Menifee City Council
December 6, 2023

Section 3
Total flow rate = 12.708(CFS)
Time of concentration = 15.936 min.

Effective stream area after confluence = 18.740(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 157.000 to Point/Station 160.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1509.800(Ft.)
Downstream point/station elevation = 1503.800(Ft.)
Pipe length = 307.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 12.708(CFS)
Nearest computed pipe diameter = 18.00(In.)
Calculated individual pipe flow = 12.708(CFS)
Normal flow depth in pipe = 12.94(In.)
Flow top width inside pipe = 16.19(In.)
Critical Depth = 16.10(In.)
Pipe flow velocity = 9.35(Ft/s)
Travel time through pipe = 0.55 min.

Time of concentration (TC) = 16.48 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 157.000 to Point/Station 160.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 3 in normal stream number 1
Stream flow area = 18.740(Ac.)
Runoff from this stream = 12.708(CFS)
Time of concentration = 16.48 min.

Rainfall intensity = 1.091(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 161.000 to Point/Station 162.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 570.000(Ft.)
Top (of initial area) elevation = 1630.000(Ft.)
Bottom (of initial area) elevation = 1535.000(Ft.)
Difference in elevation = 95.000(Ft.)
Slope = 0.16667 s(percent)= 16.67
TC = k(0.530)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 9.600 min.

Rainfall intensity = 1.453(In/Hr) for a 2.0 year storm UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.628
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.500
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.500
RI index for soil(AMC 1) = 67.90
Pervious area fraction = 1.000; Impervious fraction = 0.000 Initial subarea runoff = 1.514(CFS)
Total initial stream area = 1.660(Ac.)
Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 162.000 to Point/Station 160.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1533.000(Ft.)
Downstream point/station elevation = 1503.800(Ft.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Pipe length = 72.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 1.514(CFS)
Nearest computed pipe diameter = 6.00(In.)
Calculated individual pipe flow = 1.514(CFS)
Normal flow depth in pipe = 2.73(In.)
Flow top width inside pipe = 5.97(In.)
Critical depth could not be calculated.

Pipe flow velocity = 17.45(Ft/s)
Travel time through pipe = 0.07 min.

Time of concentration (TC) = 9.67 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 162.000 to Point/Station 160.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 3 in normal stream number 2
Stream flow area = 1.660(Ac.)
Runoff from this stream = 1.514(CFS)
Time of concentration = 9.67 min.

Rainfall intensity = 1.447(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 12.708 16.48 1.091
2 1.514 9.67 1.447
Largest stream flow has longer time of concentration
Qp = 12.708 + sum of
Qb Ia/Ib

1.514 * 0.754 = 1.141
Qp = 13.849
Total of 2 streams to confluence:

Flow rates before confluence point:

12.708 1.514
Area of streams before confluence:

18.740 1.660
Results of confluence:

Total flow rate = 13.849(CFS)
Time of concentration = 16.483 min.

Effective stream area after confluence = 20.400(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 160.000 to Point/Station 135.200 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1503.800(Ft.)
Downstream point/station elevation = 1498.000(Ft.)
Pipe length = 256.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 13.849(CFS)
Nearest computed pipe diameter = 18.00(In.)
Calculated individual pipe flow = 13.849(CFS)
Normal flow depth in pipe = 13.05(In.)
Flow top width inside pipe = 16.07(In.)
Critical Depth = 16.52(In.)
Pipe flow velocity = 10.09(Ft/s)
Travel time through pipe = 0.42 min.

Time of concentration (TC) = 16.91 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Process from Point/Station 160.000 to Point/Station 135.200 **** CONFLUENCE OF MAIN STREAMS ****
______________________________________________________________________ The following data inside Main Stream is listed:

In Main Stream number: 3
Stream flow area = 20.400(Ac.)
Runoff from this stream = 13.849(CFS)
Time of concentration = 16.91 min.

Rainfall intensity = 1.076(In/Hr)
Program is now starting with Main Stream No. 4
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 128.000 to Point/Station 140.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 580.000(Ft.)
Top (of initial area) elevation = 1529.800(Ft.)
Bottom (of initial area) elevation = 1523.300(Ft.)
Difference in elevation = 6.500(Ft.)
Slope = 0.01121 s(percent)= 1.12
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 12.205 min.

Rainfall intensity = 1.279(In/Hr) for a 2.0 year storm SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.702
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 1.000
RI index for soil(AMC 1) = 57.00
Pervious area fraction = 0.500; Impervious fraction = 0.500 Initial subarea runoff = 1.167(CFS)
Total initial stream area = 1.300(Ac.)
Pervious area fraction = 0.500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 140.000 to Point/Station 141.000 **** STREET FLOW TRAVEL TIME + SUBAREA FLOW ADDITION **** ______________________________________________________________________ Top of street segment elevation = 1523.300(Ft.)
End of street segment elevation = 1504.000(Ft.)
Length of street segment = 1420.000(Ft.)
Height of curb above gutter flowline = 8.0(In.)
Width of half street (curb to crown) = 38.000(Ft.)
Distance from crown to crossfall grade break = 20.000(Ft.) Slope from gutter to grade break (v/hz) = 0.020
Slope from grade break to crown (v/hz) = 0.020
Street flow is on [1] side(s) of the street
Distance from curb to property line = 40.000(Ft.)
Slope from curb to property line (v/hz) = 0.020
Gutter width = 2.000(Ft.)
Gutter hike from flowline = 2.000(In.)
Manning's N in gutter = 0.0130
Manning's N from gutter to grade break = 0.0130
Manning's N from grade break to crown = 0.0130
Estimated mean flow rate at midpoint of street = 2.142(CFS) Depth of flow = 0.289(Ft.), Average velocity = 2.739(Ft/s) Streetflow hydraulics at midpoint of street travel:

Halfstreet flow width = 8.096(Ft.)
Flow velocity = 2.74(Ft/s)
Travel time = 8.64 min. TC = 20.85 min.

Adding area flow to street
SINGLE FAMILY (1/4 Acre Lot)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Runoff Coefficient = 0.620
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.500
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.500
RI index for soil(AMC 1) = 45.60
Pervious area fraction = 0.500; Impervious fraction = 0.500 Rainfall intensity = 0.963(In/Hr) for a 2.0 year storm Subarea runoff = 1.886(CFS) for 3.160(Ac.)
Total runoff = 3.053(CFS) Total area = 4.460(Ac.) Street flow at end of street = 3.053(CFS)
Half street flow at end of street = 3.053(CFS)
Depth of flow = 0.317(Ft.), Average velocity = 2.962(Ft/s) Flow width (from curb towards crown)= 9.508(Ft.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 141.000 to Point/Station 142.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1498.800(Ft.)
Downstream point/station elevation = 1498.000(Ft.)
Pipe length = 70.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 3.053(CFS)
Nearest computed pipe diameter = 12.00(In.)
Calculated individual pipe flow = 3.053(CFS)
Normal flow depth in pipe = 8.13(In.)
Flow top width inside pipe = 11.22(In.)
Critical Depth = 8.99(In.)
Pipe flow velocity = 5.39(Ft/s)
Travel time through pipe = 0.22 min.

Time of concentration (TC) = 21.06 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 141.000 to Point/Station 142.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 4 in normal stream number 1
Stream flow area = 4.460(Ac.)
Runoff from this stream = 3.053(CFS)
Time of concentration = 21.06 min.

Rainfall intensity = 0.958(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 117.000 to Point/Station 143.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 722.000(Ft.)
Top (of initial area) elevation = 1543.800(Ft.)
Bottom (of initial area) elevation = 1537.300(Ft.)
Difference in elevation = 6.500(Ft.)
Slope = 0.00900 s(percent)= 0.90
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 13.919 min.

Rainfall intensity = 1.193(In/Hr) for a 2.0 year storm SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.643
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.500
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.500
RI index for soil(AMC 1) = 45.60
Pervious area fraction = 0.500; Impervious fraction = 0.500 Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Initial subarea runoff = 0.882(CFS)
Total initial stream area = 1.150(Ac.)
Pervious area fraction = 0.500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 143.000 to Point/Station 144.000 **** STREET FLOW TRAVEL TIME + SUBAREA FLOW ADDITION **** ______________________________________________________________________ Top of street segment elevation = 1537.300(Ft.)
End of street segment elevation = 1528.600(Ft.)
Length of street segment = 863.000(Ft.)
Height of curb above gutter flowline = 8.0(In.)
Width of half street (curb to crown) = 38.000(Ft.)
Distance from crown to crossfall grade break = 20.000(Ft.) Slope from gutter to grade break (v/hz) = 0.020
Slope from grade break to crown (v/hz) = 0.020
Street flow is on [1] side(s) of the street
Distance from curb to property line = 40.000(Ft.)
Slope from curb to property line (v/hz) = 0.020
Gutter width = 2.000(Ft.)
Gutter hike from flowline = 2.000(In.)
Manning's N in gutter = 0.0130
Manning's N from gutter to grade break = 0.0130
Manning's N from grade break to crown = 0.0130
Estimated mean flow rate at midpoint of street = 1.344(CFS) Depth of flow = 0.266(Ft.), Average velocity = 2.208(Ft/s) Streetflow hydraulics at midpoint of street travel:

Halfstreet flow width = 6.944(Ft.)
Flow velocity = 2.21(Ft/s)
Travel time = 6.52 min. TC = 20.43 min.

Adding area flow to street
SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.661
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.100
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.900
RI index for soil(AMC 1) = 54.72
Pervious area fraction = 0.500; Impervious fraction = 0.500 Rainfall intensity = 0.973(In/Hr) for a 2.0 year storm Subarea runoff = 0.843(CFS) for 1.310(Ac.)
Total runoff = 1.725(CFS) Total area = 2.460(Ac.) Street flow at end of street = 1.725(CFS)
Half street flow at end of street = 1.725(CFS)
Depth of flow = 0.284(Ft.), Average velocity = 2.325(Ft/s) Flow width (from curb towards crown)= 7.843(Ft.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 144.000 to Point/Station 145.000 **** STREET FLOW TRAVEL TIME + SUBAREA FLOW ADDITION **** ______________________________________________________________________ Top of street segment elevation = 1528.600(Ft.)
End of street segment elevation = 1498.100(Ft.)
Length of street segment = 1850.000(Ft.)
Height of curb above gutter flowline = 8.0(In.)
Width of half street (curb to crown) = 38.000(Ft.)
Distance from crown to crossfall grade break = 20.000(Ft.) Slope from gutter to grade break (v/hz) = 0.020
Slope from grade break to crown (v/hz) = 0.020
Street flow is on [1] side(s) of the street
Distance from curb to property line = 40.000(Ft.)
Slope from curb to property line (v/hz) = 0.020
Gutter width = 2.000(Ft.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Gutter hike from flowline = 2.000(In.)
Manning's N in gutter = 0.0130
Manning's N from gutter to grade break = 0.0130
Manning's N from grade break to crown = 0.0130
Estimated mean flow rate at midpoint of street = 2.438(CFS) Depth of flow = 0.291(Ft.), Average velocity = 3.038(Ft/s) Streetflow hydraulics at midpoint of street travel:

Halfstreet flow width = 8.220(Ft.)
Flow velocity = 3.04(Ft/s)
Travel time = 10.15 min. TC = 30.58 min.

Adding area flow to street
SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.599
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.500
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.500
RI index for soil(AMC 1) = 45.60
Pervious area fraction = 0.500; Impervious fraction = 0.500 Rainfall intensity = 0.786(In/Hr) for a 2.0 year storm Subarea runoff = 1.342(CFS) for 2.850(Ac.)
Total runoff = 3.066(CFS) Total area = 5.310(Ac.) Street flow at end of street = 3.066(CFS)
Half street flow at end of street = 3.066(CFS)
Depth of flow = 0.309(Ft.), Average velocity = 3.196(Ft/s) Flow width (from curb towards crown)= 9.126(Ft.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 145.000 to Point/Station 142.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1498.600(Ft.)
Downstream point/station elevation = 1498.100(Ft.)
Pipe length = 50.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 3.066(CFS)
Nearest computed pipe diameter = 12.00(In.)
Calculated individual pipe flow = 3.066(CFS)
Normal flow depth in pipe = 8.58(In.)
Flow top width inside pipe = 10.84(In.)
Critical Depth = 9.01(In.)
Pipe flow velocity = 5.10(Ft/s)
Travel time through pipe = 0.16 min.

Time of concentration (TC) = 30.75 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 145.000 to Point/Station 142.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 4 in normal stream number 2
Stream flow area = 5.310(Ac.)
Runoff from this stream = 3.066(CFS)
Time of concentration = 30.75 min.

Rainfall intensity = 0.784(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 3.053 21.06 0.958
2 3.066 30.75 0.784
Largest stream flow has longer time of concentration
Qp = 3.066 + sum of
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Qb Ia/Ib

3.053 * 0.818 = 2.499
Qp = 5.565
Total of 2 streams to confluence:

Flow rates before confluence point:

3.053 3.066
Area of streams before confluence:

4.460 5.310
Results of confluence:

Total flow rate = 5.565(CFS)
Time of concentration = 30.746 min.

Effective stream area after confluence = 9.770(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 142.000 to Point/Station 134.400 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1498.100(Ft.)
Downstream point/station elevation = 1496.000(Ft.)
Pipe length = 116.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 5.565(CFS)
Nearest computed pipe diameter = 15.00(In.)
Calculated individual pipe flow = 5.565(CFS)
Normal flow depth in pipe = 8.72(In.)
Flow top width inside pipe = 14.80(In.)
Critical Depth = 11.47(In.)
Pipe flow velocity = 7.51(Ft/s)
Travel time through pipe = 0.26 min.

Time of concentration (TC) = 31.00 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 142.000 to Point/Station 134.400 **** CONFLUENCE OF MAIN STREAMS ****
______________________________________________________________________ The following data inside Main Stream is listed:

In Main Stream number: 4
Stream flow area = 9.770(Ac.)
Runoff from this stream = 5.565(CFS)
Time of concentration = 31.00 min.

Rainfall intensity = 0.780(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 39.029 14.85 1.153
2 2.786 14.30 1.176
3 13.849 16.91 1.076
4 5.565 31.00 0.780
Largest stream flow has longer or shorter time of concentration Qp = 39.029 + sum of
Qb Ia/Ib

2.786 * 0.980 = 2.731
Qa Tb/Ta

13.849 * 0.878 = 12.162
Qa Tb/Ta

5.565 * 0.479 = 2.665
Qp = 56.586
Total of 4 main streams to confluence:

Flow rates before confluence point:

Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3

39.029 2.786 13.849 5.565
Area of streams before confluence:

59.770 4.150 20.400 9.770
Results of confluence:

Total flow rate = 56.586(CFS)
Time of concentration = 14.846 min.

Effective stream area after confluence = 94.090(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 142.000 to Point/Station 134.400 **** SUBAREA FLOW ADDITION ****
______________________________________________________________________ UNDEVELOPED (fair cover) subarea
Runoff Coefficient = 0.416
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 1) = 49.80
Pervious area fraction = 1.000; Impervious fraction = 0.000 Time of concentration = 14.85 min.

Rainfall intensity = 1.153(In/Hr) for a 2.0 year storm Subarea runoff = 0.858(CFS) for 1.790(Ac.)
Total runoff = 57.444(CFS) Total area = 95.880(Ac.) End of computations, total study area = 95.88 (Ac.) The following figures may
be used for a unit hydrograph study of the same area.

Area averaged pervious area fraction(Ap) = 0.724
Area averaged RI index number = 70.6
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
· Area ‘A’ – 10 Year Post-Development Condition – Rational Method Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Riverside County Rational Hydrology Program
CIVILCADD/CIVILDESIGN Engineering Software,(c) 1989 - 2014 Version 9.0 Rational Hydrology Study Date: 11/08/21 File:PR010.out ------------------------------------------------------------------------ TRACT 31194 - 'GOLDEN MEADOWS' MAJOR MODIFICATION
PRELIMINARY HYDROLOGY STUDY – AREA ‘A’
DEVELOPED CONDITION RATIONAL METHOD - 10 YEAR STORM
HUNSAKER & ASSOCIATES, MAY 2021, BRIAN LOWELL, PE
------------------------------------------------------------------------ ********* Hydrology Study Control Information ********** English (in-lb) Units used in input data file
------------------------------------------------------------------------ Program License Serial Number 6406
------------------------------------------------------------------------ Rational Method Hydrology Program based on
Riverside County Flood Control & Water Conservation District 1978 hydrology manual
Storm event (year) = 10.00 Antecedent Moisture Condition = 2 2 year, 1 hour precipitation = 0.550(In.)
100 year, 1 hour precipitation = 1.300(In.)
Storm event year = 10.0
Calculated rainfall intensity data:
1 hour intensity = 0.859(In/Hr)
Slope of intensity duration curve = 0.5300
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 100.000 to Point/Station 101.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 448.000(Ft.)
Top (of initial area) elevation = 1800.000(Ft.)
Bottom (of initial area) elevation = 1660.000(Ft.)
Difference in elevation = 140.000(Ft.)
Slope = 0.31250 s(percent)= 31.25
TC = k(0.530)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 7.688 min.

Rainfall intensity = 2.551(In/Hr) for a 10.0 year storm UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.784
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000 Initial subarea runoff = 6.563(CFS)
Total initial stream area = 3.280(Ac.)
Pervious area fraction = 1.000
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 101.000 to Point/Station 102.000 **** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
______________________________________________________________________ Top of natural channel elevation = 1660.000(Ft.)
End of natural channel elevation = 1565.300(Ft.)
Length of natural channel = 618.000(Ft.)
Estimated mean flow rate at midpoint of channel = 15.687(CFS) Natural valley channel type used
L.A. County flood control district formula for channel velocity:

Velocity(ft/s) = (7 + 8(q(English Units)^.352)(slope^0.5) Velocity using mean channel flow = 10.38(Ft/s)
Correction to map slope used on extremely rugged channels with drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.1532
Corrected/adjusted channel slope = 0.1366
Travel time = 0.99 min. TC = 8.68 min.

Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.778
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000 Rainfall intensity = 2.392(In/Hr) for a 10.0 year storm Subarea runoff = 16.966(CFS) for 9.120(Ac.)
Total runoff = 23.529(CFS) Total area = 12.400(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 102.000 to Point/Station 102.100 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1565.300(Ft.)
Downstream point/station elevation = 1563.000(Ft.)
Pipe length = 123.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 23.529(CFS)
Nearest computed pipe diameter = 24.00(In.)
Calculated individual pipe flow = 23.529(CFS)
Normal flow depth in pipe = 15.66(In.)
Flow top width inside pipe = 22.86(In.)
Critical Depth = 20.66(In.)
Pipe flow velocity = 10.84(Ft/s)
Travel time through pipe = 0.19 min.

Time of concentration (TC) = 8.87 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 102.100 to Point/Station 102.100 **** SUBAREA FLOW ADDITION ****
______________________________________________________________________ SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.762
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 2) = 56.00
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Pervious area fraction = 0.500; Impervious fraction = 0.500 Time of concentration = 8.87 min.

Rainfall intensity = 2.365(In/Hr) for a 10.0 year storm Subarea runoff = 1.856(CFS) for 1.030(Ac.)
Total runoff = 25.385(CFS) Total area = 13.430(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 102.100 to Point/Station 103.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1563.000(Ft.)
Downstream point/station elevation = 1549.000(Ft.)
Pipe length = 671.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 25.385(CFS)
Nearest computed pipe diameter = 24.00(In.)
Calculated individual pipe flow = 25.385(CFS)
Normal flow depth in pipe = 15.89(In.)
Flow top width inside pipe = 22.70(In.)
Critical Depth = 21.24(In.)
Pipe flow velocity = 11.49(Ft/s)
Travel time through pipe = 0.97 min.

Time of concentration (TC) = 9.84 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 102.100 to Point/Station 103.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 1
Stream flow area = 13.430(Ac.)
Runoff from this stream = 25.385(CFS)
Time of concentration = 9.84 min.

Rainfall intensity = 2.238(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 25.385 9.84 2.238
Largest stream flow has longer time of concentration
Qp = 25.385 + sum of
Qp = 25.385
Total of 1 streams to confluence:

Flow rates before confluence point:

25.385
Area of streams before confluence:

13.430
Results of confluence:

Total flow rate = 25.385(CFS)
Time of concentration = 9.843 min.

Effective stream area after confluence = 13.430(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 104.000 to Point/Station 105.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 425.000(Ft.)
Top (of initial area) elevation = 1572.000(Ft.)
Bottom (of initial area) elevation = 1556.200(Ft.)
Difference in elevation = 15.800(Ft.)
Slope = 0.03718 s(percent)= 3.72
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 8.479 min.

Rainfall intensity = 2.422(In/Hr) for a 10.0 year storm SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.764
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 2) = 56.00
Pervious area fraction = 0.500; Impervious fraction = 0.500 Initial subarea runoff = 1.758(CFS)
Total initial stream area = 0.950(Ac.)
Pervious area fraction = 0.500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 105.000 to Point/Station 103.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1549.200(Ft.)
Downstream point/station elevation = 1549.000(Ft.)
Pipe length = 15.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 1.758(CFS)
Nearest computed pipe diameter = 9.00(In.)
Calculated individual pipe flow = 1.758(CFS)
Normal flow depth in pipe = 6.81(In.)
Flow top width inside pipe = 7.73(In.)
Critical Depth = 7.29(In.)
Pipe flow velocity = 4.91(Ft/s)
Travel time through pipe = 0.05 min.

Time of concentration (TC) = 8.53 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 105.000 to Point/Station 103.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 2
Stream flow area = 0.950(Ac.)
Runoff from this stream = 1.758(CFS)
Time of concentration = 8.53 min.

Rainfall intensity = 2.414(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 25.385 9.84 2.238
2 1.758 8.53 2.414
Largest stream flow has longer time of concentration
Qp = 25.385 + sum of
Qb Ia/Ib

1.758 * 0.927 = 1.630
Qp = 27.015
Total of 2 streams to confluence:

Flow rates before confluence point:

25.385 1.758
Area of streams before confluence:

13.430 0.950
Results of confluence:

Total flow rate = 27.015(CFS)
Time of concentration = 9.843 min.

Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Effective stream area after confluence = 14.380(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 103.000 to Point/Station 106.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1549.000(Ft.)
Downstream point/station elevation = 1548.700(Ft.)
Pipe length = 29.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 27.015(CFS)
Nearest computed pipe diameter = 27.00(In.)
Calculated individual pipe flow = 27.015(CFS)
Normal flow depth in pipe = 19.27(In.)
Flow top width inside pipe = 24.41(In.)
Critical Depth = 21.75(In.)
Pipe flow velocity = 8.91(Ft/s)
Travel time through pipe = 0.05 min.

Time of concentration (TC) = 9.90 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 103.000 to Point/Station 106.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 1
Stream flow area = 14.380(Ac.)
Runoff from this stream = 27.015(CFS)
Time of concentration = 9.90 min.

Rainfall intensity = 2.231(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 104.000 to Point/Station 107.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 553.000(Ft.)
Top (of initial area) elevation = 1572.000(Ft.)
Bottom (of initial area) elevation = 1564.600(Ft.)
Difference in elevation = 7.400(Ft.)
Slope = 0.01338 s(percent)= 1.34
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 11.557 min.

Rainfall intensity = 2.055(In/Hr) for a 10.0 year storm SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.748
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 2) = 56.00
Pervious area fraction = 0.500; Impervious fraction = 0.500 Initial subarea runoff = 1.814(CFS)
Total initial stream area = 1.180(Ac.)
Pervious area fraction = 0.500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 107.000 to Point/Station 108.000 **** STREET FLOW TRAVEL TIME + SUBAREA FLOW ADDITION **** ______________________________________________________________________ Top of street segment elevation = 1564.600(Ft.)
End of street segment elevation = 1556.200(Ft.)
Length of street segment = 684.000(Ft.)
Height of curb above gutter flowline = 6.0(In.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Width of half street (curb to crown) = 18.000(Ft.)
Distance from crown to crossfall grade break = 16.000(Ft.) Slope from gutter to grade break (v/hz) = 0.020
Slope from grade break to crown (v/hz) = 0.020
Street flow is on [1] side(s) of the street
Distance from curb to property line = 10.000(Ft.)
Slope from curb to property line (v/hz) = 0.020
Gutter width = 2.000(Ft.)
Gutter hike from flowline = 2.000(In.)
Manning's N in gutter = 0.0130
Manning's N from gutter to grade break = 0.0130
Manning's N from grade break to crown = 0.0130
Estimated mean flow rate at midpoint of street = 2.988(CFS) Depth of flow = 0.319(Ft.), Average velocity = 2.835(Ft/s) Streetflow hydraulics at midpoint of street travel:

Halfstreet flow width = 9.631(Ft.)
Flow velocity = 2.83(Ft/s)
Travel time = 4.02 min. TC = 15.58 min.

Adding area flow to street
SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.751
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.750
Decimal fraction soil group C = 0.050
Decimal fraction soil group D = 0.200
RI index for soil(AMC 2) = 60.45
Pervious area fraction = 0.500; Impervious fraction = 0.500 Rainfall intensity = 1.754(In/Hr) for a 10.0 year storm Subarea runoff = 2.252(CFS) for 1.710(Ac.)
Total runoff = 4.066(CFS) Total area = 2.890(Ac.) Street flow at end of street = 4.066(CFS)
Half street flow at end of street = 4.066(CFS)
Depth of flow = 0.347(Ft.), Average velocity = 3.042(Ft/s) Flow width (from curb towards crown)= 10.999(Ft.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 108.000 to Point/Station 106.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1549.200(Ft.)
Downstream point/station elevation = 1548.700(Ft.)
Pipe length = 42.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 4.066(CFS)
Nearest computed pipe diameter = 15.00(In.)
Calculated individual pipe flow = 4.066(CFS)
Normal flow depth in pipe = 8.17(In.)
Flow top width inside pipe = 14.94(In.)
Critical Depth = 9.79(In.)
Pipe flow velocity = 5.95(Ft/s)
Travel time through pipe = 0.12 min.

Time of concentration (TC) = 15.70 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 108.000 to Point/Station 106.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 2
Stream flow area = 2.890(Ac.)
Runoff from this stream = 4.066(CFS)
Time of concentration = 15.70 min.

Rainfall intensity = 1.747(In/Hr)
Summary of stream data:

Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 27.015 9.90 2.231
2 4.066 15.70 1.747
Largest stream flow has longer or shorter time of concentration Qp = 27.015 + sum of
Qa Tb/Ta

4.066 * 0.631 = 2.564
Qp = 29.578
Total of 2 streams to confluence:

Flow rates before confluence point:

27.015 4.066
Area of streams before confluence:

14.380 2.890
Results of confluence:

Total flow rate = 29.578(CFS)
Time of concentration = 9.897 min.

Effective stream area after confluence = 17.270(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 106.000 to Point/Station 109.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1548.700(Ft.)
Downstream point/station elevation = 1523.000(Ft.)
Pipe length = 620.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 29.578(CFS)
Nearest computed pipe diameter = 21.00(In.)
Calculated individual pipe flow = 29.578(CFS)
Normal flow depth in pipe = 15.82(In.)
Flow top width inside pipe = 18.10(In.)
Critical depth could not be calculated.

Pipe flow velocity = 15.21(Ft/s)
Travel time through pipe = 0.68 min.

Time of concentration (TC) = 10.58 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 106.000 to Point/Station 109.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 1
Stream flow area = 17.270(Ac.)
Runoff from this stream = 29.578(CFS)
Time of concentration = 10.58 min.

Rainfall intensity = 2.154(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 110.000 to Point/Station 111.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 530.000(Ft.)
Top (of initial area) elevation = 1540.000(Ft.)
Bottom (of initial area) elevation = 1530.000(Ft.)
Difference in elevation = 10.000(Ft.)
Slope = 0.01887 s(percent)= 1.89
TC = k(0.710)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 19.312 min.

Rainfall intensity = 1.566(In/Hr) for a 10.0 year storm UNDEVELOPED (fair cover) subarea
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Runoff Coefficient = 0.756
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.150
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.850
RI index for soil(AMC 2) = 81.75
Pervious area fraction = 1.000; Impervious fraction = 0.000 Initial subarea runoff = 3.481(CFS)
Total initial stream area = 2.940(Ac.)
Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 111.000 to Point/Station 109.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1523.400(Ft.)
Downstream point/station elevation = 1523.000(Ft.)
Pipe length = 40.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 3.481(CFS)
Nearest computed pipe diameter = 12.00(In.)
Calculated individual pipe flow = 3.481(CFS)
Normal flow depth in pipe = 9.60(In.)
Flow top width inside pipe = 9.60(In.)
Critical Depth = 9.57(In.)
Pipe flow velocity = 5.17(Ft/s)
Travel time through pipe = 0.13 min.

Time of concentration (TC) = 19.44 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 111.000 to Point/Station 109.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 2
Stream flow area = 2.940(Ac.)
Runoff from this stream = 3.481(CFS)
Time of concentration = 19.44 min.

Rainfall intensity = 1.560(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 29.578 10.58 2.154
2 3.481 19.44 1.560
Largest stream flow has longer or shorter time of concentration Qp = 29.578 + sum of
Qa Tb/Ta

3.481 * 0.544 = 1.894
Qp = 31.472
Total of 2 streams to confluence:

Flow rates before confluence point:

29.578 3.481
Area of streams before confluence:

17.270 2.940
Results of confluence:

Total flow rate = 31.472(CFS)
Time of concentration = 10.576 min.

Effective stream area after confluence = 20.210(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Process from Point/Station 109.000 to Point/Station 112.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1523.000(Ft.)
Downstream point/station elevation = 1520.800(Ft.)
Pipe length = 38.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 31.472(CFS)
Nearest computed pipe diameter = 21.00(In.)
Calculated individual pipe flow = 31.472(CFS)
Normal flow depth in pipe = 14.54(In.)
Flow top width inside pipe = 19.38(In.)
Critical depth could not be calculated.

Pipe flow velocity = 17.71(Ft/s)
Travel time through pipe = 0.04 min.

Time of concentration (TC) = 10.61 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 109.000 to Point/Station 112.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 1
Stream flow area = 20.210(Ac.)
Runoff from this stream = 31.472(CFS)
Time of concentration = 10.61 min.

Rainfall intensity = 2.150(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 113.000 to Point/Station 114.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 965.000(Ft.)
Top (of initial area) elevation = 1567.900(Ft.)
Bottom (of initial area) elevation = 1556.000(Ft.)
Difference in elevation = 11.900(Ft.)
Slope = 0.01233 s(percent)= 1.23
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 14.678 min.

Rainfall intensity = 1.811(In/Hr) for a 10.0 year storm SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.782
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.300
Decimal fraction soil group C = 0.300
Decimal fraction soil group D = 0.400
RI index for soil(AMC 2) = 67.50
Pervious area fraction = 0.500; Impervious fraction = 0.500 Initial subarea runoff = 4.008(CFS)
Total initial stream area = 2.830(Ac.)
Pervious area fraction = 0.500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 114.000 to Point/Station 115.000 **** STREET FLOW TRAVEL TIME + SUBAREA FLOW ADDITION **** ______________________________________________________________________ Top of street segment elevation = 1556.000(Ft.)
End of street segment elevation = 1529.800(Ft.)
Length of street segment = 610.000(Ft.)
Height of curb above gutter flowline = 6.0(In.)
Width of half street (curb to crown) = 18.000(Ft.)
Distance from crown to crossfall grade break = 16.000(Ft.) Slope from gutter to grade break (v/hz) = 0.020
Slope from grade break to crown (v/hz) = 0.020
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Street flow is on [1] side(s) of the street
Distance from curb to property line = 10.000(Ft.)
Slope from curb to property line (v/hz) = 0.020
Gutter width = 2.000(Ft.)
Gutter hike from flowline = 2.000(In.)
Manning's N in gutter = 0.0130
Manning's N from gutter to grade break = 0.0130
Manning's N from grade break to crown = 0.0130
Estimated mean flow rate at midpoint of street = 5.326(CFS) Depth of flow = 0.315(Ft.), Average velocity = 5.244(Ft/s) Streetflow hydraulics at midpoint of street travel:

Halfstreet flow width = 9.429(Ft.)
Flow velocity = 5.24(Ft/s)
Travel time = 1.94 min. TC = 16.62 min.

Adding area flow to street
SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.752
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.700
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.300
RI index for soil(AMC 2) = 61.70
Pervious area fraction = 0.500; Impervious fraction = 0.500 Rainfall intensity = 1.695(In/Hr) for a 10.0 year storm Subarea runoff = 2.564(CFS) for 2.010(Ac.)
Total runoff = 6.572(CFS) Total area = 4.840(Ac.) Street flow at end of street = 6.572(CFS)
Half street flow at end of street = 6.572(CFS)
Depth of flow = 0.333(Ft.), Average velocity = 5.501(Ft/s) Flow width (from curb towards crown)= 10.335(Ft.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 115.000 to Point/Station 112.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1521.200(Ft.)
Downstream point/station elevation = 1520.800(Ft.)
Pipe length = 30.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 6.572(CFS)
Nearest computed pipe diameter = 15.00(In.)
Calculated individual pipe flow = 6.572(CFS)
Normal flow depth in pipe = 10.93(In.)
Flow top width inside pipe = 13.34(In.)
Critical Depth = 12.39(In.)
Pipe flow velocity = 6.86(Ft/s)
Travel time through pipe = 0.07 min.

Time of concentration (TC) = 16.69 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 115.000 to Point/Station 112.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 2
Stream flow area = 4.840(Ac.)
Runoff from this stream = 6.572(CFS)
Time of concentration = 16.69 min.

Rainfall intensity = 1.692(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 104.000 to Point/Station 127.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Initial area flow distance = 623.000(Ft.)
Top (of initial area) elevation = 1572.000(Ft.)
Bottom (of initial area) elevation = 1552.000(Ft.)
Difference in elevation = 20.000(Ft.)
Slope = 0.03210 s(percent)= 3.21
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 10.175 min.

Rainfall intensity = 2.199(In/Hr) for a 10.0 year storm SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.755
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 2) = 56.00
Pervious area fraction = 0.500; Impervious fraction = 0.500 Initial subarea runoff = 2.954(CFS)
Total initial stream area = 1.780(Ac.)
Pervious area fraction = 0.500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 127.000 to Point/Station 128.000 **** STREET FLOW TRAVEL TIME + SUBAREA FLOW ADDITION **** ______________________________________________________________________ Top of street segment elevation = 1552.000(Ft.)
End of street segment elevation = 1529.800(Ft.)
Length of street segment = 518.000(Ft.)
Height of curb above gutter flowline = 6.0(In.)
Width of half street (curb to crown) = 18.000(Ft.)
Distance from crown to crossfall grade break = 16.000(Ft.) Slope from gutter to grade break (v/hz) = 0.020
Slope from grade break to crown (v/hz) = 0.020
Street flow is on [1] side(s) of the street
Distance from curb to property line = 10.000(Ft.)
Slope from curb to property line (v/hz) = 0.020
Gutter width = 2.000(Ft.)
Gutter hike from flowline = 2.000(In.)
Manning's N in gutter = 0.0130
Manning's N from gutter to grade break = 0.0130
Manning's N from grade break to crown = 0.0130
Estimated mean flow rate at midpoint of street = 4.491(CFS) Depth of flow = 0.301(Ft.), Average velocity = 5.044(Ft/s) Streetflow hydraulics at midpoint of street travel:

Halfstreet flow width = 8.739(Ft.)
Flow velocity = 5.04(Ft/s)
Travel time = 1.71 min. TC = 11.89 min.

Adding area flow to street
SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.769
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.700
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.300
RI index for soil(AMC 2) = 61.70
Pervious area fraction = 0.500; Impervious fraction = 0.500 Rainfall intensity = 2.025(In/Hr) for a 10.0 year storm Subarea runoff = 2.976(CFS) for 1.910(Ac.)
Total runoff = 5.930(CFS) Total area = 3.690(Ac.) Street flow at end of street = 5.930(CFS)
Half street flow at end of street = 5.930(CFS)
Depth of flow = 0.324(Ft.), Average velocity = 5.369(Ft/s) Flow width (from curb towards crown)= 9.889(Ft.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 128.000 to Point/Station 112.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1521.200(Ft.)
Downstream point/station elevation = 1520.800(Ft.)
Pipe length = 45.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 5.930(CFS)
Nearest computed pipe diameter = 15.00(In.)
Calculated individual pipe flow = 5.930(CFS)
Normal flow depth in pipe = 11.95(In.)
Flow top width inside pipe = 12.07(In.)
Critical Depth = 11.82(In.)
Pipe flow velocity = 5.66(Ft/s)
Travel time through pipe = 0.13 min.

Time of concentration (TC) = 12.02 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 128.000 to Point/Station 112.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 3
Stream flow area = 3.690(Ac.)
Runoff from this stream = 5.930(CFS)
Time of concentration = 12.02 min.

Rainfall intensity = 2.013(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 31.472 10.61 2.150
2 6.572 16.69 1.692
3 5.930 12.02 2.013
Largest stream flow has longer or shorter time of concentration Qp = 31.472 + sum of
Qa Tb/Ta

6.572 * 0.636 = 4.179
Qa Tb/Ta

5.930 * 0.883 = 5.235
Qp = 40.886
Total of 3 streams to confluence:

Flow rates before confluence point:

31.472 6.572 5.930
Area of streams before confluence:

20.210 4.840 3.690
Results of confluence:

Total flow rate = 40.886(CFS)
Time of concentration = 10.612 min.

Effective stream area after confluence = 28.740(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 112.000 to Point/Station 116.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1520.800(Ft.)
Downstream point/station elevation = 1520.000(Ft.)
Pipe length = 32.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 40.886(CFS)
Nearest computed pipe diameter = 27.00(In.)
Calculated individual pipe flow = 40.886(CFS)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Normal flow depth in pipe = 18.87(In.)
Flow top width inside pipe = 24.77(In.)
Critical Depth = 25.24(In.)
Pipe flow velocity = 13.79(Ft/s)
Travel time through pipe = 0.04 min.

Time of concentration (TC) = 10.65 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 112.000 to Point/Station 116.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 1
Stream flow area = 28.740(Ac.)
Runoff from this stream = 40.886(CFS)
Time of concentration = 10.65 min.

Rainfall intensity = 2.146(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 117.000 to Point/Station 118.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 500.000(Ft.)
Top (of initial area) elevation = 1543.800(Ft.)
Bottom (of initial area) elevation = 1539.300(Ft.)
Difference in elevation = 4.500(Ft.)
Slope = 0.00900 s(percent)= 0.90
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 12.017 min.

Rainfall intensity = 2.013(In/Hr) for a 10.0 year storm SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.784
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.500
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.500
RI index for soil(AMC 2) = 65.50
Pervious area fraction = 0.500; Impervious fraction = 0.500 Initial subarea runoff = 1.404(CFS)
Total initial stream area = 0.890(Ac.)
Pervious area fraction = 0.500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 118.000 to Point/Station 119.000 **** STREET FLOW TRAVEL TIME + SUBAREA FLOW ADDITION **** ______________________________________________________________________ Top of street segment elevation = 1539.300(Ft.)
End of street segment elevation = 1529.800(Ft.)
Length of street segment = 933.000(Ft.)
Height of curb above gutter flowline = 8.0(In.)
Width of half street (curb to crown) = 38.000(Ft.)
Distance from crown to crossfall grade break = 20.000(Ft.) Slope from gutter to grade break (v/hz) = 0.020
Slope from grade break to crown (v/hz) = 0.020
Street flow is on [1] side(s) of the street
Distance from curb to property line = 40.000(Ft.)
Slope from curb to property line (v/hz) = 0.020
Gutter width = 2.000(Ft.)
Gutter hike from flowline = 2.000(In.)
Manning's N in gutter = 0.0130
Manning's N from gutter to grade break = 0.0130
Manning's N from grade break to crown = 0.0130
Estimated mean flow rate at midpoint of street = 2.505(CFS) Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Depth of flow = 0.312(Ft.), Average velocity = 2.533(Ft/s) Streetflow hydraulics at midpoint of street travel:

Halfstreet flow width = 9.284(Ft.)
Flow velocity = 2.53(Ft/s)
Travel time = 6.14 min. TC = 18.16 min.

Adding area flow to street
SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.780
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.300
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.700
RI index for soil(AMC 2) = 69.30
Pervious area fraction = 0.500; Impervious fraction = 0.500 Rainfall intensity = 1.618(In/Hr) for a 10.0 year storm Subarea runoff = 2.132(CFS) for 1.690(Ac.)
Total runoff = 3.536(CFS) Total area = 2.580(Ac.) Street flow at end of street = 3.536(CFS)
Half street flow at end of street = 3.536(CFS)
Depth of flow = 0.342(Ft.), Average velocity = 2.741(Ft/s) Flow width (from curb towards crown)= 10.786(Ft.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 119.000 to Point/Station 116.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1521.400(Ft.)
Downstream point/station elevation = 1520.000(Ft.)
Pipe length = 57.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 3.536(CFS)
Nearest computed pipe diameter = 12.00(In.)
Calculated individual pipe flow = 3.536(CFS)
Normal flow depth in pipe = 6.93(In.)
Flow top width inside pipe = 11.85(In.)
Critical Depth = 9.64(In.)
Pipe flow velocity = 7.52(Ft/s)
Travel time through pipe = 0.13 min.

Time of concentration (TC) = 18.28 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 119.000 to Point/Station 116.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 2
Stream flow area = 2.580(Ac.)
Runoff from this stream = 3.536(CFS)
Time of concentration = 18.28 min.

Rainfall intensity = 1.612(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 40.886 10.65 2.146
2 3.536 18.28 1.612
Largest stream flow has longer or shorter time of concentration Qp = 40.886 + sum of
Qa Tb/Ta

3.536 * 0.583 = 2.060
Qp = 42.946
Total of 2 streams to confluence:

Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Flow rates before confluence point:

40.886 3.536
Area of streams before confluence:

28.740 2.580
Results of confluence:

Total flow rate = 42.946(CFS)
Time of concentration = 10.651 min.

Effective stream area after confluence = 31.320(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 116.000 to Point/Station 120.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1520.000(Ft.)
Downstream point/station elevation = 1519.500(Ft.)
Pipe length = 54.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 42.946(CFS)
Nearest computed pipe diameter = 33.00(In.)
Calculated individual pipe flow = 42.946(CFS)
Normal flow depth in pipe = 23.25(In.)
Flow top width inside pipe = 30.11(In.)
Critical Depth = 26.12(In.)
Pipe flow velocity = 9.61(Ft/s)
Travel time through pipe = 0.09 min.

Time of concentration (TC) = 10.74 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 116.000 to Point/Station 120.000 **** CONFLUENCE OF MAIN STREAMS ****
______________________________________________________________________ The following data inside Main Stream is listed:

In Main Stream number: 1
Stream flow area = 31.320(Ac.)
Runoff from this stream = 42.946(CFS)
Time of concentration = 10.74 min.

Rainfall intensity = 2.136(In/Hr)
Program is now starting with Main Stream No. 2
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 121.000 to Point/Station 122.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 193.000(Ft.)
Top (of initial area) elevation = 1546.000(Ft.)
Bottom (of initial area) elevation = 1544.700(Ft.)
Difference in elevation = 1.300(Ft.)
Slope = 0.00674 s(percent)= 0.67
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 8.702 min.

Rainfall intensity = 2.389(In/Hr) for a 10.0 year storm SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.829
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 1.000
RI index for soil(AMC 2) = 75.00
Pervious area fraction = 0.500; Impervious fraction = 0.500 Initial subarea runoff = 1.922(CFS)
Total initial stream area = 0.970(Ac.)
Pervious area fraction = 0.500
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 122.000 to Point/Station 123.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1537.700(Ft.)
Downstream point/station elevation = 1531.700(Ft.)
Pipe length = 496.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 1.922(CFS)
Nearest computed pipe diameter = 12.00(In.)
Calculated individual pipe flow = 1.922(CFS)
Normal flow depth in pipe = 5.93(In.)
Flow top width inside pipe = 12.00(In.)
Critical Depth = 7.10(In.)
Pipe flow velocity = 4.96(Ft/s)
Travel time through pipe = 1.67 min.

Time of concentration (TC) = 10.37 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 122.000 to Point/Station 123.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 2 in normal stream number 1
Stream flow area = 0.970(Ac.)
Runoff from this stream = 1.922(CFS)
Time of concentration = 10.37 min.

Rainfall intensity = 2.177(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 124.000 to Point/Station 125.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 960.000(Ft.)
Top (of initial area) elevation = 1549.500(Ft.)
Bottom (of initial area) elevation = 1539.000(Ft.)
Difference in elevation = 10.500(Ft.)
Slope = 0.01094 s(percent)= 1.09
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 15.003 min.

Rainfall intensity = 1.790(In/Hr) for a 10.0 year storm SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.781
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.400
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.600
RI index for soil(AMC 2) = 67.40
Pervious area fraction = 0.500; Impervious fraction = 0.500 Initial subarea runoff = 6.415(CFS)
Total initial stream area = 4.590(Ac.)
Pervious area fraction = 0.500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 125.000 to Point/Station 123.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1532.000(Ft.)
Downstream point/station elevation = 1531.700(Ft.)
Pipe length = 26.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 6.415(CFS)
Nearest computed pipe diameter = 15.00(In.)
Calculated individual pipe flow = 6.415(CFS)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Normal flow depth in pipe = 11.39(In.)
Flow top width inside pipe = 12.82(In.)
Critical Depth = 12.25(In.)
Pipe flow velocity = 6.42(Ft/s)
Travel time through pipe = 0.07 min.

Time of concentration (TC) = 15.07 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 125.000 to Point/Station 123.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 2 in normal stream number 2
Stream flow area = 4.590(Ac.)
Runoff from this stream = 6.415(CFS)
Time of concentration = 15.07 min.

Rainfall intensity = 1.786(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 124.000 to Point/Station 126.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 1000.000(Ft.)
Top (of initial area) elevation = 1549.500(Ft.)
Bottom (of initial area) elevation = 1539.000(Ft.)
Difference in elevation = 10.500(Ft.)
Slope = 0.01050 s(percent)= 1.05
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 15.375 min.

Rainfall intensity = 1.767(In/Hr) for a 10.0 year storm SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.787
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.300
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.700
RI index for soil(AMC 2) = 69.30
Pervious area fraction = 0.500; Impervious fraction = 0.500 Initial subarea runoff = 6.954(CFS)
Total initial stream area = 5.000(Ac.)
Pervious area fraction = 0.500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 126.000 to Point/Station 123.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1532.000(Ft.)
Downstream point/station elevation = 1531.700(Ft.)
Pipe length = 20.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 6.954(CFS)
Nearest computed pipe diameter = 15.00(In.)
Calculated individual pipe flow = 6.954(CFS)
Normal flow depth in pipe = 10.91(In.)
Flow top width inside pipe = 13.36(In.)
Critical Depth = 12.69(In.)
Pipe flow velocity = 7.27(Ft/s)
Travel time through pipe = 0.05 min.

Time of concentration (TC) = 15.42 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 126.000 to Point/Station 123.000 **** CONFLUENCE OF MINOR STREAMS ****
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
______________________________________________________________________ Along Main Stream number: 2 in normal stream number 3
Stream flow area = 5.000(Ac.)
Runoff from this stream = 6.954(CFS)
Time of concentration = 15.42 min.

Rainfall intensity = 1.764(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 1.922 10.37 2.177
2 6.415 15.07 1.786
3 6.954 15.42 1.764
Largest stream flow has longer time of concentration
Qp = 6.954 + sum of
Qb Ia/Ib

1.922 * 0.810 = 1.557
Qb Ia/Ib

6.415 * 0.988 = 6.337
Qp = 14.848
Total of 3 streams to confluence:

Flow rates before confluence point:

1.922 6.415 6.954
Area of streams before confluence:

0.970 4.590 5.000
Results of confluence:

Total flow rate = 14.848(CFS)
Time of concentration = 15.421 min.

Effective stream area after confluence = 10.560(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 123.000 to Point/Station 120.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1531.700(Ft.)
Downstream point/station elevation = 1519.500(Ft.)
Pipe length = 800.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 14.848(CFS)
Nearest computed pipe diameter = 21.00(In.)
Calculated individual pipe flow = 14.848(CFS)
Normal flow depth in pipe = 13.69(In.)
Flow top width inside pipe = 20.01(In.)
Critical Depth = 17.14(In.)
Pipe flow velocity = 8.95(Ft/s)
Travel time through pipe = 1.49 min.

Time of concentration (TC) = 16.91 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 123.000 to Point/Station 120.000 **** CONFLUENCE OF MAIN STREAMS ****
______________________________________________________________________ The following data inside Main Stream is listed:

In Main Stream number: 2
Stream flow area = 10.560(Ac.)
Runoff from this stream = 14.848(CFS)
Time of concentration = 16.91 min.

Rainfall intensity = 1.680(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
No. (CFS) (min) (In/Hr)
1 42.946 10.74 2.136
2 14.848 16.91 1.680
Largest stream flow has longer or shorter time of concentration Qp = 42.946 + sum of
Qa Tb/Ta

14.848 * 0.635 = 9.434
Qp = 52.380
Total of 2 main streams to confluence:

Flow rates before confluence point:

42.946 14.848
Area of streams before confluence:

31.320 10.560
Results of confluence:

Total flow rate = 52.380(CFS)
Time of concentration = 10.744 min.

Effective stream area after confluence = 41.880(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 120.000 to Point/Station 128.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1519.500(Ft.)
Downstream point/station elevation = 1509.000(Ft.)
Pipe length = 1360.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 52.380(CFS)
Nearest computed pipe diameter = 36.00(In.)
Calculated individual pipe flow = 52.380(CFS)
Normal flow depth in pipe = 26.53(In.)
Flow top width inside pipe = 31.70(In.)
Critical Depth = 28.24(In.)
Pipe flow velocity = 9.37(Ft/s)
Travel time through pipe = 2.42 min.

Time of concentration (TC) = 13.16 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 120.000 to Point/Station 128.000 **** CONFLUENCE OF MAIN STREAMS ****
______________________________________________________________________ The following data inside Main Stream is listed:

In Main Stream number: 1
Stream flow area = 41.880(Ac.)
Runoff from this stream = 52.380(CFS)
Time of concentration = 13.16 min.

Rainfall intensity = 1.918(In/Hr)
Program is now starting with Main Stream No. 2
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 158.000 to Point/Station 159.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 245.000(Ft.)
Top (of initial area) elevation = 1720.000(Ft.)
Bottom (of initial area) elevation = 1659.000(Ft.)
Difference in elevation = 61.000(Ft.)
Slope = 0.24898 s(percent)= 24.90
TC = k(0.530)*[(length^3)/(elevation change)]^0.2
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Initial area time of concentration = 6.320 min.

Rainfall intensity = 2.830(In/Hr) for a 10.0 year storm UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.794
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000 Initial subarea runoff = 2.496(CFS)
Total initial stream area = 1.110(Ac.)
Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 158.000 to Point/Station 159.000 **** SUBAREA FLOW ADDITION ****
______________________________________________________________________ COMMERCIAL subarea type
Runoff Coefficient = 0.876
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 2) = 56.00
Pervious area fraction = 0.100; Impervious fraction = 0.900 Time of concentration = 6.32 min.

Rainfall intensity = 2.830(In/Hr) for a 10.0 year storm Subarea runoff = 1.016(CFS) for 0.410(Ac.)
Total runoff = 3.512(CFS) Total area = 1.520(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 158.000 to Point/Station 159.000 **** SUBAREA FLOW ADDITION ****
______________________________________________________________________ COMMERCIAL subarea type
Runoff Coefficient = 0.876
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 2) = 56.00
Pervious area fraction = 0.100; Impervious fraction = 0.900 Time of concentration = 6.32 min.

Rainfall intensity = 2.830(In/Hr) for a 10.0 year storm Subarea runoff = 1.760(CFS) for 0.710(Ac.)
Total runoff = 5.271(CFS) Total area = 2.230(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 160.000 to Point/Station 161.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1650.000(Ft.)
Downstream point/station elevation = 1512.000(Ft.)
Pipe length = 965.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 5.271(CFS)
Nearest computed pipe diameter = 9.00(In.)
Calculated individual pipe flow = 5.271(CFS)
Normal flow depth in pipe = 6.33(In.)
Flow top width inside pipe = 8.22(In.)
Critical depth could not be calculated.

Pipe flow velocity = 15.87(Ft/s)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Travel time through pipe = 1.01 min.

Time of concentration (TC) = 7.33 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 160.000 to Point/Station 161.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 2 in normal stream number 1
Stream flow area = 2.230(Ac.)
Runoff from this stream = 5.271(CFS)
Time of concentration = 7.33 min.

Rainfall intensity = 2.616(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 162.000 to Point/Station 163.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 945.000(Ft.)
Top (of initial area) elevation = 1717.700(Ft.)
Bottom (of initial area) elevation = 1520.000(Ft.)
Difference in elevation = 197.700(Ft.)
Slope = 0.20921 s(percent)= 20.92
TC = k(0.530)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 11.229 min.

Rainfall intensity = 2.087(In/Hr) for a 10.0 year storm UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.779
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.700
Decimal fraction soil group C = 0.300
Decimal fraction soil group D = 0.000
RI index for soil(AMC 2) = 80.40
Pervious area fraction = 1.000; Impervious fraction = 0.000 Initial subarea runoff = 7.541(CFS)
Total initial stream area = 4.640(Ac.)
Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 163.000 to Point/Station 161.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1513.000(Ft.)
Downstream point/station elevation = 1512.000(Ft.)
Pipe length = 23.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 7.541(CFS)
Nearest computed pipe diameter = 15.00(In.)
Calculated individual pipe flow = 7.541(CFS)
Normal flow depth in pipe = 8.03(In.)
Flow top width inside pipe = 14.96(In.)
Critical Depth = 13.09(In.)
Pipe flow velocity = 11.29(Ft/s)
Travel time through pipe = 0.03 min.

Time of concentration (TC) = 11.26 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 163.000 to Point/Station 161.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 2 in normal stream number 2
Stream flow area = 4.640(Ac.)
Runoff from this stream = 7.541(CFS)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Time of concentration = 11.26 min.

Rainfall intensity = 2.084(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 5.271 7.33 2.616
2 7.541 11.26 2.084
Largest stream flow has longer time of concentration
Qp = 7.541 + sum of
Qb Ia/Ib

5.271 * 0.797 = 4.199
Qp = 11.740
Total of 2 streams to confluence:

Flow rates before confluence point:

5.271 7.541
Area of streams before confluence:

2.230 4.640
Results of confluence:

Total flow rate = 11.740(CFS)
Time of concentration = 11.263 min.

Effective stream area after confluence = 6.870(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 163.000 to Point/Station 161.000 **** SUBAREA FLOW ADDITION ****
______________________________________________________________________ UNDEVELOPED (fair cover) subarea
Runoff Coefficient = 0.769
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 1.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 2) = 79.00
Pervious area fraction = 1.000; Impervious fraction = 0.000 Time of concentration = 11.26 min.

Rainfall intensity = 2.084(In/Hr) for a 10.0 year storm Subarea runoff = 0.962(CFS) for 0.600(Ac.)
Total runoff = 12.701(CFS) Total area = 7.470(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 161.000 to Point/Station 128.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1512.000(Ft.)
Downstream point/station elevation = 1509.000(Ft.)
Pipe length = 567.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 12.701(CFS)
Nearest computed pipe diameter = 24.00(In.)
Calculated individual pipe flow = 12.701(CFS)
Normal flow depth in pipe = 15.82(In.)
Flow top width inside pipe = 22.75(In.)
Critical Depth = 15.38(In.)
Pipe flow velocity = 5.78(Ft/s)
Travel time through pipe = 1.63 min.

Time of concentration (TC) = 12.90 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 161.000 to Point/Station 128.000 Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
**** CONFLUENCE OF MAIN STREAMS ****
______________________________________________________________________ The following data inside Main Stream is listed:

In Main Stream number: 2
Stream flow area = 7.470(Ac.)
Runoff from this stream = 12.701(CFS)
Time of concentration = 12.90 min.

Rainfall intensity = 1.939(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 52.380 13.16 1.918
2 12.701 12.90 1.939
Largest stream flow has longer time of concentration
Qp = 52.380 + sum of
Qb Ia/Ib

12.701 * 0.989 = 12.565
Qp = 64.945
Total of 2 main streams to confluence:

Flow rates before confluence point:

52.380 12.701
Area of streams before confluence:

41.880 7.470
Results of confluence:

Total flow rate = 64.945(CFS)
Time of concentration = 13.163 min.

Effective stream area after confluence = 49.350(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 128.000 to Point/Station 129.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1509.000(Ft.)
Downstream point/station elevation = 1499.100(Ft.)
Pipe length = 333.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 64.945(CFS)
Nearest computed pipe diameter = 30.00(In.)
Calculated individual pipe flow = 64.945(CFS)
Normal flow depth in pipe = 22.64(In.)
Flow top width inside pipe = 25.82(In.)
Critical depth could not be calculated.

Pipe flow velocity = 16.34(Ft/s)
Travel time through pipe = 0.34 min.

Time of concentration (TC) = 13.50 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 128.000 to Point/Station 129.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 1
Stream flow area = 49.350(Ac.)
Runoff from this stream = 64.945(CFS)
Time of concentration = 13.50 min.

Rainfall intensity = 1.893(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Process from Point/Station 130.000 to Point/Station 131.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 994.000(Ft.)
Top (of initial area) elevation = 1521.000(Ft.)
Bottom (of initial area) elevation = 1508.600(Ft.)
Difference in elevation = 12.400(Ft.)
Slope = 0.01247 s(percent)= 1.25
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 14.819 min.

Rainfall intensity = 1.802(In/Hr) for a 10.0 year storm SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.758
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.700
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.300
RI index for soil(AMC 2) = 61.70
Pervious area fraction = 0.500; Impervious fraction = 0.500 Initial subarea runoff = 3.197(CFS)
Total initial stream area = 2.340(Ac.)
Pervious area fraction = 0.500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 131.000 to Point/Station 129.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1499.400(Ft.)
Downstream point/station elevation = 1499.100(Ft.)
Pipe length = 22.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 3.197(CFS)
Nearest computed pipe diameter = 12.00(In.)
Calculated individual pipe flow = 3.197(CFS)
Normal flow depth in pipe = 7.89(In.)
Flow top width inside pipe = 11.39(In.)
Critical Depth = 9.20(In.)
Pipe flow velocity = 5.84(Ft/s)
Travel time through pipe = 0.06 min.

Time of concentration (TC) = 14.88 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 131.000 to Point/Station 129.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 2
Stream flow area = 2.340(Ac.)
Runoff from this stream = 3.197(CFS)
Time of concentration = 14.88 min.

Rainfall intensity = 1.798(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 132.000 to Point/Station 133.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 636.000(Ft.)
Top (of initial area) elevation = 1526.500(Ft.)
Bottom (of initial area) elevation = 1519.100(Ft.)
Difference in elevation = 7.400(Ft.)
Slope = 0.01164 s(percent)= 1.16
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 12.569 min.

Rainfall intensity = 1.966(In/Hr) for a 10.0 year storm Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.817
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 1.000
RI index for soil(AMC 2) = 75.00
Pervious area fraction = 0.500; Impervious fraction = 0.500 Initial subarea runoff = 2.184(CFS)
Total initial stream area = 1.360(Ac.)
Pervious area fraction = 0.500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 133.000 to Point/Station 134.000 **** STREET FLOW TRAVEL TIME + SUBAREA FLOW ADDITION **** ______________________________________________________________________ Top of street segment elevation = 1519.100(Ft.)
End of street segment elevation = 1510.100(Ft.)
Length of street segment = 806.000(Ft.)
Height of curb above gutter flowline = 6.0(In.)
Width of half street (curb to crown) = 18.000(Ft.)
Distance from crown to crossfall grade break = 16.000(Ft.) Slope from gutter to grade break (v/hz) = 0.020
Slope from grade break to crown (v/hz) = 0.020
Street flow is on [1] side(s) of the street
Distance from curb to property line = 10.000(Ft.)
Slope from curb to property line (v/hz) = 0.020
Gutter width = 2.000(Ft.)
Gutter hike from flowline = 2.000(In.)
Manning's N in gutter = 0.0130
Manning's N from gutter to grade break = 0.0130
Manning's N from grade break to crown = 0.0130
Estimated mean flow rate at midpoint of street = 6.590(CFS) Depth of flow = 0.401(Ft.), Average velocity = 3.288(Ft/s) Streetflow hydraulics at midpoint of street travel:

Halfstreet flow width = 13.703(Ft.)
Flow velocity = 3.29(Ft/s)
Travel time = 4.09 min. TC = 16.65 min.

Adding area flow to street
SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.768
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.500
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.500
RI index for soil(AMC 2) = 65.50
Pervious area fraction = 0.500; Impervious fraction = 0.500 Rainfall intensity = 1.693(In/Hr) for a 10.0 year storm Subarea runoff = 8.741(CFS) for 6.720(Ac.)
Total runoff = 10.925(CFS) Total area = 8.080(Ac.) Street flow at end of street = 10.925(CFS)
Half street flow at end of street = 10.925(CFS)
Depth of flow = 0.462(Ft.), Average velocity = 3.714(Ft/s) Flow width (from curb towards crown)= 16.777(Ft.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 134.000 to Point/Station 129.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1499.400(Ft.)
Downstream point/station elevation = 1499.100(Ft.)
Pipe length = 25.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 10.925(CFS)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Nearest computed pipe diameter = 18.00(In.)
Calculated individual pipe flow = 10.925(CFS)
Normal flow depth in pipe = 13.99(In.)
Flow top width inside pipe = 14.98(In.)
Critical Depth = 15.20(In.)
Pipe flow velocity = 7.41(Ft/s)
Travel time through pipe = 0.06 min.

Time of concentration (TC) = 16.71 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 134.000 to Point/Station 129.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 3
Stream flow area = 8.080(Ac.)
Runoff from this stream = 10.925(CFS)
Time of concentration = 16.71 min.

Rainfall intensity = 1.690(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 64.945 13.50 1.893
2 3.197 14.88 1.798
3 10.925 16.71 1.690
Largest stream flow has longer or shorter time of concentration Qp = 64.945 + sum of
Qa Tb/Ta

3.197 * 0.907 = 2.901
Qa Tb/Ta

10.925 * 0.808 = 8.828
Qp = 76.674
Total of 3 streams to confluence:

Flow rates before confluence point:

64.945 3.197 10.925
Area of streams before confluence:

49.350 2.340 8.080
Results of confluence:

Total flow rate = 76.674(CFS)
Time of concentration = 13.502 min.

Effective stream area after confluence = 59.770(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 129.000 to Point/Station 135.100 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1499.100(Ft.)
Downstream point/station elevation = 1498.000(Ft.)
Pipe length = 107.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 76.674(CFS)
Nearest computed pipe diameter = 39.00(In.)
Calculated individual pipe flow = 76.674(CFS)
Normal flow depth in pipe = 29.34(In.)
Flow top width inside pipe = 33.67(In.)
Critical Depth = 33.12(In.)
Pipe flow velocity = 11.44(Ft/s)
Travel time through pipe = 0.16 min.

Time of concentration (TC) = 13.66 min.

Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 129.000 to Point/Station 135.100 **** CONFLUENCE OF MAIN STREAMS ****
______________________________________________________________________ The following data inside Main Stream is listed:

In Main Stream number: 1
Stream flow area = 59.770(Ac.)
Runoff from this stream = 76.674(CFS)
Time of concentration = 13.66 min.

Rainfall intensity = 1.881(In/Hr)
Program is now starting with Main Stream No. 2
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 136.000 to Point/Station 137.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 616.000(Ft.)
Top (of initial area) elevation = 1515.100(Ft.)
Bottom (of initial area) elevation = 1506.700(Ft.)
Difference in elevation = 8.400(Ft.)
Slope = 0.01364 s(percent)= 1.36
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 12.021 min.

Rainfall intensity = 2.013(In/Hr) for a 10.0 year storm SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.637
Decimal fraction soil group A = 1.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 2) = 32.00
Pervious area fraction = 0.500; Impervious fraction = 0.500 Initial subarea runoff = 2.295(CFS)
Total initial stream area = 1.790(Ac.)
Pervious area fraction = 0.500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 137.000 to Point/Station 138.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1498.900(Ft.)
Downstream point/station elevation = 1498.400(Ft.)
Pipe length = 47.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 2.295(CFS)
Nearest computed pipe diameter = 12.00(In.)
Calculated individual pipe flow = 2.295(CFS)
Normal flow depth in pipe = 6.87(In.)
Flow top width inside pipe = 11.87(In.)
Critical Depth = 7.77(In.)
Pipe flow velocity = 4.94(Ft/s)
Travel time through pipe = 0.16 min.

Time of concentration (TC) = 12.18 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 137.000 to Point/Station 138.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 2 in normal stream number 1
Stream flow area = 1.790(Ac.)
Runoff from this stream = 2.295(CFS)
Time of concentration = 12.18 min.

Rainfall intensity = 1.999(In/Hr)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 139.000 to Point/Station 140.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 701.000(Ft.)
Top (of initial area) elevation = 1512.200(Ft.)
Bottom (of initial area) elevation = 1506.700(Ft.)
Difference in elevation = 5.500(Ft.)
Slope = 0.00785 s(percent)= 0.78
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 14.139 min.

Rainfall intensity = 1.847(In/Hr) for a 10.0 year storm SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.737
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 2) = 56.00
Pervious area fraction = 0.500; Impervious fraction = 0.500 Initial subarea runoff = 3.213(CFS)
Total initial stream area = 2.360(Ac.)
Pervious area fraction = 0.500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 140.000 to Point/Station 138.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1498.600(Ft.)
Downstream point/station elevation = 1498.400(Ft.)
Pipe length = 10.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 3.213(CFS)
Nearest computed pipe diameter = 12.00(In.)
Calculated individual pipe flow = 3.213(CFS)
Normal flow depth in pipe = 6.96(In.)
Flow top width inside pipe = 11.85(In.)
Critical Depth = 9.22(In.)
Pipe flow velocity = 6.80(Ft/s)
Travel time through pipe = 0.02 min.

Time of concentration (TC) = 14.16 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 140.000 to Point/Station 138.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 2 in normal stream number 2
Stream flow area = 2.360(Ac.)
Runoff from this stream = 3.213(CFS)
Time of concentration = 14.16 min.

Rainfall intensity = 1.845(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 2.295 12.18 1.999
2 3.213 14.16 1.845
Largest stream flow has longer time of concentration
Qp = 3.213 + sum of
Qb Ia/Ib
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3

2.295 * 0.923 = 2.118
Qp = 5.332
Total of 2 streams to confluence:

Flow rates before confluence point:

2.295 3.213
Area of streams before confluence:

1.790 2.360
Results of confluence:

Total flow rate = 5.332(CFS)
Time of concentration = 14.164 min.

Effective stream area after confluence = 4.150(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 138.000 to Point/Station 135.200 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1498.400(Ft.)
Downstream point/station elevation = 1498.000(Ft.)
Pipe length = 40.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 5.332(CFS)
Nearest computed pipe diameter = 15.00(In.)
Calculated individual pipe flow = 5.332(CFS)
Normal flow depth in pipe = 10.38(In.)
Flow top width inside pipe = 13.85(In.)
Critical Depth = 11.24(In.)
Pipe flow velocity = 5.88(Ft/s)
Travel time through pipe = 0.11 min.

Time of concentration (TC) = 14.28 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 138.000 to Point/Station 135.200 **** CONFLUENCE OF MAIN STREAMS ****
______________________________________________________________________ The following data inside Main Stream is listed:

In Main Stream number: 2
Stream flow area = 4.150(Ac.)
Runoff from this stream = 5.332(CFS)
Time of concentration = 14.28 min.

Rainfall intensity = 1.838(In/Hr)
Program is now starting with Main Stream No. 3
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 146.000 to Point/Station 147.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 1000.000(Ft.)
Top (of initial area) elevation = 1744.000(Ft.)
Bottom (of initial area) elevation = 1579.000(Ft.)
Difference in elevation = 165.000(Ft.)
Slope = 0.16500 s(percent)= 16.50
TC = k(0.530)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 12.044 min.

Rainfall intensity = 2.011(In/Hr) for a 10.0 year storm UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.758
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000 Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Initial subarea runoff = 6.510(CFS)
Total initial stream area = 4.270(Ac.)
Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 147.000 to Point/Station 148.000 **** IMPROVED CHANNEL TRAVEL TIME ****
______________________________________________________________________ Upstream point elevation = 1579.000(Ft.)
Downstream point elevation = 1568.000(Ft.)
Channel length thru subarea = 185.000(Ft.)
Channel base width = 0.000(Ft.)
Slope or 'Z' of left channel bank = 1.000
Slope or 'Z' of right channel bank = 1.000
Estimated mean flow rate at midpoint of channel = 7.061(CFS) Manning's 'N' = 0.013
Maximum depth of channel = 1.500(Ft.)
Flow(q) thru subarea = 7.061(CFS)
Depth of flow = 0.775(Ft.), Average velocity = 11.758(Ft/s) Channel flow top width = 1.550(Ft.)
Flow Velocity = 11.76(Ft/s)
Travel time = 0.26 min.

Time of concentration = 12.31 min.

Sub-Channel No. 1 Critical depth = 1.250(Ft.)
' ' ' Critical flow top width = 2.500(Ft.) ' ' ' Critical flow velocity= 4.519(Ft/s) ' ' ' Critical flow area = 1.563(Sq.Ft) Adding area flow to channel
UNDEVELOPED (fair cover) subarea
Runoff Coefficient = 0.692
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 2) = 69.00
Pervious area fraction = 1.000; Impervious fraction = 0.000 Rainfall intensity = 1.988(In/Hr) for a 10.0 year storm Subarea runoff = 1.045(CFS) for 0.760(Ac.)
Total runoff = 7.555(CFS) Total area = 5.030(Ac.) Depth of flow = 0.795(Ft.), Average velocity = 11.958(Ft/s) Sub-Channel No. 1 Critical depth = 1.289(Ft.)
' ' ' Critical flow top width = 2.578(Ft.) ' ' ' Critical flow velocity= 4.547(Ft/s) ' ' ' Critical flow area = 1.662(Sq.Ft) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 147.000 to Point/Station 148.000 **** SUBAREA FLOW ADDITION ****
______________________________________________________________________ UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.757
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000 Time of concentration = 12.31 min.

Rainfall intensity = 1.988(In/Hr) for a 10.0 year storm Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Subarea runoff = 3.611(CFS) for 2.400(Ac.)
Total runoff = 11.166(CFS) Total area = 7.430(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 148.000 to Point/Station 149.000 **** IMPROVED CHANNEL TRAVEL TIME ****
______________________________________________________________________ Upstream point elevation = 1568.000(Ft.)
Downstream point elevation = 1560.000(Ft.)
Channel length thru subarea = 220.000(Ft.)
Channel base width = 0.000(Ft.)
Slope or 'Z' of left channel bank = 1.000
Slope or 'Z' of right channel bank = 1.000
Estimated mean flow rate at midpoint of channel = 11.467(CFS) Manning's 'N' = 0.013
Maximum depth of channel = 1.500(Ft.)
Flow(q) thru subarea = 11.467(CFS)
Depth of flow = 1.019(Ft.), Average velocity = 11.038(Ft/s) Channel flow top width = 2.038(Ft.)
Flow Velocity = 11.04(Ft/s)
Travel time = 0.33 min.

Time of concentration = 12.64 min.

Sub-Channel No. 1 Critical depth = 1.516(Ft.)
' ' ' Critical flow top width = 3.000(Ft.) ' ' ' Critical flow velocity= 4.992(Ft/s) ' ' ' Critical flow area = 2.297(Sq.Ft) Adding area flow to channel
UNDEVELOPED (fair cover) subarea
Runoff Coefficient = 0.689
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 2) = 69.00
Pervious area fraction = 1.000; Impervious fraction = 0.000 Rainfall intensity = 1.960(In/Hr) for a 10.0 year storm Subarea runoff = 0.540(CFS) for 0.400(Ac.)
Total runoff = 11.707(CFS) Total area = 7.830(Ac.) Depth of flow = 1.027(Ft.), Average velocity = 11.095(Ft/s) Sub-Channel No. 1 Critical depth = 1.531(Ft.)
' ' ' Critical flow top width = 3.000(Ft.) ' ' ' Critical flow velocity= 4.995(Ft/s) ' ' ' Critical flow area = 2.344(Sq.Ft) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 149.000 to Point/Station 150.000 **** IMPROVED CHANNEL TRAVEL TIME ****
______________________________________________________________________ Upstream point elevation = 1560.000(Ft.)
Downstream point elevation = 1555.000(Ft.)
Channel length thru subarea = 190.000(Ft.)
Channel base width = 0.000(Ft.)
Slope or 'Z' of left channel bank = 1.000
Slope or 'Z' of right channel bank = 1.000
Estimated mean flow rate at midpoint of channel = 12.420(CFS) Manning's 'N' = 0.013
Maximum depth of channel = 1.500(Ft.)
Flow(q) thru subarea = 12.420(CFS)
Depth of flow = 1.116(Ft.), Average velocity = 9.975(Ft/s) Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Channel flow top width = 2.232(Ft.)
Flow Velocity = 9.97(Ft/s)
Travel time = 0.32 min.

Time of concentration = 12.96 min.

Sub-Channel No. 1 Critical depth = 1.563(Ft.)
' ' ' Critical flow top width = 3.000(Ft.) ' ' ' Critical flow velocity= 5.095(Ft/s) ' ' ' Critical flow area = 2.438(Sq.Ft) Adding area flow to channel
UNDEVELOPED (fair cover) subarea
Runoff Coefficient = 0.687
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 2) = 69.00
Pervious area fraction = 1.000; Impervious fraction = 0.000 Rainfall intensity = 1.935(In/Hr) for a 10.0 year storm Subarea runoff = 1.343(CFS) for 1.010(Ac.)
Total runoff = 13.049(CFS) Total area = 8.840(Ac.) Depth of flow = 1.137(Ft.), Average velocity = 10.099(Ft/s) Sub-Channel No. 1 Critical depth = 1.586(Ft.)
' ' ' Critical flow top width = 3.000(Ft.) ' ' ' Critical flow velocity= 5.203(Ft/s) ' ' ' Critical flow area = 2.508(Sq.Ft) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 149.000 to Point/Station 150.000 **** SUBAREA FLOW ADDITION ****
______________________________________________________________________ UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.754
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000 Time of concentration = 12.96 min.

Rainfall intensity = 1.935(In/Hr) for a 10.0 year storm Subarea runoff = 4.956(CFS) for 3.400(Ac.)
Total runoff = 18.005(CFS) Total area = 12.240(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 150.000 to Point/Station 151.000 **** IMPROVED CHANNEL TRAVEL TIME ****
______________________________________________________________________ Upstream point elevation = 1555.000(Ft.)
Downstream point elevation = 1536.000(Ft.)
Channel length thru subarea = 330.000(Ft.)
Channel base width = 0.000(Ft.)
Slope or 'Z' of left channel bank = 1.000
Slope or 'Z' of right channel bank = 1.000
Estimated mean flow rate at midpoint of channel = 18.373(CFS) Manning's 'N' = 0.013
Maximum depth of channel = 1.500(Ft.)
Flow(q) thru subarea = 18.373(CFS)
Depth of flow = 1.116(Ft.), Average velocity = 14.754(Ft/s) Channel flow top width = 2.232(Ft.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Flow Velocity = 14.75(Ft/s)
Travel time = 0.37 min.

Time of concentration = 13.33 min.

Sub-Channel No. 1 Critical depth = 1.797(Ft.)
' ' ' Critical flow top width = 3.000(Ft.) ' ' ' Critical flow velocity= 5.850(Ft/s) ' ' ' Critical flow area = 3.141(Sq.Ft) Adding area flow to channel
UNDEVELOPED (fair cover) subarea
Runoff Coefficient = 0.685
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 2) = 69.00
Pervious area fraction = 1.000; Impervious fraction = 0.000 Rainfall intensity = 1.906(In/Hr) for a 10.0 year storm Subarea runoff = 0.652(CFS) for 0.500(Ac.)
Total runoff = 18.658(CFS) Total area = 12.740(Ac.) Depth of flow = 1.122(Ft.), Average velocity = 14.811(Ft/s) Sub-Channel No. 1 Critical depth = 1.813(Ft.)
' ' ' Critical flow top width = 3.000(Ft.) ' ' ' Critical flow velocity= 5.853(Ft/s) ' ' ' Critical flow area = 3.188(Sq.Ft) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 151.000 to Point/Station 152.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1534.000(Ft.)
Downstream point/station elevation = 1533.000(Ft.)
Pipe length = 104.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 18.658(CFS)
Nearest computed pipe diameter = 24.00(In.)
Calculated individual pipe flow = 18.658(CFS)
Normal flow depth in pipe = 16.85(In.)
Flow top width inside pipe = 21.95(In.)
Critical Depth = 18.66(In.)
Pipe flow velocity = 7.91(Ft/s)
Travel time through pipe = 0.22 min.

Time of concentration (TC) = 13.55 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 151.000 to Point/Station 152.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 3 in normal stream number 1
Stream flow area = 12.740(Ac.)
Runoff from this stream = 18.658(CFS)
Time of concentration = 13.55 min.

Rainfall intensity = 1.889(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 153.000 to Point/Station 152.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 727.000(Ft.)
Top (of initial area) elevation = 1707.000(Ft.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Bottom (of initial area) elevation = 1537.000(Ft.)
Difference in elevation = 170.000(Ft.)
Slope = 0.23384 s(percent)= 23.38
TC = k(0.530)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 9.888 min.

Rainfall intensity = 2.232(In/Hr) for a 10.0 year storm UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.805
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.500
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.500
RI index for soil(AMC 2) = 83.50
Pervious area fraction = 1.000; Impervious fraction = 0.000 Initial subarea runoff = 6.110(CFS)
Total initial stream area = 3.400(Ac.)
Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 153.000 to Point/Station 152.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 3 in normal stream number 2
Stream flow area = 3.400(Ac.)
Runoff from this stream = 6.110(CFS)
Time of concentration = 9.89 min.

Rainfall intensity = 2.232(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 18.658 13.55 1.889
2 6.110 9.89 2.232
Largest stream flow has longer time of concentration
Qp = 18.658 + sum of
Qb Ia/Ib

6.110 * 0.846 = 5.171
Qp = 23.829
Total of 2 streams to confluence:

Flow rates before confluence point:

18.658 6.110
Area of streams before confluence:

12.740 3.400
Results of confluence:

Total flow rate = 23.829(CFS)
Time of concentration = 13.548 min.

Effective stream area after confluence = 16.140(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 152.000 to Point/Station 154.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1533.000(Ft.)
Downstream point/station elevation = 1519.500(Ft.)
Pipe length = 440.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 23.829(CFS)
Nearest computed pipe diameter = 21.00(In.)
Calculated individual pipe flow = 23.829(CFS)
Normal flow depth in pipe = 15.00(In.)
Flow top width inside pipe = 18.97(In.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Critical depth could not be calculated.

Pipe flow velocity = 12.97(Ft/s)
Travel time through pipe = 0.57 min.

Time of concentration (TC) = 14.11 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 152.000 to Point/Station 154.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 3 in normal stream number 1
Stream flow area = 16.140(Ac.)
Runoff from this stream = 23.829(CFS)
Time of concentration = 14.11 min.

Rainfall intensity = 1.849(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 155.000 to Point/Station 156.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 320.000(Ft.)
Top (of initial area) elevation = 1575.000(Ft.)
Bottom (of initial area) elevation = 1528.000(Ft.)
Difference in elevation = 47.000(Ft.)
Slope = 0.14688 s(percent)= 14.69
TC = k(0.710)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 10.470 min.

Rainfall intensity = 2.166(In/Hr) for a 10.0 year storm UNDEVELOPED (fair cover) subarea
Runoff Coefficient = 0.806
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 1.000
RI index for soil(AMC 2) = 84.00
Pervious area fraction = 1.000; Impervious fraction = 0.000 Initial subarea runoff = 0.960(CFS)
Total initial stream area = 0.550(Ac.)
Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 156.000 to Point/Station 154.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1528.000(Ft.)
Downstream point/station elevation = 1519.500(Ft.)
Pipe length = 36.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 0.960(CFS)
Nearest computed pipe diameter = 6.00(In.)
Calculated individual pipe flow = 0.960(CFS)
Normal flow depth in pipe = 2.46(In.)
Flow top width inside pipe = 5.90(In.)
Critical Depth = 5.62(In.)
Pipe flow velocity = 12.67(Ft/s)
Travel time through pipe = 0.05 min.

Time of concentration (TC) = 10.52 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 156.000 to Point/Station 154.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 3 in normal stream number 2
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Stream flow area = 0.550(Ac.)
Runoff from this stream = 0.960(CFS)
Time of concentration = 10.52 min.

Rainfall intensity = 2.161(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 23.829 14.11 1.849
2 0.960 10.52 2.161
Largest stream flow has longer time of concentration
Qp = 23.829 + sum of
Qb Ia/Ib

0.960 * 0.856 = 0.821
Qp = 24.650
Total of 2 streams to confluence:

Flow rates before confluence point:

23.829 0.960
Area of streams before confluence:

16.140 0.550
Results of confluence:

Total flow rate = 24.650(CFS)
Time of concentration = 14.113 min.

Effective stream area after confluence = 16.690(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 154.000 to Point/Station 157.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1519.500(Ft.)
Downstream point/station elevation = 1509.800(Ft.)
Pipe length = 660.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 24.650(CFS)
Nearest computed pipe diameter = 24.00(In.)
Calculated individual pipe flow = 24.650(CFS)
Normal flow depth in pipe = 17.77(In.)
Flow top width inside pipe = 21.05(In.)
Critical Depth = 21.02(In.)
Pipe flow velocity = 9.88(Ft/s)
Travel time through pipe = 1.11 min.

Time of concentration (TC) = 15.23 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 154.000 to Point/Station 157.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 3 in normal stream number 1
Stream flow area = 16.690(Ac.)
Runoff from this stream = 24.650(CFS)
Time of concentration = 15.23 min.

Rainfall intensity = 1.776(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 158.000 to Point/Station 159.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 442.000(Ft.)
Top (of initial area) elevation = 1640.000(Ft.)
Bottom (of initial area) elevation = 1535.000(Ft.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Difference in elevation = 105.000(Ft.)
Slope = 0.23756 s(percent)= 23.76
TC = k(0.530)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 8.078 min.

Rainfall intensity = 2.485(In/Hr) for a 10.0 year storm UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.828
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 1.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 2) = 86.00
Pervious area fraction = 1.000; Impervious fraction = 0.000 Initial subarea runoff = 4.217(CFS)
Total initial stream area = 2.050(Ac.)
Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 159.000 to Point/Station 157.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1533.000(Ft.)
Downstream point/station elevation = 1509.800(Ft.)
Pipe length = 65.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 4.217(CFS)
Nearest computed pipe diameter = 9.00(In.)
Calculated individual pipe flow = 4.217(CFS)
Normal flow depth in pipe = 4.11(In.)
Flow top width inside pipe = 8.97(In.)
Critical depth could not be calculated.

Pipe flow velocity = 21.49(Ft/s)
Travel time through pipe = 0.05 min.

Time of concentration (TC) = 8.13 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 159.000 to Point/Station 157.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 3 in normal stream number 2
Stream flow area = 2.050(Ac.)
Runoff from this stream = 4.217(CFS)
Time of concentration = 8.13 min.

Rainfall intensity = 2.477(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 24.650 15.23 1.776
2 4.217 8.13 2.477
Largest stream flow has longer time of concentration
Qp = 24.650 + sum of
Qb Ia/Ib

4.217 * 0.717 = 3.023
Qp = 27.673
Total of 2 streams to confluence:

Flow rates before confluence point:

24.650 4.217
Area of streams before confluence:

16.690 2.050
Results of confluence:

Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Total flow rate = 27.673(CFS)
Time of concentration = 15.227 min.

Effective stream area after confluence = 18.740(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 157.000 to Point/Station 160.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1509.800(Ft.)
Downstream point/station elevation = 1503.800(Ft.)
Pipe length = 307.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 27.673(CFS)
Nearest computed pipe diameter = 24.00(In.)
Calculated individual pipe flow = 27.673(CFS)
Normal flow depth in pipe = 17.39(In.)
Flow top width inside pipe = 21.44(In.)
Critical Depth = 21.86(In.)
Pipe flow velocity = 11.35(Ft/s)
Travel time through pipe = 0.45 min.

Time of concentration (TC) = 15.68 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 157.000 to Point/Station 160.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 3 in normal stream number 1
Stream flow area = 18.740(Ac.)
Runoff from this stream = 27.673(CFS)
Time of concentration = 15.68 min.

Rainfall intensity = 1.749(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 161.000 to Point/Station 162.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 570.000(Ft.)
Top (of initial area) elevation = 1630.000(Ft.)
Bottom (of initial area) elevation = 1535.000(Ft.)
Difference in elevation = 95.000(Ft.)
Slope = 0.16667 s(percent)= 16.67
TC = k(0.530)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 9.600 min.

Rainfall intensity = 2.268(In/Hr) for a 10.0 year storm UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.806
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.500
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.500
RI index for soil(AMC 2) = 83.50
Pervious area fraction = 1.000; Impervious fraction = 0.000 Initial subarea runoff = 3.035(CFS)
Total initial stream area = 1.660(Ac.)
Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 162.000 to Point/Station 160.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1533.000(Ft.)
Downstream point/station elevation = 1503.800(Ft.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Pipe length = 72.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 3.035(CFS)
Nearest computed pipe diameter = 6.00(In.)
Calculated individual pipe flow = 3.035(CFS)
Normal flow depth in pipe = 4.25(In.)
Flow top width inside pipe = 5.46(In.)
Critical depth could not be calculated.

Pipe flow velocity = 20.43(Ft/s)
Travel time through pipe = 0.06 min.

Time of concentration (TC) = 9.66 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 162.000 to Point/Station 160.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 3 in normal stream number 2
Stream flow area = 1.660(Ac.)
Runoff from this stream = 3.035(CFS)
Time of concentration = 9.66 min.

Rainfall intensity = 2.260(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 27.673 15.68 1.749
2 3.035 9.66 2.260
Largest stream flow has longer time of concentration
Qp = 27.673 + sum of
Qb Ia/Ib

3.035 * 0.774 = 2.348
Qp = 30.021
Total of 2 streams to confluence:

Flow rates before confluence point:

27.673 3.035
Area of streams before confluence:

18.740 1.660
Results of confluence:

Total flow rate = 30.021(CFS)
Time of concentration = 15.678 min.

Effective stream area after confluence = 20.400(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 160.000 to Point/Station 135.200 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1503.800(Ft.)
Downstream point/station elevation = 1498.000(Ft.)
Pipe length = 256.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 30.021(CFS)
Nearest computed pipe diameter = 24.00(In.)
Calculated individual pipe flow = 30.021(CFS)
Normal flow depth in pipe = 17.51(In.)
Flow top width inside pipe = 21.32(In.)
Critical Depth = 22.35(In.)
Pipe flow velocity = 12.23(Ft/s)
Travel time through pipe = 0.35 min.

Time of concentration (TC) = 16.03 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Process from Point/Station 160.000 to Point/Station 135.200 **** CONFLUENCE OF MAIN STREAMS ****
______________________________________________________________________ The following data inside Main Stream is listed:

In Main Stream number: 3
Stream flow area = 20.400(Ac.)
Runoff from this stream = 30.021(CFS)
Time of concentration = 16.03 min.

Rainfall intensity = 1.728(In/Hr)
Program is now starting with Main Stream No. 4
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 128.000 to Point/Station 140.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 580.000(Ft.)
Top (of initial area) elevation = 1529.800(Ft.)
Bottom (of initial area) elevation = 1523.300(Ft.)
Difference in elevation = 6.500(Ft.)
Slope = 0.01121 s(percent)= 1.12
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 12.205 min.

Rainfall intensity = 1.997(In/Hr) for a 10.0 year storm SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.818
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 1.000
RI index for soil(AMC 2) = 75.00
Pervious area fraction = 0.500; Impervious fraction = 0.500 Initial subarea runoff = 2.124(CFS)
Total initial stream area = 1.300(Ac.)
Pervious area fraction = 0.500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 140.000 to Point/Station 141.000 **** STREET FLOW TRAVEL TIME + SUBAREA FLOW ADDITION **** ______________________________________________________________________ Top of street segment elevation = 1523.300(Ft.)
End of street segment elevation = 1504.000(Ft.)
Length of street segment = 1420.000(Ft.)
Height of curb above gutter flowline = 8.0(In.)
Width of half street (curb to crown) = 38.000(Ft.)
Distance from crown to crossfall grade break = 20.000(Ft.) Slope from gutter to grade break (v/hz) = 0.020
Slope from grade break to crown (v/hz) = 0.020
Street flow is on [1] side(s) of the street
Distance from curb to property line = 40.000(Ft.)
Slope from curb to property line (v/hz) = 0.020
Gutter width = 2.000(Ft.)
Gutter hike from flowline = 2.000(In.)
Manning's N in gutter = 0.0130
Manning's N from gutter to grade break = 0.0130
Manning's N from grade break to crown = 0.0130
Estimated mean flow rate at midpoint of street = 4.031(CFS) Depth of flow = 0.341(Ft.), Average velocity = 3.157(Ft/s) Streetflow hydraulics at midpoint of street travel:

Halfstreet flow width = 10.725(Ft.)
Flow velocity = 3.16(Ft/s)
Travel time = 7.50 min. TC = 19.70 min.

Adding area flow to street
SINGLE FAMILY (1/4 Acre Lot)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Runoff Coefficient = 0.760
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.500
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.500
RI index for soil(AMC 2) = 65.50
Pervious area fraction = 0.500; Impervious fraction = 0.500 Rainfall intensity = 1.549(In/Hr) for a 10.0 year storm Subarea runoff = 3.719(CFS) for 3.160(Ac.)
Total runoff = 5.842(CFS) Total area = 4.460(Ac.) Street flow at end of street = 5.842(CFS)
Half street flow at end of street = 5.842(CFS)
Depth of flow = 0.377(Ft.), Average velocity = 3.444(Ft/s) Flow width (from curb towards crown)= 12.530(Ft.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 141.000 to Point/Station 142.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1498.800(Ft.)
Downstream point/station elevation = 1498.000(Ft.)
Pipe length = 70.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 5.842(CFS)
Nearest computed pipe diameter = 15.00(In.)
Calculated individual pipe flow = 5.842(CFS)
Normal flow depth in pipe = 10.58(In.)
Flow top width inside pipe = 13.67(In.)
Critical Depth = 11.73(In.)
Pipe flow velocity = 6.31(Ft/s)
Travel time through pipe = 0.18 min.

Time of concentration (TC) = 19.89 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 141.000 to Point/Station 142.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 4 in normal stream number 1
Stream flow area = 4.460(Ac.)
Runoff from this stream = 5.842(CFS)
Time of concentration = 19.89 min.

Rainfall intensity = 1.542(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 117.000 to Point/Station 143.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 722.000(Ft.)
Top (of initial area) elevation = 1543.800(Ft.)
Bottom (of initial area) elevation = 1537.300(Ft.)
Difference in elevation = 6.500(Ft.)
Slope = 0.00900 s(percent)= 0.90
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 13.919 min.

Rainfall intensity = 1.862(In/Hr) for a 10.0 year storm SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.777
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.500
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.500
RI index for soil(AMC 2) = 65.50
Pervious area fraction = 0.500; Impervious fraction = 0.500 Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Initial subarea runoff = 1.664(CFS)
Total initial stream area = 1.150(Ac.)
Pervious area fraction = 0.500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 143.000 to Point/Station 144.000 **** STREET FLOW TRAVEL TIME + SUBAREA FLOW ADDITION **** ______________________________________________________________________ Top of street segment elevation = 1537.300(Ft.)
End of street segment elevation = 1528.600(Ft.)
Length of street segment = 863.000(Ft.)
Height of curb above gutter flowline = 8.0(In.)
Width of half street (curb to crown) = 38.000(Ft.)
Distance from crown to crossfall grade break = 20.000(Ft.) Slope from gutter to grade break (v/hz) = 0.020
Slope from grade break to crown (v/hz) = 0.020
Street flow is on [1] side(s) of the street
Distance from curb to property line = 40.000(Ft.)
Slope from curb to property line (v/hz) = 0.020
Gutter width = 2.000(Ft.)
Gutter hike from flowline = 2.000(In.)
Manning's N in gutter = 0.0130
Manning's N from gutter to grade break = 0.0130
Manning's N from grade break to crown = 0.0130
Estimated mean flow rate at midpoint of street = 2.505(CFS) Depth of flow = 0.313(Ft.), Average velocity = 2.524(Ft/s) Streetflow hydraulics at midpoint of street travel:

Halfstreet flow width = 9.306(Ft.)
Flow velocity = 2.52(Ft/s)
Travel time = 5.70 min. TC = 19.62 min.

Adding area flow to street
SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.792
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.100
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.900
RI index for soil(AMC 2) = 73.10
Pervious area fraction = 0.500; Impervious fraction = 0.500 Rainfall intensity = 1.553(In/Hr) for a 10.0 year storm Subarea runoff = 1.611(CFS) for 1.310(Ac.)
Total runoff = 3.275(CFS) Total area = 2.460(Ac.) Street flow at end of street = 3.275(CFS)
Half street flow at end of street = 3.275(CFS)
Depth of flow = 0.336(Ft.), Average velocity = 2.682(Ft/s) Flow width (from curb towards crown)= 10.460(Ft.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 144.000 to Point/Station 145.000 **** STREET FLOW TRAVEL TIME + SUBAREA FLOW ADDITION **** ______________________________________________________________________ Top of street segment elevation = 1528.600(Ft.)
End of street segment elevation = 1498.100(Ft.)
Length of street segment = 1850.000(Ft.)
Height of curb above gutter flowline = 8.0(In.)
Width of half street (curb to crown) = 38.000(Ft.)
Distance from crown to crossfall grade break = 20.000(Ft.) Slope from gutter to grade break (v/hz) = 0.020
Slope from grade break to crown (v/hz) = 0.020
Street flow is on [1] side(s) of the street
Distance from curb to property line = 40.000(Ft.)
Slope from curb to property line (v/hz) = 0.020
Gutter width = 2.000(Ft.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Gutter hike from flowline = 2.000(In.)
Manning's N in gutter = 0.0130
Manning's N from gutter to grade break = 0.0130
Manning's N from grade break to crown = 0.0130
Estimated mean flow rate at midpoint of street = 4.657(CFS) Depth of flow = 0.346(Ft.), Average velocity = 3.516(Ft/s) Streetflow hydraulics at midpoint of street travel:

Halfstreet flow width = 10.945(Ft.)
Flow velocity = 3.52(Ft/s)
Travel time = 8.77 min. TC = 28.39 min.

Adding area flow to street
SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.740
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.500
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.500
RI index for soil(AMC 2) = 65.50
Pervious area fraction = 0.500; Impervious fraction = 0.500 Rainfall intensity = 1.277(In/Hr) for a 10.0 year storm Subarea runoff = 2.693(CFS) for 2.850(Ac.)
Total runoff = 5.968(CFS) Total area = 5.310(Ac.) Street flow at end of street = 5.968(CFS)
Half street flow at end of street = 5.968(CFS)
Depth of flow = 0.370(Ft.), Average velocity = 3.726(Ft/s) Flow width (from curb towards crown)= 12.145(Ft.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 145.000 to Point/Station 142.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1498.600(Ft.)
Downstream point/station elevation = 1498.100(Ft.)
Pipe length = 50.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 5.968(CFS)
Nearest computed pipe diameter = 15.00(In.)
Calculated individual pipe flow = 5.968(CFS)
Normal flow depth in pipe = 11.38(In.)
Flow top width inside pipe = 12.84(In.)
Critical Depth = 11.85(In.)
Pipe flow velocity = 5.98(Ft/s)
Travel time through pipe = 0.14 min.

Time of concentration (TC) = 28.53 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 145.000 to Point/Station 142.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 4 in normal stream number 2
Stream flow area = 5.310(Ac.)
Runoff from this stream = 5.968(CFS)
Time of concentration = 28.53 min.

Rainfall intensity = 1.273(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 5.842 19.89 1.542
2 5.968 28.53 1.273
Largest stream flow has longer time of concentration
Qp = 5.968 + sum of
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Qb Ia/Ib

5.842 * 0.826 = 4.825
Qp = 10.793
Total of 2 streams to confluence:

Flow rates before confluence point:

5.842 5.968
Area of streams before confluence:

4.460 5.310
Results of confluence:

Total flow rate = 10.793(CFS)
Time of concentration = 28.528 min.

Effective stream area after confluence = 9.770(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 142.000 to Point/Station 134.400 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1498.100(Ft.)
Downstream point/station elevation = 1496.000(Ft.)
Pipe length = 116.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 10.793(CFS)
Nearest computed pipe diameter = 18.00(In.)
Calculated individual pipe flow = 10.793(CFS)
Normal flow depth in pipe = 11.78(In.)
Flow top width inside pipe = 17.12(In.)
Critical Depth = 15.12(In.)
Pipe flow velocity = 8.81(Ft/s)
Travel time through pipe = 0.22 min.

Time of concentration (TC) = 28.75 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 142.000 to Point/Station 134.400 **** CONFLUENCE OF MAIN STREAMS ****
______________________________________________________________________ The following data inside Main Stream is listed:

In Main Stream number: 4
Stream flow area = 9.770(Ac.)
Runoff from this stream = 10.793(CFS)
Time of concentration = 28.75 min.

Rainfall intensity = 1.268(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 76.674 13.66 1.881
2 5.332 14.28 1.838
3 30.021 16.03 1.728
4 10.793 28.75 1.268
Largest stream flow has longer or shorter time of concentration Qp = 76.674 + sum of
Qa Tb/Ta

5.332 * 0.957 = 5.100
Qa Tb/Ta

30.021 * 0.852 = 25.584
Qa Tb/Ta

10.793 * 0.475 = 5.128
Qp = 112.486
Total of 4 main streams to confluence:

Flow rates before confluence point:

Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3

76.674 5.332 30.021 10.793
Area of streams before confluence:

59.770 4.150 20.400 9.770
Results of confluence:

Total flow rate = 112.486(CFS)
Time of concentration = 13.658 min.

Effective stream area after confluence = 94.090(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 142.000 to Point/Station 134.400 **** SUBAREA FLOW ADDITION ****
______________________________________________________________________ UNDEVELOPED (fair cover) subarea
Runoff Coefficient = 0.683
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 2) = 69.00
Pervious area fraction = 1.000; Impervious fraction = 0.000 Time of concentration = 13.66 min.

Rainfall intensity = 1.881(In/Hr) for a 10.0 year storm Subarea runoff = 2.299(CFS) for 1.790(Ac.)
Total runoff = 114.785(CFS) Total area = 95.880(Ac.) End of computations, total study area = 95.88 (Ac.) The following figures may
be used for a unit hydrograph study of the same area.

Area averaged pervious area fraction(Ap) = 0.724
Area averaged RI index number = 70.6
R\
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
· Area ‘A’ – 100 Year Post-Development Condition – Rational Method Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Riverside County Rational Hydrology Program
CIVILCADD/CIVILDESIGN Engineering Software,(c) 1989 - 2014 Version 9.0 Rational Hydrology Study Date: 11/08/21 File:PR100.out ------------------------------------------------------------------------ TRACT 31194 - 'GOLDEN MEADOWS' MAJOR MODIFICATION
PRELIMINARY HYDROLOGY STUDY – AREA ‘A’
DEVELOPED CONDITION RATIONAL METHOD - 100 YEAR STORM

HUNSAKER & ASSOCIATES, BRIAN LOWELL, PE
------------------------------------------------------------------------ ********* Hydrology Study Control Information ********** English (in-lb) Units used in input data file
------------------------------------------------------------------------ Program License Serial Number 6406
------------------------------------------------------------------------ Rational Method Hydrology Program based on
Riverside County Flood Control & Water Conservation District 1978 hydrology manual
Storm event (year) = 100.00 Antecedent Moisture Condition = 3 2 year, 1 hour precipitation = 0.550(In.)
100 year, 1 hour precipitation = 1.300(In.)
Storm event year = 100.0
Calculated rainfall intensity data:
1 hour intensity = 1.300(In/Hr)
Slope of intensity duration curve = 0.5300
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 100.000 to Point/Station 101.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 448.000(Ft.)
Top (of initial area) elevation = 1800.000(Ft.)
Bottom (of initial area) elevation = 1660.000(Ft.)
Difference in elevation = 140.000(Ft.)
Slope = 0.31250 s(percent)= 31.25
TC = k(0.530)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 7.688 min.

Rainfall intensity = 3.863(In/Hr) for a 100.0 year storm UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.866
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 3) = 89.80
Pervious area fraction = 1.000; Impervious fraction = 0.000 Initial subarea runoff = 10.972(CFS)
Total initial stream area = 3.280(Ac.)
Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Process from Point/Station 101.000 to Point/Station 102.000 **** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
______________________________________________________________________ Top of natural channel elevation = 1660.000(Ft.)
End of natural channel elevation = 1565.300(Ft.)
Length of natural channel = 618.000(Ft.)
Estimated mean flow rate at midpoint of channel = 26.226(CFS) Natural valley channel type used
L.A. County flood control district formula for channel velocity:

Velocity(ft/s) = (7 + 8(q(English Units)^.352)(slope^0.5) Velocity using mean channel flow = 11.93(Ft/s)
Correction to map slope used on extremely rugged channels with drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.1532
Corrected/adjusted channel slope = 0.1366
Travel time = 0.86 min. TC = 8.55 min.

Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.864
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 3) = 89.80
Pervious area fraction = 1.000; Impervious fraction = 0.000 Rainfall intensity = 3.651(In/Hr) for a 100.0 year storm Subarea runoff = 28.771(CFS) for 9.120(Ac.)
Total runoff = 39.743(CFS) Total area = 12.400(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 102.000 to Point/Station 102.100 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1565.300(Ft.)
Downstream point/station elevation = 1563.000(Ft.)
Pipe length = 123.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 39.743(CFS)
Nearest computed pipe diameter = 27.00(In.)
Calculated individual pipe flow = 39.743(CFS)
Normal flow depth in pipe = 20.77(In.)
Flow top width inside pipe = 22.76(In.)
Critical Depth = 25.06(In.)
Pipe flow velocity = 12.11(Ft/s)
Travel time through pipe = 0.17 min.

Time of concentration (TC) = 8.72 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 102.100 to Point/Station 102.100 **** SUBAREA FLOW ADDITION ****
______________________________________________________________________ SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.850
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 3) = 74.80
Pervious area fraction = 0.500; Impervious fraction = 0.500 Time of concentration = 8.72 min.

Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Rainfall intensity = 3.613(In/Hr) for a 100.0 year storm Subarea runoff = 3.164(CFS) for 1.030(Ac.)
Total runoff = 42.907(CFS) Total area = 13.430(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 102.100 to Point/Station 103.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1563.000(Ft.)
Downstream point/station elevation = 1549.000(Ft.)
Pipe length = 671.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 42.907(CFS)
Nearest computed pipe diameter = 27.00(In.)
Calculated individual pipe flow = 42.907(CFS)
Normal flow depth in pipe = 21.19(In.)
Flow top width inside pipe = 22.19(In.)
Critical Depth = 25.50(In.)
Pipe flow velocity = 12.81(Ft/s)
Travel time through pipe = 0.87 min.

Time of concentration (TC) = 9.59 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 102.100 to Point/Station 103.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 1
Stream flow area = 13.430(Ac.)
Runoff from this stream = 42.907(CFS)
Time of concentration = 9.59 min.

Rainfall intensity = 3.435(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 42.907 9.59 3.435
Largest stream flow has longer time of concentration
Qp = 42.907 + sum of
Qp = 42.907
Total of 1 streams to confluence:

Flow rates before confluence point:

42.907
Area of streams before confluence:

13.430
Results of confluence:

Total flow rate = 42.907(CFS)
Time of concentration = 9.594 min.

Effective stream area after confluence = 13.430(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 104.000 to Point/Station 105.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 425.000(Ft.)
Top (of initial area) elevation = 1572.000(Ft.)
Bottom (of initial area) elevation = 1556.200(Ft.)
Difference in elevation = 15.800(Ft.)
Slope = 0.03718 s(percent)= 3.72
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 8.479 min.

Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Rainfall intensity = 3.667(In/Hr) for a 100.0 year storm SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.851
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 3) = 74.80
Pervious area fraction = 0.500; Impervious fraction = 0.500 Initial subarea runoff = 2.964(CFS)
Total initial stream area = 0.950(Ac.)
Pervious area fraction = 0.500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 105.000 to Point/Station 103.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1549.200(Ft.)
Downstream point/station elevation = 1549.000(Ft.)
Pipe length = 15.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 2.964(CFS)
Nearest computed pipe diameter = 12.00(In.)
Calculated individual pipe flow = 2.964(CFS)
Normal flow depth in pipe = 7.55(In.)
Flow top width inside pipe = 11.59(In.)
Critical Depth = 8.86(In.)
Pipe flow velocity = 5.70(Ft/s)
Travel time through pipe = 0.04 min.

Time of concentration (TC) = 8.52 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 105.000 to Point/Station 103.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 2
Stream flow area = 0.950(Ac.)
Runoff from this stream = 2.964(CFS)
Time of concentration = 8.52 min.

Rainfall intensity = 3.657(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 42.907 9.59 3.435
2 2.964 8.52 3.657
Largest stream flow has longer time of concentration
Qp = 42.907 + sum of
Qb Ia/Ib

2.964 * 0.939 = 2.784
Qp = 45.692
Total of 2 streams to confluence:

Flow rates before confluence point:

42.907 2.964
Area of streams before confluence:

13.430 0.950
Results of confluence:

Total flow rate = 45.692(CFS)
Time of concentration = 9.594 min.

Effective stream area after confluence = 14.380(Ac.) Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 103.000 to Point/Station 106.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1549.000(Ft.)
Downstream point/station elevation = 1548.700(Ft.)
Pipe length = 29.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 45.692(CFS)
Nearest computed pipe diameter = 33.00(In.)
Calculated individual pipe flow = 45.692(CFS)
Normal flow depth in pipe = 23.34(In.)
Flow top width inside pipe = 30.03(In.)
Critical Depth = 26.86(In.)
Pipe flow velocity = 10.16(Ft/s)
Travel time through pipe = 0.05 min.

Time of concentration (TC) = 9.64 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 103.000 to Point/Station 106.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 1
Stream flow area = 14.380(Ac.)
Runoff from this stream = 45.692(CFS)
Time of concentration = 9.64 min.

Rainfall intensity = 3.426(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 104.000 to Point/Station 107.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 553.000(Ft.)
Top (of initial area) elevation = 1572.000(Ft.)
Bottom (of initial area) elevation = 1564.600(Ft.)
Difference in elevation = 7.400(Ft.)
Slope = 0.01338 s(percent)= 1.34
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 11.557 min.

Rainfall intensity = 3.112(In/Hr) for a 100.0 year storm SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.843
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 3) = 74.80
Pervious area fraction = 0.500; Impervious fraction = 0.500 Initial subarea runoff = 3.097(CFS)
Total initial stream area = 1.180(Ac.)
Pervious area fraction = 0.500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 107.000 to Point/Station 108.000 **** STREET FLOW TRAVEL TIME + SUBAREA FLOW ADDITION **** ______________________________________________________________________ Top of street segment elevation = 1564.600(Ft.)
End of street segment elevation = 1556.200(Ft.)
Length of street segment = 684.000(Ft.)
Height of curb above gutter flowline = 6.0(In.)
Width of half street (curb to crown) = 18.000(Ft.)
Distance from crown to crossfall grade break = 16.000(Ft.) Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Slope from gutter to grade break (v/hz) = 0.020
Slope from grade break to crown (v/hz) = 0.020
Street flow is on [1] side(s) of the street
Distance from curb to property line = 10.000(Ft.)
Slope from curb to property line (v/hz) = 0.020
Gutter width = 2.000(Ft.)
Gutter hike from flowline = 2.000(In.)
Manning's N in gutter = 0.0130
Manning's N from gutter to grade break = 0.0130
Manning's N from grade break to crown = 0.0130
Estimated mean flow rate at midpoint of street = 5.087(CFS) Depth of flow = 0.368(Ft.), Average velocity = 3.206(Ft/s) Streetflow hydraulics at midpoint of street travel:

Halfstreet flow width = 12.083(Ft.)
Flow velocity = 3.21(Ft/s)
Travel time = 3.56 min. TC = 15.11 min.

Adding area flow to street
SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.846
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.750
Decimal fraction soil group C = 0.050
Decimal fraction soil group D = 0.200
RI index for soil(AMC 3) = 78.36
Pervious area fraction = 0.500; Impervious fraction = 0.500 Rainfall intensity = 2.700(In/Hr) for a 100.0 year storm Subarea runoff = 3.905(CFS) for 1.710(Ac.)
Total runoff = 7.002(CFS) Total area = 2.890(Ac.) Street flow at end of street = 7.002(CFS)
Half street flow at end of street = 7.002(CFS)
Depth of flow = 0.402(Ft.), Average velocity = 3.459(Ft/s) Flow width (from curb towards crown)= 13.775(Ft.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 108.000 to Point/Station 106.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1549.200(Ft.)
Downstream point/station elevation = 1548.700(Ft.)
Pipe length = 42.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 7.002(CFS)
Nearest computed pipe diameter = 15.00(In.)
Calculated individual pipe flow = 7.002(CFS)
Normal flow depth in pipe = 12.21(In.)
Flow top width inside pipe = 11.67(In.)
Critical Depth = 12.71(In.)
Pipe flow velocity = 6.55(Ft/s)
Travel time through pipe = 0.11 min.

Time of concentration (TC) = 15.22 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 108.000 to Point/Station 106.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 2
Stream flow area = 2.890(Ac.)
Runoff from this stream = 7.002(CFS)
Time of concentration = 15.22 min.

Rainfall intensity = 2.690(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
1 45.692 9.64 3.426
2 7.002 15.22 2.690
Largest stream flow has longer or shorter time of concentration Qp = 45.692 + sum of
Qa Tb/Ta

7.002 * 0.633 = 4.436
Qp = 50.127
Total of 2 streams to confluence:

Flow rates before confluence point:

45.692 7.002
Area of streams before confluence:

14.380 2.890
Results of confluence:

Total flow rate = 50.127(CFS)
Time of concentration = 9.642 min.

Effective stream area after confluence = 17.270(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 106.000 to Point/Station 109.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1548.700(Ft.)
Downstream point/station elevation = 1523.000(Ft.)
Pipe length = 620.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 50.127(CFS)
Nearest computed pipe diameter = 27.00(In.)
Calculated individual pipe flow = 50.127(CFS)
Normal flow depth in pipe = 18.19(In.)
Flow top width inside pipe = 25.32(In.)
Critical depth could not be calculated.

Pipe flow velocity = 17.60(Ft/s)
Travel time through pipe = 0.59 min.

Time of concentration (TC) = 10.23 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 106.000 to Point/Station 109.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 1
Stream flow area = 17.270(Ac.)
Runoff from this stream = 50.127(CFS)
Time of concentration = 10.23 min.

Rainfall intensity = 3.320(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 110.000 to Point/Station 111.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 530.000(Ft.)
Top (of initial area) elevation = 1540.000(Ft.)
Bottom (of initial area) elevation = 1530.000(Ft.)
Difference in elevation = 10.000(Ft.)
Slope = 0.01887 s(percent)= 1.89
TC = k(0.710)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 19.312 min.

Rainfall intensity = 2.371(In/Hr) for a 100.0 year storm UNDEVELOPED (fair cover) subarea
Runoff Coefficient = 0.858
Decimal fraction soil group A = 0.000
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Decimal fraction soil group B = 0.150
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.850
RI index for soil(AMC 3) = 92.05
Pervious area fraction = 1.000; Impervious fraction = 0.000 Initial subarea runoff = 5.982(CFS)
Total initial stream area = 2.940(Ac.)
Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 111.000 to Point/Station 109.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1523.400(Ft.)
Downstream point/station elevation = 1523.000(Ft.)
Pipe length = 40.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 5.982(CFS)
Nearest computed pipe diameter = 15.00(In.)
Calculated individual pipe flow = 5.982(CFS)
Normal flow depth in pipe = 11.40(In.)
Flow top width inside pipe = 12.81(In.)
Critical Depth = 11.87(In.)
Pipe flow velocity = 5.98(Ft/s)
Travel time through pipe = 0.11 min.

Time of concentration (TC) = 19.42 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 111.000 to Point/Station 109.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 2
Stream flow area = 2.940(Ac.)
Runoff from this stream = 5.982(CFS)
Time of concentration = 19.42 min.

Rainfall intensity = 2.363(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 50.127 10.23 3.320
2 5.982 19.42 2.363
Largest stream flow has longer or shorter time of concentration Qp = 50.127 + sum of
Qa Tb/Ta

5.982 * 0.527 = 3.150
Qp = 53.278
Total of 2 streams to confluence:

Flow rates before confluence point:

50.127 5.982
Area of streams before confluence:

17.270 2.940
Results of confluence:

Total flow rate = 53.278(CFS)
Time of concentration = 10.229 min.

Effective stream area after confluence = 20.210(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 109.000 to Point/Station 112.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
______________________________________________________________________ Upstream point/station elevation = 1523.000(Ft.)
Downstream point/station elevation = 1520.800(Ft.)
Pipe length = 38.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 53.278(CFS)
Nearest computed pipe diameter = 24.00(In.)
Calculated individual pipe flow = 53.278(CFS)
Normal flow depth in pipe = 19.22(In.)
Flow top width inside pipe = 19.17(In.)
Critical depth could not be calculated.

Pipe flow velocity = 19.75(Ft/s)
Travel time through pipe = 0.03 min.

Time of concentration (TC) = 10.26 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 109.000 to Point/Station 112.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 1
Stream flow area = 20.210(Ac.)
Runoff from this stream = 53.278(CFS)
Time of concentration = 10.26 min.

Rainfall intensity = 3.315(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 113.000 to Point/Station 114.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 965.000(Ft.)
Top (of initial area) elevation = 1567.900(Ft.)
Bottom (of initial area) elevation = 1556.000(Ft.)
Difference in elevation = 11.900(Ft.)
Slope = 0.01233 s(percent)= 1.23
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 14.678 min.

Rainfall intensity = 2.742(In/Hr) for a 100.0 year storm SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.861
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.300
Decimal fraction soil group C = 0.300
Decimal fraction soil group D = 0.400
RI index for soil(AMC 3) = 83.50
Pervious area fraction = 0.500; Impervious fraction = 0.500 Initial subarea runoff = 6.677(CFS)
Total initial stream area = 2.830(Ac.)
Pervious area fraction = 0.500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 114.000 to Point/Station 115.000 **** STREET FLOW TRAVEL TIME + SUBAREA FLOW ADDITION **** ______________________________________________________________________ Top of street segment elevation = 1556.000(Ft.)
End of street segment elevation = 1529.800(Ft.)
Length of street segment = 610.000(Ft.)
Height of curb above gutter flowline = 6.0(In.)
Width of half street (curb to crown) = 18.000(Ft.)
Distance from crown to crossfall grade break = 16.000(Ft.) Slope from gutter to grade break (v/hz) = 0.020
Slope from grade break to crown (v/hz) = 0.020
Street flow is on [1] side(s) of the street
Distance from curb to property line = 10.000(Ft.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Slope from curb to property line (v/hz) = 0.020
Gutter width = 2.000(Ft.)
Gutter hike from flowline = 2.000(In.)
Manning's N in gutter = 0.0130
Manning's N from gutter to grade break = 0.0130
Manning's N from grade break to crown = 0.0130
Estimated mean flow rate at midpoint of street = 8.920(CFS) Depth of flow = 0.362(Ft.), Average velocity = 5.906(Ft/s) Streetflow hydraulics at midpoint of street travel:

Halfstreet flow width = 11.763(Ft.)
Flow velocity = 5.91(Ft/s)
Travel time = 1.72 min. TC = 16.40 min.

Adding area flow to street
SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.847
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.700
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.300
RI index for soil(AMC 3) = 79.36
Pervious area fraction = 0.500; Impervious fraction = 0.500 Rainfall intensity = 2.585(In/Hr) for a 100.0 year storm Subarea runoff = 4.400(CFS) for 2.010(Ac.)
Total runoff = 11.077(CFS) Total area = 4.840(Ac.) Street flow at end of street = 11.077(CFS)
Half street flow at end of street = 11.077(CFS)
Depth of flow = 0.384(Ft.), Average velocity = 6.216(Ft/s) Flow width (from curb towards crown)= 12.866(Ft.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 115.000 to Point/Station 112.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1521.200(Ft.)
Downstream point/station elevation = 1520.800(Ft.)
Pipe length = 30.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 11.077(CFS)
Nearest computed pipe diameter = 18.00(In.)
Calculated individual pipe flow = 11.077(CFS)
Normal flow depth in pipe = 13.52(In.)
Flow top width inside pipe = 15.56(In.)
Critical Depth = 15.29(In.)
Pipe flow velocity = 7.78(Ft/s)
Travel time through pipe = 0.06 min.

Time of concentration (TC) = 16.46 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 115.000 to Point/Station 112.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 2
Stream flow area = 4.840(Ac.)
Runoff from this stream = 11.077(CFS)
Time of concentration = 16.46 min.

Rainfall intensity = 2.580(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 104.000 to Point/Station 127.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 623.000(Ft.)
Top (of initial area) elevation = 1572.000(Ft.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Bottom (of initial area) elevation = 1552.000(Ft.)
Difference in elevation = 20.000(Ft.)
Slope = 0.03210 s(percent)= 3.21
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 10.175 min.

Rainfall intensity = 3.329(In/Hr) for a 100.0 year storm SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.847
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 3) = 74.80
Pervious area fraction = 0.500; Impervious fraction = 0.500 Initial subarea runoff = 5.017(CFS)
Total initial stream area = 1.780(Ac.)
Pervious area fraction = 0.500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 127.000 to Point/Station 128.000 **** STREET FLOW TRAVEL TIME + SUBAREA FLOW ADDITION **** ______________________________________________________________________ Top of street segment elevation = 1552.000(Ft.)
End of street segment elevation = 1529.800(Ft.)
Length of street segment = 518.000(Ft.)
Height of curb above gutter flowline = 6.0(In.)
Width of half street (curb to crown) = 18.000(Ft.)
Distance from crown to crossfall grade break = 16.000(Ft.) Slope from gutter to grade break (v/hz) = 0.020
Slope from grade break to crown (v/hz) = 0.020
Street flow is on [1] side(s) of the street
Distance from curb to property line = 10.000(Ft.)
Slope from curb to property line (v/hz) = 0.020
Gutter width = 2.000(Ft.)
Gutter hike from flowline = 2.000(In.)
Manning's N in gutter = 0.0130
Manning's N from gutter to grade break = 0.0130
Manning's N from grade break to crown = 0.0130
Estimated mean flow rate at midpoint of street = 7.583(CFS) Depth of flow = 0.346(Ft.), Average velocity = 5.681(Ft/s) Streetflow hydraulics at midpoint of street travel:

Halfstreet flow width = 10.991(Ft.)
Flow velocity = 5.68(Ft/s)
Travel time = 1.52 min. TC = 11.70 min.

Adding area flow to street
SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.855
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.700
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.300
RI index for soil(AMC 3) = 79.36
Pervious area fraction = 0.500; Impervious fraction = 0.500 Rainfall intensity = 3.093(In/Hr) for a 100.0 year storm Subarea runoff = 5.048(CFS) for 1.910(Ac.)
Total runoff = 10.065(CFS) Total area = 3.690(Ac.) Street flow at end of street = 10.065(CFS)
Half street flow at end of street = 10.065(CFS)
Depth of flow = 0.374(Ft.), Average velocity = 6.071(Ft/s) Flow width (from curb towards crown)= 12.374(Ft.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 128.000 to Point/Station 112.000 Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
**** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1521.200(Ft.)
Downstream point/station elevation = 1520.800(Ft.)
Pipe length = 45.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 10.065(CFS)
Nearest computed pipe diameter = 21.00(In.)
Calculated individual pipe flow = 10.065(CFS)
Normal flow depth in pipe = 12.62(In.)
Flow top width inside pipe = 20.57(In.)
Critical Depth = 14.17(In.)
Pipe flow velocity = 6.66(Ft/s)
Travel time through pipe = 0.11 min.

Time of concentration (TC) = 11.81 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 128.000 to Point/Station 112.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 3
Stream flow area = 3.690(Ac.)
Runoff from this stream = 10.065(CFS)
Time of concentration = 11.81 min.

Rainfall intensity = 3.077(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 53.278 10.26 3.315
2 11.077 16.46 2.580
3 10.065 11.81 3.077
Largest stream flow has longer or shorter time of concentration Qp = 53.278 + sum of
Qa Tb/Ta

11.077 * 0.623 = 6.904
Qa Tb/Ta

10.065 * 0.869 = 8.746
Qp = 68.928
Total of 3 streams to confluence:

Flow rates before confluence point:

53.278 11.077 10.065
Area of streams before confluence:

20.210 4.840 3.690
Results of confluence:

Total flow rate = 68.928(CFS)
Time of concentration = 10.261 min.

Effective stream area after confluence = 28.740(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 112.000 to Point/Station 116.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1520.800(Ft.)
Downstream point/station elevation = 1520.000(Ft.)
Pipe length = 32.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 68.928(CFS)
Nearest computed pipe diameter = 30.00(In.)
Calculated individual pipe flow = 68.928(CFS)
Normal flow depth in pipe = 26.81(In.)
Flow top width inside pipe = 18.49(In.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Critical depth could not be calculated.

Pipe flow velocity = 14.89(Ft/s)
Travel time through pipe = 0.04 min.

Time of concentration (TC) = 10.30 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 112.000 to Point/Station 116.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 1
Stream flow area = 28.740(Ac.)
Runoff from this stream = 68.928(CFS)
Time of concentration = 10.30 min.

Rainfall intensity = 3.309(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 117.000 to Point/Station 118.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 500.000(Ft.)
Top (of initial area) elevation = 1543.800(Ft.)
Bottom (of initial area) elevation = 1539.300(Ft.)
Difference in elevation = 4.500(Ft.)
Slope = 0.00900 s(percent)= 0.90
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 12.017 min.

Rainfall intensity = 3.048(In/Hr) for a 100.0 year storm SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.861
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.500
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.500
RI index for soil(AMC 3) = 82.30
Pervious area fraction = 0.500; Impervious fraction = 0.500 Initial subarea runoff = 2.337(CFS)
Total initial stream area = 0.890(Ac.)
Pervious area fraction = 0.500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 118.000 to Point/Station 119.000 **** STREET FLOW TRAVEL TIME + SUBAREA FLOW ADDITION **** ______________________________________________________________________ Top of street segment elevation = 1539.300(Ft.)
End of street segment elevation = 1529.800(Ft.)
Length of street segment = 933.000(Ft.)
Height of curb above gutter flowline = 8.0(In.)
Width of half street (curb to crown) = 38.000(Ft.)
Distance from crown to crossfall grade break = 20.000(Ft.) Slope from gutter to grade break (v/hz) = 0.020
Slope from grade break to crown (v/hz) = 0.020
Street flow is on [1] side(s) of the street
Distance from curb to property line = 40.000(Ft.)
Slope from curb to property line (v/hz) = 0.020
Gutter width = 2.000(Ft.)
Gutter hike from flowline = 2.000(In.)
Manning's N in gutter = 0.0130
Manning's N from gutter to grade break = 0.0130
Manning's N from grade break to crown = 0.0130
Estimated mean flow rate at midpoint of street = 4.180(CFS) Depth of flow = 0.358(Ft.), Average velocity = 2.850(Ft/s) Streetflow hydraulics at midpoint of street travel:

Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Halfstreet flow width = 11.576(Ft.)
Flow velocity = 2.85(Ft/s)
Travel time = 5.46 min. TC = 17.47 min.

Adding area flow to street
SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.860
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.300
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.700
RI index for soil(AMC 3) = 84.58
Pervious area fraction = 0.500; Impervious fraction = 0.500 Rainfall intensity = 2.500(In/Hr) for a 100.0 year storm Subarea runoff = 3.634(CFS) for 1.690(Ac.)
Total runoff = 5.970(CFS) Total area = 2.580(Ac.) Street flow at end of street = 5.970(CFS)
Half street flow at end of street = 5.970(CFS)
Depth of flow = 0.395(Ft.), Average velocity = 3.101(Ft/s) Flow width (from curb towards crown)= 13.412(Ft.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 119.000 to Point/Station 116.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1521.400(Ft.)
Downstream point/station elevation = 1520.000(Ft.)
Pipe length = 57.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 5.970(CFS)
Nearest computed pipe diameter = 15.00(In.)
Calculated individual pipe flow = 5.970(CFS)
Normal flow depth in pipe = 8.29(In.)
Flow top width inside pipe = 14.92(In.)
Critical Depth = 11.86(In.)
Pipe flow velocity = 8.59(Ft/s)
Travel time through pipe = 0.11 min.

Time of concentration (TC) = 17.58 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 119.000 to Point/Station 116.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 2
Stream flow area = 2.580(Ac.)
Runoff from this stream = 5.970(CFS)
Time of concentration = 17.58 min.

Rainfall intensity = 2.491(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 68.928 10.30 3.309
2 5.970 17.58 2.491
Largest stream flow has longer or shorter time of concentration Qp = 68.928 + sum of
Qa Tb/Ta

5.970 * 0.586 = 3.496
Qp = 72.424
Total of 2 streams to confluence:

Flow rates before confluence point:

68.928 5.970
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Area of streams before confluence:

28.740 2.580
Results of confluence:

Total flow rate = 72.424(CFS)
Time of concentration = 10.297 min.

Effective stream area after confluence = 31.320(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 116.000 to Point/Station 120.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1520.000(Ft.)
Downstream point/station elevation = 1519.500(Ft.)
Pipe length = 54.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 72.424(CFS)
Nearest computed pipe diameter = 39.00(In.)
Calculated individual pipe flow = 72.424(CFS)
Normal flow depth in pipe = 29.25(In.)
Flow top width inside pipe = 33.77(In.)
Critical Depth = 32.36(In.)
Pipe flow velocity = 10.86(Ft/s)
Travel time through pipe = 0.08 min.

Time of concentration (TC) = 10.38 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 116.000 to Point/Station 120.000 **** CONFLUENCE OF MAIN STREAMS ****
______________________________________________________________________ The following data inside Main Stream is listed:

In Main Stream number: 1
Stream flow area = 31.320(Ac.)
Runoff from this stream = 72.424(CFS)
Time of concentration = 10.38 min.

Rainfall intensity = 3.294(In/Hr)
Program is now starting with Main Stream No. 2
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 121.000 to Point/Station 122.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 193.000(Ft.)
Top (of initial area) elevation = 1546.000(Ft.)
Bottom (of initial area) elevation = 1544.700(Ft.)
Difference in elevation = 1.300(Ft.)
Slope = 0.00674 s(percent)= 0.67
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 8.702 min.

Rainfall intensity = 3.617(In/Hr) for a 100.0 year storm SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.878
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 1.000
RI index for soil(AMC 3) = 88.00
Pervious area fraction = 0.500; Impervious fraction = 0.500 Initial subarea runoff = 3.082(CFS)
Total initial stream area = 0.970(Ac.)
Pervious area fraction = 0.500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Process from Point/Station 122.000 to Point/Station 123.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1537.700(Ft.)
Downstream point/station elevation = 1531.700(Ft.)
Pipe length = 496.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 3.082(CFS)
Nearest computed pipe diameter = 12.00(In.)
Calculated individual pipe flow = 3.082(CFS)
Normal flow depth in pipe = 8.02(In.)
Flow top width inside pipe = 11.30(In.)
Critical Depth = 9.03(In.)
Pipe flow velocity = 5.53(Ft/s)
Travel time through pipe = 1.50 min.

Time of concentration (TC) = 10.20 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 122.000 to Point/Station 123.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 2 in normal stream number 1
Stream flow area = 0.970(Ac.)
Runoff from this stream = 3.082(CFS)
Time of concentration = 10.20 min.

Rainfall intensity = 3.325(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 124.000 to Point/Station 125.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 960.000(Ft.)
Top (of initial area) elevation = 1549.500(Ft.)
Bottom (of initial area) elevation = 1539.000(Ft.)
Difference in elevation = 10.500(Ft.)
Slope = 0.01094 s(percent)= 1.09
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 15.003 min.

Rainfall intensity = 2.710(In/Hr) for a 100.0 year storm SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.860
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.400
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.600
RI index for soil(AMC 3) = 83.44
Pervious area fraction = 0.500; Impervious fraction = 0.500 Initial subarea runoff = 10.697(CFS)
Total initial stream area = 4.590(Ac.)
Pervious area fraction = 0.500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 125.000 to Point/Station 123.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1532.000(Ft.)
Downstream point/station elevation = 1531.700(Ft.)
Pipe length = 26.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 10.697(CFS)
Nearest computed pipe diameter = 18.00(In.)
Calculated individual pipe flow = 10.697(CFS)
Normal flow depth in pipe = 13.97(In.)
Flow top width inside pipe = 15.01(In.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Critical Depth = 15.06(In.)
Pipe flow velocity = 7.26(Ft/s)
Travel time through pipe = 0.06 min.

Time of concentration (TC) = 15.06 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 125.000 to Point/Station 123.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 2 in normal stream number 2
Stream flow area = 4.590(Ac.)
Runoff from this stream = 10.697(CFS)
Time of concentration = 15.06 min.

Rainfall intensity = 2.704(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 124.000 to Point/Station 126.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 1000.000(Ft.)
Top (of initial area) elevation = 1549.500(Ft.)
Bottom (of initial area) elevation = 1539.000(Ft.)
Difference in elevation = 10.500(Ft.)
Slope = 0.01050 s(percent)= 1.05
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 15.375 min.

Rainfall intensity = 2.675(In/Hr) for a 100.0 year storm SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.863
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.300
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.700
RI index for soil(AMC 3) = 84.58
Pervious area fraction = 0.500; Impervious fraction = 0.500 Initial subarea runoff = 11.537(CFS)
Total initial stream area = 5.000(Ac.)
Pervious area fraction = 0.500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 126.000 to Point/Station 123.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1532.000(Ft.)
Downstream point/station elevation = 1531.700(Ft.)
Pipe length = 20.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 11.537(CFS)
Nearest computed pipe diameter = 18.00(In.)
Calculated individual pipe flow = 11.537(CFS)
Normal flow depth in pipe = 13.31(In.)
Flow top width inside pipe = 15.80(In.)
Critical Depth = 15.54(In.)
Pipe flow velocity = 8.24(Ft/s)
Travel time through pipe = 0.04 min.

Time of concentration (TC) = 15.42 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 126.000 to Point/Station 123.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 2 in normal stream number 3
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Stream flow area = 5.000(Ac.)
Runoff from this stream = 11.537(CFS)
Time of concentration = 15.42 min.

Rainfall intensity = 2.671(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 3.082 10.20 3.325
2 10.697 15.06 2.704
3 11.537 15.42 2.671
Largest stream flow has longer time of concentration
Qp = 11.537 + sum of
Qb Ia/Ib

3.082 * 0.803 = 2.476
Qb Ia/Ib

10.697 * 0.988 = 10.567
Qp = 24.580
Total of 3 streams to confluence:

Flow rates before confluence point:

3.082 10.697 11.537
Area of streams before confluence:

0.970 4.590 5.000
Results of confluence:

Total flow rate = 24.580(CFS)
Time of concentration = 15.416 min.

Effective stream area after confluence = 10.560(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 123.000 to Point/Station 120.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1531.700(Ft.)
Downstream point/station elevation = 1519.500(Ft.)
Pipe length = 800.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 24.580(CFS)
Nearest computed pipe diameter = 24.00(In.)
Calculated individual pipe flow = 24.580(CFS)
Normal flow depth in pipe = 17.46(In.)
Flow top width inside pipe = 21.37(In.)
Critical Depth = 21.02(In.)
Pipe flow velocity = 10.03(Ft/s)
Travel time through pipe = 1.33 min.

Time of concentration (TC) = 16.74 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 123.000 to Point/Station 120.000 **** CONFLUENCE OF MAIN STREAMS ****
______________________________________________________________________ The following data inside Main Stream is listed:

In Main Stream number: 2
Stream flow area = 10.560(Ac.)
Runoff from this stream = 24.580(CFS)
Time of concentration = 16.74 min.

Rainfall intensity = 2.557(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
1 72.424 10.38 3.294
2 24.580 16.74 2.557
Largest stream flow has longer or shorter time of concentration Qp = 72.424 + sum of
Qa Tb/Ta

24.580 * 0.620 = 15.236
Qp = 87.660
Total of 2 main streams to confluence:

Flow rates before confluence point:

72.424 24.580
Area of streams before confluence:

31.320 10.560
Results of confluence:

Total flow rate = 87.660(CFS)
Time of concentration = 10.380 min.

Effective stream area after confluence = 41.880(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 120.000 to Point/Station 128.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1519.500(Ft.)
Downstream point/station elevation = 1509.000(Ft.)
Pipe length = 1360.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 87.660(CFS)
Nearest computed pipe diameter = 42.00(In.)
Calculated individual pipe flow = 87.660(CFS)
Normal flow depth in pipe = 34.13(In.)
Flow top width inside pipe = 32.79(In.)
Critical Depth = 34.95(In.)
Pipe flow velocity = 10.48(Ft/s)
Travel time through pipe = 2.16 min.

Time of concentration (TC) = 12.54 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 120.000 to Point/Station 128.000 **** CONFLUENCE OF MAIN STREAMS ****
______________________________________________________________________ The following data inside Main Stream is listed:

In Main Stream number: 1
Stream flow area = 41.880(Ac.)
Runoff from this stream = 87.660(CFS)
Time of concentration = 12.54 min.

Rainfall intensity = 2.980(In/Hr)
Program is now starting with Main Stream No. 2
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 158.000 to Point/Station 159.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 245.000(Ft.)
Top (of initial area) elevation = 1720.000(Ft.)
Bottom (of initial area) elevation = 1659.000(Ft.)
Difference in elevation = 61.000(Ft.)
Slope = 0.24898 s(percent)= 24.90
TC = k(0.530)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 6.320 min.

Rainfall intensity = 4.285(In/Hr) for a 100.0 year storm Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.869
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 3) = 89.80
Pervious area fraction = 1.000; Impervious fraction = 0.000 Initial subarea runoff = 4.135(CFS)
Total initial stream area = 1.110(Ac.)
Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 158.000 to Point/Station 159.000 **** SUBAREA FLOW ADDITION ****
______________________________________________________________________ COMMERCIAL subarea type
Runoff Coefficient = 0.891
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 3) = 74.80
Pervious area fraction = 0.100; Impervious fraction = 0.900 Time of concentration = 6.32 min.

Rainfall intensity = 4.285(In/Hr) for a 100.0 year storm Subarea runoff = 1.566(CFS) for 0.410(Ac.)
Total runoff = 5.701(CFS) Total area = 1.520(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 158.000 to Point/Station 159.000 **** SUBAREA FLOW ADDITION ****
______________________________________________________________________ COMMERCIAL subarea type
Runoff Coefficient = 0.891
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 3) = 74.80
Pervious area fraction = 0.100; Impervious fraction = 0.900 Time of concentration = 6.32 min.

Rainfall intensity = 4.285(In/Hr) for a 100.0 year storm Subarea runoff = 2.712(CFS) for 0.710(Ac.)
Total runoff = 8.414(CFS) Total area = 2.230(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 160.000 to Point/Station 161.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1650.000(Ft.)
Downstream point/station elevation = 1512.000(Ft.)
Pipe length = 965.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 8.414(CFS)
Nearest computed pipe diameter = 12.00(In.)
Calculated individual pipe flow = 8.414(CFS)
Normal flow depth in pipe = 6.87(In.)
Flow top width inside pipe = 11.87(In.)
Critical depth could not be calculated.

Pipe flow velocity = 18.09(Ft/s)
Travel time through pipe = 0.89 min.

Time of concentration (TC) = 7.21 min.

Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 160.000 to Point/Station 161.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 2 in normal stream number 1
Stream flow area = 2.230(Ac.)
Runoff from this stream = 8.414(CFS)
Time of concentration = 7.21 min.

Rainfall intensity = 3.997(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 162.000 to Point/Station 163.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 945.000(Ft.)
Top (of initial area) elevation = 1717.700(Ft.)
Bottom (of initial area) elevation = 1520.000(Ft.)
Difference in elevation = 197.700(Ft.)
Slope = 0.20921 s(percent)= 20.92
TC = k(0.530)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 11.229 min.

Rainfall intensity = 3.160(In/Hr) for a 100.0 year storm UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.865
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.700
Decimal fraction soil group C = 0.300
Decimal fraction soil group D = 0.000
RI index for soil(AMC 3) = 91.24
Pervious area fraction = 1.000; Impervious fraction = 0.000 Initial subarea runoff = 12.682(CFS)
Total initial stream area = 4.640(Ac.)
Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 163.000 to Point/Station 161.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1513.000(Ft.)
Downstream point/station elevation = 1512.000(Ft.)
Pipe length = 23.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 12.682(CFS)
Nearest computed pipe diameter = 15.00(In.)
Calculated individual pipe flow = 12.682(CFS)
Normal flow depth in pipe = 11.58(In.)
Flow top width inside pipe = 12.59(In.)
Critical depth could not be calculated.

Pipe flow velocity = 12.48(Ft/s)
Travel time through pipe = 0.03 min.

Time of concentration (TC) = 11.26 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 163.000 to Point/Station 161.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 2 in normal stream number 2
Stream flow area = 4.640(Ac.)
Runoff from this stream = 12.682(CFS)
Time of concentration = 11.26 min.

Rainfall intensity = 3.155(In/Hr)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 8.414 7.21 3.997
2 12.682 11.26 3.155
Largest stream flow has longer time of concentration
Qp = 12.682 + sum of
Qb Ia/Ib

8.414 * 0.790 = 6.643
Qp = 19.325
Total of 2 streams to confluence:

Flow rates before confluence point:

8.414 12.682
Area of streams before confluence:

2.230 4.640
Results of confluence:

Total flow rate = 19.325(CFS)
Time of concentration = 11.260 min.

Effective stream area after confluence = 6.870(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 163.000 to Point/Station 161.000 **** SUBAREA FLOW ADDITION ****
______________________________________________________________________ UNDEVELOPED (fair cover) subarea
Runoff Coefficient = 0.861
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 1.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 3) = 90.40
Pervious area fraction = 1.000; Impervious fraction = 0.000 Time of concentration = 11.26 min.

Rainfall intensity = 3.155(In/Hr) for a 100.0 year storm Subarea runoff = 1.631(CFS) for 0.600(Ac.)
Total runoff = 20.956(CFS) Total area = 7.470(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 161.000 to Point/Station 128.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1512.000(Ft.)
Downstream point/station elevation = 1509.000(Ft.)
Pipe length = 567.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 20.956(CFS)
Nearest computed pipe diameter = 27.00(In.)
Calculated individual pipe flow = 20.956(CFS)
Normal flow depth in pipe = 20.63(In.)
Flow top width inside pipe = 22.93(In.)
Critical Depth = 19.22(In.)
Pipe flow velocity = 6.44(Ft/s)
Travel time through pipe = 1.47 min.

Time of concentration (TC) = 12.73 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 161.000 to Point/Station 128.000 **** CONFLUENCE OF MAIN STREAMS ****
______________________________________________________________________ Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
The following data inside Main Stream is listed:

In Main Stream number: 2
Stream flow area = 7.470(Ac.)
Runoff from this stream = 20.956(CFS)
Time of concentration = 12.73 min.

Rainfall intensity = 2.957(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 87.660 12.54 2.980
2 20.956 12.73 2.957
Largest stream flow has longer or shorter time of concentration Qp = 87.660 + sum of
Qa Tb/Ta

20.956 * 0.986 = 20.652
Qp = 108.312
Total of 2 main streams to confluence:

Flow rates before confluence point:

87.660 20.956
Area of streams before confluence:

41.880 7.470
Results of confluence:

Total flow rate = 108.312(CFS)
Time of concentration = 12.543 min.

Effective stream area after confluence = 49.350(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 128.000 to Point/Station 129.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1509.000(Ft.)
Downstream point/station elevation = 1499.100(Ft.)
Pipe length = 333.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 108.312(CFS)
Nearest computed pipe diameter = 36.00(In.)
Calculated individual pipe flow = 108.312(CFS)
Normal flow depth in pipe = 27.80(In.)
Flow top width inside pipe = 30.20(In.)
Critical depth could not be calculated.

Pipe flow velocity = 18.50(Ft/s)
Travel time through pipe = 0.30 min.

Time of concentration (TC) = 12.84 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 128.000 to Point/Station 129.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 1
Stream flow area = 49.350(Ac.)
Runoff from this stream = 108.312(CFS)
Time of concentration = 12.84 min.

Rainfall intensity = 2.943(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 130.000 to Point/Station 131.000 **** INITIAL AREA EVALUATION ****
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
______________________________________________________________________ Initial area flow distance = 994.000(Ft.)
Top (of initial area) elevation = 1521.000(Ft.)
Bottom (of initial area) elevation = 1508.600(Ft.)
Difference in elevation = 12.400(Ft.)
Slope = 0.01247 s(percent)= 1.25
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 14.819 min.

Rainfall intensity = 2.728(In/Hr) for a 100.0 year storm SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.849
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.700
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.300
RI index for soil(AMC 3) = 79.36
Pervious area fraction = 0.500; Impervious fraction = 0.500 Initial subarea runoff = 5.421(CFS)
Total initial stream area = 2.340(Ac.)
Pervious area fraction = 0.500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 131.000 to Point/Station 129.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1499.400(Ft.)
Downstream point/station elevation = 1499.100(Ft.)
Pipe length = 22.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 5.421(CFS)
Nearest computed pipe diameter = 15.00(In.)
Calculated individual pipe flow = 5.421(CFS)
Normal flow depth in pipe = 9.41(In.)
Flow top width inside pipe = 14.51(In.)
Critical Depth = 11.32(In.)
Pipe flow velocity = 6.69(Ft/s)
Travel time through pipe = 0.05 min.

Time of concentration (TC) = 14.87 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 131.000 to Point/Station 129.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 2
Stream flow area = 2.340(Ac.)
Runoff from this stream = 5.421(CFS)
Time of concentration = 14.87 min.

Rainfall intensity = 2.723(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 132.000 to Point/Station 133.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 636.000(Ft.)
Top (of initial area) elevation = 1526.500(Ft.)
Bottom (of initial area) elevation = 1519.100(Ft.)
Difference in elevation = 7.400(Ft.)
Slope = 0.01164 s(percent)= 1.16
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 12.569 min.

Rainfall intensity = 2.977(In/Hr) for a 100.0 year storm SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.874
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 1.000
RI index for soil(AMC 3) = 88.00
Pervious area fraction = 0.500; Impervious fraction = 0.500 Initial subarea runoff = 3.539(CFS)
Total initial stream area = 1.360(Ac.)
Pervious area fraction = 0.500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 133.000 to Point/Station 134.000 **** STREET FLOW TRAVEL TIME + SUBAREA FLOW ADDITION **** ______________________________________________________________________ Top of street segment elevation = 1519.100(Ft.)
End of street segment elevation = 1510.100(Ft.)
Length of street segment = 806.000(Ft.)
Height of curb above gutter flowline = 6.0(In.)
Width of half street (curb to crown) = 18.000(Ft.)
Distance from crown to crossfall grade break = 16.000(Ft.) Slope from gutter to grade break (v/hz) = 0.020
Slope from grade break to crown (v/hz) = 0.020
Street flow is on [1] side(s) of the street
Distance from curb to property line = 10.000(Ft.)
Slope from curb to property line (v/hz) = 0.020
Gutter width = 2.000(Ft.)
Gutter hike from flowline = 2.000(In.)
Manning's N in gutter = 0.0130
Manning's N from gutter to grade break = 0.0130
Manning's N from grade break to crown = 0.0130
Estimated mean flow rate at midpoint of street = 11.066(CFS) Depth of flow = 0.464(Ft.), Average velocity = 3.726(Ft/s) Streetflow hydraulics at midpoint of street travel:

Halfstreet flow width = 16.862(Ft.)
Flow velocity = 3.73(Ft/s)
Travel time = 3.61 min. TC = 16.17 min.

Adding area flow to street
SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.855
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.500
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.500
RI index for soil(AMC 3) = 82.30
Pervious area fraction = 0.500; Impervious fraction = 0.500 Rainfall intensity = 2.604(In/Hr) for a 100.0 year storm Subarea runoff = 14.970(CFS) for 6.720(Ac.)
Total runoff = 18.508(CFS) Total area = 8.080(Ac.) Street flow at end of street = 18.508(CFS)
Half street flow at end of street = 18.508(CFS)
Depth of flow = 0.537(Ft.), Average velocity = 4.290(Ft/s) Warning: depth of flow exceeds top of curb
Note: depth of flow exceeds top of street crown.

Distance that curb overflow reaches into property = 1.87(Ft.) Flow width (from curb towards crown)= 18.000(Ft.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 134.000 to Point/Station 129.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1499.400(Ft.)
Downstream point/station elevation = 1499.100(Ft.)
Pipe length = 25.00(Ft.) Manning's N = 0.013
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
No. of pipes = 1 Required pipe flow = 18.508(CFS)
Nearest computed pipe diameter = 21.00(In.)
Calculated individual pipe flow = 18.508(CFS)
Normal flow depth in pipe = 18.90(In.)
Flow top width inside pipe = 12.60(In.)
Critical Depth = 18.72(In.)
Pipe flow velocity = 8.11(Ft/s)
Travel time through pipe = 0.05 min.

Time of concentration (TC) = 16.23 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 134.000 to Point/Station 129.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 3
Stream flow area = 8.080(Ac.)
Runoff from this stream = 18.508(CFS)
Time of concentration = 16.23 min.

Rainfall intensity = 2.600(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 108.312 12.84 2.943
2 5.421 14.87 2.723
3 18.508 16.23 2.600
Largest stream flow has longer or shorter time of concentration Qp = 108.312 + sum of
Qa Tb/Ta

5.421 * 0.864 = 4.681
Qa Tb/Ta

18.508 * 0.792 = 14.650
Qp = 127.643
Total of 3 streams to confluence:

Flow rates before confluence point:
108.312 5.421 18.508
Area of streams before confluence:

49.350 2.340 8.080
Results of confluence:

Total flow rate = 127.643(CFS)
Time of concentration = 12.843 min.

Effective stream area after confluence = 59.770(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 129.000 to Point/Station 135.100 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1499.100(Ft.)
Downstream point/station elevation = 1498.000(Ft.)
Pipe length = 107.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 127.643(CFS)
Nearest computed pipe diameter = 45.00(In.)
Calculated individual pipe flow = 127.643(CFS)
Normal flow depth in pipe = 38.81(In.)
Flow top width inside pipe = 30.99(In.)
Critical Depth = 40.46(In.)
Pipe flow velocity = 12.60(Ft/s)
Travel time through pipe = 0.14 min.

Time of concentration (TC) = 12.98 min.

Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 129.000 to Point/Station 135.100 **** CONFLUENCE OF MAIN STREAMS ****
______________________________________________________________________ The following data inside Main Stream is listed:

In Main Stream number: 1
Stream flow area = 59.770(Ac.)
Runoff from this stream = 127.643(CFS)
Time of concentration = 12.98 min.

Rainfall intensity = 2.926(In/Hr)
Program is now starting with Main Stream No. 2
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 136.000 to Point/Station 137.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 616.000(Ft.)
Top (of initial area) elevation = 1515.100(Ft.)
Bottom (of initial area) elevation = 1506.700(Ft.)
Difference in elevation = 8.400(Ft.)
Slope = 0.01364 s(percent)= 1.36
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 12.021 min.

Rainfall intensity = 3.048(In/Hr) for a 100.0 year storm SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.771
Decimal fraction soil group A = 1.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 3) = 52.00
Pervious area fraction = 0.500; Impervious fraction = 0.500 Initial subarea runoff = 4.204(CFS)
Total initial stream area = 1.790(Ac.)
Pervious area fraction = 0.500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 137.000 to Point/Station 138.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1498.900(Ft.)
Downstream point/station elevation = 1498.400(Ft.)
Pipe length = 47.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 4.204(CFS)
Nearest computed pipe diameter = 15.00(In.)
Calculated individual pipe flow = 4.204(CFS)
Normal flow depth in pipe = 8.65(In.)
Flow top width inside pipe = 14.82(In.)
Critical Depth = 9.96(In.)
Pipe flow velocity = 5.74(Ft/s)
Travel time through pipe = 0.14 min.

Time of concentration (TC) = 12.16 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 137.000 to Point/Station 138.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 2 in normal stream number 1
Stream flow area = 1.790(Ac.)
Runoff from this stream = 4.204(CFS)
Time of concentration = 12.16 min.

Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Rainfall intensity = 3.030(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 139.000 to Point/Station 140.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 701.000(Ft.)
Top (of initial area) elevation = 1512.200(Ft.)
Bottom (of initial area) elevation = 1506.700(Ft.)
Difference in elevation = 5.500(Ft.)
Slope = 0.00785 s(percent)= 0.78
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 14.139 min.

Rainfall intensity = 2.797(In/Hr) for a 100.0 year storm SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.838
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 3) = 74.80
Pervious area fraction = 0.500; Impervious fraction = 0.500 Initial subarea runoff = 5.529(CFS)
Total initial stream area = 2.360(Ac.)
Pervious area fraction = 0.500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 140.000 to Point/Station 138.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1498.600(Ft.)
Downstream point/station elevation = 1498.400(Ft.)
Pipe length = 10.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 5.529(CFS)
Nearest computed pipe diameter = 15.00(In.)
Calculated individual pipe flow = 5.529(CFS)
Normal flow depth in pipe = 8.42(In.)
Flow top width inside pipe = 14.89(In.)
Critical Depth = 11.43(In.)
Pipe flow velocity = 7.80(Ft/s)
Travel time through pipe = 0.02 min.

Time of concentration (TC) = 14.16 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 140.000 to Point/Station 138.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 2 in normal stream number 2
Stream flow area = 2.360(Ac.)
Runoff from this stream = 5.529(CFS)
Time of concentration = 14.16 min.

Rainfall intensity = 2.794(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 4.204 12.16 3.030
2 5.529 14.16 2.794
Largest stream flow has longer time of concentration
Qp = 5.529 + sum of
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Qb Ia/Ib

4.204 * 0.922 = 3.877
Qp = 9.407
Total of 2 streams to confluence:

Flow rates before confluence point:

4.204 5.529
Area of streams before confluence:

1.790 2.360
Results of confluence:

Total flow rate = 9.407(CFS)
Time of concentration = 14.161 min.

Effective stream area after confluence = 4.150(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 138.000 to Point/Station 135.200 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1498.400(Ft.)
Downstream point/station elevation = 1498.000(Ft.)
Pipe length = 40.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 9.407(CFS)
Nearest computed pipe diameter = 18.00(In.)
Calculated individual pipe flow = 9.407(CFS)
Normal flow depth in pipe = 13.29(In.)
Flow top width inside pipe = 15.82(In.)
Critical Depth = 14.22(In.)
Pipe flow velocity = 6.72(Ft/s)
Travel time through pipe = 0.10 min.

Time of concentration (TC) = 14.26 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 138.000 to Point/Station 135.200 **** CONFLUENCE OF MAIN STREAMS ****
______________________________________________________________________ The following data inside Main Stream is listed:

In Main Stream number: 2
Stream flow area = 4.150(Ac.)
Runoff from this stream = 9.407(CFS)
Time of concentration = 14.26 min.

Rainfall intensity = 2.784(In/Hr)
Program is now starting with Main Stream No. 3
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 146.000 to Point/Station 147.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 1000.000(Ft.)
Top (of initial area) elevation = 1744.000(Ft.)
Bottom (of initial area) elevation = 1579.000(Ft.)
Difference in elevation = 165.000(Ft.)
Slope = 0.16500 s(percent)= 16.50
TC = k(0.530)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 12.044 min.

Rainfall intensity = 3.045(In/Hr) for a 100.0 year storm UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.857
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 3) = 89.80
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Pervious area fraction = 1.000; Impervious fraction = 0.000 Initial subarea runoff = 11.147(CFS)
Total initial stream area = 4.270(Ac.)
Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 147.000 to Point/Station 148.000 **** IMPROVED CHANNEL TRAVEL TIME ****
______________________________________________________________________ Upstream point elevation = 1579.000(Ft.)
Downstream point elevation = 1568.000(Ft.)
Channel length thru subarea = 185.000(Ft.)
Channel base width = 0.000(Ft.)
Slope or 'Z' of left channel bank = 1.000
Slope or 'Z' of right channel bank = 1.000
Estimated mean flow rate at midpoint of channel = 12.138(CFS) Manning's 'N' = 0.013
Maximum depth of channel = 1.500(Ft.)
Flow(q) thru subarea = 12.138(CFS)
Depth of flow = 0.950(Ft.), Average velocity = 13.463(Ft/s) Channel flow top width = 1.899(Ft.)
Flow Velocity = 13.46(Ft/s)
Travel time = 0.23 min.

Time of concentration = 12.27 min.

Sub-Channel No. 1 Critical depth = 1.547(Ft.)
' ' ' Critical flow top width = 3.000(Ft.) ' ' ' Critical flow velocity= 5.078(Ft/s) ' ' ' Critical flow area = 2.391(Sq.Ft) Adding area flow to channel
UNDEVELOPED (fair cover) subarea
Runoff Coefficient = 0.832
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 3) = 84.40
Pervious area fraction = 1.000; Impervious fraction = 0.000 Rainfall intensity = 3.014(In/Hr) for a 100.0 year storm Subarea runoff = 1.906(CFS) for 0.760(Ac.)
Total runoff = 13.053(CFS) Total area = 5.030(Ac.) Depth of flow = 0.976(Ft.), Average velocity = 13.710(Ft/s) Sub-Channel No. 1 Critical depth = 1.586(Ft.)
' ' ' Critical flow top width = 3.000(Ft.) ' ' ' Critical flow velocity= 5.205(Ft/s) ' ' ' Critical flow area = 2.508(Sq.Ft) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 147.000 to Point/Station 148.000 **** SUBAREA FLOW ADDITION ****
______________________________________________________________________ UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.857
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 3) = 89.80
Pervious area fraction = 1.000; Impervious fraction = 0.000 Time of concentration = 12.27 min.

Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Rainfall intensity = 3.014(In/Hr) for a 100.0 year storm Subarea runoff = 6.200(CFS) for 2.400(Ac.)
Total runoff = 19.252(CFS) Total area = 7.430(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 148.000 to Point/Station 149.000 **** IMPROVED CHANNEL TRAVEL TIME ****
______________________________________________________________________ Upstream point elevation = 1568.000(Ft.)
Downstream point elevation = 1560.000(Ft.)
Channel length thru subarea = 220.000(Ft.)
Channel base width = 0.000(Ft.)
Slope or 'Z' of left channel bank = 1.000
Slope or 'Z' of right channel bank = 1.000
Estimated mean flow rate at midpoint of channel = 19.771(CFS) Manning's 'N' = 0.013
Maximum depth of channel = 1.500(Ft.)
Flow(q) thru subarea = 19.771(CFS)
Depth of flow = 1.250(Ft.), Average velocity = 12.649(Ft/s) Channel flow top width = 2.500(Ft.)
Flow Velocity = 12.65(Ft/s)
Travel time = 0.29 min.

Time of concentration = 12.56 min.

Sub-Channel No. 1 Critical depth = 1.859(Ft.)
' ' ' Critical flow top width = 3.000(Ft.) ' ' ' Critical flow velocity= 5.940(Ft/s) ' ' ' Critical flow area = 3.328(Sq.Ft) Adding area flow to channel
UNDEVELOPED (fair cover) subarea
Runoff Coefficient = 0.831
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 3) = 84.40
Pervious area fraction = 1.000; Impervious fraction = 0.000 Rainfall intensity = 2.977(In/Hr) for a 100.0 year storm Subarea runoff = 0.990(CFS) for 0.400(Ac.)
Total runoff = 20.242(CFS) Total area = 7.830(Ac.) Depth of flow = 1.261(Ft.), Average velocity = 12.723(Ft/s) Sub-Channel No. 1 Critical depth = 1.875(Ft.)
' ' ' Critical flow top width = 3.000(Ft.) ' ' ' Critical flow velocity= 5.998(Ft/s) ' ' ' Critical flow area = 3.375(Sq.Ft) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 149.000 to Point/Station 150.000 **** IMPROVED CHANNEL TRAVEL TIME ****
______________________________________________________________________ Upstream point elevation = 1560.000(Ft.)
Downstream point elevation = 1555.000(Ft.)
Channel length thru subarea = 190.000(Ft.)
Channel base width = 0.000(Ft.)
Slope or 'Z' of left channel bank = 1.000
Slope or 'Z' of right channel bank = 1.000
Estimated mean flow rate at midpoint of channel = 21.512(CFS) Manning's 'N' = 0.013
Maximum depth of channel = 1.500(Ft.)
Flow(q) thru subarea = 21.512(CFS)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Depth of flow = 1.371(Ft.), Average velocity = 11.443(Ft/s) Channel flow top width = 2.742(Ft.)
Flow Velocity = 11.44(Ft/s)
Travel time = 0.28 min.

Time of concentration = 12.84 min.

Sub-Channel No. 1 Critical depth = 1.922(Ft.)
' ' ' Critical flow top width = 3.000(Ft.) ' ' ' Critical flow velocity= 6.119(Ft/s) ' ' ' Critical flow area = 3.516(Sq.Ft) Adding area flow to channel
UNDEVELOPED (fair cover) subarea
Runoff Coefficient = 0.830
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 3) = 84.40
Pervious area fraction = 1.000; Impervious fraction = 0.000 Rainfall intensity = 2.943(In/Hr) for a 100.0 year storm Subarea runoff = 2.469(CFS) for 1.010(Ac.)
Total runoff = 22.711(CFS) Total area = 8.840(Ac.) Depth of flow = 1.399(Ft.), Average velocity = 11.599(Ft/s) Sub-Channel No. 1 Critical depth = 1.969(Ft.)
' ' ' Critical flow top width = 3.000(Ft.) ' ' ' Critical flow velocity= 6.212(Ft/s) ' ' ' Critical flow area = 3.656(Sq.Ft) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 149.000 to Point/Station 150.000 **** SUBAREA FLOW ADDITION ****
______________________________________________________________________ UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.856
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 3) = 89.80
Pervious area fraction = 1.000; Impervious fraction = 0.000 Time of concentration = 12.84 min.

Rainfall intensity = 2.943(In/Hr) for a 100.0 year storm Subarea runoff = 8.566(CFS) for 3.400(Ac.)
Total runoff = 31.277(CFS) Total area = 12.240(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 150.000 to Point/Station 151.000 **** IMPROVED CHANNEL TRAVEL TIME ****
______________________________________________________________________ Upstream point elevation = 1555.000(Ft.)
Downstream point elevation = 1536.000(Ft.)
Channel length thru subarea = 330.000(Ft.)
Channel base width = 0.000(Ft.)
Slope or 'Z' of left channel bank = 1.000
Slope or 'Z' of right channel bank = 1.000
Estimated mean flow rate at midpoint of channel = 31.915(CFS) Manning's 'N' = 0.013
Maximum depth of channel = 1.500(Ft.)
Flow(q) thru subarea = 31.915(CFS)
Depth of flow = 1.373(Ft.), Average velocity = 16.938(Ft/s) Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Channel flow top width = 2.745(Ft.)
Flow Velocity = 16.94(Ft/s)
Travel time = 0.32 min.

Time of concentration = 13.16 min.

Sub-Channel No. 1 Critical depth = 2.266(Ft.)
' ' ' Critical flow top width = 3.000(Ft.) ' ' ' Critical flow velocity= 7.019(Ft/s) ' ' ' Critical flow area = 4.547(Sq.Ft) Adding area flow to channel
UNDEVELOPED (fair cover) subarea
Runoff Coefficient = 0.830
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 3) = 84.40
Pervious area fraction = 1.000; Impervious fraction = 0.000 Rainfall intensity = 2.905(In/Hr) for a 100.0 year storm Subarea runoff = 1.205(CFS) for 0.500(Ac.)
Total runoff = 32.481(CFS) Total area = 12.740(Ac.) Depth of flow = 1.382(Ft.), Average velocity = 17.013(Ft/s) Sub-Channel No. 1 Critical depth = 2.281(Ft.)
' ' ' Critical flow top width = 3.000(Ft.) ' ' ' Critical flow velocity= 7.071(Ft/s) ' ' ' Critical flow area = 4.594(Sq.Ft) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 151.000 to Point/Station 152.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1534.000(Ft.)
Downstream point/station elevation = 1533.000(Ft.)
Pipe length = 104.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 32.481(CFS)
Nearest computed pipe diameter = 30.00(In.)
Calculated individual pipe flow = 32.481(CFS)
Normal flow depth in pipe = 20.44(In.)
Flow top width inside pipe = 27.96(In.)
Critical Depth = 23.27(In.)
Pipe flow velocity = 9.12(Ft/s)
Travel time through pipe = 0.19 min.

Time of concentration (TC) = 13.35 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 151.000 to Point/Station 152.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 3 in normal stream number 1
Stream flow area = 12.740(Ac.)
Runoff from this stream = 32.481(CFS)
Time of concentration = 13.35 min.

Rainfall intensity = 2.883(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 153.000 to Point/Station 152.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 727.000(Ft.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Top (of initial area) elevation = 1707.000(Ft.)
Bottom (of initial area) elevation = 1537.000(Ft.)
Difference in elevation = 170.000(Ft.)
Slope = 0.23384 s(percent)= 23.38
TC = k(0.530)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 9.888 min.

Rainfall intensity = 3.380(In/Hr) for a 100.0 year storm UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.874
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.500
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.500
RI index for soil(AMC 3) = 93.10
Pervious area fraction = 1.000; Impervious fraction = 0.000 Initial subarea runoff = 10.050(CFS)
Total initial stream area = 3.400(Ac.)
Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 153.000 to Point/Station 152.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 3 in normal stream number 2
Stream flow area = 3.400(Ac.)
Runoff from this stream = 10.050(CFS)
Time of concentration = 9.89 min.

Rainfall intensity = 3.380(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 32.481 13.35 2.883
2 10.050 9.89 3.380
Largest stream flow has longer time of concentration
Qp = 32.481 + sum of
Qb Ia/Ib

10.050 * 0.853 = 8.570
Qp = 41.052
Total of 2 streams to confluence:

Flow rates before confluence point:

32.481 10.050
Area of streams before confluence:

12.740 3.400
Results of confluence:

Total flow rate = 41.052(CFS)
Time of concentration = 13.355 min.

Effective stream area after confluence = 16.140(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 152.000 to Point/Station 154.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1533.000(Ft.)
Downstream point/station elevation = 1519.500(Ft.)
Pipe length = 440.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 41.052(CFS)
Nearest computed pipe diameter = 24.00(In.)
Calculated individual pipe flow = 41.052(CFS)
Normal flow depth in pipe = 20.53(In.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Flow top width inside pipe = 16.88(In.)
Critical depth could not be calculated.

Pipe flow velocity = 14.34(Ft/s)
Travel time through pipe = 0.51 min.

Time of concentration (TC) = 13.87 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 152.000 to Point/Station 154.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 3 in normal stream number 1
Stream flow area = 16.140(Ac.)
Runoff from this stream = 41.052(CFS)
Time of concentration = 13.87 min.

Rainfall intensity = 2.826(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 155.000 to Point/Station 156.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 320.000(Ft.)
Top (of initial area) elevation = 1575.000(Ft.)
Bottom (of initial area) elevation = 1528.000(Ft.)
Difference in elevation = 47.000(Ft.)
Slope = 0.14688 s(percent)= 14.69
TC = k(0.710)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 10.470 min.

Rainfall intensity = 3.279(In/Hr) for a 100.0 year storm UNDEVELOPED (fair cover) subarea
Runoff Coefficient = 0.875
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 1.000
RI index for soil(AMC 3) = 93.40
Pervious area fraction = 1.000; Impervious fraction = 0.000 Initial subarea runoff = 1.578(CFS)
Total initial stream area = 0.550(Ac.)
Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 156.000 to Point/Station 154.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1528.000(Ft.)
Downstream point/station elevation = 1519.500(Ft.)
Pipe length = 36.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 1.578(CFS)
Nearest computed pipe diameter = 6.00(In.)
Calculated individual pipe flow = 1.578(CFS)
Normal flow depth in pipe = 3.28(In.)
Flow top width inside pipe = 5.97(In.)
Critical depth could not be calculated.

Pipe flow velocity = 14.39(Ft/s)
Travel time through pipe = 0.04 min.

Time of concentration (TC) = 10.51 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 156.000 to Point/Station 154.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Along Main Stream number: 3 in normal stream number 2
Stream flow area = 0.550(Ac.)
Runoff from this stream = 1.578(CFS)
Time of concentration = 10.51 min.

Rainfall intensity = 3.273(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 41.052 13.87 2.826
2 1.578 10.51 3.273
Largest stream flow has longer time of concentration
Qp = 41.052 + sum of
Qb Ia/Ib

1.578 * 0.863 = 1.363
Qp = 42.414
Total of 2 streams to confluence:

Flow rates before confluence point:

41.052 1.578
Area of streams before confluence:

16.140 0.550
Results of confluence:

Total flow rate = 42.414(CFS)
Time of concentration = 13.866 min.

Effective stream area after confluence = 16.690(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 154.000 to Point/Station 157.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1519.500(Ft.)
Downstream point/station elevation = 1509.800(Ft.)
Pipe length = 660.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 42.414(CFS)
Nearest computed pipe diameter = 30.00(In.)
Calculated individual pipe flow = 42.414(CFS)
Normal flow depth in pipe = 21.30(In.)
Flow top width inside pipe = 27.22(In.)
Critical Depth = 26.13(In.)
Pipe flow velocity = 11.38(Ft/s)
Travel time through pipe = 0.97 min.

Time of concentration (TC) = 14.83 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 154.000 to Point/Station 157.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 3 in normal stream number 1
Stream flow area = 16.690(Ac.)
Runoff from this stream = 42.414(CFS)
Time of concentration = 14.83 min.

Rainfall intensity = 2.727(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 158.000 to Point/Station 159.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 442.000(Ft.)
Top (of initial area) elevation = 1640.000(Ft.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Bottom (of initial area) elevation = 1535.000(Ft.)
Difference in elevation = 105.000(Ft.)
Slope = 0.23756 s(percent)= 23.76
TC = k(0.530)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 8.078 min.

Rainfall intensity = 3.763(In/Hr) for a 100.0 year storm UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.881
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 1.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 3) = 94.40
Pervious area fraction = 1.000; Impervious fraction = 0.000 Initial subarea runoff = 6.799(CFS)
Total initial stream area = 2.050(Ac.)
Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 159.000 to Point/Station 157.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1533.000(Ft.)
Downstream point/station elevation = 1509.800(Ft.)
Pipe length = 65.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 6.799(CFS)
Nearest computed pipe diameter = 9.00(In.)
Calculated individual pipe flow = 6.799(CFS)
Normal flow depth in pipe = 5.48(In.)
Flow top width inside pipe = 8.78(In.)
Critical depth could not be calculated.

Pipe flow velocity = 24.12(Ft/s)
Travel time through pipe = 0.04 min.

Time of concentration (TC) = 8.12 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 159.000 to Point/Station 157.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 3 in normal stream number 2
Stream flow area = 2.050(Ac.)
Runoff from this stream = 6.799(CFS)
Time of concentration = 8.12 min.

Rainfall intensity = 3.752(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 42.414 14.83 2.727
2 6.799 8.12 3.752
Largest stream flow has longer time of concentration
Qp = 42.414 + sum of
Qb Ia/Ib

6.799 * 0.727 = 4.941
Qp = 47.355
Total of 2 streams to confluence:

Flow rates before confluence point:

42.414 6.799
Area of streams before confluence:

16.690 2.050
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Results of confluence:

Total flow rate = 47.355(CFS)
Time of concentration = 14.833 min.

Effective stream area after confluence = 18.740(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 157.000 to Point/Station 160.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1509.800(Ft.)
Downstream point/station elevation = 1503.800(Ft.)
Pipe length = 307.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 47.355(CFS)
Nearest computed pipe diameter = 30.00(In.)
Calculated individual pipe flow = 47.355(CFS)
Normal flow depth in pipe = 20.79(In.)
Flow top width inside pipe = 27.68(In.)
Critical Depth = 27.16(In.)
Pipe flow velocity = 13.05(Ft/s)
Travel time through pipe = 0.39 min.

Time of concentration (TC) = 15.23 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 157.000 to Point/Station 160.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 3 in normal stream number 1
Stream flow area = 18.740(Ac.)
Runoff from this stream = 47.355(CFS)
Time of concentration = 15.23 min.

Rainfall intensity = 2.689(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 161.000 to Point/Station 162.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 570.000(Ft.)
Top (of initial area) elevation = 1630.000(Ft.)
Bottom (of initial area) elevation = 1535.000(Ft.)
Difference in elevation = 95.000(Ft.)
Slope = 0.16667 s(percent)= 16.67
TC = k(0.530)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 9.600 min.

Rainfall intensity = 3.434(In/Hr) for a 100.0 year storm UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.875
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.500
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.500
RI index for soil(AMC 3) = 93.10
Pervious area fraction = 1.000; Impervious fraction = 0.000 Initial subarea runoff = 4.987(CFS)
Total initial stream area = 1.660(Ac.)
Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 162.000 to Point/Station 160.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1533.000(Ft.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Downstream point/station elevation = 1503.800(Ft.)
Pipe length = 72.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 4.987(CFS)
Nearest computed pipe diameter = 9.00(In.)
Calculated individual pipe flow = 4.987(CFS)
Normal flow depth in pipe = 4.36(In.)
Flow top width inside pipe = 9.00(In.)
Critical depth could not be calculated.

Pipe flow velocity = 23.52(Ft/s)
Travel time through pipe = 0.05 min.

Time of concentration (TC) = 9.65 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 162.000 to Point/Station 160.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 3 in normal stream number 2
Stream flow area = 1.660(Ac.)
Runoff from this stream = 4.987(CFS)
Time of concentration = 9.65 min.

Rainfall intensity = 3.424(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 47.355 15.23 2.689
2 4.987 9.65 3.424
Largest stream flow has longer time of concentration
Qp = 47.355 + sum of
Qb Ia/Ib

4.987 * 0.785 = 3.916
Qp = 51.272
Total of 2 streams to confluence:

Flow rates before confluence point:

47.355 4.987
Area of streams before confluence:

18.740 1.660
Results of confluence:

Total flow rate = 51.272(CFS)
Time of concentration = 15.225 min.

Effective stream area after confluence = 20.400(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 160.000 to Point/Station 135.200 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1503.800(Ft.)
Downstream point/station elevation = 1498.000(Ft.)
Pipe length = 256.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 51.272(CFS)
Nearest computed pipe diameter = 30.00(In.)
Calculated individual pipe flow = 51.272(CFS)
Normal flow depth in pipe = 20.86(In.)
Flow top width inside pipe = 27.62(In.)
Critical Depth = 27.77(In.)
Pipe flow velocity = 14.06(Ft/s)
Travel time through pipe = 0.30 min.

Time of concentration (TC) = 15.53 min.

Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 160.000 to Point/Station 135.200 **** CONFLUENCE OF MAIN STREAMS ****
______________________________________________________________________ The following data inside Main Stream is listed:

In Main Stream number: 3
Stream flow area = 20.400(Ac.)
Runoff from this stream = 51.272(CFS)
Time of concentration = 15.53 min.

Rainfall intensity = 2.661(In/Hr)
Program is now starting with Main Stream No. 4
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 128.000 to Point/Station 140.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 580.000(Ft.)
Top (of initial area) elevation = 1529.800(Ft.)
Bottom (of initial area) elevation = 1523.300(Ft.)
Difference in elevation = 6.500(Ft.)
Slope = 0.01121 s(percent)= 1.12
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 12.205 min.

Rainfall intensity = 3.023(In/Hr) for a 100.0 year storm SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.874
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 1.000
RI index for soil(AMC 3) = 88.00
Pervious area fraction = 0.500; Impervious fraction = 0.500 Initial subarea runoff = 3.437(CFS)
Total initial stream area = 1.300(Ac.)
Pervious area fraction = 0.500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 140.000 to Point/Station 141.000 **** STREET FLOW TRAVEL TIME + SUBAREA FLOW ADDITION **** ______________________________________________________________________ Top of street segment elevation = 1523.300(Ft.)
End of street segment elevation = 1504.000(Ft.)
Length of street segment = 1420.000(Ft.)
Height of curb above gutter flowline = 8.0(In.)
Width of half street (curb to crown) = 38.000(Ft.)
Distance from crown to crossfall grade break = 20.000(Ft.) Slope from gutter to grade break (v/hz) = 0.020
Slope from grade break to crown (v/hz) = 0.020
Street flow is on [1] side(s) of the street
Distance from curb to property line = 40.000(Ft.)
Slope from curb to property line (v/hz) = 0.020
Gutter width = 2.000(Ft.)
Gutter hike from flowline = 2.000(In.)
Manning's N in gutter = 0.0130
Manning's N from gutter to grade break = 0.0130
Manning's N from grade break to crown = 0.0130
Estimated mean flow rate at midpoint of street = 6.701(CFS) Depth of flow = 0.392(Ft.), Average velocity = 3.558(Ft/s) Streetflow hydraulics at midpoint of street travel:

Halfstreet flow width = 13.255(Ft.)
Flow velocity = 3.56(Ft/s)
Travel time = 6.65 min. TC = 18.86 min.

Adding area flow to street
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.852
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.500
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.500
RI index for soil(AMC 3) = 82.30
Pervious area fraction = 0.500; Impervious fraction = 0.500 Rainfall intensity = 2.401(In/Hr) for a 100.0 year storm Subarea runoff = 6.464(CFS) for 3.160(Ac.)
Total runoff = 9.901(CFS) Total area = 4.460(Ac.) Street flow at end of street = 9.901(CFS)
Half street flow at end of street = 9.901(CFS)
Depth of flow = 0.437(Ft.), Average velocity = 3.907(Ft/s) Flow width (from curb towards crown)= 15.516(Ft.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 141.000 to Point/Station 142.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1498.800(Ft.)
Downstream point/station elevation = 1498.000(Ft.)
Pipe length = 70.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 9.901(CFS)
Nearest computed pipe diameter = 18.00(In.)
Calculated individual pipe flow = 9.901(CFS)
Normal flow depth in pipe = 13.13(In.)
Flow top width inside pipe = 16.00(In.)
Critical Depth = 14.55(In.)
Pipe flow velocity = 7.17(Ft/s)
Travel time through pipe = 0.16 min.

Time of concentration (TC) = 19.02 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 141.000 to Point/Station 142.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 4 in normal stream number 1
Stream flow area = 4.460(Ac.)
Runoff from this stream = 9.901(CFS)
Time of concentration = 19.02 min.

Rainfall intensity = 2.390(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 117.000 to Point/Station 143.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ Initial area flow distance = 722.000(Ft.)
Top (of initial area) elevation = 1543.800(Ft.)
Bottom (of initial area) elevation = 1537.300(Ft.)
Difference in elevation = 6.500(Ft.)
Slope = 0.00900 s(percent)= 0.90
TC = k(0.390)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 13.919 min.

Rainfall intensity = 2.820(In/Hr) for a 100.0 year storm SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.858
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.500
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.500
RI index for soil(AMC 3) = 82.30
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Pervious area fraction = 0.500; Impervious fraction = 0.500 Initial subarea runoff = 2.784(CFS)
Total initial stream area = 1.150(Ac.)
Pervious area fraction = 0.500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 143.000 to Point/Station 144.000 **** STREET FLOW TRAVEL TIME + SUBAREA FLOW ADDITION **** ______________________________________________________________________ Top of street segment elevation = 1537.300(Ft.)
End of street segment elevation = 1528.600(Ft.)
Length of street segment = 863.000(Ft.)
Height of curb above gutter flowline = 8.0(In.)
Width of half street (curb to crown) = 38.000(Ft.)
Distance from crown to crossfall grade break = 20.000(Ft.) Slope from gutter to grade break (v/hz) = 0.020
Slope from grade break to crown (v/hz) = 0.020
Street flow is on [1] side(s) of the street
Distance from curb to property line = 40.000(Ft.)
Slope from curb to property line (v/hz) = 0.020
Gutter width = 2.000(Ft.)
Gutter hike from flowline = 2.000(In.)
Manning's N in gutter = 0.0130
Manning's N from gutter to grade break = 0.0130
Manning's N from grade break to crown = 0.0130
Estimated mean flow rate at midpoint of street = 4.169(CFS) Depth of flow = 0.358(Ft.), Average velocity = 2.837(Ft/s) Streetflow hydraulics at midpoint of street travel:

Halfstreet flow width = 11.587(Ft.)
Flow velocity = 2.84(Ft/s)
Travel time = 5.07 min. TC = 18.99 min.

Adding area flow to street
SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.865
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.100
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.900
RI index for soil(AMC 3) = 86.86
Pervious area fraction = 0.500; Impervious fraction = 0.500 Rainfall intensity = 2.392(In/Hr) for a 100.0 year storm Subarea runoff = 2.711(CFS) for 1.310(Ac.)
Total runoff = 5.495(CFS) Total area = 2.460(Ac.) Street flow at end of street = 5.495(CFS)
Half street flow at end of street = 5.495(CFS)
Depth of flow = 0.386(Ft.), Average velocity = 3.028(Ft/s) Flow width (from curb towards crown)= 12.991(Ft.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 144.000 to Point/Station 145.000 **** STREET FLOW TRAVEL TIME + SUBAREA FLOW ADDITION **** ______________________________________________________________________ Top of street segment elevation = 1528.600(Ft.)
End of street segment elevation = 1498.100(Ft.)
Length of street segment = 1850.000(Ft.)
Height of curb above gutter flowline = 8.0(In.)
Width of half street (curb to crown) = 38.000(Ft.)
Distance from crown to crossfall grade break = 20.000(Ft.) Slope from gutter to grade break (v/hz) = 0.020
Slope from grade break to crown (v/hz) = 0.020
Street flow is on [1] side(s) of the street
Distance from curb to property line = 40.000(Ft.)
Slope from curb to property line (v/hz) = 0.020
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Gutter width = 2.000(Ft.)
Gutter hike from flowline = 2.000(In.)
Manning's N in gutter = 0.0130
Manning's N from gutter to grade break = 0.0130
Manning's N from grade break to crown = 0.0130
Estimated mean flow rate at midpoint of street = 7.919(CFS) Depth of flow = 0.399(Ft.), Average velocity = 3.985(Ft/s) Streetflow hydraulics at midpoint of street travel:

Halfstreet flow width = 13.641(Ft.)
Flow velocity = 3.98(Ft/s)
Travel time = 7.74 min. TC = 26.73 min.

Adding area flow to street
SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.843
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.500
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.500
RI index for soil(AMC 3) = 82.30
Pervious area fraction = 0.500; Impervious fraction = 0.500 Rainfall intensity = 1.996(In/Hr) for a 100.0 year storm Subarea runoff = 4.797(CFS) for 2.850(Ac.)
Total runoff = 10.292(CFS) Total area = 5.310(Ac.) Street flow at end of street = 10.292(CFS)
Half street flow at end of street = 10.292(CFS)
Depth of flow = 0.430(Ft.), Average velocity = 4.243(Ft/s) Flow width (from curb towards crown)= 15.161(Ft.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 145.000 to Point/Station 142.000 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1498.600(Ft.)
Downstream point/station elevation = 1498.100(Ft.)
Pipe length = 50.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 10.292(CFS)
Nearest computed pipe diameter = 18.00(In.)
Calculated individual pipe flow = 10.292(CFS)
Normal flow depth in pipe = 14.44(In.)
Flow top width inside pipe = 14.34(In.)
Critical Depth = 14.81(In.)
Pipe flow velocity = 6.78(Ft/s)
Travel time through pipe = 0.12 min.

Time of concentration (TC) = 26.85 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 145.000 to Point/Station 142.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 4 in normal stream number 2
Stream flow area = 5.310(Ac.)
Runoff from this stream = 10.292(CFS)
Time of concentration = 26.85 min.

Rainfall intensity = 1.991(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 9.901 19.02 2.390
2 10.292 26.85 1.991
Largest stream flow has longer time of concentration
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Qp = 10.292 + sum of
Qb Ia/Ib

9.901 * 0.833 = 8.247
Qp = 18.539
Total of 2 streams to confluence:

Flow rates before confluence point:

9.901 10.292
Area of streams before confluence:

4.460 5.310
Results of confluence:

Total flow rate = 18.539(CFS)
Time of concentration = 26.850 min.

Effective stream area after confluence = 9.770(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 142.000 to Point/Station 134.400 **** PIPEFLOW TRAVEL TIME (Program estimated size) **** ______________________________________________________________________ Upstream point/station elevation = 1498.100(Ft.)
Downstream point/station elevation = 1496.000(Ft.)
Pipe length = 116.00(Ft.) Manning's N = 0.013
No. of pipes = 1 Required pipe flow = 18.539(CFS)
Nearest computed pipe diameter = 21.00(In.)
Calculated individual pipe flow = 18.539(CFS)
Normal flow depth in pipe = 15.14(In.)
Flow top width inside pipe = 18.84(In.)
Critical Depth = 18.72(In.)
Pipe flow velocity = 9.98(Ft/s)
Travel time through pipe = 0.19 min.

Time of concentration (TC) = 27.04 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 142.000 to Point/Station 134.400 **** CONFLUENCE OF MAIN STREAMS ****
______________________________________________________________________ The following data inside Main Stream is listed:

In Main Stream number: 4
Stream flow area = 9.770(Ac.)
Runoff from this stream = 18.539(CFS)
Time of concentration = 27.04 min.

Rainfall intensity = 1.983(In/Hr)
Summary of stream data:

Stream Flow rate TC Rainfall Intensity No. (CFS) (min) (In/Hr)
1 127.643 12.98 2.926
2 9.407 14.26 2.784
3 51.272 15.53 2.661
4 18.539 27.04 1.983
Largest stream flow has longer or shorter time of concentration Qp = 127.643 + sum of
Qa Tb/Ta

9.407 * 0.911 = 8.566
Qa Tb/Ta

51.272 * 0.836 = 42.873
Qa Tb/Ta

18.539 * 0.480 = 8.902
Qp = 187.984
Total of 4 main streams to confluence:

Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Flow rates before confluence point:
127.643 9.407 51.272 18.539
Area of streams before confluence:

59.770 4.150 20.400 9.770
Results of confluence:

Total flow rate = 187.984(CFS)
Time of concentration = 12.985 min.

Effective stream area after confluence = 94.090(Ac.) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 142.000 to Point/Station 134.400 **** SUBAREA FLOW ADDITION ****
______________________________________________________________________ UNDEVELOPED (fair cover) subarea
Runoff Coefficient = 0.830
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 3) = 84.40
Pervious area fraction = 1.000; Impervious fraction = 0.000 Time of concentration = 12.98 min.

Rainfall intensity = 2.926(In/Hr) for a 100.0 year storm Subarea runoff = 4.347(CFS) for 1.790(Ac.)
Total runoff = 192.331(CFS) Total area = 95.880(Ac.) End of computations, total study area = 95.88 (Ac.) The following figures may
be used for a unit hydrograph study of the same area.

Area averaged pervious area fraction(Ap) = 0.724
Area averaged RI index number = 70.6
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
· Area ‘A’ – 2 Year - Pre-Development Condition – Unit Hydrograph Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
U n i t H y d r o g r a p h A n a l y s i s
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2014, Version 9.0 Study date 05/18/21 File: EXA00212.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6406
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- TRACT 31194 - GOLDEN MEADOWS HYDROLOGY STUDY – AREA ‘A’ EXISTING CONDITION 'OVERALL' UNIT HYDROGRAPH - 2 YEAR 1 HOUR STORM HUNSAKER & ASSOCIATES, FEBRUARY 2019
BY: BRIAN LOWELL, PE
-------------------------------------------------------------------- Drainage Area = 173.20(Ac.) = 0.271 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 173.20(Ac.) = 0.271 Sq. Mi.

Length along longest watercourse = 4753.00(Ft.)
Length along longest watercourse measured to centroid = 1892.00(Ft.) Length along longest watercourse = 0.900 Mi.

Length along longest watercourse measured to centroid = 0.358 Mi.

Difference in elevation = 254.00(Ft.)
Slope along watercourse = 282.1628 Ft./Mi.

Average Manning's 'N' = 0.030
Lag time = 0.160 Hr.

Lag time = 9.62 Min.
25% of lag time = 2.40 Min.
40% of lag time = 3.85 Min.

Unit time = 5.00 Min.

Duration of storm = 1 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]
173.20 0.55 95.26
100 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]
173.20 1.30 225.16
STORM EVENT (YEAR) = 2.00
Area Averaged 2-Year Rainfall = 0.550(In)
Area Averaged 100-Year Rainfall = 1.300(In)
Point rain (area averaged) = 0.550(In)
Areal adjustment factor = 99.84 %
Adjusted average point rain = 0.549(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %
173.200 83.70 0.000
Total Area Entered = 173.20(Ac.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

83.7 68.2 0.382 0.000 0.382 1.000 0.382 Sum (F) = 0.382
Area averaged mean soil loss (F) (In/Hr) = 0.382
Minimum soil loss rate ((In/Hr)) = 0.191
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.900
--------------------------------------------------------------------- Slope of intensity-duration curve for a 1 hour storm =0.5300 ---------------------------------------------------------------------- U n i t H y d r o g r a p h
VALLEY S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 51.976 6.505 11.355 2 0.167 103.953 27.811 48.545 3 0.250 155.929 28.601 49.924 4 0.333 207.905 12.284 21.442 5 0.417 259.881 6.621 11.557 6 0.500 311.858 4.609 8.046 7 0.583 363.834 3.310 5.778 8 0.667 415.810 2.482 4.332 9 0.750 467.787 1.808 3.156 10 0.833 519.763 1.552 2.709 11 0.917 571.739 1.205 2.104 12 1.000 623.715 0.949 1.657 13 1.083 675.692 0.733 1.279 14 1.167 727.668 0.546 0.954 15 1.250 779.644 0.520 0.907 16 1.333 831.621 0.463 0.809 Sum = 100.000 Sum= 174.553
----------------------------------------------------------------------- The following loss rate calculations reflect use of the minimum calculated loss rate subtracted from the Storm Rain to produce the maximum Effective Rain value Unit Time Pattern Storm Rain Loss rate(In./Hr) Effective (Hr.) Percent (In/Hr) Max | Low (In/Hr) 1 0.08 3.40 0.224 ( 0.382) 0.202 0.022 2 0.17 4.70 0.310 ( 0.382) 0.279 0.031 3 0.25 4.70 0.310 ( 0.382) 0.279 0.031 4 0.33 5.10 0.336 ( 0.382) 0.302 0.034 5 0.42 5.80 0.382 ( 0.382) 0.344 0.038 6 0.50 5.90 0.389 ( 0.382) 0.350 0.039 7 0.58 7.10 0.468 0.382 ( 0.421) 0.086 8 0.67 8.70 0.573 0.382 ( 0.516) 0.192 9 0.75 13.20 0.870 0.382 ( 0.783) 0.488 10 0.83 29.70 1.957 0.382 ( 1.761) 1.575 11 0.92 7.70 0.507 0.382 ( 0.457) 0.126 12 1.00 4.00 0.264 ( 0.382) 0.237 0.026 (Loss Rate Not Used)
Sum = 100.0 Sum = 2.7 Flood volume = Effective rainfall 0.22(In)
times area 173.2(Ac.)/[(In)/(Ft.)] = 3.2(Ac.Ft) Total soil loss = 0.33(In)
Total soil loss = 4.692(Ac.Ft)
Total rainfall = 0.55(In)
Flood volume = 140866.6 Cubic Feet
Total soil loss = 204384.4 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 108.350(CFS)
-------------------------------------------------------------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 - H O U R S T O R M
R u n o f f H y d r o g r a p h
-------------------------------------------------------------------- Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
Hydrograph in 5 Minute intervals ((CFS))
-------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 50.0 100.0 150.0 200.0 ----------------------------------------------------------------------- 0+ 5 0.0018 0.25 Q | | | | 0+10 0.0117 1.44 Q | | | | 0+15 0.0322 2.98 Q | | | | 0+20 0.0591 3.91 Q | | | | 0+25 0.0904 4.54 QV | | | | 0+30 0.1260 5.18 |Q | | | | 0+35 0.1690 6.23 |QV | | | | 0+40 0.2381 10.04 | Q | | | | 0+45 0.3834 21.09 | Q | | | | 0+50 0.7572 54.28 | VQ | | | 0+55 1.5034 108.35 | | V |Q | | 1+ 0 2.1863 99.17 | | Q| V | | 1+ 5 2.5277 49.57 | Q| | |V | 1+10 2.7209 28.05 | Q | | | V | 1+15 2.8515 18.96 | Q | | | V | 1+20 2.9455 13.64 | Q | | | V | 1+25 3.0158 10.21 | Q | | | V | 1+30 3.0687 7.68 |Q | | | V | 1+35 3.1123 6.34 |Q | | | V | 1+40 3.1464 4.94 Q | | | V | 1+45 3.1730 3.87 Q | | | V| 1+50 3.1936 2.99 Q | | | V| 1+55 3.2095 2.31 Q | | | V| 2+ 0 3.2231 1.98 Q | | | V| 2+ 5 3.2328 1.41 Q | | | V| 2+10 3.2337 0.13 Q | | | V| 2+15 3.2339 0.02 Q | | | V ----------------------------------------------------------------------- Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification

Section 3
U n i t H y d r o g r a p h A n a l y s i s
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2014, Version 9.0 Study date 05/18/21 File: EXA00232.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6406
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- TRACT 31194 - GOLDEN MEADOWS HYDROLOGY STUDY – AREA ‘A’ EXISTING CONDITION 'OVERALL' UNIT HYDROGRAPH - 2 YEAR 3 HOUR STORM HUNSAKER & ASSOCIATES, FEBRUARY 2019
BY: BRIAN LOWELL, PE
-------------------------------------------------------------------- Drainage Area = 173.20(Ac.) = 0.271 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 173.20(Ac.) = 0.271 Sq. Mi.

Length along longest watercourse = 4753.00(Ft.)
Length along longest watercourse measured to centroid = 1892.00(Ft.) Length along longest watercourse = 0.900 Mi.

Length along longest watercourse measured to centroid = 0.358 Mi.

Difference in elevation = 254.00(Ft.)
Slope along watercourse = 282.1628 Ft./Mi.

Average Manning's 'N' = 0.030
Lag time = 0.160 Hr.

Lag time = 9.62 Min.
25% of lag time = 2.40 Min.
40% of lag time = 3.85 Min.

Unit time = 5.00 Min.

Duration of storm = 3 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]
173.20 0.85 147.22
100 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]
173.20 2.00 346.40
STORM EVENT (YEAR) = 2.00
Area Averaged 2-Year Rainfall = 0.850(In)
Area Averaged 100-Year Rainfall = 2.000(In)
Point rain (area averaged) = 0.850(In)
Areal adjustment factor = 99.92 %
Adjusted average point rain = 0.849(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %
173.200 83.70 0.000
Total Area Entered = 173.20(Ac.)
Preliminary Hydrology Analysis – Golden Meadows – Tract 31194 – Major Modification