00 TO NODE 42.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 52.87 MANNING'S N = 0.009
DEPTH OF FLOW IN 10.0 INCH PIPE IS 5.4 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 5.83
GIVEN PIPE DIAMETER(INCH) = 10.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 1.75
PIPE TRAVEL TIME(MIN.) = 0.15 Tc(MIN.) = 5.34
LONGEST FLOWPATH FROM NODE 29.00 TO NODE 42.00 = 331.48 FEET. **************************************************************************** FLOW PROCESS FROM NODE 42.00 TO NODE 43.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 91.61 MANNING'S N = 0.010
DEPTH OF FLOW IN 12.0 INCH PIPE IS 5.2 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 5.38
GIVEN PIPE DIAMETER(INCH) = 12.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 1.75
PIPE TRAVEL TIME(MIN.) = 0.28 Tc(MIN.) = 5.62
LONGEST FLOWPATH FROM NODE 29.00 TO NODE 43.00 = 423.09 FEET. **************************************************************************** FLOW PROCESS FROM NODE 43.00 TO NODE 43.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 3 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 43.00 TO NODE 43.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 44.00 TO NODE 45.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 47.00
UPSTREAM ELEVATION(FEET) = 15.00
DOWNSTREAM ELEVATION(FEET) = 13.00
ELEVATION DIFFERENCE(FEET) = 2.00
TC = 0.323*[( 47.00**3)/( 2.00)]**.2 = 2.830
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.163
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8713
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 0.97
TOTAL AREA(ACRES) = 0.35 TOTAL RUNOFF(CFS) = 0.97 **************************************************************************** FLOW PROCESS FROM NODE 45.00 TO NODE 46.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 32.65 MANNING'S N = 0.009

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 4.95
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 6.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.97
PIPE TRAVEL TIME(MIN.) = 0.11 Tc(MIN.) = 5.11
LONGEST FLOWPATH FROM NODE 44.00 TO NODE 46.00 = 79.65 FEET. **************************************************************************** FLOW PROCESS FROM NODE 46.00 TO NODE 47.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 231.00 MANNING'S N = 0.009
DEPTH OF FLOW IN 8.0 INCH PIPE IS 4.3 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 5.04
GIVEN PIPE DIAMETER(INCH) = 8.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.97
PIPE TRAVEL TIME(MIN.) = 0.76 Tc(MIN.) = 5.87
LONGEST FLOWPATH FROM NODE 44.00 TO NODE 47.00 = 310.65 FEET. **************************************************************************** FLOW PROCESS FROM NODE 47.00 TO NODE 47.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ 10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.895
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8691
SOIL CLASSIFICATION IS "C"
SUBAREA AREA(ACRES) = 0.22 SUBAREA RUNOFF(CFS) = 0.56 TOTAL AREA(ACRES) = 0.6 TOTAL RUNOFF(CFS) = 1.53 TC(MIN.) = 5.87
**************************************************************************** FLOW PROCESS FROM NODE 47.00 TO NODE 48.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 40.21 MANNING'S N = 0.009
DEPTH OF FLOW IN 8.0 INCH PIPE IS 5.9 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 5.51
GIVEN PIPE DIAMETER(INCH) = 8.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 1.53
PIPE TRAVEL TIME(MIN.) = 0.12 Tc(MIN.) = 6.00
LONGEST FLOWPATH FROM NODE 44.00 TO NODE 48.00 = 350.86 FEET. **************************************************************************** FLOW PROCESS FROM NODE 48.00 TO NODE 48.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ 10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.863
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8689
SOIL CLASSIFICATION IS "C"
SUBAREA AREA(ACRES) = 0.29 SUBAREA RUNOFF(CFS) = 0.72 TOTAL AREA(ACRES) = 0.9 TOTAL RUNOFF(CFS) = 2.25 TC(MIN.) = 6.00
**************************************************************************** FLOW PROCESS FROM NODE 48.00 TO NODE 43.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 98.04 MANNING'S N = 0.009

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 6.45
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 8.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 2.25
PIPE TRAVEL TIME(MIN.) = 0.25 Tc(MIN.) = 6.25
LONGEST FLOWPATH FROM NODE 44.00 TO NODE 43.00 = 448.90 FEET. **************************************************************************** FLOW PROCESS FROM NODE 43.00 TO NODE 43.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 3 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 2.25 6.25 2.798 0.86
LONGEST FLOWPATH FROM NODE 44.00 TO NODE 43.00 = 448.90 FEET. ** MEMORY BANK # 3 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 1.75 5.44 3.018 0.66
2 1.75 5.62 2.966 0.66
3 1.72 6.24 2.800 0.66
LONGEST FLOWPATH FROM NODE 29.00 TO NODE 43.00 = 423.09 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 3.71 5.44 3.018
2 3.77 5.62 2.966
3 3.97 6.24 2.800
4 3.97 6.25 2.798
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 3.97 Tc(MIN.) = 6.25
TOTAL AREA(ACRES) = 1.5
**************************************************************************** FLOW PROCESS FROM NODE 43.00 TO NODE 43.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 3 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 43.00 TO NODE 49.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 33.92 MANNING'S N = 0.010
DEPTH OF FLOW IN 12.0 INCH PIPE IS 8.7 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 6.48
GIVEN PIPE DIAMETER(INCH) = 12.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 3.97
PIPE TRAVEL TIME(MIN.) = 0.09 Tc(MIN.) = 6.34
LONGEST FLOWPATH FROM NODE 44.00 TO NODE 49.00 = 482.82 FEET. **************************************************************************** FLOW PROCESS FROM NODE 49.00 TO NODE 49.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 2 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 49.00 TO NODE 49.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 50.00 TO NODE 51.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 97.11
UPSTREAM ELEVATION(FEET) = 878.85
DOWNSTREAM ELEVATION(FEET) = 877.75
ELEVATION DIFFERENCE(FEET) = 1.10
TC = 0.323*[( 97.11**3)/( 1.10)]**.2 = 4.930
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.163
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8713
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 0.93
TOTAL AREA(ACRES) = 0.34 TOTAL RUNOFF(CFS) = 0.93 **************************************************************************** FLOW PROCESS FROM NODE 51.00 TO NODE 51.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 2 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 0.93 5.00 3.163 0.34
LONGEST FLOWPATH FROM NODE 50.00 TO NODE 51.00 = 97.11 FEET. ** MEMORY BANK # 2 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 3.71 5.53 2.992 1.52
2 3.77 5.71 2.940 1.52
3 3.97 6.33 2.778 1.52
4 3.97 6.34 2.777 1.52
LONGEST FLOWPATH FROM NODE 44.00 TO NODE 51.00 = 482.82 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 4.28 5.00 3.163
2 4.59 5.53 2.992
3 4.64 5.71 2.940
4 4.78 6.33 2.778
5 4.78 6.34 2.777
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 4.78 Tc(MIN.) = 6.34
TOTAL AREA(ACRES) = 1.9
**************************************************************************** FLOW PROCESS FROM NODE 51.00 TO NODE 51.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 2 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 51.00 TO NODE 52.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 51.05 MANNING'S N = 0.010
DEPTH OF FLOW IN 15.0 INCH PIPE IS 8.2 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 6.93
GIVEN PIPE DIAMETER(INCH) = 15.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 4.78
PIPE TRAVEL TIME(MIN.) = 0.12 Tc(MIN.) = 6.46
LONGEST FLOWPATH FROM NODE 44.00 TO NODE 52.00 = 533.87 FEET. **************************************************************************** FLOW PROCESS FROM NODE 52.00 TO NODE 52.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 2 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 52.00 TO NODE 52.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 53.00 TO NODE 54.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 96.84
UPSTREAM ELEVATION(FEET) = 878.85
DOWNSTREAM ELEVATION(FEET) = 877.60
ELEVATION DIFFERENCE(FEET) = 1.25
TC = 0.323*[( 96.84**3)/( 1.25)]**.2 = 4.798
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.163
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8713
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 0.85
TOTAL AREA(ACRES) = 0.31 TOTAL RUNOFF(CFS) = 0.85 **************************************************************************** FLOW PROCESS FROM NODE 54.00 TO NODE 54.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 3 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 54.00 TO NODE 54.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 55.00 TO NODE 56.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 217.19
UPSTREAM ELEVATION(FEET) = 881.21
DOWNSTREAM ELEVATION(FEET) = 878.03
ELEVATION DIFFERENCE(FEET) = 3.18
TC = 0.323*[( 217.19**3)/( 3.18)]**.2 = 6.463
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.747
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8678
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 2.66
TOTAL AREA(ACRES) = 1.12 TOTAL RUNOFF(CFS) = 2.66 **************************************************************************** FLOW PROCESS FROM NODE 56.00 TO NODE 57.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 140.51 MANNING'S N = 0.009

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 7.63
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 8.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 2.66
PIPE TRAVEL TIME(MIN.) = 0.31 Tc(MIN.) = 6.77
LONGEST FLOWPATH FROM NODE 55.00 TO NODE 57.00 = 357.70 FEET. **************************************************************************** FLOW PROCESS FROM NODE 57.00 TO NODE 57.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 3 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 2.66 6.77 2.678 1.12
LONGEST FLOWPATH FROM NODE 55.00 TO NODE 57.00 = 357.70 FEET. ** MEMORY BANK # 3 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 0.85 5.00 3.163 0.31
LONGEST FLOWPATH FROM NODE 53.00 TO NODE 57.00 = 96.84 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 2.82 5.00 3.163
2 3.39 6.77 2.678
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 3.39 Tc(MIN.) = 6.77
TOTAL AREA(ACRES) = 1.4
**************************************************************************** FLOW PROCESS FROM NODE 57.00 TO NODE 57.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 2 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 2.82 5.00 3.163 1.43
2 3.39 6.77 2.678 1.43
LONGEST FLOWPATH FROM NODE 55.00 TO NODE 57.00 = 357.70 FEET. ** MEMORY BANK # 2 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 4.28 5.13 3.120 1.86
2 4.59 5.66 2.956 1.86
3 4.64 5.83 2.906 1.86
4 4.78 6.45 2.749 1.86
5 4.78 6.46 2.748 1.86
LONGEST FLOWPATH FROM NODE 44.00 TO NODE 57.00 = 533.87 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 7.00 5.00 3.163
2 7.06 5.13 3.120
3 7.42 5.66 2.956
4 7.56 5.83 2.906
5 8.01 6.45 2.749
6 8.01 6.46 2.748
7 8.05 6.77 2.678
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 8.05 Tc(MIN.) = 6.77
TOTAL AREA(ACRES) = 3.3
**************************************************************************** FLOW PROCESS FROM NODE 57.00 TO NODE 57.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 2 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 57.00 TO NODE 57.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 3 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 57.00 TO NODE 58.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 77.27 MANNING'S N = 0.010
DEPTH OF FLOW IN 18.0 INCH PIPE IS 10.1 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 7.89
GIVEN PIPE DIAMETER(INCH) = 18.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 8.05
PIPE TRAVEL TIME(MIN.) = 0.16 Tc(MIN.) = 6.93
LONGEST FLOWPATH FROM NODE 44.00 TO NODE 58.00 = 611.14 FEET. **************************************************************************** FLOW PROCESS FROM NODE 58.00 TO NODE 58.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 1 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 7.00 5.17 3.105 3.29
2 7.06 5.29 3.065 3.29
3 7.42 5.82 2.909 3.29
4 7.56 6.00 2.862 3.29
5 8.01 6.62 2.712 3.29
6 8.01 6.62 2.710 3.29
7 8.05 6.93 2.643 3.29
LONGEST FLOWPATH FROM NODE 44.00 TO NODE 58.00 = 611.14 FEET. ** MEMORY BANK # 1 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 11.45 7.18 2.594 16.59
2 12.05 7.48 2.535 16.59
3 12.39 7.69 2.497 16.59
4 12.42 7.70 2.494 16.59
5 12.61 7.85 2.468 16.59
6 12.70 7.91 2.458 16.59
7 12.97 8.22 2.407 16.59
8 13.69 9.23 2.259 16.59
9 13.70 9.24 2.257 16.59
10 16.33 16.40 1.647 16.59
11 19.34 21.72 1.412 16.59
LONGEST FLOWPATH FROM NODE 27.20 TO NODE 58.00 = 2735.53 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 15.33 5.17 3.105
2 15.60 5.29 3.065
3 16.80 5.82 2.909
4 17.23 6.00 2.862
5 18.68 6.62 2.712
6 18.69 6.62 2.710
7 19.22 6.93 2.643
8 19.35 7.18 2.594
9 19.77 7.48 2.535
10 19.99 7.69 2.497
11 20.01 7.70 2.494
12 20.13 7.85 2.468
13 20.19 7.91 2.458
14 20.30 8.22 2.407
15 20.57 9.23 2.259
16 20.57 9.24 2.257
17 21.35 16.40 1.647
18 23.64 21.72 1.412
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 23.64 Tc(MIN.) = 21.72
TOTAL AREA(ACRES) = 19.9
**************************************************************************** FLOW PROCESS FROM NODE 58.00 TO NODE 58.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 1 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 58.00 TO NODE 59.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0040
FLOW LENGTH(FEET) = 109.46 MANNING'S N = 0.013
DEPTH OF FLOW IN 36.0 INCH PIPE IS 19.6 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 6.02
GIVEN PIPE DIAMETER(INCH) = 36.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 23.64
PIPE TRAVEL TIME(MIN.) = 0.30 Tc(MIN.) = 22.02
LONGEST FLOWPATH FROM NODE 27.20 TO NODE 59.00 = 2844.99 FEET. ============================================================================ END OF STUDY SUMMARY:

TOTAL AREA(ACRES) = 19.9 TC(MIN.) = 22.02 PEAK FLOW RATE(CFS) = 23.64
*** PEAK FLOW RATE TABLE ***
Q(CFS) Tc(MIN.)
1 15.33 5.51
2 15.60 5.63
3 16.80 6.15
4 17.23 6.33
5 18.68 6.94
6 18.69 6.94
7 19.22 7.25
8 19.35 7.49
9 19.77 7.79
10 19.99 8.00
11 20.01 8.02
12 20.13 8.17
13 20.19 8.23
14 20.30 8.53
15 20.57 9.54
16 20.57 9.56
17 21.35 16.71
18 23.64 22.02
============================================================================ ============================================================================

END OF RATIONAL METHOD ANALYSIS

____________________________________________________________________________ ****************************************************************************

RATIONAL METHOD HYDROLOGY COMPUTER PROGRAM BASED ON

KHR Associates
17530 Von Karman Avenue
Irvine, CA 92626

************************** DESCRIPTION OF STUDY ************************** * IRON LOFTS * * POST-DEVELOPMENT HYDROLOGY - ON-SITE PLUS OFF-SITE RUNOFF * * 100-YEAR STORM EVENT * ************************************************************************** FILE NAME: RIL1-R10.DAT
TIME/DATE OF STUDY: 09:52 08/05/2024
---------------------------------------------------------------------------- USER SPECIFIED HYDROLOGY AND HYDRAULIC MODEL INFORMATION:
---------------------------------------------------------------------------- USER SPECIFIED STORM EVENT(YEAR) = 100.00
SPECIFIED MINIMUM PIPE SIZE(INCH) = 4.00
SPECIFIED PERCENT OF GRADIENTS(DECIMAL) TO USE FOR FRICTION SLOPE = 0.95 10-YEAR STORM 10-MINUTE INTENSITY(INCH/HOUR) = 2.140
10-YEAR STORM 60-MINUTE INTENSITY(INCH/HOUR) = 0.800
100-YEAR STORM 10-MINUTE INTENSITY(INCH/HOUR) = 3.210
100-YEAR STORM 60-MINUTE INTENSITY(INCH/HOUR) = 1.200
SLOPE OF 10-YEAR INTENSITY-DURATION CURVE = 0.5491525
SLOPE OF 100-YEAR INTENSITY-DURATION CURVE = 0.5491524 COMPUTED RAINFALL INTENSITY DATA:

STORM EVENT = 100.00 1-HOUR INTENSITY(INCH/HOUR) = 1.200 SLOPE OF INTENSITY DURATION CURVE = 0.5492
RCFC&WCD HYDROLOGY MANUAL "C"-VALUES USED FOR RATIONAL METHOD NOTE: CONSIDER ALL CONFLUENCE STREAM COMBINATIONS

FOR ALL DOWNSTREAM ANALYSES
*USER-DEFINED STREET-SECTIONS FOR COUPLED PIPEFLOW AND STREETFLOW MODEL* HALF- CROWN TO STREET-CROSSFALL: CURB GUTTER-GEOMETRIES: MANNING

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

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 124.00
UPSTREAM ELEVATION(FEET) = 879.50
DOWNSTREAM ELEVATION(FEET) = 877.89
ELEVATION DIFFERENCE(FEET) = 1.61
TC = 0.323*[( 124.00**3)/( 1.61)]**.2 = 5.290
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.554
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8791
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 1.48
TOTAL AREA(ACRES) = 0.37 TOTAL RUNOFF(CFS) = 1.48 **************************************************************************** FLOW PROCESS FROM NODE 2.00 TO NODE 2.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 1 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 2.00 TO NODE 2.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 3.00 TO NODE 4.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 5.11
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 6.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 1.00
PIPE TRAVEL TIME(MIN.) = 0.19 Tc(MIN.) = 5.19
LONGEST FLOWPATH FROM NODE 3.00 TO NODE 4.10 = 153.24 FEET. **************************************************************************** FLOW PROCESS FROM NODE 4.10 TO NODE 5.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 13.79 MANNING'S N = 0.009
DEPTH OF FLOW IN 8.0 INCH PIPE IS 4.4 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 5.07
GIVEN PIPE DIAMETER(INCH) = 8.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 1.00
PIPE TRAVEL TIME(MIN.) = 0.05 Tc(MIN.) = 5.24
LONGEST FLOWPATH FROM NODE 3.00 TO NODE 5.00 = 167.03 FEET. **************************************************************************** FLOW PROCESS FROM NODE 5.00 TO NODE 5.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 2 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 5.00 TO NODE 5.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 6.00 TO NODE 7.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 94.00
UPSTREAM ELEVATION(FEET) = 15.00
DOWNSTREAM ELEVATION(FEET) = 13.00
ELEVATION DIFFERENCE(FEET) = 2.00
TC = 0.323*[( 94.00**3)/( 2.00)]**.2 = 4.290
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.697
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8796
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 0.83
TOTAL AREA(ACRES) = 0.20 TOTAL RUNOFF(CFS) = 0.83 **************************************************************************** FLOW PROCESS FROM NODE 7.00 TO NODE 5.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 12.57 MANNING'S N = 0.009

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 9.52
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 4.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.83
PIPE TRAVEL TIME(MIN.) = 0.02 Tc(MIN.) = 5.02
LONGEST FLOWPATH FROM NODE 6.00 TO NODE 5.00 = 106.57 FEET. **************************************************************************** FLOW PROCESS FROM NODE 5.00 TO NODE 5.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 2 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 0.83 5.02 4.686 0.20
LONGEST FLOWPATH FROM NODE 6.00 TO NODE 5.00 = 106.57 FEET. ** MEMORY BANK # 2 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 1.00 5.24 4.577 0.24
LONGEST FLOWPATH FROM NODE 3.00 TO NODE 5.00 = 167.03 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 1.79 5.02 4.686
2 1.82 5.24 4.577
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 1.82 Tc(MIN.) = 5.24
TOTAL AREA(ACRES) = 0.4
**************************************************************************** FLOW PROCESS FROM NODE 5.00 TO NODE 5.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 2 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 7.10 TO NODE 7.10 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.577
UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .7959
SOIL CLASSIFICATION IS "C"
SUBAREA AREA(ACRES) = 0.10 SUBAREA RUNOFF(CFS) = 0.37 TOTAL AREA(ACRES) = 0.5 TOTAL RUNOFF(CFS) = 2.19 TC(MIN.) = 5.24
**************************************************************************** FLOW PROCESS FROM NODE 5.00 TO NODE 2.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 78.38 MANNING'S N = 0.009

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 6.26
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 8.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 2.19
PIPE TRAVEL TIME(MIN.) = 0.21 Tc(MIN.) = 5.45
LONGEST FLOWPATH FROM NODE 3.00 TO NODE 2.00 = 245.41 FEET. **************************************************************************** FLOW PROCESS FROM NODE 2.00 TO NODE 2.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 1 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 2.17 5.23 4.582 0.55
2 2.19 5.45 4.480 0.55
LONGEST FLOWPATH FROM NODE 3.00 TO NODE 2.00 = 245.41 FEET. ** MEMORY BANK # 1 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 1.48 5.29 4.554 0.37
LONGEST FLOWPATH FROM NODE 1.00 TO NODE 2.00 = 124.00 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 3.64 5.23 4.582
2 3.64 5.29 4.554
3 3.64 5.45 4.480
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 3.64 Tc(MIN.) = 5.45
TOTAL AREA(ACRES) = 0.9
**************************************************************************** FLOW PROCESS FROM NODE 2.00 TO NODE 2.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 1 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 2.00 TO NODE 8.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 145.73 MANNING'S N = 0.009

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 6.68
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 10.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 3.64
PIPE TRAVEL TIME(MIN.) = 0.36 Tc(MIN.) = 5.81
LONGEST FLOWPATH FROM NODE 3.00 TO NODE 8.00 = 391.14 FEET. **************************************************************************** FLOW PROCESS FROM NODE 8.00 TO NODE 8.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 1 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 8.00 TO NODE 8.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 9.00 TO NODE 10.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 71.61
UPSTREAM ELEVATION(FEET) = 15.00
DOWNSTREAM ELEVATION(FEET) = 13.00
ELEVATION DIFFERENCE(FEET) = 2.00
TC = 0.323*[( 71.61**3)/( 2.00)]**.2 = 3.644
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.697
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8796
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 0.84
TOTAL AREA(ACRES) = 0.20 TOTAL RUNOFF(CFS) = 0.84 **************************************************************************** FLOW PROCESS FROM NODE 10.00 TO NODE 10.10 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 45.35 MANNING'S N = 0.009

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 9.61
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 4.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.84
PIPE TRAVEL TIME(MIN.) = 0.08 Tc(MIN.) = 5.08
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 10.10 = 116.96 FEET. **************************************************************************** FLOW PROCESS FROM NODE 10.10 TO NODE 10.20 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 37.68 MANNING'S N = 0.009

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 4.27
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 6.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.84
PIPE TRAVEL TIME(MIN.) = 0.15 Tc(MIN.) = 5.23
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 10.20 = 154.64 FEET. **************************************************************************** FLOW PROCESS FROM NODE 10.20 TO NODE 10.20 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 3 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 10.20 TO NODE 10.20 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 10.30 TO NODE 10.40 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 3.15
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 4.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.28
PIPE TRAVEL TIME(MIN.) = 0.05 Tc(MIN.) = 6.27
LONGEST FLOWPATH FROM NODE 10.30 TO NODE 10.20 = 25.88 FEET. **************************************************************************** FLOW PROCESS FROM NODE 10.20 TO NODE 10.20 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 3 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 0.28 6.27 4.147 0.08
LONGEST FLOWPATH FROM NODE 10.30 TO NODE 10.20 = 25.88 FEET. ** MEMORY BANK # 3 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 0.84 5.23 4.584 0.20
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 10.20 = 154.64 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 1.07 5.23 4.584
2 1.03 6.27 4.147
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 1.07 Tc(MIN.) = 5.23
TOTAL AREA(ACRES) = 0.3
**************************************************************************** FLOW PROCESS FROM NODE 10.20 TO NODE 10.20 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 3 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 10.20 TO NODE 10.50 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 131.52 MANNING'S N = 0.009

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 5.44
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 6.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 1.07
PIPE TRAVEL TIME(MIN.) = 0.40 Tc(MIN.) = 5.63
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 10.50 = 286.16 FEET. **************************************************************************** FLOW PROCESS FROM NODE 10.50 TO NODE 10.50 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.401
UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .7922
SOIL CLASSIFICATION IS "C"
SUBAREA AREA(ACRES) = 0.10 SUBAREA RUNOFF(CFS) = 0.35 TOTAL AREA(ACRES) = 0.4 TOTAL RUNOFF(CFS) = 1.42 TC(MIN.) = 5.63
**************************************************************************** FLOW PROCESS FROM NODE 10.50 TO NODE 8.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 137.41 MANNING'S N = 0.009
DEPTH OF FLOW IN 8.0 INCH PIPE IS 5.6 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 5.47
GIVEN PIPE DIAMETER(INCH) = 8.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 1.42
PIPE TRAVEL TIME(MIN.) = 0.42 Tc(MIN.) = 6.05
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 8.00 = 423.57 FEET. **************************************************************************** FLOW PROCESS FROM NODE 8.00 TO NODE 8.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 1 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 1.42 6.05 4.231 0.39
2 1.35 7.11 3.870 0.39
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 8.00 = 423.57 FEET. ** MEMORY BANK # 1 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 3.64 5.60 4.415 0.92
2 3.64 5.65 4.390 0.92
3 3.64 5.81 4.324 0.92
LONGEST FLOWPATH FROM NODE 3.00 TO NODE 8.00 = 391.14 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 4.95 5.60 4.415
2 4.97 5.65 4.390
3 5.01 5.81 4.324
4 4.98 6.05 4.231
5 4.61 7.11 3.870
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 5.01 Tc(MIN.) = 5.81
TOTAL AREA(ACRES) = 1.3
**************************************************************************** FLOW PROCESS FROM NODE 8.00 TO NODE 8.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 1 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 8.00 TO NODE 13.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 38.12 MANNING'S N = 0.009

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 9.18
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 10.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 5.01
PIPE TRAVEL TIME(MIN.) = 0.07 Tc(MIN.) = 5.88
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 13.00 = 461.69 FEET. **************************************************************************** FLOW PROCESS FROM NODE 13.00 TO NODE 13.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 1 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 13.00 TO NODE 13.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 11.00 TO NODE 12.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 36.94
UPSTREAM ELEVATION(FEET) = 15.00
DOWNSTREAM ELEVATION(FEET) = 13.00
ELEVATION DIFFERENCE(FEET) = 2.00
TC = 0.323*[( 36.94**3)/( 2.00)]**.2 = 2.450
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.697
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8796
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 0.21
TOTAL AREA(ACRES) = 0.05 TOTAL RUNOFF(CFS) = 0.21 **************************************************************************** FLOW PROCESS FROM NODE 12.00 TO NODE 13.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 41.32 MANNING'S N = 0.009
DEPTH OF FLOW IN 4.0 INCH PIPE IS 2.7 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 3.34
GIVEN PIPE DIAMETER(INCH) = 4.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.21
PIPE TRAVEL TIME(MIN.) = 0.21 Tc(MIN.) = 5.21
LONGEST FLOWPATH FROM NODE 11.00 TO NODE 13.00 = 78.26 FEET. **************************************************************************** FLOW PROCESS FROM NODE 13.00 TO NODE 13.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 1 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 0.21 5.21 4.594 0.05
LONGEST FLOWPATH FROM NODE 11.00 TO NODE 13.00 = 78.26 FEET. ** MEMORY BANK # 1 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 4.95 5.67 4.385 1.30
2 4.97 5.72 4.361 1.30
3 5.01 5.88 4.296 1.30
4 4.98 6.12 4.205 1.30
5 4.61 7.19 3.848 1.30
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 13.00 = 461.69 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 4.75 5.21 4.594
2 5.15 5.67 4.385
3 5.16 5.72 4.361
4 5.20 5.88 4.296
5 5.17 6.12 4.205
6 4.78 7.19 3.848
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 5.20 Tc(MIN.) = 5.88
TOTAL AREA(ACRES) = 1.4
**************************************************************************** FLOW PROCESS FROM NODE 13.00 TO NODE 13.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 1 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 13.00 TO NODE 13.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 1 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 13.00 TO NODE 13.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 14.00 TO NODE 15.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 282.36
UPSTREAM ELEVATION(FEET) = 881.50
DOWNSTREAM ELEVATION(FEET) = 877.80
ELEVATION DIFFERENCE(FEET) = 3.70
TC = 0.323*[( 282.36**3)/( 3.70)]**.2 = 7.339
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.804
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8755
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 4.41
TOTAL AREA(ACRES) = 1.32 TOTAL RUNOFF(CFS) = 4.41 **************************************************************************** FLOW PROCESS FROM NODE 15.00 TO NODE 15.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 1 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 4.41 7.34 3.804 1.32
LONGEST FLOWPATH FROM NODE 14.00 TO NODE 15.00 = 282.36 FEET. ** MEMORY BANK # 1 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 4.75 5.21 4.594 1.35
2 5.15 5.67 4.385 1.35
3 5.16 5.72 4.361 1.35
4 5.20 5.88 4.296 1.35
5 5.17 6.12 4.205 1.35
6 4.78 7.19 3.848 1.35
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 15.00 = 461.69 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 7.88 5.21 4.594
2 8.55 5.67 4.385
3 8.60 5.72 4.361
4 8.73 5.88 4.296
5 8.84 6.12 4.205
6 9.10 7.19 3.848
7 9.13 7.34 3.804
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 9.13 Tc(MIN.) = 7.34
TOTAL AREA(ACRES) = 2.7
**************************************************************************** FLOW PROCESS FROM NODE 15.00 TO NODE 15.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 1 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 15.00 TO NODE 15.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 1 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 15.00 TO NODE 15.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 16.00 TO NODE 17.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 74.23
UPSTREAM ELEVATION(FEET) = 15.00
DOWNSTREAM ELEVATION(FEET) = 13.00
ELEVATION DIFFERENCE(FEET) = 2.00
TC = 0.323*[( 74.23**3)/( 2.00)]**.2 = 3.723
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.697
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8796
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 1.19
TOTAL AREA(ACRES) = 0.29 TOTAL RUNOFF(CFS) = 1.19 **************************************************************************** FLOW PROCESS FROM NODE 17.00 TO NODE 17.10 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 15.20 MANNING'S N = 0.009

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 13.68
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 4.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 1.19
PIPE TRAVEL TIME(MIN.) = 0.02 Tc(MIN.) = 5.02
LONGEST FLOWPATH FROM NODE 16.00 TO NODE 17.10 = 89.43 FEET. **************************************************************************** FLOW PROCESS FROM NODE 17.00 TO NODE 18.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 164.51 MANNING'S N = 0.009
DEPTH OF FLOW IN 8.0 INCH PIPE IS 4.9 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 5.27
GIVEN PIPE DIAMETER(INCH) = 8.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 1.19
PIPE TRAVEL TIME(MIN.) = 0.52 Tc(MIN.) = 5.54
LONGEST FLOWPATH FROM NODE 16.00 TO NODE 18.00 = 253.94 FEET. **************************************************************************** FLOW PROCESS FROM NODE 18.00 TO NODE 18.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 2 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 18.00 TO NODE 18.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 19.00 TO NODE 20.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 147.00
UPSTREAM ELEVATION(FEET) = 881.00
DOWNSTREAM ELEVATION(FEET) = 878.08
ELEVATION DIFFERENCE(FEET) = 2.92
TC = 0.323*[( 147.00**3)/( 2.92)]**.2 = 5.201
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.596
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8792
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 1.27
TOTAL AREA(ACRES) = 0.31 TOTAL RUNOFF(CFS) = 1.27 **************************************************************************** FLOW PROCESS FROM NODE 20.00 TO NODE 20.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 2 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 1.27 5.20 4.596 0.31
LONGEST FLOWPATH FROM NODE 19.00 TO NODE 20.00 = 147.00 FEET. ** MEMORY BANK # 2 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 1.19 5.54 4.440 0.29
LONGEST FLOWPATH FROM NODE 16.00 TO NODE 20.00 = 253.94 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 2.39 5.20 4.596
2 2.42 5.54 4.440
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 2.42 Tc(MIN.) = 5.54
TOTAL AREA(ACRES) = 0.6
**************************************************************************** FLOW PROCESS FROM NODE 20.00 TO NODE 20.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 2 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 20.00 TO NODE 21.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 35.92 MANNING'S N = 0.009

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 12.34
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 6.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 2.42
PIPE TRAVEL TIME(MIN.) = 0.05 Tc(MIN.) = 5.59
LONGEST FLOWPATH FROM NODE 16.00 TO NODE 21.00 = 289.86 FEET. **************************************************************************** FLOW PROCESS FROM NODE 21.00 TO NODE 21.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 2 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 21.00 TO NODE 21.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 22.00 TO NODE 23.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM
DEVELOPMENT IS: UNDEVELOPED WITH GOOD COVER
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 77.86
UPSTREAM ELEVATION(FEET) = 881.47
DOWNSTREAM ELEVATION(FEET) = 880.67
ELEVATION DIFFERENCE(FEET) = 0.80
TC = 0.937*[( 77.86**3)/( 0.80)]**.2 = 13.369
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.737
UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .7384
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 0.20
TOTAL AREA(ACRES) = 0.10 TOTAL RUNOFF(CFS) = 0.20 **************************************************************************** FLOW PROCESS FROM NODE 23.00 TO NODE 21.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 107.21 MANNING'S N = 0.009
DEPTH OF FLOW IN 6.0 INCH PIPE IS 2.1 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 3.40
GIVEN PIPE DIAMETER(INCH) = 6.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.20
PIPE TRAVEL TIME(MIN.) = 0.53 Tc(MIN.) = 13.90
LONGEST FLOWPATH FROM NODE 22.00 TO NODE 21.00 = 185.07 FEET. **************************************************************************** FLOW PROCESS FROM NODE 21.00 TO NODE 21.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 2 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 0.20 13.90 2.679 0.10
LONGEST FLOWPATH FROM NODE 22.00 TO NODE 21.00 = 185.07 FEET. ** MEMORY BANK # 2 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 2.39 5.25 4.573 0.60
2 2.42 5.59 4.419 0.60
LONGEST FLOWPATH FROM NODE 16.00 TO NODE 21.00 = 289.86 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 2.47 5.25 4.573
2 2.51 5.59 4.419
3 1.67 13.90 2.679
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 2.51 Tc(MIN.) = 5.59
TOTAL AREA(ACRES) = 0.7
**************************************************************************** FLOW PROCESS FROM NODE 21.00 TO NODE 21.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 2 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 21.00 TO NODE 24.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 136.64 MANNING'S N = 0.009

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 12.76
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 6.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 2.51
PIPE TRAVEL TIME(MIN.) = 0.18 Tc(MIN.) = 5.77
LONGEST FLOWPATH FROM NODE 16.00 TO NODE 24.00 = 426.50 FEET. **************************************************************************** FLOW PROCESS FROM NODE 24.00 TO NODE 24.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 1 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 2.47 5.43 4.488 0.70
2 2.51 5.77 4.344 0.70
3 1.67 14.16 2.652 0.70
LONGEST FLOWPATH FROM NODE 16.00 TO NODE 24.00 = 426.50 FEET. ** MEMORY BANK # 1 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 7.88 5.21 4.594 2.68
2 8.55 5.67 4.385 2.68
3 8.60 5.72 4.361 2.68
4 8.73 5.88 4.296 2.68
5 8.84 6.12 4.205 2.68
6 9.10 7.19 3.848 2.68
7 9.13 7.34 3.804 2.68
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 24.00 = 461.69 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 10.25 5.21 4.594
2 10.67 5.43 4.488
3 11.01 5.67 4.385
4 11.09 5.72 4.361
5 11.07 5.77 4.344
6 11.21 5.88 4.296
7 11.27 6.12 4.205
8 11.32 7.19 3.848
9 11.33 7.34 3.804
10 8.04 14.16 2.652
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 11.33 Tc(MIN.) = 7.34
TOTAL AREA(ACRES) = 3.4
**************************************************************************** FLOW PROCESS FROM NODE 24.00 TO NODE 24.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 1 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 24.00 TO NODE 25.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 55.93 MANNING'S N = 0.009

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 57.70
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 6.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 11.33
PIPE TRAVEL TIME(MIN.) = 0.02 Tc(MIN.) = 7.36
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 25.00 = 517.62 FEET. **************************************************************************** FLOW PROCESS FROM NODE 26.00 TO NODE 27.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0040
FLOW LENGTH(FEET) = 255.17 MANNING'S N = 0.010

ASSUMED INITIAL SUBAREA UNIFORM
DEVELOPMENT IS SINGLE FAMILY (1/4 ACRE)
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 2313.53
UPSTREAM ELEVATION(FEET) = 910.75
DOWNSTREAM ELEVATION(FEET) = 881.40
ELEVATION DIFFERENCE(FEET) = 29.35
TC = 0.393*[( 2313.53**3)/( 29.35)]**.2 = 20.845
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.145
SINGLE-FAMILY(1/4 ACRE LOT) RUNOFF COEFFICIENT = .8017
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 22.71
TOTAL AREA(ACRES) = 13.21 TOTAL RUNOFF(CFS) = 22.71 **************************************************************************** FLOW PROCESS FROM NODE 27.30 TO NODE 27.40 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0125
FLOW LENGTH(FEET) = 22.90 MANNING'S N = 0.013
DEPTH OF FLOW IN 24.0 INCH PIPE IS 18.2 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 8.90
GIVEN PIPE DIAMETER(INCH) = 24.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 22.71
PIPE TRAVEL TIME(MIN.) = 0.04 Tc(MIN.) = 20.89
LONGEST FLOWPATH FROM NODE 27.20 TO NODE 27.40 = 2336.43 FEET. **************************************************************************** FLOW PROCESS FROM NODE 27.40 TO NODE 27.50 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0150
FLOW LENGTH(FEET) = 221.35 MANNING'S N = 0.013
DEPTH OF FLOW IN 24.0 INCH PIPE IS 16.9 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 9.63
GIVEN PIPE DIAMETER(INCH) = 24.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 22.71
PIPE TRAVEL TIME(MIN.) = 0.38 Tc(MIN.) = 21.27
LONGEST FLOWPATH FROM NODE 27.20 TO NODE 27.50 = 2557.78 FEET. **************************************************************************** FLOW PROCESS FROM NODE 27.50 TO NODE 27.10 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0150
FLOW LENGTH(FEET) = 106.50 MANNING'S N = 0.013
DEPTH OF FLOW IN 24.0 INCH PIPE IS 16.9 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 9.63
GIVEN PIPE DIAMETER(INCH) = 24.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 22.71
PIPE TRAVEL TIME(MIN.) = 0.18 Tc(MIN.) = 21.45
LONGEST FLOWPATH FROM NODE 27.20 TO NODE 27.10 = 2664.28 FEET. **************************************************************************** FLOW PROCESS FROM NODE 27.10 TO NODE 27.10 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 1 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 22.71 21.45 2.111 13.21
LONGEST FLOWPATH FROM NODE 27.20 TO NODE 27.10 = 2664.28 FEET. ** MEMORY BANK # 1 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 10.25 6.76 3.980 3.38
2 10.67 6.93 3.927 3.38
3 11.01 7.11 3.870 3.38
4 11.09 7.16 3.856 3.38
5 11.07 7.21 3.843 3.38
6 11.21 7.30 3.814 3.38
7 11.27 7.53 3.751 3.38
8 11.32 8.60 3.488 3.38
9 11.33 8.75 3.455 3.38
10 8.04 15.83 2.494 3.38
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 27.10 = 1052.76 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 17.41 6.76 3.980
2 18.00 6.93 3.927
3 18.54 7.11 3.870
4 18.67 7.16 3.856
5 18.70 7.21 3.843
6 18.94 7.30 3.814
7 19.24 7.53 3.751
8 20.42 8.60 3.488
9 20.59 8.75 3.455
10 24.80 15.83 2.494
11 29.63 21.45 2.111
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 29.63 Tc(MIN.) = 21.45
TOTAL AREA(ACRES) = 16.6
**************************************************************************** FLOW PROCESS FROM NODE 27.10 TO NODE 27.10 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 1 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 27.10 TO NODE 28.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0040
FLOW LENGTH(FEET) = 71.25 MANNING'S N = 0.013
DEPTH OF FLOW IN 36.0 INCH PIPE IS 22.6 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 6.33
GIVEN PIPE DIAMETER(INCH) = 36.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 29.63
PIPE TRAVEL TIME(MIN.) = 0.19 Tc(MIN.) = 21.64
LONGEST FLOWPATH FROM NODE 27.20 TO NODE 28.00 = 2735.53 FEET. **************************************************************************** FLOW PROCESS FROM NODE 28.00 TO NODE 28.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 1 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 28.00 TO NODE 28.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 29.00 TO NODE 30.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 61.88
UPSTREAM ELEVATION(FEET) = 882.80
DOWNSTREAM ELEVATION(FEET) = 882.10
ELEVATION DIFFERENCE(FEET) = 0.70
TC = 0.323*[( 61.88**3)/( 0.70)]**.2 = 4.118
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.697
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8796
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 0.68
TOTAL AREA(ACRES) = 0.16 TOTAL RUNOFF(CFS) = 0.68 **************************************************************************** FLOW PROCESS FROM NODE 30.00 TO NODE 31.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 55.57 MANNING'S N = 0.009

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 7.76
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 4.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.68
PIPE TRAVEL TIME(MIN.) = 0.12 Tc(MIN.) = 5.12
LONGEST FLOWPATH FROM NODE 29.00 TO NODE 31.00 = 117.45 FEET. **************************************************************************** FLOW PROCESS FROM NODE 31.00 TO NODE 32.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 89.09 MANNING'S N = 0.009
DEPTH OF FLOW IN 6.0 INCH PIPE IS 4.3 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 4.51
GIVEN PIPE DIAMETER(INCH) = 6.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.68
PIPE TRAVEL TIME(MIN.) = 0.33 Tc(MIN.) = 5.45
LONGEST FLOWPATH FROM NODE 29.00 TO NODE 32.00 = 206.54 FEET. **************************************************************************** FLOW PROCESS FROM NODE 32.00 TO NODE 33.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 23.50 MANNING'S N = 0.009
DEPTH OF FLOW IN 8.0 INCH PIPE IS 3.5 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 4.58
GIVEN PIPE DIAMETER(INCH) = 8.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.68
PIPE TRAVEL TIME(MIN.) = 0.09 Tc(MIN.) = 5.53
LONGEST FLOWPATH FROM NODE 29.00 TO NODE 33.00 = 230.04 FEET. **************************************************************************** FLOW PROCESS FROM NODE 33.00 TO NODE 33.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 3 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 33.00 TO NODE 33.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 34.00 TO NODE 35.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 4.40
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 4.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.38
PIPE TRAVEL TIME(MIN.) = 0.01 Tc(MIN.) = 5.01
LONGEST FLOWPATH FROM NODE 34.00 TO NODE 33.00 = 67.92 FEET. **************************************************************************** FLOW PROCESS FROM NODE 33.00 TO NODE 33.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 3 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 0.38 5.01 4.693 0.09
LONGEST FLOWPATH FROM NODE 34.00 TO NODE 33.00 = 67.92 FEET. ** MEMORY BANK # 3 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 0.68 5.53 4.442 0.16
LONGEST FLOWPATH FROM NODE 29.00 TO NODE 33.00 = 230.04 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 1.00 5.01 4.693
2 1.04 5.53 4.442
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 1.04 Tc(MIN.) = 5.53
TOTAL AREA(ACRES) = 0.3
**************************************************************************** FLOW PROCESS FROM NODE 33.00 TO NODE 33.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 3 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 33.00 TO NODE 36.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 48.57 MANNING'S N = 0.009
DEPTH OF FLOW IN 8.0 INCH PIPE IS 4.5 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 5.11
GIVEN PIPE DIAMETER(INCH) = 8.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 1.04
PIPE TRAVEL TIME(MIN.) = 0.16 Tc(MIN.) = 5.69
LONGEST FLOWPATH FROM NODE 29.00 TO NODE 36.00 = 278.61 FEET. **************************************************************************** FLOW PROCESS FROM NODE 36.00 TO NODE 36.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 3 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 34.00 TO NODE 34.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 37.00 TO NODE 38.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM
DEVELOPMENT IS: UNDEVELOPED WITH GOOD COVER
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 47.00
UPSTREAM ELEVATION(FEET) = 879.59
DOWNSTREAM ELEVATION(FEET) = 878.75
ELEVATION DIFFERENCE(FEET) = 0.84
TC = 0.937*[( 47.00**3)/( 0.84)]**.2 = 9.780
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.250
UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .7599
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 0.22
TOTAL AREA(ACRES) = 0.09 TOTAL RUNOFF(CFS) = 0.22 **************************************************************************** FLOW PROCESS FROM NODE 38.00 TO NODE 36.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 14.50 MANNING'S N = 0.009
DEPTH OF FLOW IN 10.0 INCH PIPE IS 1.8 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 3.25
GIVEN PIPE DIAMETER(INCH) = 10.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.22
PIPE TRAVEL TIME(MIN.) = 0.07 Tc(MIN.) = 9.85
LONGEST FLOWPATH FROM NODE 37.00 TO NODE 36.00 = 61.50 FEET. **************************************************************************** FLOW PROCESS FROM NODE 36.00 TO NODE 36.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 3 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 0.22 9.85 3.236 0.09
LONGEST FLOWPATH FROM NODE 37.00 TO NODE 36.00 = 61.50 FEET. ** MEMORY BANK # 3 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 1.00 5.17 4.613 0.26
2 1.04 5.69 4.374 0.26
LONGEST FLOWPATH FROM NODE 29.00 TO NODE 36.00 = 278.61 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 1.11 5.17 4.613
2 1.17 5.69 4.374
3 0.99 9.85 3.236
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 1.17 Tc(MIN.) = 5.69
TOTAL AREA(ACRES) = 0.3
**************************************************************************** FLOW PROCESS FROM NODE 36.00 TO NODE 39.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 52.84 MANNING'S N = 0.009
DEPTH OF FLOW IN 10.0 INCH PIPE IS 4.3 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 5.27
GIVEN PIPE DIAMETER(INCH) = 10.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 1.17
PIPE TRAVEL TIME(MIN.) = 0.17 Tc(MIN.) = 5.86
LONGEST FLOWPATH FROM NODE 29.00 TO NODE 39.00 = 331.45 FEET. **************************************************************************** FLOW PROCESS FROM NODE 39.00 TO NODE 39.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 3 <<<<< ============================================================================ ***MEMORY BANK # 3 IS FULL. THEREFORE, MAIN-STREAM MEMORY DATA CAN NOT BE COPIED ONTO IT - PROCESS IGNORED.***
**************************************************************************** FLOW PROCESS FROM NODE 39.00 TO NODE 39.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 40.00 TO NODE 41.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 74.92
UPSTREAM ELEVATION(FEET) = 15.00
DOWNSTREAM ELEVATION(FEET) = 13.00
ELEVATION DIFFERENCE(FEET) = 2.00
TC = 0.323*[( 74.92**3)/( 2.00)]**.2 = 3.744
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.697
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8796
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 1.67
TOTAL AREA(ACRES) = 0.40 TOTAL RUNOFF(CFS) = 1.67 **************************************************************************** FLOW PROCESS FROM NODE 41.00 TO NODE 39.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 7.00 MANNING'S N = 0.009

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 19.13
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 4.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 1.67
PIPE TRAVEL TIME(MIN.) = 0.01 Tc(MIN.) = 5.01
LONGEST FLOWPATH FROM NODE 40.00 TO NODE 39.00 = 81.92 FEET. **************************************************************************** FLOW PROCESS FROM NODE 39.00 TO NODE 39.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 3 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 1.67 5.01 4.694 0.40
LONGEST FLOWPATH FROM NODE 40.00 TO NODE 39.00 = 81.92 FEET. ** MEMORY BANK # 3 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 1.00 5.17 4.613 0.26
2 1.04 5.69 4.374 0.26
LONGEST FLOWPATH FROM NODE 29.00 TO NODE 39.00 = 278.61 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 2.64 5.01 4.694
2 2.64 5.17 4.613
3 2.60 5.69 4.374
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 2.64 Tc(MIN.) = 5.17
TOTAL AREA(ACRES) = 0.7
**************************************************************************** FLOW PROCESS FROM NODE 39.00 TO NODE 39.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 3 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 39.00 TO NODE 42.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 52.87 MANNING'S N = 0.009
DEPTH OF FLOW IN 10.0 INCH PIPE IS 7.1 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 6.35
GIVEN PIPE DIAMETER(INCH) = 10.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 2.64
PIPE TRAVEL TIME(MIN.) = 0.14 Tc(MIN.) = 5.31
LONGEST FLOWPATH FROM NODE 29.00 TO NODE 42.00 = 331.48 FEET. **************************************************************************** FLOW PROCESS FROM NODE 42.00 TO NODE 43.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 91.61 MANNING'S N = 0.010
DEPTH OF FLOW IN 12.0 INCH PIPE IS 6.6 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 5.97
GIVEN PIPE DIAMETER(INCH) = 12.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 2.64
PIPE TRAVEL TIME(MIN.) = 0.26 Tc(MIN.) = 5.56
LONGEST FLOWPATH FROM NODE 29.00 TO NODE 43.00 = 423.09 FEET. **************************************************************************** FLOW PROCESS FROM NODE 43.00 TO NODE 43.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 3 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 43.00 TO NODE 43.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 44.00 TO NODE 45.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 47.00
UPSTREAM ELEVATION(FEET) = 15.00
DOWNSTREAM ELEVATION(FEET) = 13.00
ELEVATION DIFFERENCE(FEET) = 2.00
TC = 0.323*[( 47.00**3)/( 2.00)]**.2 = 2.830
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.697
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8796
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 1.46
TOTAL AREA(ACRES) = 0.35 TOTAL RUNOFF(CFS) = 1.46 **************************************************************************** FLOW PROCESS FROM NODE 45.00 TO NODE 46.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 32.65 MANNING'S N = 0.009

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 7.43
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 6.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 1.46
PIPE TRAVEL TIME(MIN.) = 0.07 Tc(MIN.) = 5.07
LONGEST FLOWPATH FROM NODE 44.00 TO NODE 46.00 = 79.65 FEET. **************************************************************************** FLOW PROCESS FROM NODE 46.00 TO NODE 47.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 231.00 MANNING'S N = 0.009
DEPTH OF FLOW IN 8.0 INCH PIPE IS 5.7 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 5.49
GIVEN PIPE DIAMETER(INCH) = 8.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 1.46
PIPE TRAVEL TIME(MIN.) = 0.70 Tc(MIN.) = 5.77
LONGEST FLOWPATH FROM NODE 44.00 TO NODE 47.00 = 310.65 FEET. **************************************************************************** FLOW PROCESS FROM NODE 47.00 TO NODE 47.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.340
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8782
SOIL CLASSIFICATION IS "C"
SUBAREA AREA(ACRES) = 0.22 SUBAREA RUNOFF(CFS) = 0.85 TOTAL AREA(ACRES) = 0.6 TOTAL RUNOFF(CFS) = 2.31 TC(MIN.) = 5.77
**************************************************************************** FLOW PROCESS FROM NODE 47.00 TO NODE 48.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 40.21 MANNING'S N = 0.009

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 6.61
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 8.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 2.31
PIPE TRAVEL TIME(MIN.) = 0.10 Tc(MIN.) = 5.88
LONGEST FLOWPATH FROM NODE 44.00 TO NODE 48.00 = 350.86 FEET. **************************************************************************** FLOW PROCESS FROM NODE 48.00 TO NODE 48.00 IS CODE = 81 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<<
============================================================================ 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.298
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8780
SOIL CLASSIFICATION IS "C"
SUBAREA AREA(ACRES) = 0.29 SUBAREA RUNOFF(CFS) = 1.09 TOTAL AREA(ACRES) = 0.9 TOTAL RUNOFF(CFS) = 3.40 TC(MIN.) = 5.88
**************************************************************************** FLOW PROCESS FROM NODE 48.00 TO NODE 43.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 98.04 MANNING'S N = 0.009

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 9.73
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 8.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 3.40
PIPE TRAVEL TIME(MIN.) = 0.17 Tc(MIN.) = 6.04
LONGEST FLOWPATH FROM NODE 44.00 TO NODE 43.00 = 448.90 FEET. **************************************************************************** FLOW PROCESS FROM NODE 43.00 TO NODE 43.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 3 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 3.40 6.04 4.232 0.86
LONGEST FLOWPATH FROM NODE 44.00 TO NODE 43.00 = 448.90 FEET. ** MEMORY BANK # 3 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 2.64 5.40 4.502 0.66
2 2.64 5.56 4.430 0.66
3 2.60 6.09 4.215 0.66
LONGEST FLOWPATH FROM NODE 29.00 TO NODE 43.00 = 423.09 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 5.67 5.40 4.502
2 5.76 5.56 4.430
3 5.97 6.04 4.232
4 5.98 6.09 4.215
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 5.98 Tc(MIN.) = 6.09
TOTAL AREA(ACRES) = 1.5
**************************************************************************** FLOW PROCESS FROM NODE 43.00 TO NODE 43.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 3 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 43.00 TO NODE 49.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 33.92 MANNING'S N = 0.010

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 7.61
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 12.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 5.98
PIPE TRAVEL TIME(MIN.) = 0.07 Tc(MIN.) = 6.16
LONGEST FLOWPATH FROM NODE 44.00 TO NODE 49.00 = 482.82 FEET. **************************************************************************** FLOW PROCESS FROM NODE 49.00 TO NODE 49.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 2 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 49.00 TO NODE 49.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 50.00 TO NODE 51.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 97.11
UPSTREAM ELEVATION(FEET) = 878.85
DOWNSTREAM ELEVATION(FEET) = 877.75
ELEVATION DIFFERENCE(FEET) = 1.10
TC = 0.323*[( 97.11**3)/( 1.10)]**.2 = 4.930
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.697
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8796
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 1.39
TOTAL AREA(ACRES) = 0.34 TOTAL RUNOFF(CFS) = 1.39 **************************************************************************** FLOW PROCESS FROM NODE 51.00 TO NODE 51.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 2 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 1.39 5.00 4.697 0.34
LONGEST FLOWPATH FROM NODE 50.00 TO NODE 51.00 = 97.11 FEET. ** MEMORY BANK # 2 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 5.67 5.48 4.467 1.52
2 5.76 5.64 4.397 1.52
3 5.97 6.12 4.204 1.52
4 5.98 6.16 4.187 1.52
LONGEST FLOWPATH FROM NODE 44.00 TO NODE 51.00 = 482.82 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 6.57 5.00 4.697
2 6.99 5.48 4.467
3 7.07 5.64 4.397
4 7.22 6.12 4.204
5 7.22 6.16 4.187
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 7.22 Tc(MIN.) = 6.16
TOTAL AREA(ACRES) = 1.9
**************************************************************************** FLOW PROCESS FROM NODE 51.00 TO NODE 51.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 2 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 51.00 TO NODE 52.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 51.05 MANNING'S N = 0.010
DEPTH OF FLOW IN 15.0 INCH PIPE IS 10.9 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 7.53
GIVEN PIPE DIAMETER(INCH) = 15.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 7.22
PIPE TRAVEL TIME(MIN.) = 0.11 Tc(MIN.) = 6.28
LONGEST FLOWPATH FROM NODE 44.00 TO NODE 52.00 = 533.87 FEET. **************************************************************************** FLOW PROCESS FROM NODE 52.00 TO NODE 52.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 2 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 52.00 TO NODE 52.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 53.00 TO NODE 54.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 96.84
UPSTREAM ELEVATION(FEET) = 878.85
DOWNSTREAM ELEVATION(FEET) = 877.60
ELEVATION DIFFERENCE(FEET) = 1.25
TC = 0.323*[( 96.84**3)/( 1.25)]**.2 = 4.798
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.697
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8796
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 1.28
TOTAL AREA(ACRES) = 0.31 TOTAL RUNOFF(CFS) = 1.28 **************************************************************************** FLOW PROCESS FROM NODE 54.00 TO NODE 54.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 3 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 54.00 TO NODE 54.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 55.00 TO NODE 56.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 217.19
UPSTREAM ELEVATION(FEET) = 881.21
DOWNSTREAM ELEVATION(FEET) = 878.03
ELEVATION DIFFERENCE(FEET) = 3.18
TC = 0.323*[( 217.19**3)/( 3.18)]**.2 = 6.463
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.080
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8770
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 4.00
TOTAL AREA(ACRES) = 1.12 TOTAL RUNOFF(CFS) = 4.00 **************************************************************************** FLOW PROCESS FROM NODE 56.00 TO NODE 57.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 140.51 MANNING'S N = 0.009

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 11.45
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 8.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 4.00
PIPE TRAVEL TIME(MIN.) = 0.20 Tc(MIN.) = 6.67
LONGEST FLOWPATH FROM NODE 55.00 TO NODE 57.00 = 357.70 FEET. **************************************************************************** FLOW PROCESS FROM NODE 57.00 TO NODE 57.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 3 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 4.00 6.67 4.010 1.12
LONGEST FLOWPATH FROM NODE 55.00 TO NODE 57.00 = 357.70 FEET. ** MEMORY BANK # 3 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 1.28 5.00 4.697 0.31
LONGEST FLOWPATH FROM NODE 53.00 TO NODE 57.00 = 96.84 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 4.28 5.00 4.697
2 5.09 6.67 4.010
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 5.09 Tc(MIN.) = 6.67
TOTAL AREA(ACRES) = 1.4
**************************************************************************** FLOW PROCESS FROM NODE 57.00 TO NODE 57.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 2 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 4.28 5.00 4.697 1.43
2 5.09 6.67 4.010 1.43
LONGEST FLOWPATH FROM NODE 55.00 TO NODE 57.00 = 357.70 FEET. ** MEMORY BANK # 2 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 6.57 5.11 4.639 1.86
2 6.99 5.59 4.417 1.86
3 7.07 5.75 4.349 1.86
4 7.22 6.23 4.162 1.86
5 7.22 6.28 4.146 1.86
LONGEST FLOWPATH FROM NODE 44.00 TO NODE 57.00 = 533.87 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 10.70 5.00 4.697
2 10.79 5.11 4.639
3 11.26 5.59 4.417
4 11.46 5.75 4.349
5 11.98 6.23 4.162
6 12.01 6.28 4.146
7 12.07 6.67 4.010
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 12.07 Tc(MIN.) = 6.67
TOTAL AREA(ACRES) = 3.3
**************************************************************************** FLOW PROCESS FROM NODE 57.00 TO NODE 57.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 2 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 57.00 TO NODE 57.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 3 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 57.00 TO NODE 58.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 77.27 MANNING'S N = 0.010
DEPTH OF FLOW IN 18.0 INCH PIPE IS 13.4 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 8.53
GIVEN PIPE DIAMETER(INCH) = 18.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 12.07
PIPE TRAVEL TIME(MIN.) = 0.15 Tc(MIN.) = 6.82
LONGEST FLOWPATH FROM NODE 44.00 TO NODE 58.00 = 611.14 FEET. **************************************************************************** FLOW PROCESS FROM NODE 58.00 TO NODE 58.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 1 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 10.70 5.15 4.619 3.29
2 10.79 5.27 4.564 3.29
3 11.26 5.74 4.352 3.29
4 11.46 5.90 4.287 3.29
5 11.98 6.38 4.108 3.29
6 12.01 6.43 4.092 3.29
7 12.07 6.82 3.961 3.29
LONGEST FLOWPATH FROM NODE 44.00 TO NODE 58.00 = 611.14 FEET. ** MEMORY BANK # 1 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 17.41 6.97 3.912 16.59
2 18.00 7.14 3.863 16.59
3 18.54 7.32 3.809 16.59
4 18.67 7.37 3.795 16.59
5 18.70 7.41 3.783 16.59
6 18.94 7.51 3.756 16.59
7 19.24 7.74 3.695 16.59
8 20.42 8.80 3.443 16.59
9 20.59 8.95 3.412 16.59
10 24.80 16.02 2.478 16.59
11 29.63 21.64 2.101 16.59
LONGEST FLOWPATH FROM NODE 27.20 TO NODE 58.00 = 2735.53 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 23.75 5.15 4.619
2 24.13 5.27 4.564
3 25.81 5.74 4.352
4 26.41 5.90 4.287
5 28.14 6.38 4.108
6 28.29 6.43 4.092
7 29.34 6.82 3.961
8 29.33 6.97 3.912
9 29.77 7.14 3.863
10 30.15 7.32 3.809
11 30.24 7.37 3.795
12 30.23 7.41 3.783
13 30.39 7.51 3.756
14 30.51 7.74 3.695
15 30.91 8.80 3.443
16 30.99 8.95 3.412
17 32.35 16.02 2.478
18 36.04 21.64 2.101
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 36.04 Tc(MIN.) = 21.64
TOTAL AREA(ACRES) = 19.9
**************************************************************************** FLOW PROCESS FROM NODE 58.00 TO NODE 58.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 1 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 58.00 TO NODE 59.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0040
FLOW LENGTH(FEET) = 109.46 MANNING'S N = 0.013
DEPTH OF FLOW IN 36.0 INCH PIPE IS 26.1 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 6.56
GIVEN PIPE DIAMETER(INCH) = 36.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 36.04
PIPE TRAVEL TIME(MIN.) = 0.28 Tc(MIN.) = 21.92
LONGEST FLOWPATH FROM NODE 27.20 TO NODE 59.00 = 2844.99 FEET. ============================================================================ END OF STUDY SUMMARY:

TOTAL AREA(ACRES) = 19.9 TC(MIN.) = 21.92 PEAK FLOW RATE(CFS) = 36.04
*** PEAK FLOW RATE TABLE ***
Q(CFS) Tc(MIN.)
1 23.75 5.46
2 24.13 5.57
3 25.81 6.04
4 26.41 6.20
5 28.14 6.67
6 28.29 6.72
7 29.34 7.11
8 29.33 7.26
9 29.77 7.43
10 30.15 7.61
11 30.24 7.66
12 30.23 7.70
13 30.39 7.80
14 30.51 8.03
15 30.91 9.09
16 30.99 9.24
17 32.35 16.31
18 36.04 21.92
============================================================================ ============================================================================

END OF RATIONAL METHOD ANALYSIS

____________________________________________________________________________ ****************************************************************************

RATIONAL METHOD HYDROLOGY COMPUTER PROGRAM BASED ON

KHR Associates
17530 Von Karman Avenue
Irvine, CA 92626

************************** DESCRIPTION OF STUDY ************************** * IRON LOFTS * * POST-DEVELOPMENT HYDROLOGY - 6TH STREET RUNOFF NORTHERN HALF * * 10-YEAR STORM EVENT * ************************************************************************** FILE NAME: 6TH-STU.DAT
TIME/DATE OF STUDY: 15:24 07/26/2024
---------------------------------------------------------------------------- USER SPECIFIED HYDROLOGY AND HYDRAULIC MODEL INFORMATION:
---------------------------------------------------------------------------- USER SPECIFIED STORM EVENT(YEAR) = 10.00
SPECIFIED MINIMUM PIPE SIZE(INCH) = 4.00
SPECIFIED PERCENT OF GRADIENTS(DECIMAL) TO USE FOR FRICTION SLOPE = 0.95 10-YEAR STORM 10-MINUTE INTENSITY(INCH/HOUR) = 2.140
10-YEAR STORM 60-MINUTE INTENSITY(INCH/HOUR) = 0.800
100-YEAR STORM 10-MINUTE INTENSITY(INCH/HOUR) = 3.210
100-YEAR STORM 60-MINUTE INTENSITY(INCH/HOUR) = 1.200
SLOPE OF 10-YEAR INTENSITY-DURATION CURVE = 0.5491525
SLOPE OF 100-YEAR INTENSITY-DURATION CURVE = 0.5491524 COMPUTED RAINFALL INTENSITY DATA:

FOR ALL DOWNSTREAM ANALYSES
*USER-DEFINED STREET-SECTIONS FOR COUPLED PIPEFLOW AND STREETFLOW MODEL* HALF- CROWN TO STREET-CROSSFALL: CURB GUTTER-GEOMETRIES: MANNING

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.*
**************************************************************************** FLOW PROCESS FROM NODE 26.10 TO NODE 26.20 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM
DEVELOPMENT IS SINGLE FAMILY (1/4 ACRE)
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 635.00
UPSTREAM ELEVATION(FEET) = 888.00
DOWNSTREAM ELEVATION(FEET) = 881.40
ELEVATION DIFFERENCE(FEET) = 6.60
TC = 0.393*[( 635.00**3)/( 6.60)]**.2 = 12.933
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 1.877
SINGLE-FAMILY(1/4 ACRE LOT) RUNOFF COEFFICIENT = .7911
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 3.09
TOTAL AREA(ACRES) = 2.08 TOTAL RUNOFF(CFS) = 3.09 +--------------------------------------------------------------------------+ | SUBAREA O-2 TO PROPOSED CITY CATCH BASIN | | | | | +--------------------------------------------------------------------------+ **************************************************************************** FLOW PROCESS FROM NODE 26.20 TO NODE 26.30 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 31.08 MANNING'S N = 0.013
DEPTH OF FLOW IN 18.0 INCH PIPE IS 6.8 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 5.07
GIVEN PIPE DIAMETER(INCH) = 18.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 3.09
PIPE TRAVEL TIME(MIN.) = 0.10 Tc(MIN.) = 13.04
LONGEST FLOWPATH FROM NODE 26.10 TO NODE 26.30 = 666.08 FEET. ============================================================================ END OF STUDY SUMMARY:

TOTAL AREA(ACRES) = 2.1 TC(MIN.) = 13.04 PEAK FLOW RATE(CFS) = 3.09
============================================================================ ============================================================================

END OF RATIONAL METHOD ANALYSIS

____________________________________________________________________________ ****************************************************************************

RATIONAL METHOD HYDROLOGY COMPUTER PROGRAM BASED ON

KHR Associates
17530 Von Karman Avenue
Irvine, CA 92626

************************** DESCRIPTION OF STUDY ************************** * IRON LOFTS * * POST-DEVELOPMENT HYDROLOGY - 6TH STREET RUNOFF NORTHERN HALF * * 100-YEAR STORM EVENT * ************************************************************************** FILE NAME: 6TH-STU.DAT
TIME/DATE OF STUDY: 15:23 07/26/2024
---------------------------------------------------------------------------- USER SPECIFIED HYDROLOGY AND HYDRAULIC MODEL INFORMATION:
---------------------------------------------------------------------------- USER SPECIFIED STORM EVENT(YEAR) = 100.00
SPECIFIED MINIMUM PIPE SIZE(INCH) = 4.00
SPECIFIED PERCENT OF GRADIENTS(DECIMAL) TO USE FOR FRICTION SLOPE = 0.95 10-YEAR STORM 10-MINUTE INTENSITY(INCH/HOUR) = 2.140
10-YEAR STORM 60-MINUTE INTENSITY(INCH/HOUR) = 0.800
100-YEAR STORM 10-MINUTE INTENSITY(INCH/HOUR) = 3.210
100-YEAR STORM 60-MINUTE INTENSITY(INCH/HOUR) = 1.200
SLOPE OF 10-YEAR INTENSITY-DURATION CURVE = 0.5491525
SLOPE OF 100-YEAR INTENSITY-DURATION CURVE = 0.5491524 COMPUTED RAINFALL INTENSITY DATA:

FOR ALL DOWNSTREAM ANALYSES
*USER-DEFINED STREET-SECTIONS FOR COUPLED PIPEFLOW AND STREETFLOW MODEL* HALF- CROWN TO STREET-CROSSFALL: CURB GUTTER-GEOMETRIES: MANNING

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.*
**************************************************************************** FLOW PROCESS FROM NODE 26.10 TO NODE 26.20 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM
DEVELOPMENT IS SINGLE FAMILY (1/4 ACRE)
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 635.00
UPSTREAM ELEVATION(FEET) = 888.00
DOWNSTREAM ELEVATION(FEET) = 881.40
ELEVATION DIFFERENCE(FEET) = 6.60
TC = 0.393*[( 635.00**3)/( 6.60)]**.2 = 12.933
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.787
SINGLE-FAMILY(1/4 ACRE LOT) RUNOFF COEFFICIENT = .8204
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 4.76
TOTAL AREA(ACRES) = 2.08 TOTAL RUNOFF(CFS) = 4.76 +--------------------------------------------------------------------------+ | SUBAREA O-2 TO PROPOSED CITY CATCH BASIN | | | | | +--------------------------------------------------------------------------+ **************************************************************************** FLOW PROCESS FROM NODE 26.20 TO NODE 26.30 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 31.08 MANNING'S N = 0.013
DEPTH OF FLOW IN 18.0 INCH PIPE IS 8.6 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 5.68
GIVEN PIPE DIAMETER(INCH) = 18.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 4.76
PIPE TRAVEL TIME(MIN.) = 0.09 Tc(MIN.) = 13.02
LONGEST FLOWPATH FROM NODE 26.10 TO NODE 26.30 = 666.08 FEET. ============================================================================ END OF STUDY SUMMARY:

TOTAL AREA(ACRES) = 2.1 TC(MIN.) = 13.02 PEAK FLOW RATE(CFS) = 4.76
============================================================================ ============================================================================

END OF RATIONAL METHOD ANALYSIS

FILE: RRIL-WSPGW-LINE-A.WSW W S P G W - CIVILDESIGN Version 14.11 PAGE 1 Program Package Serial Number: 7379
WATER SURFACE PROFILE LISTING Date: 9-26-2024 Time: 5:41:28 Iron Lofts
Hydraulic Grade Line
Line A - 100-Year Storm Event
************************************************************************************************************************** ******** | Invert | Depth | Water | Q | Vel Vel | Energy | Super |Critical|Flow Top|Height/|Base Wt| |No Wth Station | Elev | (FT) | Elev | (CFS) | (FPS) Head | Grd.El.| Elev | Depth | Width |Dia.-FT|or I.D.| ZL |Prs/Pip -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -| L/Elem |Ch Slope | | | | SF Ave| HF |SE Dpth|Froude N|Norm Dp | "N" | X-Fall| ZR |Type Ch *********|*********|********|*********|*********|*******|*******|*********|*******|********|********|*******|*******|***** |******* | | | | | | | | | | | | | 103.000 865.040 2.212 867.252 46.11 8.25 1.06 868.31 .00 2.21 2.64 3.000 .000 .00 1 .0 -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- |-

5.332 .0040 .0057 .03 2.21 1.00 3.00 .013 .00 .00 PIPE | | | | | | | | | | | | | 108.332 865.061 2.317 867.378 46.11 7.87 .96 868.34 .00 2.21 2.52 3.000 .000 .00 1 .0 -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- |-

27.375 .0040 .0051 .14 2.32 .91 3.00 .013 .00 .00 PIPE | | | | | | | | | | | | | 135.707 865.171 2.435 867.606 46.11 7.50 .87 868.48 .00 2.21 2.35 3.000 .000 .00 1 .0 -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- |-

76.753 .0040 .0047 .36 2.44 .82 3.00 .013 .00 .00 PIPE | | | | | | | | | | | | | 212.460 865.478 2.562 868.040 46.11 7.17 .80 868.84 .00 2.21 2.12 3.000 .000 .00 1 .0 -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- |- JUNCT STR .0533 .0035 .01 2.56 .73 .013 .00 .00 PIPE | | | | | | | | | | | | | 216.210 865.678 3.143 868.821 34.04 4.82 .36 869.18 .00 1.90 .00 3.000 .000 .00 1 .0 -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- |-

69.250 .0040 .0026 .18 3.14 .00 2.04 .013 .00 .00 PIPE | | | | | | | | | | | | | 285.460 865.955 3.100 869.055 34.04 4.82 .36 869.42 .00 1.90 .00 3.000 .000 .00 1 .0 -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- |- JUNCT STR .0255 .0063 .03 3.10 .00 .013 .00 .00 PIPE | | | | | | | | | | | | | 289.460 866.057 3.022 869.079 22.71 7.23 .81 869.89 .00 1.70 .00 2.000 .000 .00 1 .0 -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- |- 106.500 .0169 .0101 1.07 3.02 .00 1.32 .013 .00 .00 PIPE | | | | | | | | | | | | | 395.960 867.855 2.378 870.233 22.71 7.23 .81 871.04 .00 1.70 .00 2.000 .000 .00 1 .0 -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- |- JUNCT STR .0536 .0101 .04 2.38 .00 .013 .00 .00 PIPE | | | | | | | | | | | | | 399.710 868.056 2.215 870.271 22.71 7.23 .81 871.08 .00 1.70 .00 2.000 .000 .00 1 .0 -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- |-

59.444 .0150 .0101 .60 2.22 .00 1.38 .013 .00 .00 PIPE FILE: RRIL-WSPGW-LINE-A.WSW W S P G W - CIVILDESIGN Version 14.11 PAGE 2 Program Package Serial Number: 7379
WATER SURFACE PROFILE LISTING Date: 9-26-2024 Time: 5:41:28 Iron Lofts
Hydraulic Grade Line
Line A - 100-Year Storm Event
************************************************************************************************************************** ******** | Invert | Depth | Water | Q | Vel Vel | Energy | Super |Critical|Flow Top|Height/|Base Wt| |No Wth Station | Elev | (FT) | Elev | (CFS) | (FPS) Head | Grd.El.| Elev | Depth | Width |Dia.-FT|or I.D.| ZL |Prs/Pip -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -| L/Elem |Ch Slope | | | | SF Ave| HF |SE Dpth|Froude N|Norm Dp | "N" | X-Fall| ZR |Type Ch *********|*********|********|*********|*********|*******|*******|*********|*******|********|********|*******|*******|***** |******* | | | | | | | | | | | | | 459.154 868.950 2.032 870.982 22.71 7.23 .81 871.79 .00 1.70 .00 2.000 .000 .00 1 .0 -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- |-

HYDRAULIC JUMP
| | | | | | | | | | | | | 459.154 868.950 1.377 870.326 22.71 9.85 1.51 871.83 .00 1.70 1.85 2.000 .000 .00 1 .0 -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- |-

64.342 .0150 .0150 .97 1.38 1.56 1.38 .013 .00 .00 PIPE | | | | | | | | | | | | | 523.497 869.917 1.377 871.293 22.71 9.85 1.51 872.80 .00 1.70 1.85 2.000 .000 .00 1 .0 -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- |-

97.563 .0150 .0152 1.48 1.38 1.56 1.38 .013 .00 .00 PIPE | | | | | | | | | | | | | 621.060 871.383 1.364 872.747 22.71 9.95 1.54 874.28 .00 1.70 1.86 2.000 .000 .00 1 .0 -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- |- JUNCT STR .0736 .0135 .04 1.36 1.58 .013 .00 .00 PIPE | | | | | | | | | | | | | 623.790 871.584 1.528 873.112 22.71 8.82 1.21 874.32 .00 1.70 1.70 2.000 .000 .00 1 .0 -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- |-

6.804 .0120 .0116 .08 1.53 1.26 1.51 .013 .00 .00 PIPE | | | | | | | | | | | | | 630.594 871.666 1.532 873.198 22.71 8.79 1.20 874.40 .00 1.70 1.69 2.000 .000 .00 1 .0 -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- |-

33.037 .0120 .0110 .36 1.53 1.25 1.51 .013 .00 .00 PIPE | | | | | | | | | | | | | 663.631 872.062 1.608 873.670 22.71 8.38 1.09 874.76 .00 1.70 1.59 2.000 .000 .00 1 .0 -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- |-

5.519 .0120 .0100 .06 1.61 1.13 1.51 .013 .00 .00 PIPE | | | | | | | | | | | | | 669.150 872.128 1.697 873.825 22.71 7.99 .99 874.82 .00 1.70 1.43 2.000 .000 .00 1 .0 -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- |- | | | | | | | | | | | | | 675.300 872.590 1.697 874.287 22.71 7.99 .99 875.28 .00 1.70 1.43 2.000 .000 .00 1 .0 -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- |-

FILE: RRIL-WSPGW-LINE-A-2.WSW W S P G W - CIVILDESIGN Version 14.11 PAGE 1 Program Package Serial Number: 7379
WATER SURFACE PROFILE LISTING Date: 8- 8-2024 Time: 3:47: 6 Iron Lofts
Hydraulic Grade Line
Line A - 100-Year Storm Event
************************************************************************************************************************** ******** | Invert | Depth | Water | Q | Vel Vel | Energy | Super |Critical|Flow Top|Height/|Base Wt| |No Wth Station | Elev | (FT) | Elev | (CFS) | (FPS) Head | Grd.El.| Elev | Depth | Width |Dia.-FT|or I.D.| ZL |Prs/Pip -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -| L/Elem |Ch Slope | | | | SF Ave| HF |SE Dpth|Froude N|Norm Dp | "N" | X-Fall| ZR |Type Ch *********|*********|********|*********|*********|*******|*******|*********|*******|********|********|*******|*******|***** |******* | | | | | | | | | | | | | 675.300 872.590 .716 873.306 4.76 5.72 .51 873.81 .00 .84 1.50 1.500 .000 .00 1 .0 -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- |-

5.730 .0100 .0095 .05 .72 1.35 .71 .013 .00 .00 PIPE | | | | | | | | | | | | | 681.031 872.647 .719 873.366 4.76 5.68 .50 873.87 .00 .84 1.50 1.500 .000 .00 1 .0 -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- |-

16.128 .0100 .0089 .14 .72 1.34 .71 .013 .00 .00 PIPE | | | | | | | | | | | | | 697.158 872.808 .747 873.555 4.76 5.41 .46 874.01 .00 .84 1.50 1.500 .000 .00 1 .0 -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- |-

6.234 .0100 .0078 .05 .75 1.25 .71 .013 .00 .00 PIPE | | | | | | | | | | | | | 703.392 872.870 .775 873.645 4.76 5.16 .41 874.06 .00 .84 1.50 1.500 .000 .00 1 .0 -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- |-

2.476 .0100 .0069 .02 .78 1.16 .71 .013 .00 .00 PIPE | | | | | | | | | | | | | 705.868 872.895 .805 873.700 4.76 4.92 .38 874.08 .00 .84 1.50 1.500 .000 .00 1 .0 -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- |- .512 .0100 .0061 .00 .81 1.08 .71 .013 .00 .00 PIPE | | | | | | | | | | | | | 706.380 872.900 .838 873.738 4.76 4.69 .34 874.08 .00 .84 1.49 1.500 .000 .00 1 .0 -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- |- | | | | | | | | | | | | | 711.700 873.350 .838 874.188 4.76 4.69 .34 874.53 .00 .84 1.49 1.500 .000 .00 1 .0 -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- -|- |-

Pipe Capacity: 36" SD @0.004 - Discharging Outlet
Project Description
Manning
FormulaFriction Method
Normal DepthSolve For
Input Data

0.013Roughness Coefficient
ft/ft0.004Channel Slope
in36.0Diameter
cfs36.04Discharge
Results
in25.6Normal Depth
ft²5.4Flow Area
ft6.0Wetted Perimeter
in10.7Hydraulic Radius
ft2.72Top Width
in23.4Critical Depth
%71.1Percent Full
ft/ft0.005Critical Slope
ft/s6.70Velocity
ft0.70Velocity Head
ft2.83Specific Energy

0.841Froude Number
cfs45.37Maximum Discharge
cfs42.18Discharge Full
ft/ft0.003Slope Full
SubcriticalFlow Type
GVF Input Data
in0.0Downstream Depth
ft0.0Length
0Number Of Steps
GVF Output Data
in0.0Upstream Depth
N/AProfile Description
ft0.00Profile Headloss
%0.0Average End Depth Over Rise
%57.6Normal Depth Over Rise
ft/sInfinityDownstream Velocity
ft/sInfinityUpstream Velocity
in25.6Normal Depth
in23.4Critical Depth
ft/ft0.004Channel Slope
ft/ft0.005Critical Slope

Page 1 of 127 ends

Watertown, CT 06795 USA +1-203-755-1666
8/5/2024
FlowMaster
[10.03.00.03]
Bentley Systems, Inc. Haestad Methods Solution
CenterOn-Site Pipe Sizing-100.fm8
Pipe Capacity: 36" SD @0.004 - Off-site plus On-site Overflow Project Description
Manning
FormulaFriction Method
Normal DepthSolve For
Input Data

0.013Roughness Coefficient
ft/ft0.004Channel Slope
in36.0Diameter
cfs29.63Discharge
Results
in22.2Normal Depth
ft²4.6Flow Area
ft5.4Wetted Perimeter
in10.1Hydraulic Radius
ft2.92Top Width
in21.2Critical Depth
%61.8Percent Full
ft/ft0.005Critical Slope
ft/s6.46Velocity
ft0.65Velocity Head
ft2.50Specific Energy

0.908Froude Number
cfs45.37Maximum Discharge
cfs42.18Discharge Full
ft/ft0.002Slope Full
SubcriticalFlow Type
GVF Input Data
in0.0Downstream Depth
ft0.0Length
0Number Of Steps
GVF Output Data
in0.0Upstream Depth
N/AProfile Description
ft0.00Profile Headloss
%0.0Average End Depth Over Rise
%64.2Normal Depth Over Rise
ft/sInfinityDownstream Velocity
ft/sInfinityUpstream Velocity
in22.2Normal Depth
in21.2Critical Depth
ft/ft0.004Channel Slope
ft/ft0.005Critical Slope

Page 1 of 127 ends

Watertown, CT 06795 USA +1-203-755-1666
8/5/2024
FlowMaster
[10.03.00.03]
Bentley Systems, Inc. Haestad Methods Solution
CenterOn-Site Pipe Sizing-100.fm8
Pipe Capacity: 24"SD @0.0169
Project Description
Manning
FormulaFriction Method
Normal DepthSolve For
Input Data

0.013Roughness Coefficient
ft/ft0.017Channel Slope
in24.0Diameter
cfs22.71Discharge
Results
in15.8Normal Depth
ft²2.2Flow Area
ft3.8Wetted Perimeter
in7.0Hydraulic Radius
ft1.90Top Width
in20.4Critical Depth
%66.0Percent Full
ft/ft0.010Critical Slope
ft/s10.33Velocity
ft1.66Velocity Head
ft2.98Specific Energy

1.691Froude Number
cfs31.63Maximum Discharge
cfs29.41Discharge Full
ft/ft0.010Slope Full
SupercriticalFlow Type
GVF Input Data
in0.0Downstream Depth
ft0.0Length
0Number Of Steps
GVF Output Data
in0.0Upstream Depth
N/AProfile Description
ft0.00Profile Headloss
%0.0Average End Depth Over Rise
%66.0Normal Depth Over Rise
ft/sInfinityDownstream Velocity
ft/sInfinityUpstream Velocity
in15.8Normal Depth
in20.4Critical Depth
ft/ft0.017Channel Slope
ft/ft0.010Critical Slope

Page 1 of 127 ends

Watertown, CT 06795 USA +1-203-755-1666
9/26/2024
FlowMaster
[10.03.00.03]
Bentley Systems, Inc. Haestad Methods Solution
CenterOn-Site Pipe Sizing-100.fm8
Pipe Capacity: 24" SD @0.0150
Project Description
Manning
FormulaFriction Method
Normal DepthSolve For
Input Data

0.013Roughness Coefficient
ft/ft0.015Channel Slope
in24.0Diameter
cfs22.71Discharge
Results
in16.5Normal Depth
ft²2.3Flow Area
ft3.9Wetted Perimeter
in7.1Hydraulic Radius
ft1.85Top Width
in20.4Critical Depth
%68.9Percent Full
ft/ft0.010Critical Slope
ft/s9.84Velocity
ft1.50Velocity Head
ft2.88Specific Energy

1.554Froude Number
cfs29.80Maximum Discharge
cfs27.71Discharge Full
ft/ft0.010Slope Full
SupercriticalFlow Type
GVF Input Data
in0.0Downstream Depth
ft0.0Length
0Number Of Steps
GVF Output Data
in0.0Upstream Depth
N/AProfile Description
ft0.00Profile Headloss
%0.0Average End Depth Over Rise
%68.9Normal Depth Over Rise
ft/sInfinityDownstream Velocity
ft/sInfinityUpstream Velocity
in16.5Normal Depth
in20.4Critical Depth
ft/ft0.015Channel Slope
ft/ft0.010Critical Slope

Page 1 of 127 ends

Watertown, CT 06795 USA +1-203-755-1666
8/5/2024
FlowMaster
[10.03.00.03]
Bentley Systems, Inc. Haestad Methods Solution
CenterOn-Site Pipe Sizing-100.fm8
Pipe Capacity: 24" SD @0.0120
Project Description
Manning
FormulaFriction Method
Normal DepthSolve For
Input Data

0.013Roughness Coefficient
ft/ft0.012Channel Slope
in24.0Diameter
cfs22.71Discharge
Results
in18.1Normal Depth
ft²2.5Flow Area
ft4.2Wetted Perimeter
in7.2Hydraulic Radius
ft1.72Top Width
in20.4Critical Depth
%75.3Percent Full
ft/ft0.010Critical Slope
ft/s8.95Velocity
ft1.24Velocity Head
ft2.75Specific Energy

1.300Froude Number
cfs26.66Maximum Discharge
cfs24.78Discharge Full
ft/ft0.010Slope Full
SupercriticalFlow Type
GVF Input Data
in0.0Downstream Depth
ft0.0Length
0Number Of Steps
GVF Output Data
in0.0Upstream Depth
N/AProfile Description
ft0.00Profile Headloss
%0.0Average End Depth Over Rise
%75.3Normal Depth Over Rise
ft/sInfinityDownstream Velocity
ft/sInfinityUpstream Velocity
in18.1Normal Depth
in20.4Critical Depth
ft/ft0.012Channel Slope
ft/ft0.010Critical Slope

Page 1 of 127 ends

Watertown, CT 06795 USA +1-203-755-1666
9/30/2024
FlowMaster
[10.03.00.03]
Bentley Systems, Inc. Haestad Methods Solution
CenterOn-Site Pipe Sizing-100.fm8
Pipe Capacity: 18" SD @0.010
Project Description
Manning
FormulaFriction Method
Normal DepthSolve For
Input Data

0.013Roughness Coefficient
ft/ft0.010Channel Slope
in18.0Diameter
cfs4.76Discharge
Results
in8.5Normal Depth
ft²0.8Flow Area
ft2.3Wetted Perimeter
in4.3Hydraulic Radius
ft1.50Top Width
in10.1Critical Depth
%47.2Percent Full
ft/ft0.006Critical Slope
ft/s5.80Velocity
ft0.52Velocity Head
ft1.23Specific Energy

1.381Froude Number
cfs11.30Maximum Discharge
cfs10.50Discharge Full
ft/ft0.002Slope Full
SupercriticalFlow Type
GVF Input Data
in0.0Downstream Depth
ft0.0Length
0Number Of Steps
GVF Output Data
in0.0Upstream Depth
N/AProfile Description
ft0.00Profile Headloss
%0.0Average End Depth Over Rise
%47.2Normal Depth Over Rise
ft/sInfinityDownstream Velocity
ft/sInfinityUpstream Velocity
in8.5Normal Depth
in10.1Critical Depth
ft/ft0.010Channel Slope
ft/ft0.006Critical Slope

Page 1 of 127 ends

Watertown, CT 06795 USA +1-203-755-1666
8/1/2024
FlowMaster
[10.03.00.03]
Bentley Systems, Inc. Haestad Methods Solution
CenterOn-Site Pipe Sizing-100.fm8
Hydrology Report Prepared by
Riverside, California KHR Associates

Appendix 2.1.1
Post-Development Hydrology Calculations:

On-Site Only

____________________________________________________________________________ ****************************************************************************

RATIONAL METHOD HYDROLOGY COMPUTER PROGRAM BASED ON

KHR Associates
17530 Von Karman Avenue
Irvine, CA 92626

************************** DESCRIPTION OF STUDY ************************** * IRON LOFTS * * POST-DEVELOPMENT HYDROLOGY - ON-SITE ONLY * * 10-YEAR STORM EVENT * ************************************************************************** FILE NAME: RIL1-S10.DAT
TIME/DATE OF STUDY: 12:44 08/02/2024
---------------------------------------------------------------------------- USER SPECIFIED HYDROLOGY AND HYDRAULIC MODEL INFORMATION:
---------------------------------------------------------------------------- USER SPECIFIED STORM EVENT(YEAR) = 10.00
SPECIFIED MINIMUM PIPE SIZE(INCH) = 4.00
SPECIFIED PERCENT OF GRADIENTS(DECIMAL) TO USE FOR FRICTION SLOPE = 0.95 10-YEAR STORM 10-MINUTE INTENSITY(INCH/HOUR) = 2.140
10-YEAR STORM 60-MINUTE INTENSITY(INCH/HOUR) = 0.800
100-YEAR STORM 10-MINUTE INTENSITY(INCH/HOUR) = 3.210
100-YEAR STORM 60-MINUTE INTENSITY(INCH/HOUR) = 1.200
SLOPE OF 10-YEAR INTENSITY-DURATION CURVE = 0.5491525
SLOPE OF 100-YEAR INTENSITY-DURATION CURVE = 0.5491524 COMPUTED RAINFALL INTENSITY DATA:

FOR ALL DOWNSTREAM ANALYSES
*USER-DEFINED STREET-SECTIONS FOR COUPLED PIPEFLOW AND STREETFLOW MODEL* HALF- CROWN TO STREET-CROSSFALL: CURB GUTTER-GEOMETRIES: MANNING

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

ASSUMED INITIAL SUBAREA UNIFORM

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 9.13
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 4.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.80
PIPE TRAVEL TIME(MIN.) = 0.03 Tc(MIN.) = 5.03
LONGEST FLOWPATH FROM NODE 16.00 TO NODE 17.10 = 89.43 FEET. **************************************************************************** FLOW PROCESS FROM NODE 17.10 TO NODE 18.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 164.51 MANNING'S N = 0.009
DEPTH OF FLOW IN 8.0 INCH PIPE IS 3.8 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 4.81
GIVEN PIPE DIAMETER(INCH) = 8.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.80
PIPE TRAVEL TIME(MIN.) = 0.57 Tc(MIN.) = 5.60
LONGEST FLOWPATH FROM NODE 16.00 TO NODE 18.00 = 253.94 FEET. **************************************************************************** FLOW PROCESS FROM NODE 18.00 TO NODE 18.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 2 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 18.00 TO NODE 18.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 19.00 TO NODE 20.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 38.52
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 6.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 7.56
PIPE TRAVEL TIME(MIN.) = 0.02 Tc(MIN.) = 7.36
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 25.00 = 517.62 FEET. **************************************************************************** FLOW PROCESS FROM NODE 26.00 TO NODE 27.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0040
FLOW LENGTH(FEET) = 255.17 MANNING'S N = 0.010
DEPTH OF FLOW IN 18.0 INCH PIPE IS 13.3 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 5.39
GIVEN PIPE DIAMETER(INCH) = 18.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 7.56
PIPE TRAVEL TIME(MIN.) = 0.79 Tc(MIN.) = 8.15
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 27.00 = 772.79 FEET. **************************************************************************** FLOW PROCESS FROM NODE 27.00 TO NODE 27.10 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0040
FLOW LENGTH(FEET) = 279.97 MANNING'S N = 0.010
DEPTH OF FLOW IN 18.0 INCH PIPE IS 13.3 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 5.39
GIVEN PIPE DIAMETER(INCH) = 18.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 7.56
PIPE TRAVEL TIME(MIN.) = 0.87 Tc(MIN.) = 9.02
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 27.10 = 1052.76 FEET. **************************************************************************** FLOW PROCESS FROM NODE 27.10 TO NODE 27.10 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 1 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 27.10 TO NODE 27.10 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 27.10 TO NODE 28.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0040
FLOW LENGTH(FEET) = 71.25 MANNING'S N = 0.013
DEPTH OF FLOW IN 36.0 INCH PIPE IS 3.9 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 2.45
GIVEN PIPE DIAMETER(INCH) = 36.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 1.00
PIPE TRAVEL TIME(MIN.) = 0.49 Tc(MIN.) = 5.49
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 28.00 = 1124.01 FEET. **************************************************************************** FLOW PROCESS FROM NODE 28.00 TO NODE 28.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 1 <<<<< ============================================================================ ***MEMORY BANK # 1 IS FULL. THEREFORE, MAIN-STREAM MEMORY DATA CAN NOT BE COPIED ONTO IT - PROCESS IGNORED.***
**************************************************************************** FLOW PROCESS FROM NODE 28.00 TO NODE 28.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 29.00 TO NODE 30.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

PEAK FLOW RATE(CFS) = 8.05 Tc(MIN.) = 6.77
TOTAL AREA(ACRES) = 3.3
**************************************************************************** FLOW PROCESS FROM NODE 57.00 TO NODE 57.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 2 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 57.00 TO NODE 57.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 3 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 57.00 TO NODE 58.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 77.27 MANNING'S N = 0.010
DEPTH OF FLOW IN 18.0 INCH PIPE IS 10.1 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 7.89
GIVEN PIPE DIAMETER(INCH) = 18.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 8.05
PIPE TRAVEL TIME(MIN.) = 0.16 Tc(MIN.) = 6.93
LONGEST FLOWPATH FROM NODE 44.00 TO NODE 58.00 = 611.14 FEET. **************************************************************************** FLOW PROCESS FROM NODE 58.00 TO NODE 58.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 1 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 7.00 5.17 3.105 3.29
2 7.06 5.29 3.065 3.29
3 7.42 5.82 2.909 3.29
4 7.56 6.00 2.862 3.29
5 8.01 6.62 2.712 3.29
6 8.01 6.62 2.710 3.29
7 8.05 6.93 2.643 3.29
LONGEST FLOWPATH FROM NODE 44.00 TO NODE 58.00 = 611.14 FEET. ** MEMORY BANK # 1 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 6.73 6.94 2.642 3.38
2 7.12 7.24 2.580 3.38
3 7.31 7.45 2.540 3.38
4 7.33 7.47 2.537 3.38
5 7.42 7.62 2.509 3.38
6 7.47 7.68 2.498 3.38
7 7.53 7.99 2.445 3.38
8 7.56 9.00 2.290 3.38
9 7.56 9.02 2.288 3.38
10 5.31 16.19 1.659 3.38
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 58.00 = 1052.76 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 12.08 5.17 3.105
2 12.27 5.29 3.065
3 13.14 5.82 2.909
4 13.45 6.00 2.862
5 14.52 6.62 2.712
6 14.53 6.62 2.710
7 14.86 6.93 2.643
8 14.77 6.94 2.642
9 14.98 7.24 2.580
10 15.05 7.45 2.540
11 15.05 7.47 2.537
12 15.06 7.62 2.509
13 15.08 7.68 2.498
14 14.97 7.99 2.445
15 14.54 9.00 2.290
16 14.53 9.02 2.288
17 10.36 16.19 1.659
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 15.08 Tc(MIN.) = 7.68
TOTAL AREA(ACRES) = 6.7
**************************************************************************** FLOW PROCESS FROM NODE 58.00 TO NODE 58.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 1 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 58.00 TO NODE 59.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0040
FLOW LENGTH(FEET) = 109.46 MANNING'S N = 0.013
DEPTH OF FLOW IN 36.0 INCH PIPE IS 15.1 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 5.37
GIVEN PIPE DIAMETER(INCH) = 36.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 15.08
PIPE TRAVEL TIME(MIN.) = 0.34 Tc(MIN.) = 8.02
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 59.00 = 1162.22 FEET. ============================================================================ END OF STUDY SUMMARY:

TOTAL AREA(ACRES) = 6.7 TC(MIN.) = 8.02 PEAK FLOW RATE(CFS) = 15.08
*** PEAK FLOW RATE TABLE ***
Q(CFS) Tc(MIN.)
1 12.08 5.53
2 12.27 5.65
3 13.14 6.17
4 13.45 6.35
5 14.52 6.96
6 14.53 6.97
7 14.86 7.27
8 14.77 7.28
9 14.98 7.58
10 15.05 7.79
11 15.05 7.81
12 15.06 7.96
13 15.08 8.02
14 14.97 8.33
15 14.54 9.34
16 14.53 9.36
17 10.36 16.56
============================================================================ ============================================================================

END OF RATIONAL METHOD ANALYSIS

____________________________________________________________________________ ****************************************************************************

RATIONAL METHOD HYDROLOGY COMPUTER PROGRAM BASED ON

KHR Associates
17530 Von Karman Avenue
Irvine, CA 92626

************************** DESCRIPTION OF STUDY ************************** * IRON LOFTS * * POST-DEVELOPMENT HYDROLOGY - ON-SITE ONLY * * 100-YEAR STORM EVENT * ************************************************************************** FILE NAME: RIL1-S10.DAT
TIME/DATE OF STUDY: 12:44 08/02/2024
---------------------------------------------------------------------------- USER SPECIFIED HYDROLOGY AND HYDRAULIC MODEL INFORMATION:
---------------------------------------------------------------------------- USER SPECIFIED STORM EVENT(YEAR) = 100.00
SPECIFIED MINIMUM PIPE SIZE(INCH) = 4.00
SPECIFIED PERCENT OF GRADIENTS(DECIMAL) TO USE FOR FRICTION SLOPE = 0.95 10-YEAR STORM 10-MINUTE INTENSITY(INCH/HOUR) = 2.140
10-YEAR STORM 60-MINUTE INTENSITY(INCH/HOUR) = 0.800
100-YEAR STORM 10-MINUTE INTENSITY(INCH/HOUR) = 3.210
100-YEAR STORM 60-MINUTE INTENSITY(INCH/HOUR) = 1.200
SLOPE OF 10-YEAR INTENSITY-DURATION CURVE = 0.5491525
SLOPE OF 100-YEAR INTENSITY-DURATION CURVE = 0.5491524 COMPUTED RAINFALL INTENSITY DATA:

FOR ALL DOWNSTREAM ANALYSES
*USER-DEFINED STREET-SECTIONS FOR COUPLED PIPEFLOW AND STREETFLOW MODEL* HALF- CROWN TO STREET-CROSSFALL: CURB GUTTER-GEOMETRIES: MANNING

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

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 124.00
UPSTREAM ELEVATION(FEET) = 879.50
DOWNSTREAM ELEVATION(FEET) = 877.89
ELEVATION DIFFERENCE(FEET) = 1.61
TC = 0.323*[( 124.00**3)/( 1.61)]**.2 = 5.290
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.554
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8791
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 1.48
TOTAL AREA(ACRES) = 0.37 TOTAL RUNOFF(CFS) = 1.48 **************************************************************************** FLOW PROCESS FROM NODE 2.00 TO NODE 2.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 1 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 2.00 TO NODE 2.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 3.00 TO NODE 4.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 94.00
UPSTREAM ELEVATION(FEET) = 15.00
DOWNSTREAM ELEVATION(FEET) = 13.00
ELEVATION DIFFERENCE(FEET) = 2.00
TC = 0.323*[( 94.00**3)/( 2.00)]**.2 = 4.290
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.697
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8796
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 0.83
TOTAL AREA(ACRES) = 0.20 TOTAL RUNOFF(CFS) = 0.83 **************************************************************************** FLOW PROCESS FROM NODE 7.00 TO NODE 5.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 12.57 MANNING'S N = 0.009

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 71.61
UPSTREAM ELEVATION(FEET) = 15.00
DOWNSTREAM ELEVATION(FEET) = 13.00
ELEVATION DIFFERENCE(FEET) = 2.00
TC = 0.323*[( 71.61**3)/( 2.00)]**.2 = 3.644
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.697
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8796
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 0.84
TOTAL AREA(ACRES) = 0.20 TOTAL RUNOFF(CFS) = 0.84 **************************************************************************** FLOW PROCESS FROM NODE 10.00 TO NODE 10.10 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 45.35 MANNING'S N = 0.009

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 36.94
UPSTREAM ELEVATION(FEET) = 15.00
DOWNSTREAM ELEVATION(FEET) = 13.00
ELEVATION DIFFERENCE(FEET) = 2.00
TC = 0.323*[( 36.94**3)/( 2.00)]**.2 = 2.450
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.697
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8796
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 0.21
TOTAL AREA(ACRES) = 0.05 TOTAL RUNOFF(CFS) = 0.21 **************************************************************************** FLOW PROCESS FROM NODE 12.00 TO NODE 13.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 41.32 MANNING'S N = 0.009
DEPTH OF FLOW IN 4.0 INCH PIPE IS 2.7 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 3.34
GIVEN PIPE DIAMETER(INCH) = 4.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.21
PIPE TRAVEL TIME(MIN.) = 0.21 Tc(MIN.) = 5.21
LONGEST FLOWPATH FROM NODE 11.00 TO NODE 13.00 = 78.26 FEET. **************************************************************************** FLOW PROCESS FROM NODE 13.00 TO NODE 13.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 1 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 0.21 5.21 4.594 0.05
LONGEST FLOWPATH FROM NODE 11.00 TO NODE 13.00 = 78.26 FEET. ** MEMORY BANK # 1 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 4.95 5.67 4.385 1.30
2 4.97 5.72 4.361 1.30
3 5.01 5.88 4.296 1.30
4 4.98 6.12 4.205 1.30
5 4.61 7.19 3.848 1.30
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 13.00 = 461.69 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 4.75 5.21 4.594
2 5.15 5.67 4.385
3 5.16 5.72 4.361
4 5.20 5.88 4.296
5 5.17 6.12 4.205
6 4.78 7.19 3.848
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 282.36
UPSTREAM ELEVATION(FEET) = 881.50
DOWNSTREAM ELEVATION(FEET) = 877.80
ELEVATION DIFFERENCE(FEET) = 3.70
TC = 0.323*[( 282.36**3)/( 3.70)]**.2 = 7.339
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.804
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8755
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 4.41
TOTAL AREA(ACRES) = 1.32 TOTAL RUNOFF(CFS) = 4.41 **************************************************************************** FLOW PROCESS FROM NODE 15.00 TO NODE 15.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 1 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 4.41 7.34 3.804 1.32
LONGEST FLOWPATH FROM NODE 14.00 TO NODE 15.00 = 282.36 FEET. ** MEMORY BANK # 1 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 4.75 5.21 4.594 1.35
2 5.15 5.67 4.385 1.35
3 5.16 5.72 4.361 1.35
4 5.20 5.88 4.296 1.35
5 5.17 6.12 4.205 1.35
6 4.78 7.19 3.848 1.35
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 15.00 = 461.69 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 7.88 5.21 4.594
2 8.55 5.67 4.385
3 8.60 5.72 4.361
4 8.73 5.88 4.296
5 8.84 6.12 4.205
6 9.10 7.19 3.848
7 9.13 7.34 3.804
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 74.23
UPSTREAM ELEVATION(FEET) = 15.00
DOWNSTREAM ELEVATION(FEET) = 13.00
ELEVATION DIFFERENCE(FEET) = 2.00
TC = 0.323*[( 74.23**3)/( 2.00)]**.2 = 3.723
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.697
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8796
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 1.19
TOTAL AREA(ACRES) = 0.29 TOTAL RUNOFF(CFS) = 1.19 **************************************************************************** FLOW PROCESS FROM NODE 17.00 TO NODE 17.10 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 15.20 MANNING'S N = 0.009

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 13.68
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 4.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 1.19
PIPE TRAVEL TIME(MIN.) = 0.02 Tc(MIN.) = 5.02
LONGEST FLOWPATH FROM NODE 16.00 TO NODE 17.10 = 89.43 FEET. **************************************************************************** FLOW PROCESS FROM NODE 17.10 TO NODE 18.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 164.51 MANNING'S N = 0.009
DEPTH OF FLOW IN 8.0 INCH PIPE IS 4.9 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 5.27
GIVEN PIPE DIAMETER(INCH) = 8.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 1.19
PIPE TRAVEL TIME(MIN.) = 0.52 Tc(MIN.) = 5.54
LONGEST FLOWPATH FROM NODE 16.00 TO NODE 18.00 = 253.94 FEET. **************************************************************************** FLOW PROCESS FROM NODE 18.00 TO NODE 18.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 2 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 18.00 TO NODE 18.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 19.00 TO NODE 20.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 147.00
UPSTREAM ELEVATION(FEET) = 881.00
DOWNSTREAM ELEVATION(FEET) = 878.08
ELEVATION DIFFERENCE(FEET) = 2.92
TC = 0.323*[( 147.00**3)/( 2.92)]**.2 = 5.201
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.596
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8792
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 1.27
TOTAL AREA(ACRES) = 0.31 TOTAL RUNOFF(CFS) = 1.27 **************************************************************************** FLOW PROCESS FROM NODE 20.00 TO NODE 20.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 2 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 1.27 5.20 4.596 0.31
LONGEST FLOWPATH FROM NODE 19.00 TO NODE 20.00 = 147.00 FEET. ** MEMORY BANK # 2 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 1.19 5.54 4.440 0.29
LONGEST FLOWPATH FROM NODE 16.00 TO NODE 20.00 = 253.94 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 2.39 5.20 4.596
2 2.42 5.54 4.440
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

ASSUMED INITIAL SUBAREA UNIFORM
DEVELOPMENT IS: UNDEVELOPED WITH GOOD COVER
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 77.86
UPSTREAM ELEVATION(FEET) = 881.47
DOWNSTREAM ELEVATION(FEET) = 880.67
ELEVATION DIFFERENCE(FEET) = 0.80
TC = 0.937*[( 77.86**3)/( 0.80)]**.2 = 13.369
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.737
UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .7384
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 0.20
TOTAL AREA(ACRES) = 0.10 TOTAL RUNOFF(CFS) = 0.20 **************************************************************************** FLOW PROCESS FROM NODE 23.00 TO NODE 21.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 107.21 MANNING'S N = 0.009
DEPTH OF FLOW IN 6.0 INCH PIPE IS 2.1 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 3.40
GIVEN PIPE DIAMETER(INCH) = 6.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.20
PIPE TRAVEL TIME(MIN.) = 0.53 Tc(MIN.) = 13.90
LONGEST FLOWPATH FROM NODE 22.00 TO NODE 21.00 = 185.07 FEET. **************************************************************************** FLOW PROCESS FROM NODE 21.00 TO NODE 21.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 2 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 0.20 13.90 2.679 0.10
LONGEST FLOWPATH FROM NODE 22.00 TO NODE 21.00 = 185.07 FEET. ** MEMORY BANK # 2 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 2.39 5.25 4.573 0.60
2 2.42 5.59 4.419 0.60
LONGEST FLOWPATH FROM NODE 16.00 TO NODE 21.00 = 289.86 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 2.47 5.25 4.573
2 2.51 5.59 4.419
3 1.67 13.90 2.679
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

ASSUME FULL-FLOWING PIPELINE
PIPE-FLOW VELOCITY(FEET/SEC.) = 6.41
PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) GIVEN PIPE DIAMETER(INCH) = 18.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 11.33
PIPE TRAVEL TIME(MIN.) = 0.73 Tc(MIN.) = 8.75
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 27.10 = 1052.76 FEET. **************************************************************************** FLOW PROCESS FROM NODE 27.10 TO NODE 27.10 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 1 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 27.10 TO NODE 27.10 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 27.10 TO NODE 28.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0040
FLOW LENGTH(FEET) = 71.25 MANNING'S N = 0.013
DEPTH OF FLOW IN 36.0 INCH PIPE IS 3.9 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 2.45
GIVEN PIPE DIAMETER(INCH) = 36.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 1.00
PIPE TRAVEL TIME(MIN.) = 0.49 Tc(MIN.) = 5.49
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 28.00 = 1124.01 FEET. **************************************************************************** FLOW PROCESS FROM NODE 28.00 TO NODE 28.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 1 <<<<< ============================================================================ ***MEMORY BANK # 1 IS FULL. THEREFORE, MAIN-STREAM MEMORY DATA CAN NOT BE COPIED ONTO IT - PROCESS IGNORED.***
**************************************************************************** FLOW PROCESS FROM NODE 28.00 TO NODE 28.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 29.00 TO NODE 30.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 61.88
UPSTREAM ELEVATION(FEET) = 882.80
DOWNSTREAM ELEVATION(FEET) = 882.10
ELEVATION DIFFERENCE(FEET) = 0.70
TC = 0.323*[( 61.88**3)/( 0.70)]**.2 = 4.118
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.697
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8796
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 0.68
TOTAL AREA(ACRES) = 0.16 TOTAL RUNOFF(CFS) = 0.68 **************************************************************************** FLOW PROCESS FROM NODE 30.00 TO NODE 31.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 55.57 MANNING'S N = 0.009

ASSUMED INITIAL SUBAREA UNIFORM

ASSUMED INITIAL SUBAREA UNIFORM
DEVELOPMENT IS: UNDEVELOPED WITH GOOD COVER
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 47.00
UPSTREAM ELEVATION(FEET) = 879.59
DOWNSTREAM ELEVATION(FEET) = 878.75
ELEVATION DIFFERENCE(FEET) = 0.84
TC = 0.937*[( 47.00**3)/( 0.84)]**.2 = 9.780
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.250
UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .7599
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 0.22
TOTAL AREA(ACRES) = 0.09 TOTAL RUNOFF(CFS) = 0.22 **************************************************************************** FLOW PROCESS FROM NODE 38.00 TO NODE 36.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 14.50 MANNING'S N = 0.009
DEPTH OF FLOW IN 10.0 INCH PIPE IS 1.8 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 3.25
GIVEN PIPE DIAMETER(INCH) = 10.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.22
PIPE TRAVEL TIME(MIN.) = 0.07 Tc(MIN.) = 9.85
LONGEST FLOWPATH FROM NODE 37.00 TO NODE 36.00 = 61.50 FEET. **************************************************************************** FLOW PROCESS FROM NODE 36.00 TO NODE 36.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 3 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 0.22 9.85 3.236 0.09
LONGEST FLOWPATH FROM NODE 37.00 TO NODE 36.00 = 61.50 FEET. ** MEMORY BANK # 3 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 1.00 5.17 4.613 0.26
2 1.04 5.69 4.374 0.26
LONGEST FLOWPATH FROM NODE 29.00 TO NODE 36.00 = 278.61 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 1.11 5.17 4.613
2 1.17 5.69 4.374
3 0.99 9.85 3.236
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 74.92
UPSTREAM ELEVATION(FEET) = 15.00
DOWNSTREAM ELEVATION(FEET) = 13.00
ELEVATION DIFFERENCE(FEET) = 2.00
TC = 0.323*[( 74.92**3)/( 2.00)]**.2 = 3.744
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.697
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8796
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 1.67
TOTAL AREA(ACRES) = 0.40 TOTAL RUNOFF(CFS) = 1.67 **************************************************************************** FLOW PROCESS FROM NODE 41.00 TO NODE 39.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 7.00 MANNING'S N = 0.009

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 47.00
UPSTREAM ELEVATION(FEET) = 15.00
DOWNSTREAM ELEVATION(FEET) = 13.00
ELEVATION DIFFERENCE(FEET) = 2.00
TC = 0.323*[( 47.00**3)/( 2.00)]**.2 = 2.830
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.697
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8796
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 1.46
TOTAL AREA(ACRES) = 0.35 TOTAL RUNOFF(CFS) = 1.46 **************************************************************************** FLOW PROCESS FROM NODE 45.00 TO NODE 46.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 32.65 MANNING'S N = 0.009

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 97.11
UPSTREAM ELEVATION(FEET) = 878.85
DOWNSTREAM ELEVATION(FEET) = 877.75
ELEVATION DIFFERENCE(FEET) = 1.10
TC = 0.323*[( 97.11**3)/( 1.10)]**.2 = 4.930
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.697
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8796
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 1.39
TOTAL AREA(ACRES) = 0.34 TOTAL RUNOFF(CFS) = 1.39 **************************************************************************** FLOW PROCESS FROM NODE 51.00 TO NODE 51.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 2 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 1.39 5.00 4.697 0.34
LONGEST FLOWPATH FROM NODE 50.00 TO NODE 51.00 = 97.11 FEET. ** MEMORY BANK # 2 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 5.67 5.48 4.467 1.52
2 5.76 5.64 4.397 1.52
3 5.97 6.12 4.204 1.52
4 5.98 6.16 4.187 1.52
LONGEST FLOWPATH FROM NODE 44.00 TO NODE 51.00 = 482.82 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 6.57 5.00 4.697
2 6.99 5.48 4.467
3 7.07 5.64 4.397
4 7.22 6.12 4.204
5 7.22 6.16 4.187
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 96.84
UPSTREAM ELEVATION(FEET) = 878.85
DOWNSTREAM ELEVATION(FEET) = 877.60
ELEVATION DIFFERENCE(FEET) = 1.25
TC = 0.323*[( 96.84**3)/( 1.25)]**.2 = 4.798
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.697
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8796
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 1.28
TOTAL AREA(ACRES) = 0.31 TOTAL RUNOFF(CFS) = 1.28 **************************************************************************** FLOW PROCESS FROM NODE 54.00 TO NODE 54.00 IS CODE = 10 ---------------------------------------------------------------------------- >>>>>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 3 <<<<< ============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 54.00 TO NODE 54.00 IS CODE = 13 ---------------------------------------------------------------------------- >>>>>CLEAR THE MAIN-STREAM MEMORY<<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 55.00 TO NODE 56.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS APARTMENT
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 217.19
UPSTREAM ELEVATION(FEET) = 881.21
DOWNSTREAM ELEVATION(FEET) = 878.03
ELEVATION DIFFERENCE(FEET) = 3.18
TC = 0.323*[( 217.19**3)/( 3.18)]**.2 = 6.463
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.080
APARTMENT DEVELOPMENT RUNOFF COEFFICIENT = .8770
SOIL CLASSIFICATION IS "C"
SUBAREA RUNOFF(CFS) = 4.00
TOTAL AREA(ACRES) = 1.12 TOTAL RUNOFF(CFS) = 4.00 **************************************************************************** FLOW PROCESS FROM NODE 56.00 TO NODE 57.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 140.51 MANNING'S N = 0.009

PEAK FLOW RATE(CFS) = 12.07 Tc(MIN.) = 6.67
TOTAL AREA(ACRES) = 3.3
**************************************************************************** FLOW PROCESS FROM NODE 57.00 TO NODE 57.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 2 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 57.00 TO NODE 57.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 3 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 57.00 TO NODE 58.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0100
FLOW LENGTH(FEET) = 77.27 MANNING'S N = 0.010
DEPTH OF FLOW IN 18.0 INCH PIPE IS 13.4 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 8.53
GIVEN PIPE DIAMETER(INCH) = 18.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 12.07
PIPE TRAVEL TIME(MIN.) = 0.15 Tc(MIN.) = 6.82
LONGEST FLOWPATH FROM NODE 44.00 TO NODE 58.00 = 611.14 FEET. **************************************************************************** FLOW PROCESS FROM NODE 58.00 TO NODE 58.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 1 WITH THE MAIN-STREAM MEMORY<<<<< ============================================================================ ** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 10.70 5.15 4.619 3.29
2 10.79 5.27 4.564 3.29
3 11.26 5.74 4.352 3.29
4 11.46 5.90 4.287 3.29
5 11.98 6.38 4.108 3.29
6 12.01 6.43 4.092 3.29
7 12.07 6.82 3.961 3.29
LONGEST FLOWPATH FROM NODE 44.00 TO NODE 58.00 = 611.14 FEET. ** MEMORY BANK # 1 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE)
1 10.25 6.76 3.980 3.38
2 10.67 6.93 3.927 3.38
3 11.01 7.11 3.870 3.38
4 11.09 7.16 3.856 3.38
5 11.07 7.21 3.843 3.38
6 11.21 7.30 3.814 3.38
7 11.27 7.53 3.751 3.38
8 11.32 8.60 3.488 3.38
9 11.33 8.75 3.455 3.38
10 8.04 15.83 2.494 3.38
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 58.00 = 1052.76 FEET. ** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 18.67 5.15 4.619
2 18.95 5.27 4.564
3 20.16 5.74 4.352
4 20.60 5.90 4.287
5 21.86 6.38 4.108
6 21.96 6.43 4.092
7 22.22 6.76 3.980
8 22.63 6.82 3.961
9 22.64 6.93 3.927
10 22.81 7.11 3.870
11 22.84 7.16 3.856
12 22.78 7.21 3.843
13 22.83 7.30 3.814
14 22.70 7.53 3.751
15 21.95 8.60 3.488
16 21.86 8.75 3.455
17 15.64 15.83 2.494
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:

PEAK FLOW RATE(CFS) = 22.84 Tc(MIN.) = 7.16
TOTAL AREA(ACRES) = 6.7
**************************************************************************** FLOW PROCESS FROM NODE 58.00 TO NODE 58.00 IS CODE = 12 ---------------------------------------------------------------------------- >>>>>CLEAR MEMORY BANK # 1 <<<<<
============================================================================ **************************************************************************** FLOW PROCESS FROM NODE 58.00 TO NODE 59.00 IS CODE = 41 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<<
>>>>>USING USER-SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< ============================================================================ REPRESENTATIVE SLOPE = 0.0040
FLOW LENGTH(FEET) = 109.46 MANNING'S N = 0.013
DEPTH OF FLOW IN 36.0 INCH PIPE IS 19.2 INCHES
PIPE-FLOW VELOCITY(FEET/SEC.) = 5.97
GIVEN PIPE DIAMETER(INCH) = 36.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 22.84
PIPE TRAVEL TIME(MIN.) = 0.31 Tc(MIN.) = 7.47
LONGEST FLOWPATH FROM NODE 9.00 TO NODE 59.00 = 1162.22 FEET. ============================================================================ END OF STUDY SUMMARY:

TOTAL AREA(ACRES) = 6.7 TC(MIN.) = 7.47 PEAK FLOW RATE(CFS) = 22.84
*** PEAK FLOW RATE TABLE ***
Q(CFS) Tc(MIN.)
1 18.67 5.48
2 18.95 5.59
3 20.16 6.06
4 20.60 6.22
5 21.86 6.69
6 21.96 6.74
7 22.22 7.07
8 22.63 7.12
9 22.64 7.23
10 22.81 7.42
11 22.84 7.47
12 22.78 7.51
13 22.83 7.61
14 22.70 7.84
15 21.95 8.91
16 21.86 9.06
17 15.64 16.17
============================================================================ ============================================================================

END OF RATIONAL METHOD ANALYSIS

Catch Basin A1 - Grate Inlet
Project Description
SpreadSolve For
Input Data
cfs1.48Discharge
ft5.13Gutter Width
ft/ft0.051Gutter Cross Slope
ft/ft0.030Road Cross Slope
ft3.13Grate Width
ft4.0Grate Length
in1.3Local Depression
in1.3Local Depression Width
P-50 mm x
100 mm (P-1-
7/8"-4")
Grate Type
%50.0Clogging
Results
ft5.2Spread
in3.2Depth
in1.3Gutter Depression
in2.6Total Depression
ft²5.0Open Grate Area
ft7.1Active Grate Weir Length

Page 1 of 127 ends

Riverside City CouncilJuly 14, 2026

Riverside City Council
July 14, 2026