Attachment 5n - PC Report H_HydroReports_Part-6 — Riverside City Council, May 20, 2025 (part 1 of 3)

CR
X
X
X
X
X
X

FIRE PUMP (UTILITY)
1600A
MSB1A (UTILITY)
4000A
MSB1B (UTILITY)
4000A
P-12961

TRANSFORMER PAD AND ENCLOSURE
K810-SB60-21
P-12962

TRANSFORMER PAD AND ENCLOSURE
K810-SB60-21
T
DN
.

EX. MEDICAL

OFFICE BUILDING
4510

BROCKTON
EX. MEDICAL
OFFICE

BUILDING
4500

BROCKTON
EX.

BLDG. G
EX. MEDICAL

OFFICE BUILDING
4510

BROCKTON
EX. MEDICAL

OFFICEBUILDING
4500

BROCKTON
EX. CHURCH
EX. BLDG. C
4445

MAGNOLIA
EX.

PARKING GARAGE4550 BROCKTON

COMMUNITY
PLAYERS BLDG.
4026 14TH
STREET

TEQUESQUITE AVE

BROCKTON AVE

MAGNOLIA AVENUE
14 TH STREET

NEW BROCKTON

PARKING GARAGE

RIVERSIDE COMMUNITY

HOSPITAL NEW BROCKTON

PARKING GARAGE

WQMP EXHIBIT
©
NORTH
LEGEND
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 19 Riverside Community Hospital Phase 1 │ Preliminary Hydrology Report January 2025

Appendix G - Rational Method
Analysis

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices ____________________________________________________________________________ ****************************************************************************

RATIONAL METHOD HYDROLOGY COMPUTER PROGRAM BASED ON

RIVERSIDE COUNTY FLOOD CONTROL & WATER CONSERVATION DISTRICT (RCFC&WCD) 1978 HYDROLOGY MANUAL
(c) Copyright 1982-2016 Advanced Engineering Software (aes) (Rational Tabling Version 23.0)
Release Date: 07/01/2016 License ID 1499
Analysis prepared by:
************************** DESCRIPTION OF STUDY ************************** * Riverside Community Hospital * * 10 yr Existing Condition * * Kimley-Horn * ************************************************************************** FILE NAME: RCHG10E.DAT
TIME/DATE OF STUDY: 22:24 07/17/2024
---------------------------------------------------------------------------- USER SPECIFIED HYDROLOGY AND HYDRAULIC MODEL INFORMATION:
---------------------------------------------------------------------------- USER SPECIFIED STORM EVENT(YEAR) = 10.00
SPECIFIED MINIMUM PIPE SIZE(INCH) = 6.00
SPECIFIED PERCENT OF GRADIENTS(DECIMAL) TO USE FOR FRICTION SLOPE = 0.95 10-YEAR STORM 10-MINUTE INTENSITY(INCH/HOUR) = 1.550
10-YEAR STORM 60-MINUTE INTENSITY(INCH/HOUR) = 0.649
100-YEAR STORM 10-MINUTE INTENSITY(INCH/HOUR) = 2.510
100-YEAR STORM 60-MINUTE INTENSITY(INCH/HOUR) = 1.060
SLOPE OF 10-YEAR INTENSITY-DURATION CURVE = 0.4858784
SLOPE OF 100-YEAR INTENSITY-DURATION CURVE = 0.4810990 COMPUTED RAINFALL INTENSITY DATA:

STORM EVENT = 10.00 1-HOUR INTENSITY(INCH/HOUR) = 0.655 SLOPE OF INTENSITY DURATION CURVE = 0.4859
RCFC&WCD HYDROLOGY MANUAL "C"-VALUES USED FOR RATIONAL METHOD NOTE: COMPUTE CONFLUENCE VALUES ACCORDING TO RCFC&WCD HYDROLOGY MANUAL

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

WIDTH CROSSFALL IN- / OUT-/PARK- HEIGHT WIDTH LIP HIKE FACTOR NO. (FT) (FT) SIDE / SIDE/ WAY (FT) (FT) (FT) (FT) (n) === ===== ========= ================= ====== ===== ====== ===== ======= 1 30.0 20.0 0.018/0.018/0.020 0.67 2.00 0.0313 0.167 0.0150 GLOBAL STREET FLOW-DEPTH CONSTRAINTS:

1. Relative Flow-Depth = 0.00 FEET
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices as (Maximum Allowable Street Flow Depth) - (Top-of-Curb)

2. (Depth)*(Velocity) Constraint = 6.0 (FT*FT/S)
*SIZE PIPE WITH A FLOW CAPACITY GREATER THAN
OR EQUAL TO THE UPSTREAM TRIBUTARY PIPE.*
**************************************************************************** FLOW PROCESS FROM NODE 10.00 TO NODE 11.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS MOBILE HOME PARK
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 581.00
UPSTREAM ELEVATION(FEET) = 809.20
DOWNSTREAM ELEVATION(FEET) = 792.70
ELEVATION DIFFERENCE(FEET) = 16.50
TC = 0.336*[( 581.00**3)/( 16.50)]**.2 = 8.734
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 1.672
MOBILE HOME PARK DEVELOPMENT RUNOFF COEFFICIENT = .8133 SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 3.09
TOTAL AREA(ACRES) = 2.27 TOTAL RUNOFF(CFS) = 3.09 **************************************************************************** FLOW PROCESS FROM NODE 20.00 TO NODE 21.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS MOBILE HOME PARK
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 165.00
UPSTREAM ELEVATION(FEET) = 793.40
DOWNSTREAM ELEVATION(FEET) = 793.00
ELEVATION DIFFERENCE(FEET) = 0.40
TC = 0.336*[( 165.00**3)/( 0.40)]**.2 = 8.635
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 1.681
MOBILE HOME PARK DEVELOPMENT RUNOFF COEFFICIENT = .8136 SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 1.38
TOTAL AREA(ACRES) = 1.01 TOTAL RUNOFF(CFS) = 1.38 ============================================================================ END OF STUDY SUMMARY:

TOTAL AREA(ACRES) = 1.0 TC(MIN.) = 8.64 PEAK FLOW RATE(CFS) = 1.38
============================================================================ ============================================================================

END OF RATIONAL METHOD ANALYSIS

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices ____________________________________________________________________________ ****************************************************************************

RATIONAL METHOD HYDROLOGY COMPUTER PROGRAM BASED ON

RIVERSIDE COUNTY FLOOD CONTROL & WATER CONSERVATION DISTRICT (RCFC&WCD) 1978 HYDROLOGY MANUAL
(c) Copyright 1982-2016 Advanced Engineering Software (aes) (Rational Tabling Version 23.0)
Release Date: 07/01/2016 License ID 1499
Analysis prepared by:
************************** DESCRIPTION OF STUDY ************************** * Riverside Community Hospital * * 100 yr Existing Garage * * Kimley-Horn * ************************************************************************** FILE NAME: RCHG100E.DAT
TIME/DATE OF STUDY: 22:26 07/17/2024
---------------------------------------------------------------------------- USER SPECIFIED HYDROLOGY AND HYDRAULIC MODEL INFORMATION:
---------------------------------------------------------------------------- USER SPECIFIED STORM EVENT(YEAR) = 100.00
SPECIFIED MINIMUM PIPE SIZE(INCH) = 6.00
SPECIFIED PERCENT OF GRADIENTS(DECIMAL) TO USE FOR FRICTION SLOPE = 0.95 10-YEAR STORM 10-MINUTE INTENSITY(INCH/HOUR) = 1.550
10-YEAR STORM 60-MINUTE INTENSITY(INCH/HOUR) = 0.649
100-YEAR STORM 10-MINUTE INTENSITY(INCH/HOUR) = 2.510
100-YEAR STORM 60-MINUTE INTENSITY(INCH/HOUR) = 1.060
SLOPE OF 10-YEAR INTENSITY-DURATION CURVE = 0.4858784
SLOPE OF 100-YEAR INTENSITY-DURATION CURVE = 0.4810990 COMPUTED RAINFALL INTENSITY DATA:

STORM EVENT = 100.00 1-HOUR INTENSITY(INCH/HOUR) = 1.060 SLOPE OF INTENSITY DURATION CURVE = 0.4811
RCFC&WCD HYDROLOGY MANUAL "C"-VALUES USED FOR RATIONAL METHOD NOTE: COMPUTE CONFLUENCE VALUES ACCORDING TO RCFC&WCD HYDROLOGY MANUAL

1. Relative Flow-Depth = 0.00 FEET
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices as (Maximum Allowable Street Flow Depth) - (Top-of-Curb)

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS MOBILE HOME PARK
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 581.00
UPSTREAM ELEVATION(FEET) = 809.20
DOWNSTREAM ELEVATION(FEET) = 792.70
ELEVATION DIFFERENCE(FEET) = 16.50
TC = 0.336*[( 581.00**3)/( 16.50)]**.2 = 8.734
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.679
MOBILE HOME PARK DEVELOPMENT RUNOFF COEFFICIENT = .8367 SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 5.09
TOTAL AREA(ACRES) = 2.27 TOTAL RUNOFF(CFS) = 5.09 **************************************************************************** FLOW PROCESS FROM NODE 20.00 TO NODE 21.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS MOBILE HOME PARK
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 1.01
UPSTREAM ELEVATION(FEET) = 793.40
DOWNSTREAM ELEVATION(FEET) = 793.00
ELEVATION DIFFERENCE(FEET) = 0.40
TC = 0.336*[( 1.01**3)/( 0.40)]**.2 = 0.406
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.503
MOBILE HOME PARK DEVELOPMENT RUNOFF COEFFICIENT = .8482 SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 3.00
TOTAL AREA(ACRES) = 1.01 TOTAL RUNOFF(CFS) = 3.00 ============================================================================ END OF STUDY SUMMARY:

TOTAL AREA(ACRES) = 1.0 TC(MIN.) = 5.00 PEAK FLOW RATE(CFS) = 3.00
============================================================================ ============================================================================

END OF RATIONAL METHOD ANALYSIS
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

RATIONAL METHOD HYDROLOGY COMPUTER PROGRAM BASED ON

RIVERSIDE COUNTY FLOOD CONTROL & WATER CONSERVATION DISTRICT (RCFC&WCD) 1978 HYDROLOGY MANUAL
(c) Copyright 1982-2016 Advanced Engineering Software (aes) (Rational Tabling Version 23.0)
Release Date: 07/01/2016 License ID 1499
Analysis prepared by:
************************** DESCRIPTION OF STUDY ************************** * RCH PHASE 1 * * 10 YR PROPOSED * * KIMLEY-HORN * ************************************************************************** FILE NAME: P1RCH10.DAT
TIME/DATE OF STUDY: 18:28 10/03/2024
---------------------------------------------------------------------------- USER SPECIFIED HYDROLOGY AND HYDRAULIC MODEL INFORMATION:
---------------------------------------------------------------------------- USER SPECIFIED STORM EVENT(YEAR) = 10.00
SPECIFIED MINIMUM PIPE SIZE(INCH) = 6.00
SPECIFIED PERCENT OF GRADIENTS(DECIMAL) TO USE FOR FRICTION SLOPE = 0.95 10-YEAR STORM 10-MINUTE INTENSITY(INCH/HOUR) = 1.550
10-YEAR STORM 60-MINUTE INTENSITY(INCH/HOUR) = 0.649
100-YEAR STORM 10-MINUTE INTENSITY(INCH/HOUR) = 2.510
100-YEAR STORM 60-MINUTE INTENSITY(INCH/HOUR) = 1.060
SLOPE OF 10-YEAR INTENSITY-DURATION CURVE = 0.4858784
SLOPE OF 100-YEAR INTENSITY-DURATION CURVE = 0.4810990 COMPUTED RAINFALL INTENSITY DATA:

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

ASSUMED INITIAL SUBAREA UNIFORM
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

DEVELOPMENT IS COMMERCIAL
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 95.00
UPSTREAM ELEVATION(FEET) = 804.00
DOWNSTREAM ELEVATION(FEET) = 797.90
ELEVATION DIFFERENCE(FEET) = 6.10
TC = 0.303*[( 95.00**3)/( 6.10)]**.2 = 3.245
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.192
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8709
SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 0.15
TOTAL AREA(ACRES) = 0.08 TOTAL RUNOFF(CFS) = 0.15 **************************************************************************** FLOW PROCESS FROM NODE 20.00 TO NODE 21.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS COMMERCIAL
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 400.00
UPSTREAM ELEVATION(FEET) = 803.10
DOWNSTREAM ELEVATION(FEET) = 794.30
ELEVATION DIFFERENCE(FEET) = 8.80
TC = 0.303*[( 400.00**3)/( 8.80)]**.2 = 7.144
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 1.843
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8674
SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 0.34
TOTAL AREA(ACRES) = 0.21 TOTAL RUNOFF(CFS) = 0.34 **************************************************************************** FLOW PROCESS FROM NODE 30.00 TO NODE 31.00 IS CODE = 22 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS COMMERCIAL
USER SPECIFIED Tc(MIN.) = 5.000
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.192
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8709
SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 1.89
TOTAL AREA(ACRES) = 0.99 TOTAL RUNOFF(CFS) = 1.89 **************************************************************************** FLOW PROCESS FROM NODE 40.00 TO NODE 41.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS COMMERCIAL
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 17.00
UPSTREAM ELEVATION(FEET) = 795.00
DOWNSTREAM ELEVATION(FEET) = 794.70
ELEVATION DIFFERENCE(FEET) = 0.30
TC = 0.303*[( 17.00**3)/( 0.30)]**.2 = 2.111
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.192
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8709
SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 0.02
TOTAL AREA(ACRES) = 0.01 TOTAL RUNOFF(CFS) = 0.02 **************************************************************************** FLOW PROCESS FROM NODE 60.00 TO NODE 61.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS COMMERCIAL
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 109.00
UPSTREAM ELEVATION(FEET) = 796.70
DOWNSTREAM ELEVATION(FEET) = 795.10
ELEVATION DIFFERENCE(FEET) = 1.60
TC = 0.303*[( 109.00**3)/( 1.60)]**.2 = 4.605
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.192
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8709
SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 0.10
TOTAL AREA(ACRES) = 0.05 TOTAL RUNOFF(CFS) = 0.10 **************************************************************************** FLOW PROCESS FROM NODE 70.00 TO NODE 71.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS COMMERCIAL
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 49.00
UPSTREAM ELEVATION(FEET) = 797.90
DOWNSTREAM ELEVATION(FEET) = 797.20
ELEVATION DIFFERENCE(FEET) = 0.70
TC = 0.303*[( 49.00**3)/( 0.70)]**.2 = 3.363
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.192
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8709
SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 0.08
TOTAL AREA(ACRES) = 0.04 TOTAL RUNOFF(CFS) = 0.08 **************************************************************************** FLOW PROCESS FROM NODE 80.00 TO NODE 81.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS COMMERCIAL
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 109.00
UPSTREAM ELEVATION(FEET) = 795.00
DOWNSTREAM ELEVATION(FEET) = 793.60
ELEVATION DIFFERENCE(FEET) = 1.40
TC = 0.303*[( 109.00**3)/( 1.40)]**.2 = 4.729
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.192
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8709
SOIL CLASSIFICATION IS "B"
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices SUBAREA RUNOFF(CFS) = 1.11
TOTAL AREA(ACRES) = 0.58 TOTAL RUNOFF(CFS) = 1.11 **************************************************************************** FLOW PROCESS FROM NODE 90.00 TO NODE 91.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS COMMERCIAL
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 574.00
UPSTREAM ELEVATION(FEET) = 809.00
DOWNSTREAM ELEVATION(FEET) = 792.50
ELEVATION DIFFERENCE(FEET) = 16.50
TC = 0.303*[( 574.00**3)/( 16.50)]**.2 = 7.824
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 1.764
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8665
SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 1.99
TOTAL AREA(ACRES) = 1.30 TOTAL RUNOFF(CFS) = 1.99 **************************************************************************** FLOW PROCESS FROM NODE 100.00 TO NODE 101.00 IS CODE = 22 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS COMMERCIAL
USER SPECIFIED Tc(MIN.) = 5.000
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.192
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8709
SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 0.04
TOTAL AREA(ACRES) = 0.02 TOTAL RUNOFF(CFS) = 0.04 ============================================================================ END OF STUDY SUMMARY:

TOTAL AREA(ACRES) = 0.0 TC(MIN.) = 5.00 PEAK FLOW RATE(CFS) = 0.04
============================================================================ ============================================================================

END OF RATIONAL METHOD ANALYSIS

RATIONAL METHOD HYDROLOGY COMPUTER PROGRAM BASED ON

RIVERSIDE COUNTY FLOOD CONTROL & WATER CONSERVATION DISTRICT (RCFC&WCD) 1978 HYDROLOGY MANUAL
(c) Copyright 1982-2016 Advanced Engineering Software (aes) (Rational Tabling Version 23.0)
Release Date: 07/01/2016 License ID 1499
Analysis prepared by:
************************** DESCRIPTION OF STUDY ************************** * RCH PHASE 1 * * 100 YR PROPOSED * * KIMLEY-HORN * ************************************************************************** FILE NAME: P1RCH10.DAT
TIME/DATE OF STUDY: 18:29 10/03/2024
---------------------------------------------------------------------------- USER SPECIFIED HYDROLOGY AND HYDRAULIC MODEL INFORMATION:
---------------------------------------------------------------------------- USER SPECIFIED STORM EVENT(YEAR) = 100.00
SPECIFIED MINIMUM PIPE SIZE(INCH) = 6.00
SPECIFIED PERCENT OF GRADIENTS(DECIMAL) TO USE FOR FRICTION SLOPE = 0.95 10-YEAR STORM 10-MINUTE INTENSITY(INCH/HOUR) = 1.550
10-YEAR STORM 60-MINUTE INTENSITY(INCH/HOUR) = 0.649
100-YEAR STORM 10-MINUTE INTENSITY(INCH/HOUR) = 2.510
100-YEAR STORM 60-MINUTE INTENSITY(INCH/HOUR) = 1.060
SLOPE OF 10-YEAR INTENSITY-DURATION CURVE = 0.4858784
SLOPE OF 100-YEAR INTENSITY-DURATION CURVE = 0.4810990 COMPUTED RAINFALL INTENSITY DATA:

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

ASSUMED INITIAL SUBAREA UNIFORM
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

DEVELOPMENT IS COMMERCIAL
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 95.00
UPSTREAM ELEVATION(FEET) = 804.00
DOWNSTREAM ELEVATION(FEET) = 797.90
ELEVATION DIFFERENCE(FEET) = 6.10
TC = 0.303*[( 95.00**3)/( 6.10)]**.2 = 3.245
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.503
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8793
SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 0.25
TOTAL AREA(ACRES) = 0.08 TOTAL RUNOFF(CFS) = 0.25 **************************************************************************** FLOW PROCESS FROM NODE 20.00 TO NODE 21.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS COMMERCIAL
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 400.00
UPSTREAM ELEVATION(FEET) = 803.10
DOWNSTREAM ELEVATION(FEET) = 794.30
ELEVATION DIFFERENCE(FEET) = 8.80
TC = 0.303*[( 400.00**3)/( 8.80)]**.2 = 7.144
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.951
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8764
SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 0.54
TOTAL AREA(ACRES) = 0.21 TOTAL RUNOFF(CFS) = 0.54 **************************************************************************** FLOW PROCESS FROM NODE 30.00 TO NODE 31.00 IS CODE = 22 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS COMMERCIAL
USER SPECIFIED Tc(MIN.) = 5.000
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.503
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8793
SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 3.05
TOTAL AREA(ACRES) = 0.99 TOTAL RUNOFF(CFS) = 3.05 **************************************************************************** FLOW PROCESS FROM NODE 40.00 TO NODE 41.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS COMMERCIAL
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 17.00
UPSTREAM ELEVATION(FEET) = 795.00
DOWNSTREAM ELEVATION(FEET) = 794.70
ELEVATION DIFFERENCE(FEET) = 0.30
TC = 0.303*[( 17.00**3)/( 0.30)]**.2 = 2.111
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.503
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8793
SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 0.03
TOTAL AREA(ACRES) = 0.01 TOTAL RUNOFF(CFS) = 0.03 **************************************************************************** FLOW PROCESS FROM NODE 60.00 TO NODE 61.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS COMMERCIAL
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 109.00
UPSTREAM ELEVATION(FEET) = 796.70
DOWNSTREAM ELEVATION(FEET) = 795.10
ELEVATION DIFFERENCE(FEET) = 1.60
TC = 0.303*[( 109.00**3)/( 1.60)]**.2 = 4.605
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.503
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8793
SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 0.15
TOTAL AREA(ACRES) = 0.05 TOTAL RUNOFF(CFS) = 0.15 **************************************************************************** FLOW PROCESS FROM NODE 70.00 TO NODE 71.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS COMMERCIAL
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 49.00
UPSTREAM ELEVATION(FEET) = 797.90
DOWNSTREAM ELEVATION(FEET) = 797.20
ELEVATION DIFFERENCE(FEET) = 0.70
TC = 0.303*[( 49.00**3)/( 0.70)]**.2 = 3.363
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.503
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8793
SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 0.12
TOTAL AREA(ACRES) = 0.04 TOTAL RUNOFF(CFS) = 0.12 **************************************************************************** FLOW PROCESS FROM NODE 80.00 TO NODE 81.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS COMMERCIAL
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 109.00
UPSTREAM ELEVATION(FEET) = 795.00
DOWNSTREAM ELEVATION(FEET) = 793.60
ELEVATION DIFFERENCE(FEET) = 1.40
TC = 0.303*[( 109.00**3)/( 1.40)]**.2 = 4.729
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.503
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8793
SOIL CLASSIFICATION IS "B"
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices SUBAREA RUNOFF(CFS) = 1.79
TOTAL AREA(ACRES) = 0.58 TOTAL RUNOFF(CFS) = 1.79 **************************************************************************** FLOW PROCESS FROM NODE 90.00 TO NODE 91.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS COMMERCIAL
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 574.00
UPSTREAM ELEVATION(FEET) = 809.00
DOWNSTREAM ELEVATION(FEET) = 792.50
ELEVATION DIFFERENCE(FEET) = 16.50
TC = 0.303*[( 574.00**3)/( 16.50)]**.2 = 7.824
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.824
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8757
SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 3.22
TOTAL AREA(ACRES) = 1.30 TOTAL RUNOFF(CFS) = 3.22 **************************************************************************** FLOW PROCESS FROM NODE 100.00 TO NODE 101.00 IS CODE = 22 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS COMMERCIAL
USER SPECIFIED Tc(MIN.) = 5.000
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.503
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8793
SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 0.06
TOTAL AREA(ACRES) = 0.02 TOTAL RUNOFF(CFS) = 0.06 ============================================================================ END OF STUDY SUMMARY:

TOTAL AREA(ACRES) = 0.0 TC(MIN.) = 5.00 PEAK FLOW RATE(CFS) = 0.06
============================================================================ ============================================================================

END OF RATIONAL METHOD ANALYSIS

RATIONAL METHOD HYDROLOGY COMPUTER PROGRAM BASED ON

RIVERSIDE COUNTY FLOOD CONTROL & WATER CONSERVATION DISTRICT (RCFC&WCD) 1978 HYDROLOGY MANUAL
(c) Copyright 1982-2016 Advanced Engineering Software (aes) (Rational Tabling Version 23.0)
Release Date: 07/01/2016 License ID 1499
Analysis prepared by:
************************** DESCRIPTION OF STUDY ************************** * RCH Phase 2 * * 10 yr Proposed * * Kimley-Horn * ************************************************************************** FILE NAME: P2RCH10.DAT
TIME/DATE OF STUDY: 18:39 10/03/2024
---------------------------------------------------------------------------- USER SPECIFIED HYDROLOGY AND HYDRAULIC MODEL INFORMATION:
---------------------------------------------------------------------------- USER SPECIFIED STORM EVENT(YEAR) = 10.00
SPECIFIED MINIMUM PIPE SIZE(INCH) = 6.00
SPECIFIED PERCENT OF GRADIENTS(DECIMAL) TO USE FOR FRICTION SLOPE = 0.95 10-YEAR STORM 10-MINUTE INTENSITY(INCH/HOUR) = 1.550
10-YEAR STORM 60-MINUTE INTENSITY(INCH/HOUR) = 0.649
100-YEAR STORM 10-MINUTE INTENSITY(INCH/HOUR) = 2.510
100-YEAR STORM 60-MINUTE INTENSITY(INCH/HOUR) = 1.060
SLOPE OF 10-YEAR INTENSITY-DURATION CURVE = 0.4858784
SLOPE OF 100-YEAR INTENSITY-DURATION CURVE = 0.4810990 COMPUTED RAINFALL INTENSITY DATA:

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

ASSUMED INITIAL SUBAREA UNIFORM
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS COMMERCIAL
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 109.00
UPSTREAM ELEVATION(FEET) = 796.60
DOWNSTREAM ELEVATION(FEET) = 795.00
ELEVATION DIFFERENCE(FEET) = 1.60
TC = 0.303*[( 109.00**3)/( 1.60)]**.2 = 4.605
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.192
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8709
SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 0.10
TOTAL AREA(ACRES) = 0.05 TOTAL RUNOFF(CFS) = 0.10 **************************************************************************** FLOW PROCESS FROM NODE 70.00 TO NODE 71.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS COMMERCIAL
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 49.00
UPSTREAM ELEVATION(FEET) = 797.90
DOWNSTREAM ELEVATION(FEET) = 796.40
ELEVATION DIFFERENCE(FEET) = 1.50
TC = 0.303*[( 49.00**3)/( 1.50)]**.2 = 2.887
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.192
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8709
SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 0.08
TOTAL AREA(ACRES) = 0.04 TOTAL RUNOFF(CFS) = 0.08 **************************************************************************** FLOW PROCESS FROM NODE 80.00 TO NODE 81.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS COMMERCIAL
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 230.00
UPSTREAM ELEVATION(FEET) = 794.70
DOWNSTREAM ELEVATION(FEET) = 791.00
ELEVATION DIFFERENCE(FEET) = 3.70
TC = 0.303*[( 230.00**3)/( 3.70)]**.2 = 6.095
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 1.991
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8690
SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 0.93
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices TOTAL AREA(ACRES) = 0.54 TOTAL RUNOFF(CFS) = 0.93 **************************************************************************** FLOW PROCESS FROM NODE 90.00 TO NODE 91.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS COMMERCIAL
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 574.00
UPSTREAM ELEVATION(FEET) = 809.00
DOWNSTREAM ELEVATION(FEET) = 792.50
ELEVATION DIFFERENCE(FEET) = 16.50
TC = 0.303*[( 574.00**3)/( 16.50)]**.2 = 7.824
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 1.764
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8665
SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 2.05
TOTAL AREA(ACRES) = 1.34 TOTAL RUNOFF(CFS) = 2.05 **************************************************************************** FLOW PROCESS FROM NODE 100.00 TO NODE 101.00 IS CODE = 22 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS COMMERCIAL
USER SPECIFIED Tc(MIN.) = 5.000
10 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.192
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8709
SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 0.04
TOTAL AREA(ACRES) = 0.02 TOTAL RUNOFF(CFS) = 0.04 ============================================================================ END OF STUDY SUMMARY:

END OF RATIONAL METHOD ANALYSIS

RATIONAL METHOD HYDROLOGY COMPUTER PROGRAM BASED ON

RIVERSIDE COUNTY FLOOD CONTROL & WATER CONSERVATION DISTRICT (RCFC&WCD) 1978 HYDROLOGY MANUAL
(c) Copyright 1982-2016 Advanced Engineering Software (aes) (Rational Tabling Version 23.0)
Release Date: 07/01/2016 License ID 1499
Analysis prepared by:
************************** DESCRIPTION OF STUDY ************************** * RCH Phase 2 * * 100 YR PROPOSED * * Kimley-Horn * ************************************************************************** FILE NAME: P2RCH10.DAT
TIME/DATE OF STUDY: 18:40 10/03/2024
---------------------------------------------------------------------------- USER SPECIFIED HYDROLOGY AND HYDRAULIC MODEL INFORMATION:
---------------------------------------------------------------------------- USER SPECIFIED STORM EVENT(YEAR) = 100.00
SPECIFIED MINIMUM PIPE SIZE(INCH) = 6.00
SPECIFIED PERCENT OF GRADIENTS(DECIMAL) TO USE FOR FRICTION SLOPE = 0.95 10-YEAR STORM 10-MINUTE INTENSITY(INCH/HOUR) = 1.550
10-YEAR STORM 60-MINUTE INTENSITY(INCH/HOUR) = 0.649
100-YEAR STORM 10-MINUTE INTENSITY(INCH/HOUR) = 2.510
100-YEAR STORM 60-MINUTE INTENSITY(INCH/HOUR) = 1.060
SLOPE OF 10-YEAR INTENSITY-DURATION CURVE = 0.4858784
SLOPE OF 100-YEAR INTENSITY-DURATION CURVE = 0.4810990 COMPUTED RAINFALL INTENSITY DATA:

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

ASSUMED INITIAL SUBAREA UNIFORM
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices

DEVELOPMENT IS COMMERCIAL
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 95.00
UPSTREAM ELEVATION(FEET) = 804.00
DOWNSTREAM ELEVATION(FEET) = 797.90
ELEVATION DIFFERENCE(FEET) = 6.10
TC = 0.303*[( 95.00**3)/( 6.10)]**.2 = 3.245
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.503
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8793
SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 0.25
TOTAL AREA(ACRES) = 0.08 TOTAL RUNOFF(CFS) = 0.25 **************************************************************************** FLOW PROCESS FROM NODE 20.00 TO NODE 21.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS COMMERCIAL
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 400.00
UPSTREAM ELEVATION(FEET) = 803.10
DOWNSTREAM ELEVATION(FEET) = 794.30
ELEVATION DIFFERENCE(FEET) = 8.80
TC = 0.303*[( 400.00**3)/( 8.80)]**.2 = 7.144
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.951
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8764
SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 0.54
TOTAL AREA(ACRES) = 0.21 TOTAL RUNOFF(CFS) = 0.54 **************************************************************************** FLOW PROCESS FROM NODE 30.00 TO NODE 31.00 IS CODE = 22 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS COMMERCIAL
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 17.00
UPSTREAM ELEVATION(FEET) = 795.00
DOWNSTREAM ELEVATION(FEET) = 794.70
ELEVATION DIFFERENCE(FEET) = 0.30
TC = 0.303*[( 17.00**3)/( 0.30)]**.2 = 2.111
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.503
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8793
SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 0.03
TOTAL AREA(ACRES) = 0.01 TOTAL RUNOFF(CFS) = 0.03 **************************************************************************** FLOW PROCESS FROM NODE 60.00 TO NODE 61.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS COMMERCIAL
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 109.00
UPSTREAM ELEVATION(FEET) = 796.60
DOWNSTREAM ELEVATION(FEET) = 795.00
ELEVATION DIFFERENCE(FEET) = 1.60
TC = 0.303*[( 109.00**3)/( 1.60)]**.2 = 4.605
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.503
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8793
SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 0.15
TOTAL AREA(ACRES) = 0.05 TOTAL RUNOFF(CFS) = 0.15 **************************************************************************** FLOW PROCESS FROM NODE 70.00 TO NODE 71.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS COMMERCIAL
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 49.00
UPSTREAM ELEVATION(FEET) = 797.90
DOWNSTREAM ELEVATION(FEET) = 796.40
ELEVATION DIFFERENCE(FEET) = 1.50
TC = 0.303*[( 49.00**3)/( 1.50)]**.2 = 2.887
COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN.
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.503
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8793
SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 0.12
TOTAL AREA(ACRES) = 0.04 TOTAL RUNOFF(CFS) = 0.12 **************************************************************************** FLOW PROCESS FROM NODE 80.00 TO NODE 81.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS COMMERCIAL
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 230.00
UPSTREAM ELEVATION(FEET) = 794.70
DOWNSTREAM ELEVATION(FEET) = 791.00
ELEVATION DIFFERENCE(FEET) = 3.70
TC = 0.303*[( 230.00**3)/( 3.70)]**.2 = 6.095
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.185
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8777
SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 1.51
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices TOTAL AREA(ACRES) = 0.54 TOTAL RUNOFF(CFS) = 1.51 **************************************************************************** FLOW PROCESS FROM NODE 90.00 TO NODE 91.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS COMMERCIAL
TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2
INITIAL SUBAREA FLOW-LENGTH(FEET) = 574.00
UPSTREAM ELEVATION(FEET) = 809.00
DOWNSTREAM ELEVATION(FEET) = 792.50
ELEVATION DIFFERENCE(FEET) = 16.50
TC = 0.303*[( 574.00**3)/( 16.50)]**.2 = 7.824
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.824
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8757
SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 3.31
TOTAL AREA(ACRES) = 1.34 TOTAL RUNOFF(CFS) = 3.31 **************************************************************************** FLOW PROCESS FROM NODE 100.00 TO NODE 101.00 IS CODE = 22 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<<
============================================================================

ASSUMED INITIAL SUBAREA UNIFORM

DEVELOPMENT IS COMMERCIAL
USER SPECIFIED Tc(MIN.) = 5.000
100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.503
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8793
SOIL CLASSIFICATION IS "B"
SUBAREA RUNOFF(CFS) = 0.06
TOTAL AREA(ACRES) = 0.02 TOTAL RUNOFF(CFS) = 0.06 ============================================================================ END OF STUDY SUMMARY:

END OF RATIONAL METHOD ANALYSIS

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 20 Riverside Community Hospital Phase 1 │ Preliminary Hydrology Report January 2025

Appendix H - Unit Hydrograph Analysis

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 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 - 2018, Version 9.0 Study date 10/07/24 File: rchexa12.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6443
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- RCH Garage
EX-A
2 yr existing
Kimley-Horn
-------------------------------------------------------------------- Drainage Area = 2.27(Ac.) = 0.004 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 2.27(Ac.) =

0.004 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.116 Hr.

Lag time = 6.96 Min.
25% of lag time = 1.74 Min.
40% of lag time = 2.78 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]

2.27 0.50 1.14
100 YEAR Area rainfall data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

2.27 1.10 2.50
STORM EVENT (YEAR) = 2.00
Area Averaged 2-Year Rainfall = 0.500(In)
Area Averaged 100-Year Rainfall = 1.100(In)
Point rain (area averaged) = 0.500(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 0.500(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

2.270 56.00 0.820
Total Area Entered = 2.27(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

Drainage Area for Depth-Area Areal Adjustment = 2.27(Ac.) =

0.004 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.116 Hr.

Lag time = 6.96 Min.
25% of lag time = 1.74 Min.
40% of lag time = 2.78 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]

2.27 0.80 1.82
100 YEAR Area rainfall data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

2.27 1.80 4.09
STORM EVENT (YEAR) = 2.00
Area Averaged 2-Year Rainfall = 0.800(In)
Area Averaged 100-Year Rainfall = 1.800(In)
Point rain (area averaged) = 0.800(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 0.800(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

2.270 56.00 0.820
Total Area Entered = 2.27(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

Drainage Area for Depth-Area Areal Adjustment = 2.27(Ac.) =

0.004 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.116 Hr.

Lag time = 6.96 Min.
25% of lag time = 1.74 Min.
40% of lag time = 2.78 Min.

Unit time = 5.00 Min.

Duration of storm = 6 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

2.27 1.00 2.27
100 YEAR Area rainfall data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

2.27 2.50 5.67
STORM EVENT (YEAR) = 2.00
Area Averaged 2-Year Rainfall = 1.000(In)
Area Averaged 100-Year Rainfall = 2.500(In)
Point rain (area averaged) = 1.000(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 1.000(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

2.270 56.00 0.820
Total Area Entered = 2.27(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

Drainage Area for Depth-Area Areal Adjustment = 2.27(Ac.) =

0.004 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.116 Hr.

Lag time = 6.96 Min.
25% of lag time = 1.74 Min.
40% of lag time = 2.78 Min.

Unit time = 5.00 Min.

Duration of storm = 24 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

2.27 1.60 3.63
100 YEAR Area rainfall data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

2.27 4.00 9.08
STORM EVENT (YEAR) = 2.00
Area Averaged 2-Year Rainfall = 1.600(In)
Area Averaged 100-Year Rainfall = 4.000(In)
Point rain (area averaged) = 1.600(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 1.600(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

2.270 56.00 0.820
Total Area Entered = 2.27(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

56.0 36.0 0.706 0.820 0.185 1.000 0.185 Sum (F) = 0.185
Area averaged mean soil loss (F) (In/Hr) = 0.185
Minimum soil loss rate ((In/Hr)) = 0.092
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.250
--------------------------------------------------------------------- U n i t H y d r o g r a p h
FOOTHILL S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 71.839 7.478 0.171 2 0.167 143.678 42.579 0.974 3 0.250 215.517 28.152 0.644 4 0.333 287.356 10.698 0.245 5 0.417 359.195 5.830 0.133 6 0.500 431.034 2.898 0.066 7 0.583 502.874 1.029 0.024 8 0.667 574.713 0.577 0.013 9 0.750 646.552 0.483 0.011 10 0.833 718.391 0.275 0.006 Sum = 100.000 Sum= 2.288
----------------------------------------------------------------------- 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 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Unit Time Pattern Storm Rain Loss rate(In./Hr) Effective (Hr.) Percent (In/Hr) Max | Low (In/Hr) 1 0.08 0.07 0.013 ( 0.328) 0.003 0.010 2 0.17 0.07 0.013 ( 0.327) 0.003 0.010 3 0.25 0.07 0.013 ( 0.325) 0.003 0.010 4 0.33 0.10 0.019 ( 0.324) 0.005 0.014 5 0.42 0.10 0.019 ( 0.323) 0.005 0.014 6 0.50 0.10 0.019 ( 0.322) 0.005 0.014 7 0.58 0.10 0.019 ( 0.320) 0.005 0.014 8 0.67 0.10 0.019 ( 0.319) 0.005 0.014 9 0.75 0.10 0.019 ( 0.318) 0.005 0.014 10 0.83 0.13 0.026 ( 0.317) 0.006 0.019 11 0.92 0.13 0.026 ( 0.315) 0.006 0.019 12 1.00 0.13 0.026 ( 0.314) 0.006 0.019 13 1.08 0.10 0.019 ( 0.313) 0.005 0.014 14 1.17 0.10 0.019 ( 0.312) 0.005 0.014 15 1.25 0.10 0.019 ( 0.310) 0.005 0.014 16 1.33 0.10 0.019 ( 0.309) 0.005 0.014 17 1.42 0.10 0.019 ( 0.308) 0.005 0.014 18 1.50 0.10 0.019 ( 0.307) 0.005 0.014 19 1.58 0.10 0.019 ( 0.305) 0.005 0.014 20 1.67 0.10 0.019 ( 0.304) 0.005 0.014 21 1.75 0.10 0.019 ( 0.303) 0.005 0.014 22 1.83 0.13 0.026 ( 0.302) 0.006 0.019 23 1.92 0.13 0.026 ( 0.301) 0.006 0.019 24 2.00 0.13 0.026 ( 0.299) 0.006 0.019 25 2.08 0.13 0.026 ( 0.298) 0.006 0.019 26 2.17 0.13 0.026 ( 0.297) 0.006 0.019 27 2.25 0.13 0.026 ( 0.296) 0.006 0.019 28 2.33 0.13 0.026 ( 0.295) 0.006 0.019 29 2.42 0.13 0.026 ( 0.293) 0.006 0.019 30 2.50 0.13 0.026 ( 0.292) 0.006 0.019 31 2.58 0.17 0.032 ( 0.291) 0.008 0.024 32 2.67 0.17 0.032 ( 0.290) 0.008 0.024 33 2.75 0.17 0.032 ( 0.289) 0.008 0.024 34 2.83 0.17 0.032 ( 0.287) 0.008 0.024 35 2.92 0.17 0.032 ( 0.286) 0.008 0.024 36 3.00 0.17 0.032 ( 0.285) 0.008 0.024 37 3.08 0.17 0.032 ( 0.284) 0.008 0.024 38 3.17 0.17 0.032 ( 0.283) 0.008 0.024 39 3.25 0.17 0.032 ( 0.281) 0.008 0.024 40 3.33 0.17 0.032 ( 0.280) 0.008 0.024 41 3.42 0.17 0.032 ( 0.279) 0.008 0.024 42 3.50 0.17 0.032 ( 0.278) 0.008 0.024 43 3.58 0.17 0.032 ( 0.277) 0.008 0.024 44 3.67 0.17 0.032 ( 0.276) 0.008 0.024 45 3.75 0.17 0.032 ( 0.274) 0.008 0.024 46 3.83 0.20 0.038 ( 0.273) 0.010 0.029 47 3.92 0.20 0.038 ( 0.272) 0.010 0.029 48 4.00 0.20 0.038 ( 0.271) 0.010 0.029 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 49 4.08 0.20 0.038 ( 0.270) 0.010 0.029 50 4.17 0.20 0.038 ( 0.269) 0.010 0.029 51 4.25 0.20 0.038 ( 0.268) 0.010 0.029 52 4.33 0.23 0.045 ( 0.266) 0.011 0.034 53 4.42 0.23 0.045 ( 0.265) 0.011 0.034 54 4.50 0.23 0.045 ( 0.264) 0.011 0.034 55 4.58 0.23 0.045 ( 0.263) 0.011 0.034 56 4.67 0.23 0.045 ( 0.262) 0.011 0.034 57 4.75 0.23 0.045 ( 0.261) 0.011 0.034 58 4.83 0.27 0.051 ( 0.260) 0.013 0.038 59 4.92 0.27 0.051 ( 0.259) 0.013 0.038 60 5.00 0.27 0.051 ( 0.257) 0.013 0.038 61 5.08 0.20 0.038 ( 0.256) 0.010 0.029 62 5.17 0.20 0.038 ( 0.255) 0.010 0.029 63 5.25 0.20 0.038 ( 0.254) 0.010 0.029 64 5.33 0.23 0.045 ( 0.253) 0.011 0.034 65 5.42 0.23 0.045 ( 0.252) 0.011 0.034 66 5.50 0.23 0.045 ( 0.251) 0.011 0.034 67 5.58 0.27 0.051 ( 0.250) 0.013 0.038 68 5.67 0.27 0.051 ( 0.249) 0.013 0.038 69 5.75 0.27 0.051 ( 0.247) 0.013 0.038 70 5.83 0.27 0.051 ( 0.246) 0.013 0.038 71 5.92 0.27 0.051 ( 0.245) 0.013 0.038 72 6.00 0.27 0.051 ( 0.244) 0.013 0.038 73 6.08 0.30 0.058 ( 0.243) 0.014 0.043 74 6.17 0.30 0.058 ( 0.242) 0.014 0.043 75 6.25 0.30 0.058 ( 0.241) 0.014 0.043 76 6.33 0.30 0.058 ( 0.240) 0.014 0.043 77 6.42 0.30 0.058 ( 0.239) 0.014 0.043 78 6.50 0.30 0.058 ( 0.238) 0.014 0.043 79 6.58 0.33 0.064 ( 0.237) 0.016 0.048 80 6.67 0.33 0.064 ( 0.236) 0.016 0.048 81 6.75 0.33 0.064 ( 0.234) 0.016 0.048 82 6.83 0.33 0.064 ( 0.233) 0.016 0.048 83 6.92 0.33 0.064 ( 0.232) 0.016 0.048 84 7.00 0.33 0.064 ( 0.231) 0.016 0.048 85 7.08 0.33 0.064 ( 0.230) 0.016 0.048 86 7.17 0.33 0.064 ( 0.229) 0.016 0.048 87 7.25 0.33 0.064 ( 0.228) 0.016 0.048 88 7.33 0.37 0.070 ( 0.227) 0.018 0.053 89 7.42 0.37 0.070 ( 0.226) 0.018 0.053 90 7.50 0.37 0.070 ( 0.225) 0.018 0.053 91 7.58 0.40 0.077 ( 0.224) 0.019 0.058 92 7.67 0.40 0.077 ( 0.223) 0.019 0.058 93 7.75 0.40 0.077 ( 0.222) 0.019 0.058 94 7.83 0.43 0.083 ( 0.221) 0.021 0.062 95 7.92 0.43 0.083 ( 0.220) 0.021 0.062 96 8.00 0.43 0.083 ( 0.219) 0.021 0.062 97 8.08 0.50 0.096 ( 0.218) 0.024 0.072 98 8.17 0.50 0.096 ( 0.217) 0.024 0.072 99 8.25 0.50 0.096 ( 0.216) 0.024 0.072 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 100 8.33 0.50 0.096 ( 0.215) 0.024 0.072 101 8.42 0.50 0.096 ( 0.214) 0.024 0.072 102 8.50 0.50 0.096 ( 0.213) 0.024 0.072 103 8.58 0.53 0.102 ( 0.212) 0.026 0.077 104 8.67 0.53 0.102 ( 0.211) 0.026 0.077 105 8.75 0.53 0.102 ( 0.210) 0.026 0.077 106 8.83 0.57 0.109 ( 0.209) 0.027 0.082 107 8.92 0.57 0.109 ( 0.208) 0.027 0.082 108 9.00 0.57 0.109 ( 0.207) 0.027 0.082 109 9.08 0.63 0.122 ( 0.206) 0.030 0.091 110 9.17 0.63 0.122 ( 0.205) 0.030 0.091 111 9.25 0.63 0.122 ( 0.204) 0.030 0.091 112 9.33 0.67 0.128 ( 0.203) 0.032 0.096 113 9.42 0.67 0.128 ( 0.202) 0.032 0.096 114 9.50 0.67 0.128 ( 0.201) 0.032 0.096 115 9.58 0.70 0.134 ( 0.200) 0.034 0.101 116 9.67 0.70 0.134 ( 0.199) 0.034 0.101 117 9.75 0.70 0.134 ( 0.198) 0.034 0.101 118 9.83 0.73 0.141 ( 0.197) 0.035 0.106 119 9.92 0.73 0.141 ( 0.196) 0.035 0.106 120 10.00 0.73 0.141 ( 0.195) 0.035 0.106 121 10.08 0.50 0.096 ( 0.194) 0.024 0.072 122 10.17 0.50 0.096 ( 0.193) 0.024 0.072 123 10.25 0.50 0.096 ( 0.193) 0.024 0.072 124 10.33 0.50 0.096 ( 0.192) 0.024 0.072 125 10.42 0.50 0.096 ( 0.191) 0.024 0.072 126 10.50 0.50 0.096 ( 0.190) 0.024 0.072 127 10.58 0.67 0.128 ( 0.189) 0.032 0.096 128 10.67 0.67 0.128 ( 0.188) 0.032 0.096 129 10.75 0.67 0.128 ( 0.187) 0.032 0.096 130 10.83 0.67 0.128 ( 0.186) 0.032 0.096 131 10.92 0.67 0.128 ( 0.185) 0.032 0.096 132 11.00 0.67 0.128 ( 0.184) 0.032 0.096 133 11.08 0.63 0.122 ( 0.183) 0.030 0.091 134 11.17 0.63 0.122 ( 0.182) 0.030 0.091 135 11.25 0.63 0.122 ( 0.181) 0.030 0.091 136 11.33 0.63 0.122 ( 0.181) 0.030 0.091 137 11.42 0.63 0.122 ( 0.180) 0.030 0.091 138 11.50 0.63 0.122 ( 0.179) 0.030 0.091 139 11.58 0.57 0.109 ( 0.178) 0.027 0.082 140 11.67 0.57 0.109 ( 0.177) 0.027 0.082 141 11.75 0.57 0.109 ( 0.176) 0.027 0.082 142 11.83 0.60 0.115 ( 0.175) 0.029 0.086 143 11.92 0.60 0.115 ( 0.174) 0.029 0.086 144 12.00 0.60 0.115 ( 0.174) 0.029 0.086 145 12.08 0.83 0.160 ( 0.173) 0.040 0.120 146 12.17 0.83 0.160 ( 0.172) 0.040 0.120 147 12.25 0.83 0.160 ( 0.171) 0.040 0.120 148 12.33 0.87 0.166 ( 0.170) 0.042 0.125 149 12.42 0.87 0.166 ( 0.169) 0.042 0.125 150 12.50 0.87 0.166 ( 0.168) 0.042 0.125 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 151 12.58 0.93 0.179 ( 0.168) 0.045 0.134 152 12.67 0.93 0.179 ( 0.167) 0.045 0.134 153 12.75 0.93 0.179 ( 0.166) 0.045 0.134 154 12.83 0.97 0.186 ( 0.165) 0.046 0.139 155 12.92 0.97 0.186 ( 0.164) 0.046 0.139 156 13.00 0.97 0.186 ( 0.163) 0.046 0.139 157 13.08 1.13 0.218 ( 0.163) 0.054 0.163 158 13.17 1.13 0.218 ( 0.162) 0.054 0.163 159 13.25 1.13 0.218 ( 0.161) 0.054 0.163 160 13.33 1.13 0.218 ( 0.160) 0.054 0.163 161 13.42 1.13 0.218 ( 0.159) 0.054 0.163 162 13.50 1.13 0.218 ( 0.158) 0.054 0.163 163 13.58 0.77 0.147 ( 0.158) 0.037 0.110 164 13.67 0.77 0.147 ( 0.157) 0.037 0.110 165 13.75 0.77 0.147 ( 0.156) 0.037 0.110 166 13.83 0.77 0.147 ( 0.155) 0.037 0.110 167 13.92 0.77 0.147 ( 0.154) 0.037 0.110 168 14.00 0.77 0.147 ( 0.154) 0.037 0.110 169 14.08 0.90 0.173 ( 0.153) 0.043 0.130 170 14.17 0.90 0.173 ( 0.152) 0.043 0.130 171 14.25 0.90 0.173 ( 0.151) 0.043 0.130 172 14.33 0.87 0.166 ( 0.151) 0.042 0.125 173 14.42 0.87 0.166 ( 0.150) 0.042 0.125 174 14.50 0.87 0.166 ( 0.149) 0.042 0.125 175 14.58 0.87 0.166 ( 0.148) 0.042 0.125 176 14.67 0.87 0.166 ( 0.147) 0.042 0.125 177 14.75 0.87 0.166 ( 0.147) 0.042 0.125 178 14.83 0.83 0.160 ( 0.146) 0.040 0.120 179 14.92 0.83 0.160 ( 0.145) 0.040 0.120 180 15.00 0.83 0.160 ( 0.144) 0.040 0.120 181 15.08 0.80 0.154 ( 0.144) 0.038 0.115 182 15.17 0.80 0.154 ( 0.143) 0.038 0.115 183 15.25 0.80 0.154 ( 0.142) 0.038 0.115 184 15.33 0.77 0.147 ( 0.142) 0.037 0.110 185 15.42 0.77 0.147 ( 0.141) 0.037 0.110 186 15.50 0.77 0.147 ( 0.140) 0.037 0.110 187 15.58 0.63 0.122 ( 0.139) 0.030 0.091 188 15.67 0.63 0.122 ( 0.139) 0.030 0.091 189 15.75 0.63 0.122 ( 0.138) 0.030 0.091 190 15.83 0.63 0.122 ( 0.137) 0.030 0.091 191 15.92 0.63 0.122 ( 0.137) 0.030 0.091 192 16.00 0.63 0.122 ( 0.136) 0.030 0.091 193 16.08 0.13 0.026 ( 0.135) 0.006 0.019 194 16.17 0.13 0.026 ( 0.134) 0.006 0.019 195 16.25 0.13 0.026 ( 0.134) 0.006 0.019 196 16.33 0.13 0.026 ( 0.133) 0.006 0.019 197 16.42 0.13 0.026 ( 0.132) 0.006 0.019 198 16.50 0.13 0.026 ( 0.132) 0.006 0.019 199 16.58 0.10 0.019 ( 0.131) 0.005 0.014 200 16.67 0.10 0.019 ( 0.130) 0.005 0.014 201 16.75 0.10 0.019 ( 0.130) 0.005 0.014 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 202 16.83 0.10 0.019 ( 0.129) 0.005 0.014 203 16.92 0.10 0.019 ( 0.128) 0.005 0.014 204 17.00 0.10 0.019 ( 0.128) 0.005 0.014 205 17.08 0.17 0.032 ( 0.127) 0.008 0.024 206 17.17 0.17 0.032 ( 0.126) 0.008 0.024 207 17.25 0.17 0.032 ( 0.126) 0.008 0.024 208 17.33 0.17 0.032 ( 0.125) 0.008 0.024 209 17.42 0.17 0.032 ( 0.125) 0.008 0.024 210 17.50 0.17 0.032 ( 0.124) 0.008 0.024 211 17.58 0.17 0.032 ( 0.123) 0.008 0.024 212 17.67 0.17 0.032 ( 0.123) 0.008 0.024 213 17.75 0.17 0.032 ( 0.122) 0.008 0.024 214 17.83 0.13 0.026 ( 0.122) 0.006 0.019 215 17.92 0.13 0.026 ( 0.121) 0.006 0.019 216 18.00 0.13 0.026 ( 0.120) 0.006 0.019 217 18.08 0.13 0.026 ( 0.120) 0.006 0.019 218 18.17 0.13 0.026 ( 0.119) 0.006 0.019 219 18.25 0.13 0.026 ( 0.119) 0.006 0.019 220 18.33 0.13 0.026 ( 0.118) 0.006 0.019 221 18.42 0.13 0.026 ( 0.117) 0.006 0.019 222 18.50 0.13 0.026 ( 0.117) 0.006 0.019 223 18.58 0.10 0.019 ( 0.116) 0.005 0.014 224 18.67 0.10 0.019 ( 0.116) 0.005 0.014 225 18.75 0.10 0.019 ( 0.115) 0.005 0.014 226 18.83 0.07 0.013 ( 0.115) 0.003 0.010 227 18.92 0.07 0.013 ( 0.114) 0.003 0.010 228 19.00 0.07 0.013 ( 0.114) 0.003 0.010 229 19.08 0.10 0.019 ( 0.113) 0.005 0.014 230 19.17 0.10 0.019 ( 0.112) 0.005 0.014 231 19.25 0.10 0.019 ( 0.112) 0.005 0.014 232 19.33 0.13 0.026 ( 0.111) 0.006 0.019 233 19.42 0.13 0.026 ( 0.111) 0.006 0.019 234 19.50 0.13 0.026 ( 0.110) 0.006 0.019 235 19.58 0.10 0.019 ( 0.110) 0.005 0.014 236 19.67 0.10 0.019 ( 0.109) 0.005 0.014 237 19.75 0.10 0.019 ( 0.109) 0.005 0.014 238 19.83 0.07 0.013 ( 0.108) 0.003 0.010 239 19.92 0.07 0.013 ( 0.108) 0.003 0.010 240 20.00 0.07 0.013 ( 0.107) 0.003 0.010 241 20.08 0.10 0.019 ( 0.107) 0.005 0.014 242 20.17 0.10 0.019 ( 0.106) 0.005 0.014 243 20.25 0.10 0.019 ( 0.106) 0.005 0.014 244 20.33 0.10 0.019 ( 0.106) 0.005 0.014 245 20.42 0.10 0.019 ( 0.105) 0.005 0.014 246 20.50 0.10 0.019 ( 0.105) 0.005 0.014 247 20.58 0.10 0.019 ( 0.104) 0.005 0.014 248 20.67 0.10 0.019 ( 0.104) 0.005 0.014 249 20.75 0.10 0.019 ( 0.103) 0.005 0.014 250 20.83 0.07 0.013 ( 0.103) 0.003 0.010 251 20.92 0.07 0.013 ( 0.103) 0.003 0.010 252 21.00 0.07 0.013 ( 0.102) 0.003 0.010 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 253 21.08 0.10 0.019 ( 0.102) 0.005 0.014 254 21.17 0.10 0.019 ( 0.101) 0.005 0.014 255 21.25 0.10 0.019 ( 0.101) 0.005 0.014 256 21.33 0.07 0.013 ( 0.101) 0.003 0.010 257 21.42 0.07 0.013 ( 0.100) 0.003 0.010 258 21.50 0.07 0.013 ( 0.100) 0.003 0.010 259 21.58 0.10 0.019 ( 0.099) 0.005 0.014 260 21.67 0.10 0.019 ( 0.099) 0.005 0.014 261 21.75 0.10 0.019 ( 0.099) 0.005 0.014 262 21.83 0.07 0.013 ( 0.098) 0.003 0.010 263 21.92 0.07 0.013 ( 0.098) 0.003 0.010 264 22.00 0.07 0.013 ( 0.098) 0.003 0.010 265 22.08 0.10 0.019 ( 0.097) 0.005 0.014 266 22.17 0.10 0.019 ( 0.097) 0.005 0.014 267 22.25 0.10 0.019 ( 0.097) 0.005 0.014 268 22.33 0.07 0.013 ( 0.096) 0.003 0.010 269 22.42 0.07 0.013 ( 0.096) 0.003 0.010 270 22.50 0.07 0.013 ( 0.096) 0.003 0.010 271 22.58 0.07 0.013 ( 0.096) 0.003 0.010 272 22.67 0.07 0.013 ( 0.095) 0.003 0.010 273 22.75 0.07 0.013 ( 0.095) 0.003 0.010 274 22.83 0.07 0.013 ( 0.095) 0.003 0.010 275 22.92 0.07 0.013 ( 0.095) 0.003 0.010 276 23.00 0.07 0.013 ( 0.094) 0.003 0.010 277 23.08 0.07 0.013 ( 0.094) 0.003 0.010 278 23.17 0.07 0.013 ( 0.094) 0.003 0.010 279 23.25 0.07 0.013 ( 0.094) 0.003 0.010 280 23.33 0.07 0.013 ( 0.093) 0.003 0.010 281 23.42 0.07 0.013 ( 0.093) 0.003 0.010 282 23.50 0.07 0.013 ( 0.093) 0.003 0.010 283 23.58 0.07 0.013 ( 0.093) 0.003 0.010 284 23.67 0.07 0.013 ( 0.093) 0.003 0.010 285 23.75 0.07 0.013 ( 0.093) 0.003 0.010 286 23.83 0.07 0.013 ( 0.093) 0.003 0.010 287 23.92 0.07 0.013 ( 0.093) 0.003 0.010 288 24.00 0.07 0.013 ( 0.092) 0.003 0.010 (Loss Rate Not Used)
Sum = 100.0 Sum = 14.4 Flood volume = Effective rainfall 1.20(In)
times area 2.3(Ac.)/[(In)/(Ft.)] = 0.2(Ac.Ft) Total soil loss = 0.40(In)
Total soil loss = 0.076(Ac.Ft)
Total rainfall = 1.60(In)
Flood volume = 9888.1 Cubic Feet
Total soil loss = 3296.0 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 0.372(CFS)
-------------------------------------------------------------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 24 - 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
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices -------------------------------------------------------------------- Hydrograph in 5 Minute intervals ((CFS))
-------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 2.5 5.0 7.5 10.0 ----------------------------------------------------------------------- 0+ 5 0.0000 0.00 Q | | | | 0+10 0.0001 0.01 Q | | | | 0+15 0.0002 0.02 Q | | | | 0+20 0.0003 0.02 Q | | | | 0+25 0.0005 0.03 Q | | | | 0+30 0.0007 0.03 Q | | | | 0+35 0.0010 0.03 Q | | | | 0+40 0.0012 0.03 Q | | | | 0+45 0.0014 0.03 Q | | | | 0+50 0.0016 0.03 Q | | | | 0+55 0.0019 0.04 Q | | | | 1+ 0 0.0022 0.04 Q | | | | 1+ 5 0.0025 0.04 Q | | | | 1+10 0.0027 0.04 Q | | | | 1+15 0.0030 0.04 Q | | | | 1+20 0.0032 0.03 Q | | | | 1+25 0.0034 0.03 Q | | | | 1+30 0.0037 0.03 Q | | | | 1+35 0.0039 0.03 Q | | | | 1+40 0.0041 0.03 Q | | | | 1+45 0.0043 0.03 Q | | | | 1+50 0.0046 0.03 Q | | | | 1+55 0.0048 0.04 Q | | | | 2+ 0 0.0051 0.04 Q | | | | 2+ 5 0.0054 0.04 Q | | | | 2+10 0.0057 0.04 QV | | | | 2+15 0.0060 0.04 QV | | | | 2+20 0.0063 0.04 QV | | | | 2+25 0.0066 0.04 QV | | | | 2+30 0.0069 0.04 QV | | | | 2+35 0.0072 0.04 QV | | | | 2+40 0.0076 0.05 QV | | | | 2+45 0.0079 0.05 QV | | | | 2+50 0.0083 0.05 QV | | | | 2+55 0.0087 0.05 QV | | | | 3+ 0 0.0091 0.05 QV | | | | 3+ 5 0.0094 0.05 QV | | | | 3+10 0.0098 0.05 QV | | | | 3+15 0.0102 0.05 QV | | | | 3+20 0.0106 0.05 QV | | | | 3+25 0.0110 0.05 QV | | | | 3+30 0.0113 0.05 QV | | | | 3+35 0.0117 0.05 Q V | | | | 3+40 0.0121 0.05 Q V | | | | 3+45 0.0125 0.05 Q V | | | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 3+50 0.0128 0.06 Q V | | | | 3+55 0.0133 0.06 Q V | | | | 4+ 0 0.0137 0.06 Q V | | | | 4+ 5 0.0141 0.06 Q V | | | | 4+10 0.0146 0.07 Q V | | | | 4+15 0.0151 0.07 Q V | | | | 4+20 0.0155 0.07 Q V | | | | 4+25 0.0160 0.07 Q V | | | | 4+30 0.0165 0.07 Q V | | | | 4+35 0.0170 0.08 Q V | | | | 4+40 0.0176 0.08 Q V | | | | 4+45 0.0181 0.08 Q V | | | | 4+50 0.0186 0.08 Q V | | | | 4+55 0.0192 0.08 Q V | | | | 5+ 0 0.0198 0.09 Q V | | | | 5+ 5 0.0204 0.09 Q V | | | | 5+10 0.0209 0.08 Q V | | | | 5+15 0.0214 0.07 Q V | | | | 5+20 0.0218 0.07 Q V | | | | 5+25 0.0223 0.07 Q V | | | | 5+30 0.0229 0.08 Q V | | | | 5+35 0.0234 0.08 Q V | | | | 5+40 0.0240 0.08 Q V | | | | 5+45 0.0245 0.09 Q V | | | | 5+50 0.0251 0.09 Q V | | | | 5+55 0.0257 0.09 Q V | | | | 6+ 0 0.0263 0.09 Q V | | | | 6+ 5 0.0270 0.09 Q V | | | | 6+10 0.0276 0.09 Q V | | | | 6+15 0.0283 0.10 Q V | | | | 6+20 0.0289 0.10 Q V | | | | 6+25 0.0296 0.10 Q V | | | | 6+30 0.0303 0.10 Q V | | | | 6+35 0.0310 0.10 Q V | | | | 6+40 0.0317 0.10 Q V | | | | 6+45 0.0324 0.11 Q V | | | | 6+50 0.0332 0.11 Q V | | | | 6+55 0.0339 0.11 Q V | | | | 7+ 0 0.0347 0.11 Q V | | | | 7+ 5 0.0354 0.11 Q V | | | | 7+10 0.0362 0.11 Q V | | | | 7+15 0.0370 0.11 Q V | | | | 7+20 0.0377 0.11 Q V | | | | 7+25 0.0385 0.12 Q V | | | | 7+30 0.0393 0.12 Q V | | | | 7+35 0.0402 0.12 Q V | | | | 7+40 0.0410 0.13 Q V | | | | 7+45 0.0419 0.13 Q V | | | | 7+50 0.0428 0.13 Q V | | | | 7+55 0.0438 0.14 Q V | | | | 8+ 0 0.0447 0.14 Q V | | | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 8+ 5 0.0457 0.14 Q V | | | | 8+10 0.0468 0.15 Q V | | | | 8+15 0.0479 0.16 Q V | | | | 8+20 0.0490 0.16 Q V | | | | 8+25 0.0501 0.16 Q V | | | | 8+30 0.0512 0.16 Q V| | | | 8+35 0.0524 0.17 Q V| | | | 8+40 0.0536 0.17 Q V| | | | 8+45 0.0547 0.17 Q V| | | | 8+50 0.0560 0.18 Q V| | | | 8+55 0.0572 0.18 Q V | | | 9+ 0 0.0585 0.18 Q V | | | 9+ 5 0.0598 0.19 Q V | | | 9+10 0.0611 0.20 Q V | | | 9+15 0.0625 0.20 Q |V | | | 9+20 0.0639 0.21 Q |V | | | 9+25 0.0654 0.21 Q |V | | | 9+30 0.0669 0.22 Q |V | | | 9+35 0.0684 0.22 Q | V | | | 9+40 0.0700 0.22 Q | V | | | 9+45 0.0715 0.23 Q | V | | | 9+50 0.0731 0.23 Q | V | | | 9+55 0.0747 0.24 Q | V | | | 10+ 0 0.0764 0.24 Q | V | | | 10+ 5 0.0780 0.23 Q | V | | | 10+10 0.0794 0.20 Q | V | | | 10+15 0.0806 0.18 Q | V | | | 10+20 0.0818 0.17 Q | V | | | 10+25 0.0830 0.17 Q | V | | | 10+30 0.0841 0.17 Q | V | | | 10+35 0.0853 0.17 Q | V | | | 10+40 0.0866 0.19 Q | V | | | 10+45 0.0881 0.21 Q | V | | | 10+50 0.0895 0.21 Q | V | | | 10+55 0.0910 0.22 Q | V | | | 11+ 0 0.0925 0.22 Q | V | | | 11+ 5 0.0940 0.22 Q | V | | | 11+10 0.0955 0.21 Q | V | | | 11+15 0.0970 0.21 Q | V | | | 11+20 0.0984 0.21 Q | V | | | 11+25 0.0999 0.21 Q | V | | | 11+30 0.1013 0.21 Q | V | | | 11+35 0.1027 0.21 Q | V | | | 11+40 0.1041 0.20 Q | V | | | 11+45 0.1054 0.19 Q | V | | | 11+50 0.1067 0.19 Q | V | | | 11+55 0.1080 0.19 Q | V| | | 12+ 0 0.1094 0.20 Q | V| | | 12+ 5 0.1108 0.20 Q | V| | | 12+10 0.1124 0.24 Q | V| | | 12+15 0.1142 0.26 |Q | V | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 12+20 0.1160 0.27 |Q | V | | 12+25 0.1179 0.28 |Q | V | | 12+30 0.1199 0.28 |Q | |V | | 12+35 0.1218 0.29 |Q | |V | | 12+40 0.1239 0.30 |Q | |V | | 12+45 0.1260 0.30 |Q | | V | | 12+50 0.1281 0.31 |Q | | V | | 12+55 0.1302 0.31 |Q | | V | | 13+ 0 0.1324 0.32 |Q | | V | | 13+ 5 0.1346 0.32 |Q | | V | | 13+10 0.1370 0.35 |Q | | V | | 13+15 0.1395 0.36 |Q | | V | | 13+20 0.1420 0.37 |Q | | V | | 13+25 0.1445 0.37 |Q | | V | | 13+30 0.1471 0.37 |Q | | V | | 13+35 0.1496 0.36 |Q | | V | | 13+40 0.1518 0.31 |Q | | V | | 13+45 0.1537 0.28 |Q | | V | | 13+50 0.1555 0.27 |Q | | V | | 13+55 0.1573 0.26 |Q | | V | | 14+ 0 0.1591 0.26 |Q | | V | | 14+ 5 0.1608 0.26 |Q | | V | | 14+10 0.1627 0.28 |Q | | V | | 14+15 0.1647 0.29 |Q | | V| | 14+20 0.1667 0.29 |Q | | V| | 14+25 0.1687 0.29 |Q | | V| | 14+30 0.1707 0.29 |Q | | V | 14+35 0.1727 0.29 |Q | | V | 14+40 0.1746 0.29 |Q | | V | 14+45 0.1766 0.29 |Q | | |V | 14+50 0.1786 0.28 |Q | | |V | 14+55 0.1805 0.28 |Q | | |V | 15+ 0 0.1824 0.28 |Q | | | V | 15+ 5 0.1843 0.28 |Q | | | V | 15+10 0.1861 0.27 |Q | | | V | 15+15 0.1880 0.27 |Q | | | V | 15+20 0.1898 0.26 |Q | | | V | 15+25 0.1916 0.26 |Q | | | V | 15+30 0.1933 0.26 |Q | | | V | 15+35 0.1951 0.25 |Q | | | V | 15+40 0.1967 0.23 Q | | | V | 15+45 0.1982 0.22 Q | | | V | 15+50 0.1996 0.21 Q | | | V | 15+55 0.2011 0.21 Q | | | V | 16+ 0 0.2025 0.21 Q | | | V | 16+ 5 0.2039 0.20 Q | | | V | 16+10 0.2048 0.13 Q | | | V | 16+15 0.2053 0.08 Q | | | V | 16+20 0.2057 0.06 Q | | | V | 16+25 0.2061 0.05 Q | | | V | 16+30 0.2064 0.05 Q | | | V | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 16+35 0.2067 0.05 Q | | | V | 16+40 0.2070 0.04 Q | | | V | 16+45 0.2073 0.04 Q | | | V | 16+50 0.2075 0.03 Q | | | V | 16+55 0.2077 0.03 Q | | | V | 17+ 0 0.2080 0.03 Q | | | V | 17+ 5 0.2082 0.03 Q | | | V | 17+10 0.2085 0.04 Q | | | V | 17+15 0.2089 0.05 Q | | | V | 17+20 0.2092 0.05 Q | | | V | 17+25 0.2096 0.05 Q | | | V | 17+30 0.2100 0.05 Q | | | V | 17+35 0.2103 0.05 Q | | | V | 17+40 0.2107 0.05 Q | | | V | 17+45 0.2111 0.05 Q | | | V | 17+50 0.2115 0.05 Q | | | V | 17+55 0.2118 0.05 Q | | | V | 18+ 0 0.2121 0.05 Q | | | V | 18+ 5 0.2124 0.05 Q | | | V | 18+10 0.2127 0.04 Q | | | V | 18+15 0.2130 0.04 Q | | | V | 18+20 0.2133 0.04 Q | | | V | 18+25 0.2137 0.04 Q | | | V | 18+30 0.2140 0.04 Q | | | V | 18+35 0.2143 0.04 Q | | | V | 18+40 0.2145 0.04 Q | | | V | 18+45 0.2148 0.04 Q | | | V | 18+50 0.2150 0.03 Q | | | V | 18+55 0.2152 0.03 Q | | | V | 19+ 0 0.2154 0.02 Q | | | V | 19+ 5 0.2155 0.02 Q | | | V | 19+10 0.2157 0.03 Q | | | V | 19+15 0.2159 0.03 Q | | | V | 19+20 0.2161 0.03 Q | | | V | 19+25 0.2164 0.04 Q | | | V | 19+30 0.2167 0.04 Q | | | V | 19+35 0.2170 0.04 Q | | | V | 19+40 0.2172 0.04 Q | | | V | 19+45 0.2175 0.04 Q | | | V | 19+50 0.2177 0.03 Q | | | V | 19+55 0.2179 0.03 Q | | | V | 20+ 0 0.2181 0.02 Q | | | V | 20+ 5 0.2182 0.02 Q | | | V | 20+10 0.2184 0.03 Q | | | V | 20+15 0.2186 0.03 Q | | | V | 20+20 0.2189 0.03 Q | | | V | 20+25 0.2191 0.03 Q | | | V | 20+30 0.2193 0.03 Q | | | V | 20+35 0.2195 0.03 Q | | | V | 20+40 0.2198 0.03 Q | | | V | 20+45 0.2200 0.03 Q | | | V | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 20+50 0.2202 0.03 Q | | | V | 20+55 0.2204 0.03 Q | | | V | 21+ 0 0.2206 0.02 Q | | | V | 21+ 5 0.2207 0.02 Q | | | V | 21+10 0.2209 0.03 Q | | | V | 21+15 0.2211 0.03 Q | | | V | 21+20 0.2214 0.03 Q | | | V| 21+25 0.2215 0.03 Q | | | V| 21+30 0.2217 0.02 Q | | | V| 21+35 0.2219 0.02 Q | | | V| 21+40 0.2221 0.03 Q | | | V| 21+45 0.2223 0.03 Q | | | V| 21+50 0.2225 0.03 Q | | | V| 21+55 0.2227 0.03 Q | | | V| 22+ 0 0.2228 0.02 Q | | | V| 22+ 5 0.2230 0.02 Q | | | V| 22+10 0.2232 0.03 Q | | | V| 22+15 0.2234 0.03 Q | | | V| 22+20 0.2236 0.03 Q | | | V| 22+25 0.2238 0.03 Q | | | V| 22+30 0.2240 0.02 Q | | | V| 22+35 0.2241 0.02 Q | | | V| 22+40 0.2243 0.02 Q | | | V| 22+45 0.2244 0.02 Q | | | V| 22+50 0.2246 0.02 Q | | | V| 22+55 0.2248 0.02 Q | | | V| 23+ 0 0.2249 0.02 Q | | | V| 23+ 5 0.2251 0.02 Q | | | V| 23+10 0.2252 0.02 Q | | | V| 23+15 0.2254 0.02 Q | | | V| 23+20 0.2255 0.02 Q | | | V| 23+25 0.2257 0.02 Q | | | V| 23+30 0.2258 0.02 Q | | | V| 23+35 0.2260 0.02 Q | | | V| 23+40 0.2261 0.02 Q | | | V| 23+45 0.2263 0.02 Q | | | V| 23+50 0.2264 0.02 Q | | | V| 23+55 0.2266 0.02 Q | | | V| 24+ 0 0.2267 0.02 Q | | | V| 24+ 5 0.2269 0.02 Q | | | V| 24+10 0.2269 0.01 Q | | | V| 24+15 0.2270 0.00 Q | | | V| 24+20 0.2270 0.00 Q | | | V| 24+25 0.2270 0.00 Q | | | V| 24+30 0.2270 0.00 Q | | | V| 24+35 0.2270 0.00 Q | | | V| 24+40 0.2270 0.00 Q | | | V| 24+45 0.2270 0.00 Q | | | V ----------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 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 - 2018, Version 9.0 Study date 10/07/24 File: rchexa15.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6443
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- RCH Garage
EX-A
5 yr existing
Kimley-Horn
-------------------------------------------------------------------- Drainage Area = 2.27(Ac.) = 0.004 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 2.27(Ac.) =

0.004 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.116 Hr.

Lag time = 6.96 Min.
25% of lag time = 1.74 Min.
40% of lag time = 2.78 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]

2.27 0.50 1.14
100 YEAR Area rainfall data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

2.27 1.10 2.50
STORM EVENT (YEAR) = 5.00
Area Averaged 2-Year Rainfall = 0.500(In)
Area Averaged 100-Year Rainfall = 1.100(In)
Point rain (area averaged) = 0.641(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 0.641(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

2.270 56.00 0.820
Total Area Entered = 2.27(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

Drainage Area for Depth-Area Areal Adjustment = 2.27(Ac.) =

0.004 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.116 Hr.

Lag time = 6.96 Min.
25% of lag time = 1.74 Min.
40% of lag time = 2.78 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]

2.27 0.80 1.82
100 YEAR Area rainfall data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

2.27 1.80 4.09
STORM EVENT (YEAR) = 5.00
Area Averaged 2-Year Rainfall = 0.800(In)
Area Averaged 100-Year Rainfall = 1.800(In)
Point rain (area averaged) = 1.034(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 1.034(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

2.270 56.00 0.820
Total Area Entered = 2.27(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

Drainage Area for Depth-Area Areal Adjustment = 2.27(Ac.) =

0.004 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.116 Hr.

Lag time = 6.96 Min.
25% of lag time = 1.74 Min.
40% of lag time = 2.78 Min.

Unit time = 5.00 Min.

Duration of storm = 6 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

2.27 1.00 2.27
100 YEAR Area rainfall data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

2.27 2.50 5.67
STORM EVENT (YEAR) = 5.00
Area Averaged 2-Year Rainfall = 1.000(In)
Area Averaged 100-Year Rainfall = 2.500(In)
Point rain (area averaged) = 1.351(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 1.351(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

2.270 56.00 0.820
Total Area Entered = 2.27(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

Drainage Area for Depth-Area Areal Adjustment = 2.27(Ac.) =

0.004 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.116 Hr.

Lag time = 6.96 Min.
25% of lag time = 1.74 Min.
40% of lag time = 2.78 Min.

Unit time = 5.00 Min.

Duration of storm = 24 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

2.27 1.60 3.63
100 YEAR Area rainfall data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

2.27 4.00 9.08
STORM EVENT (YEAR) = 5.00
Area Averaged 2-Year Rainfall = 1.600(In)
Area Averaged 100-Year Rainfall = 4.000(In)
Point rain (area averaged) = 2.162(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 2.162(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

2.270 56.00 0.820
Total Area Entered = 2.27(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

56.0 36.0 0.706 0.820 0.185 1.000 0.185 Sum (F) = 0.185
Area averaged mean soil loss (F) (In/Hr) = 0.185
Minimum soil loss rate ((In/Hr)) = 0.092
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.250
--------------------------------------------------------------------- U n i t H y d r o g r a p h
FOOTHILL S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 71.839 7.478 0.171 2 0.167 143.678 42.579 0.974 3 0.250 215.517 28.152 0.644 4 0.333 287.356 10.698 0.245 5 0.417 359.195 5.830 0.133 6 0.500 431.034 2.898 0.066 7 0.583 502.874 1.029 0.024 8 0.667 574.713 0.577 0.013 9 0.750 646.552 0.483 0.011 10 0.833 718.391 0.275 0.006 Sum = 100.000 Sum= 2.288
----------------------------------------------------------------------- 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 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Unit Time Pattern Storm Rain Loss rate(In./Hr) Effective (Hr.) Percent (In/Hr) Max | Low (In/Hr) 1 0.08 0.07 0.017 ( 0.328) 0.004 0.013 2 0.17 0.07 0.017 ( 0.327) 0.004 0.013 3 0.25 0.07 0.017 ( 0.325) 0.004 0.013 4 0.33 0.10 0.026 ( 0.324) 0.006 0.019 5 0.42 0.10 0.026 ( 0.323) 0.006 0.019 6 0.50 0.10 0.026 ( 0.322) 0.006 0.019 7 0.58 0.10 0.026 ( 0.320) 0.006 0.019 8 0.67 0.10 0.026 ( 0.319) 0.006 0.019 9 0.75 0.10 0.026 ( 0.318) 0.006 0.019 10 0.83 0.13 0.035 ( 0.317) 0.009 0.026 11 0.92 0.13 0.035 ( 0.315) 0.009 0.026 12 1.00 0.13 0.035 ( 0.314) 0.009 0.026 13 1.08 0.10 0.026 ( 0.313) 0.006 0.019 14 1.17 0.10 0.026 ( 0.312) 0.006 0.019 15 1.25 0.10 0.026 ( 0.310) 0.006 0.019 16 1.33 0.10 0.026 ( 0.309) 0.006 0.019 17 1.42 0.10 0.026 ( 0.308) 0.006 0.019 18 1.50 0.10 0.026 ( 0.307) 0.006 0.019 19 1.58 0.10 0.026 ( 0.305) 0.006 0.019 20 1.67 0.10 0.026 ( 0.304) 0.006 0.019 21 1.75 0.10 0.026 ( 0.303) 0.006 0.019 22 1.83 0.13 0.035 ( 0.302) 0.009 0.026 23 1.92 0.13 0.035 ( 0.301) 0.009 0.026 24 2.00 0.13 0.035 ( 0.299) 0.009 0.026 25 2.08 0.13 0.035 ( 0.298) 0.009 0.026 26 2.17 0.13 0.035 ( 0.297) 0.009 0.026 27 2.25 0.13 0.035 ( 0.296) 0.009 0.026 28 2.33 0.13 0.035 ( 0.295) 0.009 0.026 29 2.42 0.13 0.035 ( 0.293) 0.009 0.026 30 2.50 0.13 0.035 ( 0.292) 0.009 0.026 31 2.58 0.17 0.043 ( 0.291) 0.011 0.032 32 2.67 0.17 0.043 ( 0.290) 0.011 0.032 33 2.75 0.17 0.043 ( 0.289) 0.011 0.032 34 2.83 0.17 0.043 ( 0.287) 0.011 0.032 35 2.92 0.17 0.043 ( 0.286) 0.011 0.032 36 3.00 0.17 0.043 ( 0.285) 0.011 0.032 37 3.08 0.17 0.043 ( 0.284) 0.011 0.032 38 3.17 0.17 0.043 ( 0.283) 0.011 0.032 39 3.25 0.17 0.043 ( 0.281) 0.011 0.032 40 3.33 0.17 0.043 ( 0.280) 0.011 0.032 41 3.42 0.17 0.043 ( 0.279) 0.011 0.032 42 3.50 0.17 0.043 ( 0.278) 0.011 0.032 43 3.58 0.17 0.043 ( 0.277) 0.011 0.032 44 3.67 0.17 0.043 ( 0.276) 0.011 0.032 45 3.75 0.17 0.043 ( 0.274) 0.011 0.032 46 3.83 0.20 0.052 ( 0.273) 0.013 0.039 47 3.92 0.20 0.052 ( 0.272) 0.013 0.039 48 4.00 0.20 0.052 ( 0.271) 0.013 0.039 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 49 4.08 0.20 0.052 ( 0.270) 0.013 0.039 50 4.17 0.20 0.052 ( 0.269) 0.013 0.039 51 4.25 0.20 0.052 ( 0.268) 0.013 0.039 52 4.33 0.23 0.061 ( 0.266) 0.015 0.045 53 4.42 0.23 0.061 ( 0.265) 0.015 0.045 54 4.50 0.23 0.061 ( 0.264) 0.015 0.045 55 4.58 0.23 0.061 ( 0.263) 0.015 0.045 56 4.67 0.23 0.061 ( 0.262) 0.015 0.045 57 4.75 0.23 0.061 ( 0.261) 0.015 0.045 58 4.83 0.27 0.069 ( 0.260) 0.017 0.052 59 4.92 0.27 0.069 ( 0.259) 0.017 0.052 60 5.00 0.27 0.069 ( 0.257) 0.017 0.052 61 5.08 0.20 0.052 ( 0.256) 0.013 0.039 62 5.17 0.20 0.052 ( 0.255) 0.013 0.039 63 5.25 0.20 0.052 ( 0.254) 0.013 0.039 64 5.33 0.23 0.061 ( 0.253) 0.015 0.045 65 5.42 0.23 0.061 ( 0.252) 0.015 0.045 66 5.50 0.23 0.061 ( 0.251) 0.015 0.045 67 5.58 0.27 0.069 ( 0.250) 0.017 0.052 68 5.67 0.27 0.069 ( 0.249) 0.017 0.052 69 5.75 0.27 0.069 ( 0.247) 0.017 0.052 70 5.83 0.27 0.069 ( 0.246) 0.017 0.052 71 5.92 0.27 0.069 ( 0.245) 0.017 0.052 72 6.00 0.27 0.069 ( 0.244) 0.017 0.052 73 6.08 0.30 0.078 ( 0.243) 0.019 0.058 74 6.17 0.30 0.078 ( 0.242) 0.019 0.058 75 6.25 0.30 0.078 ( 0.241) 0.019 0.058 76 6.33 0.30 0.078 ( 0.240) 0.019 0.058 77 6.42 0.30 0.078 ( 0.239) 0.019 0.058 78 6.50 0.30 0.078 ( 0.238) 0.019 0.058 79 6.58 0.33 0.086 ( 0.237) 0.022 0.065 80 6.67 0.33 0.086 ( 0.236) 0.022 0.065 81 6.75 0.33 0.086 ( 0.234) 0.022 0.065 82 6.83 0.33 0.086 ( 0.233) 0.022 0.065 83 6.92 0.33 0.086 ( 0.232) 0.022 0.065 84 7.00 0.33 0.086 ( 0.231) 0.022 0.065 85 7.08 0.33 0.086 ( 0.230) 0.022 0.065 86 7.17 0.33 0.086 ( 0.229) 0.022 0.065 87 7.25 0.33 0.086 ( 0.228) 0.022 0.065 88 7.33 0.37 0.095 ( 0.227) 0.024 0.071 89 7.42 0.37 0.095 ( 0.226) 0.024 0.071 90 7.50 0.37 0.095 ( 0.225) 0.024 0.071 91 7.58 0.40 0.104 ( 0.224) 0.026 0.078 92 7.67 0.40 0.104 ( 0.223) 0.026 0.078 93 7.75 0.40 0.104 ( 0.222) 0.026 0.078 94 7.83 0.43 0.112 ( 0.221) 0.028 0.084 95 7.92 0.43 0.112 ( 0.220) 0.028 0.084 96 8.00 0.43 0.112 ( 0.219) 0.028 0.084 97 8.08 0.50 0.130 ( 0.218) 0.032 0.097 98 8.17 0.50 0.130 ( 0.217) 0.032 0.097 99 8.25 0.50 0.130 ( 0.216) 0.032 0.097 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 100 8.33 0.50 0.130 ( 0.215) 0.032 0.097 101 8.42 0.50 0.130 ( 0.214) 0.032 0.097 102 8.50 0.50 0.130 ( 0.213) 0.032 0.097 103 8.58 0.53 0.138 ( 0.212) 0.035 0.104 104 8.67 0.53 0.138 ( 0.211) 0.035 0.104 105 8.75 0.53 0.138 ( 0.210) 0.035 0.104 106 8.83 0.57 0.147 ( 0.209) 0.037 0.110 107 8.92 0.57 0.147 ( 0.208) 0.037 0.110 108 9.00 0.57 0.147 ( 0.207) 0.037 0.110 109 9.08 0.63 0.164 ( 0.206) 0.041 0.123 110 9.17 0.63 0.164 ( 0.205) 0.041 0.123 111 9.25 0.63 0.164 ( 0.204) 0.041 0.123 112 9.33 0.67 0.173 ( 0.203) 0.043 0.130 113 9.42 0.67 0.173 ( 0.202) 0.043 0.130 114 9.50 0.67 0.173 ( 0.201) 0.043 0.130 115 9.58 0.70 0.182 ( 0.200) 0.045 0.136 116 9.67 0.70 0.182 ( 0.199) 0.045 0.136 117 9.75 0.70 0.182 ( 0.198) 0.045 0.136 118 9.83 0.73 0.190 ( 0.197) 0.048 0.143 119 9.92 0.73 0.190 ( 0.196) 0.048 0.143 120 10.00 0.73 0.190 ( 0.195) 0.048 0.143 121 10.08 0.50 0.130 ( 0.194) 0.032 0.097 122 10.17 0.50 0.130 ( 0.193) 0.032 0.097 123 10.25 0.50 0.130 ( 0.193) 0.032 0.097 124 10.33 0.50 0.130 ( 0.192) 0.032 0.097 125 10.42 0.50 0.130 ( 0.191) 0.032 0.097 126 10.50 0.50 0.130 ( 0.190) 0.032 0.097 127 10.58 0.67 0.173 ( 0.189) 0.043 0.130 128 10.67 0.67 0.173 ( 0.188) 0.043 0.130 129 10.75 0.67 0.173 ( 0.187) 0.043 0.130 130 10.83 0.67 0.173 ( 0.186) 0.043 0.130 131 10.92 0.67 0.173 ( 0.185) 0.043 0.130 132 11.00 0.67 0.173 ( 0.184) 0.043 0.130 133 11.08 0.63 0.164 ( 0.183) 0.041 0.123 134 11.17 0.63 0.164 ( 0.182) 0.041 0.123 135 11.25 0.63 0.164 ( 0.181) 0.041 0.123 136 11.33 0.63 0.164 ( 0.181) 0.041 0.123 137 11.42 0.63 0.164 ( 0.180) 0.041 0.123 138 11.50 0.63 0.164 ( 0.179) 0.041 0.123 139 11.58 0.57 0.147 ( 0.178) 0.037 0.110 140 11.67 0.57 0.147 ( 0.177) 0.037 0.110 141 11.75 0.57 0.147 ( 0.176) 0.037 0.110 142 11.83 0.60 0.156 ( 0.175) 0.039 0.117 143 11.92 0.60 0.156 ( 0.174) 0.039 0.117 144 12.00 0.60 0.156 ( 0.174) 0.039 0.117 145 12.08 0.83 0.216 ( 0.173) 0.054 0.162 146 12.17 0.83 0.216 ( 0.172) 0.054 0.162 147 12.25 0.83 0.216 ( 0.171) 0.054 0.162 148 12.33 0.87 0.225 ( 0.170) 0.056 0.169 149 12.42 0.87 0.225 ( 0.169) 0.056 0.169 150 12.50 0.87 0.225 ( 0.168) 0.056 0.169 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 151 12.58 0.93 0.242 ( 0.168) 0.061 0.182 152 12.67 0.93 0.242 ( 0.167) 0.061 0.182 153 12.75 0.93 0.242 ( 0.166) 0.061 0.182 154 12.83 0.97 0.251 ( 0.165) 0.063 0.188 155 12.92 0.97 0.251 ( 0.164) 0.063 0.188 156 13.00 0.97 0.251 ( 0.163) 0.063 0.188 157 13.08 1.13 0.294 ( 0.163) 0.074 0.221 158 13.17 1.13 0.294 ( 0.162) 0.074 0.221 159 13.25 1.13 0.294 ( 0.161) 0.074 0.221 160 13.33 1.13 0.294 ( 0.160) 0.074 0.221 161 13.42 1.13 0.294 ( 0.159) 0.074 0.221 162 13.50 1.13 0.294 ( 0.158) 0.074 0.221 163 13.58 0.77 0.199 ( 0.158) 0.050 0.149 164 13.67 0.77 0.199 ( 0.157) 0.050 0.149 165 13.75 0.77 0.199 ( 0.156) 0.050 0.149 166 13.83 0.77 0.199 ( 0.155) 0.050 0.149 167 13.92 0.77 0.199 ( 0.154) 0.050 0.149 168 14.00 0.77 0.199 ( 0.154) 0.050 0.149 169 14.08 0.90 0.234 ( 0.153) 0.058 0.175 170 14.17 0.90 0.234 ( 0.152) 0.058 0.175 171 14.25 0.90 0.234 ( 0.151) 0.058 0.175 172 14.33 0.87 0.225 ( 0.151) 0.056 0.169 173 14.42 0.87 0.225 ( 0.150) 0.056 0.169 174 14.50 0.87 0.225 ( 0.149) 0.056 0.169 175 14.58 0.87 0.225 ( 0.148) 0.056 0.169 176 14.67 0.87 0.225 ( 0.147) 0.056 0.169 177 14.75 0.87 0.225 ( 0.147) 0.056 0.169 178 14.83 0.83 0.216 ( 0.146) 0.054 0.162 179 14.92 0.83 0.216 ( 0.145) 0.054 0.162 180 15.00 0.83 0.216 ( 0.144) 0.054 0.162 181 15.08 0.80 0.208 ( 0.144) 0.052 0.156 182 15.17 0.80 0.208 ( 0.143) 0.052 0.156 183 15.25 0.80 0.208 ( 0.142) 0.052 0.156 184 15.33 0.77 0.199 ( 0.142) 0.050 0.149 185 15.42 0.77 0.199 ( 0.141) 0.050 0.149 186 15.50 0.77 0.199 ( 0.140) 0.050 0.149 187 15.58 0.63 0.164 ( 0.139) 0.041 0.123 188 15.67 0.63 0.164 ( 0.139) 0.041 0.123 189 15.75 0.63 0.164 ( 0.138) 0.041 0.123 190 15.83 0.63 0.164 ( 0.137) 0.041 0.123 191 15.92 0.63 0.164 ( 0.137) 0.041 0.123 192 16.00 0.63 0.164 ( 0.136) 0.041 0.123 193 16.08 0.13 0.035 ( 0.135) 0.009 0.026 194 16.17 0.13 0.035 ( 0.134) 0.009 0.026 195 16.25 0.13 0.035 ( 0.134) 0.009 0.026 196 16.33 0.13 0.035 ( 0.133) 0.009 0.026 197 16.42 0.13 0.035 ( 0.132) 0.009 0.026 198 16.50 0.13 0.035 ( 0.132) 0.009 0.026 199 16.58 0.10 0.026 ( 0.131) 0.006 0.019 200 16.67 0.10 0.026 ( 0.130) 0.006 0.019 201 16.75 0.10 0.026 ( 0.130) 0.006 0.019 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 202 16.83 0.10 0.026 ( 0.129) 0.006 0.019 203 16.92 0.10 0.026 ( 0.128) 0.006 0.019 204 17.00 0.10 0.026 ( 0.128) 0.006 0.019 205 17.08 0.17 0.043 ( 0.127) 0.011 0.032 206 17.17 0.17 0.043 ( 0.126) 0.011 0.032 207 17.25 0.17 0.043 ( 0.126) 0.011 0.032 208 17.33 0.17 0.043 ( 0.125) 0.011 0.032 209 17.42 0.17 0.043 ( 0.125) 0.011 0.032 210 17.50 0.17 0.043 ( 0.124) 0.011 0.032 211 17.58 0.17 0.043 ( 0.123) 0.011 0.032 212 17.67 0.17 0.043 ( 0.123) 0.011 0.032 213 17.75 0.17 0.043 ( 0.122) 0.011 0.032 214 17.83 0.13 0.035 ( 0.122) 0.009 0.026 215 17.92 0.13 0.035 ( 0.121) 0.009 0.026 216 18.00 0.13 0.035 ( 0.120) 0.009 0.026 217 18.08 0.13 0.035 ( 0.120) 0.009 0.026 218 18.17 0.13 0.035 ( 0.119) 0.009 0.026 219 18.25 0.13 0.035 ( 0.119) 0.009 0.026 220 18.33 0.13 0.035 ( 0.118) 0.009 0.026 221 18.42 0.13 0.035 ( 0.117) 0.009 0.026 222 18.50 0.13 0.035 ( 0.117) 0.009 0.026 223 18.58 0.10 0.026 ( 0.116) 0.006 0.019 224 18.67 0.10 0.026 ( 0.116) 0.006 0.019 225 18.75 0.10 0.026 ( 0.115) 0.006 0.019 226 18.83 0.07 0.017 ( 0.115) 0.004 0.013 227 18.92 0.07 0.017 ( 0.114) 0.004 0.013 228 19.00 0.07 0.017 ( 0.114) 0.004 0.013 229 19.08 0.10 0.026 ( 0.113) 0.006 0.019 230 19.17 0.10 0.026 ( 0.112) 0.006 0.019 231 19.25 0.10 0.026 ( 0.112) 0.006 0.019 232 19.33 0.13 0.035 ( 0.111) 0.009 0.026 233 19.42 0.13 0.035 ( 0.111) 0.009 0.026 234 19.50 0.13 0.035 ( 0.110) 0.009 0.026 235 19.58 0.10 0.026 ( 0.110) 0.006 0.019 236 19.67 0.10 0.026 ( 0.109) 0.006 0.019 237 19.75 0.10 0.026 ( 0.109) 0.006 0.019 238 19.83 0.07 0.017 ( 0.108) 0.004 0.013 239 19.92 0.07 0.017 ( 0.108) 0.004 0.013 240 20.00 0.07 0.017 ( 0.107) 0.004 0.013 241 20.08 0.10 0.026 ( 0.107) 0.006 0.019 242 20.17 0.10 0.026 ( 0.106) 0.006 0.019 243 20.25 0.10 0.026 ( 0.106) 0.006 0.019 244 20.33 0.10 0.026 ( 0.106) 0.006 0.019 245 20.42 0.10 0.026 ( 0.105) 0.006 0.019 246 20.50 0.10 0.026 ( 0.105) 0.006 0.019 247 20.58 0.10 0.026 ( 0.104) 0.006 0.019 248 20.67 0.10 0.026 ( 0.104) 0.006 0.019 249 20.75 0.10 0.026 ( 0.103) 0.006 0.019 250 20.83 0.07 0.017 ( 0.103) 0.004 0.013 251 20.92 0.07 0.017 ( 0.103) 0.004 0.013 252 21.00 0.07 0.017 ( 0.102) 0.004 0.013 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 253 21.08 0.10 0.026 ( 0.102) 0.006 0.019 254 21.17 0.10 0.026 ( 0.101) 0.006 0.019 255 21.25 0.10 0.026 ( 0.101) 0.006 0.019 256 21.33 0.07 0.017 ( 0.101) 0.004 0.013 257 21.42 0.07 0.017 ( 0.100) 0.004 0.013 258 21.50 0.07 0.017 ( 0.100) 0.004 0.013 259 21.58 0.10 0.026 ( 0.099) 0.006 0.019 260 21.67 0.10 0.026 ( 0.099) 0.006 0.019 261 21.75 0.10 0.026 ( 0.099) 0.006 0.019 262 21.83 0.07 0.017 ( 0.098) 0.004 0.013 263 21.92 0.07 0.017 ( 0.098) 0.004 0.013 264 22.00 0.07 0.017 ( 0.098) 0.004 0.013 265 22.08 0.10 0.026 ( 0.097) 0.006 0.019 266 22.17 0.10 0.026 ( 0.097) 0.006 0.019 267 22.25 0.10 0.026 ( 0.097) 0.006 0.019 268 22.33 0.07 0.017 ( 0.096) 0.004 0.013 269 22.42 0.07 0.017 ( 0.096) 0.004 0.013 270 22.50 0.07 0.017 ( 0.096) 0.004 0.013 271 22.58 0.07 0.017 ( 0.096) 0.004 0.013 272 22.67 0.07 0.017 ( 0.095) 0.004 0.013 273 22.75 0.07 0.017 ( 0.095) 0.004 0.013 274 22.83 0.07 0.017 ( 0.095) 0.004 0.013 275 22.92 0.07 0.017 ( 0.095) 0.004 0.013 276 23.00 0.07 0.017 ( 0.094) 0.004 0.013 277 23.08 0.07 0.017 ( 0.094) 0.004 0.013 278 23.17 0.07 0.017 ( 0.094) 0.004 0.013 279 23.25 0.07 0.017 ( 0.094) 0.004 0.013 280 23.33 0.07 0.017 ( 0.093) 0.004 0.013 281 23.42 0.07 0.017 ( 0.093) 0.004 0.013 282 23.50 0.07 0.017 ( 0.093) 0.004 0.013 283 23.58 0.07 0.017 ( 0.093) 0.004 0.013 284 23.67 0.07 0.017 ( 0.093) 0.004 0.013 285 23.75 0.07 0.017 ( 0.093) 0.004 0.013 286 23.83 0.07 0.017 ( 0.093) 0.004 0.013 287 23.92 0.07 0.017 ( 0.093) 0.004 0.013 288 24.00 0.07 0.017 ( 0.092) 0.004 0.013 (Loss Rate Not Used)
Sum = 100.0 Sum = 19.5 Flood volume = Effective rainfall 1.62(In)
times area 2.3(Ac.)/[(In)/(Ft.)] = 0.3(Ac.Ft) Total soil loss = 0.54(In)
Total soil loss = 0.102(Ac.Ft)
Total rainfall = 2.16(In)
Flood volume = 13362.1 Cubic Feet
Total soil loss = 4454.0 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 0.503(CFS)
-------------------------------------------------------------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 24 - 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
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices -------------------------------------------------------------------- Hydrograph in 5 Minute intervals ((CFS))
-------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 2.5 5.0 7.5 10.0 ----------------------------------------------------------------------- 0+ 5 0.0000 0.00 Q | | | | 0+10 0.0001 0.01 Q | | | | 0+15 0.0003 0.02 Q | | | | 0+20 0.0005 0.03 Q | | | | 0+25 0.0007 0.04 Q | | | | 0+30 0.0010 0.04 Q | | | | 0+35 0.0013 0.04 Q | | | | 0+40 0.0016 0.04 Q | | | | 0+45 0.0019 0.04 Q | | | | 0+50 0.0022 0.05 Q | | | | 0+55 0.0026 0.05 Q | | | | 1+ 0 0.0029 0.06 Q | | | | 1+ 5 0.0033 0.06 Q | | | | 1+10 0.0037 0.05 Q | | | | 1+15 0.0040 0.05 Q | | | | 1+20 0.0043 0.05 Q | | | | 1+25 0.0046 0.05 Q | | | | 1+30 0.0050 0.04 Q | | | | 1+35 0.0053 0.04 Q | | | | 1+40 0.0056 0.04 Q | | | | 1+45 0.0059 0.04 Q | | | | 1+50 0.0062 0.05 Q | | | | 1+55 0.0065 0.05 Q | | | | 2+ 0 0.0069 0.06 Q | | | | 2+ 5 0.0073 0.06 Q | | | | 2+10 0.0077 0.06 QV | | | | 2+15 0.0081 0.06 QV | | | | 2+20 0.0085 0.06 QV | | | | 2+25 0.0090 0.06 QV | | | | 2+30 0.0094 0.06 QV | | | | 2+35 0.0098 0.06 QV | | | | 2+40 0.0102 0.07 QV | | | | 2+45 0.0107 0.07 QV | | | | 2+50 0.0112 0.07 QV | | | | 2+55 0.0117 0.07 QV | | | | 3+ 0 0.0122 0.07 QV | | | | 3+ 5 0.0128 0.07 QV | | | | 3+10 0.0133 0.07 QV | | | | 3+15 0.0138 0.07 QV | | | | 3+20 0.0143 0.07 QV | | | | 3+25 0.0148 0.07 QV | | | | 3+30 0.0153 0.07 QV | | | | 3+35 0.0158 0.07 Q V | | | | 3+40 0.0163 0.07 Q V | | | | 3+45 0.0168 0.07 Q V | | | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 3+50 0.0174 0.08 Q V | | | | 3+55 0.0179 0.08 Q V | | | | 4+ 0 0.0185 0.09 Q V | | | | 4+ 5 0.0191 0.09 Q V | | | | 4+10 0.0197 0.09 Q V | | | | 4+15 0.0203 0.09 Q V | | | | 4+20 0.0210 0.09 Q V | | | | 4+25 0.0216 0.10 Q V | | | | 4+30 0.0223 0.10 Q V | | | | 4+35 0.0230 0.10 Q V | | | | 4+40 0.0237 0.10 Q V | | | | 4+45 0.0244 0.10 Q V | | | | 4+50 0.0252 0.10 Q V | | | | 4+55 0.0259 0.11 Q V | | | | 5+ 0 0.0267 0.12 Q V | | | | 5+ 5 0.0275 0.11 Q V | | | | 5+10 0.0282 0.10 Q V | | | | 5+15 0.0289 0.10 Q V | | | | 5+20 0.0295 0.09 Q V | | | | 5+25 0.0302 0.10 Q V | | | | 5+30 0.0309 0.10 Q V | | | | 5+35 0.0316 0.10 Q V | | | | 5+40 0.0324 0.11 Q V | | | | 5+45 0.0332 0.12 Q V | | | | 5+50 0.0340 0.12 Q V | | | | 5+55 0.0348 0.12 Q V | | | | 6+ 0 0.0356 0.12 Q V | | | | 6+ 5 0.0364 0.12 Q V | | | | 6+10 0.0373 0.13 Q V | | | | 6+15 0.0382 0.13 Q V | | | | 6+20 0.0391 0.13 Q V | | | | 6+25 0.0400 0.13 Q V | | | | 6+30 0.0409 0.13 Q V | | | | 6+35 0.0419 0.13 Q V | | | | 6+40 0.0428 0.14 Q V | | | | 6+45 0.0438 0.15 Q V | | | | 6+50 0.0448 0.15 Q V | | | | 6+55 0.0459 0.15 Q V | | | | 7+ 0 0.0469 0.15 Q V | | | | 7+ 5 0.0479 0.15 Q V | | | | 7+10 0.0489 0.15 Q V | | | | 7+15 0.0499 0.15 Q V | | | | 7+20 0.0510 0.15 Q V | | | | 7+25 0.0520 0.16 Q V | | | | 7+30 0.0532 0.16 Q V | | | | 7+35 0.0543 0.16 Q V | | | | 7+40 0.0554 0.17 Q V | | | | 7+45 0.0566 0.17 Q V | | | | 7+50 0.0579 0.18 Q V | | | | 7+55 0.0591 0.18 Q V | | | | 8+ 0 0.0604 0.19 Q V | | | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 8+ 5 0.0618 0.19 Q V | | | | 8+10 0.0632 0.21 Q V | | | | 8+15 0.0647 0.22 Q V | | | | 8+20 0.0662 0.22 Q V | | | | 8+25 0.0677 0.22 Q V | | | | 8+30 0.0692 0.22 Q V| | | | 8+35 0.0708 0.22 Q V| | | | 8+40 0.0724 0.23 Q V| | | | 8+45 0.0740 0.23 Q V| | | | 8+50 0.0756 0.24 Q V| | | | 8+55 0.0773 0.24 Q V | | | 9+ 0 0.0790 0.25 Q V | | | 9+ 5 0.0808 0.25 |Q V | | | 9+10 0.0826 0.27 |Q V | | | 9+15 0.0845 0.28 |Q |V | | | 9+20 0.0864 0.28 |Q |V | | | 9+25 0.0884 0.29 |Q |V | | | 9+30 0.0904 0.29 |Q |V | | | 9+35 0.0924 0.30 |Q | V | | | 9+40 0.0945 0.30 |Q | V | | | 9+45 0.0967 0.31 |Q | V | | | 9+50 0.0988 0.31 |Q | V | | | 9+55 0.1010 0.32 |Q | V | | | 10+ 0 0.1032 0.32 |Q | V | | | 10+ 5 0.1054 0.32 |Q | V | | | 10+10 0.1073 0.27 |Q | V | | | 10+15 0.1090 0.24 Q | V | | | 10+20 0.1106 0.23 Q | V | | | 10+25 0.1122 0.23 Q | V | | | 10+30 0.1137 0.23 Q | V | | | 10+35 0.1153 0.23 Q | V | | | 10+40 0.1171 0.26 |Q | V | | | 10+45 0.1190 0.28 |Q | V | | | 10+50 0.1210 0.29 |Q | V | | | 10+55 0.1230 0.29 |Q | V | | | 11+ 0 0.1251 0.30 |Q | V | | | 11+ 5 0.1271 0.29 |Q | V | | | 11+10 0.1291 0.29 |Q | V | | | 11+15 0.1310 0.29 |Q | V | | | 11+20 0.1330 0.28 |Q | V | | | 11+25 0.1349 0.28 |Q | V | | | 11+30 0.1369 0.28 |Q | V | | | 11+35 0.1388 0.28 |Q | V | | | 11+40 0.1407 0.27 |Q | V | | | 11+45 0.1424 0.26 |Q | V | | | 11+50 0.1442 0.26 |Q | V | | | 11+55 0.1460 0.26 |Q | V| | | 12+ 0 0.1478 0.26 |Q | V| | | 12+ 5 0.1497 0.27 |Q | V| | | 12+10 0.1519 0.32 |Q | V| | | 12+15 0.1543 0.35 |Q | V | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 12+20 0.1568 0.36 |Q | V | | 12+25 0.1594 0.37 |Q | V | | 12+30 0.1620 0.38 |Q | |V | | 12+35 0.1646 0.39 |Q | |V | | 12+40 0.1674 0.40 |Q | |V | | 12+45 0.1702 0.41 |Q | | V | | 12+50 0.1730 0.41 |Q | | V | | 12+55 0.1760 0.42 |Q | | V | | 13+ 0 0.1789 0.43 |Q | | V | | 13+ 5 0.1819 0.43 |Q | | V | | 13+10 0.1851 0.47 |Q | | V | | 13+15 0.1885 0.49 |Q | | V | | 13+20 0.1919 0.50 |Q | | V | | 13+25 0.1953 0.50 | Q | | V | | 13+30 0.1988 0.50 | Q | | V | | 13+35 0.2022 0.49 |Q | | V | | 13+40 0.2051 0.42 |Q | | V | | 13+45 0.2077 0.38 |Q | | V | | 13+50 0.2102 0.36 |Q | | V | | 13+55 0.2126 0.35 |Q | | V | | 14+ 0 0.2149 0.35 |Q | | V | | 14+ 5 0.2173 0.35 |Q | | V | | 14+10 0.2199 0.37 |Q | | V | | 14+15 0.2226 0.39 |Q | | V| | 14+20 0.2253 0.39 |Q | | V| | 14+25 0.2280 0.39 |Q | | V| | 14+30 0.2306 0.39 |Q | | V | 14+35 0.2333 0.39 |Q | | V | 14+40 0.2360 0.39 |Q | | V | 14+45 0.2386 0.39 |Q | | |V | 14+50 0.2413 0.39 |Q | | |V | 14+55 0.2439 0.38 |Q | | |V | 15+ 0 0.2465 0.37 |Q | | | V | 15+ 5 0.2490 0.37 |Q | | | V | 15+10 0.2515 0.36 |Q | | | V | 15+15 0.2540 0.36 |Q | | | V | 15+20 0.2565 0.36 |Q | | | V | 15+25 0.2589 0.35 |Q | | | V | 15+30 0.2613 0.35 |Q | | | V | 15+35 0.2636 0.34 |Q | | | V | 15+40 0.2658 0.31 |Q | | | V | 15+45 0.2678 0.30 |Q | | | V | 15+50 0.2698 0.29 |Q | | | V | 15+55 0.2717 0.29 |Q | | | V | 16+ 0 0.2737 0.28 |Q | | | V | 16+ 5 0.2755 0.27 |Q | | | V | 16+10 0.2767 0.17 Q | | | V | 16+15 0.2774 0.11 Q | | | V | 16+20 0.2780 0.08 Q | | | V | 16+25 0.2785 0.07 Q | | | V | 16+30 0.2790 0.06 Q | | | V | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 16+35 0.2794 0.06 Q | | | V | 16+40 0.2798 0.05 Q | | | V | 16+45 0.2801 0.05 Q | | | V | 16+50 0.2804 0.05 Q | | | V | 16+55 0.2807 0.05 Q | | | V | 17+ 0 0.2810 0.04 Q | | | V | 17+ 5 0.2814 0.05 Q | | | V | 17+10 0.2818 0.06 Q | | | V | 17+15 0.2822 0.07 Q | | | V | 17+20 0.2827 0.07 Q | | | V | 17+25 0.2832 0.07 Q | | | V | 17+30 0.2837 0.07 Q | | | V | 17+35 0.2842 0.07 Q | | | V | 17+40 0.2847 0.07 Q | | | V | 17+45 0.2853 0.07 Q | | | V | 17+50 0.2858 0.07 Q | | | V | 17+55 0.2862 0.07 Q | | | V | 18+ 0 0.2866 0.06 Q | | | V | 18+ 5 0.2871 0.06 Q | | | V | 18+10 0.2875 0.06 Q | | | V | 18+15 0.2879 0.06 Q | | | V | 18+20 0.2883 0.06 Q | | | V | 18+25 0.2887 0.06 Q | | | V | 18+30 0.2891 0.06 Q | | | V | 18+35 0.2895 0.06 Q | | | V | 18+40 0.2899 0.05 Q | | | V | 18+45 0.2902 0.05 Q | | | V | 18+50 0.2905 0.05 Q | | | V | 18+55 0.2908 0.04 Q | | | V | 19+ 0 0.2910 0.03 Q | | | V | 19+ 5 0.2912 0.03 Q | | | V | 19+10 0.2915 0.04 Q | | | V | 19+15 0.2918 0.04 Q | | | V | 19+20 0.2921 0.04 Q | | | V | 19+25 0.2924 0.05 Q | | | V | 19+30 0.2928 0.06 Q | | | V | 19+35 0.2932 0.06 Q | | | V | 19+40 0.2936 0.05 Q | | | V | 19+45 0.2939 0.05 Q | | | V | 19+50 0.2942 0.04 Q | | | V | 19+55 0.2945 0.04 Q | | | V | 20+ 0 0.2947 0.03 Q | | | V | 20+ 5 0.2949 0.03 Q | | | V | 20+10 0.2952 0.04 Q | | | V | 20+15 0.2955 0.04 Q | | | V | 20+20 0.2958 0.04 Q | | | V | 20+25 0.2961 0.04 Q | | | V | 20+30 0.2964 0.04 Q | | | V | 20+35 0.2967 0.04 Q | | | V | 20+40 0.2970 0.04 Q | | | V | 20+45 0.2973 0.04 Q | | | V | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 20+50 0.2976 0.04 Q | | | V | 20+55 0.2978 0.04 Q | | | V | 21+ 0 0.2981 0.03 Q | | | V | 21+ 5 0.2983 0.03 Q | | | V | 21+10 0.2986 0.04 Q | | | V | 21+15 0.2988 0.04 Q | | | V | 21+20 0.2991 0.04 Q | | | V| 21+25 0.2994 0.04 Q | | | V| 21+30 0.2996 0.03 Q | | | V| 21+35 0.2998 0.03 Q | | | V| 21+40 0.3001 0.04 Q | | | V| 21+45 0.3004 0.04 Q | | | V| 21+50 0.3007 0.04 Q | | | V| 21+55 0.3009 0.04 Q | | | V| 22+ 0 0.3011 0.03 Q | | | V| 22+ 5 0.3014 0.03 Q | | | V| 22+10 0.3016 0.04 Q | | | V| 22+15 0.3019 0.04 Q | | | V| 22+20 0.3022 0.04 Q | | | V| 22+25 0.3024 0.04 Q | | | V| 22+30 0.3027 0.03 Q | | | V| 22+35 0.3029 0.03 Q | | | V| 22+40 0.3031 0.03 Q | | | V| 22+45 0.3033 0.03 Q | | | V| 22+50 0.3035 0.03 Q | | | V| 22+55 0.3037 0.03 Q | | | V| 23+ 0 0.3039 0.03 Q | | | V| 23+ 5 0.3041 0.03 Q | | | V| 23+10 0.3043 0.03 Q | | | V| 23+15 0.3045 0.03 Q | | | V| 23+20 0.3047 0.03 Q | | | V| 23+25 0.3049 0.03 Q | | | V| 23+30 0.3051 0.03 Q | | | V| 23+35 0.3054 0.03 Q | | | V| 23+40 0.3056 0.03 Q | | | V| 23+45 0.3058 0.03 Q | | | V| 23+50 0.3060 0.03 Q | | | V| 23+55 0.3062 0.03 Q | | | V| 24+ 0 0.3064 0.03 Q | | | V| 24+ 5 0.3066 0.03 Q | | | V| 24+10 0.3067 0.01 Q | | | V| 24+15 0.3067 0.01 Q | | | V| 24+20 0.3067 0.00 Q | | | V| 24+25 0.3067 0.00 Q | | | V| 24+30 0.3067 0.00 Q | | | V| 24+35 0.3067 0.00 Q | | | V| 24+40 0.3068 0.00 Q | | | V| 24+45 0.3068 0.00 Q | | | V ----------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 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 - 2018, Version 9.0 Study date 09/25/24 File: RCHEXA110.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6443
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- RCH Garage
EX-A
10 yr Existing
Kimley-Horn
-------------------------------------------------------------------- Drainage Area = 2.27(Ac.) = 0.004 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 2.27(Ac.) =

0.004 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.116 Hr.

Lag time = 6.96 Min.
25% of lag time = 1.74 Min.
40% of lag time = 2.78 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]

2.27 0.50 1.14
100 YEAR Area rainfall data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

2.27 1.10 2.50
STORM EVENT (YEAR) = 10.00
Area Averaged 2-Year Rainfall = 0.500(In)
Area Averaged 100-Year Rainfall = 1.100(In)
Point rain (area averaged) = 0.747(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 0.747(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

2.270 56.00 0.820
Total Area Entered = 2.27(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-2 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

Drainage Area for Depth-Area Areal Adjustment = 2.27(Ac.) =

0.004 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.116 Hr.

Lag time = 6.96 Min.
25% of lag time = 1.74 Min.
40% of lag time = 2.78 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]

2.27 0.80 1.82
100 YEAR Area rainfall data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

2.27 1.80 4.09
STORM EVENT (YEAR) = 10.00
Area Averaged 2-Year Rainfall = 0.800(In)
Area Averaged 100-Year Rainfall = 1.800(In)
Point rain (area averaged) = 1.211(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 1.211(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

2.270 56.00 0.820
Total Area Entered = 2.27(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-2 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

Drainage Area for Depth-Area Areal Adjustment = 2.27(Ac.) =

0.004 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.116 Hr.

Lag time = 6.96 Min.
25% of lag time = 1.74 Min.
40% of lag time = 2.78 Min.

Unit time = 5.00 Min.

Duration of storm = 6 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

2.27 1.00 2.27
100 YEAR Area rainfall data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

2.27 2.50 5.67
STORM EVENT (YEAR) = 10.00
Area Averaged 2-Year Rainfall = 1.000(In)
Area Averaged 100-Year Rainfall = 2.500(In)
Point rain (area averaged) = 1.617(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 1.617(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

2.270 56.00 0.820
Total Area Entered = 2.27(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-2 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

Drainage Area for Depth-Area Areal Adjustment = 2.27(Ac.) =

0.004 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.116 Hr.

Lag time = 6.96 Min.
25% of lag time = 1.74 Min.
40% of lag time = 2.78 Min.

Unit time = 5.00 Min.

Duration of storm = 24 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

2.27 1.60 3.63
100 YEAR Area rainfall data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

2.27 4.00 9.08
STORM EVENT (YEAR) = 10.00
Area Averaged 2-Year Rainfall = 1.600(In)
Area Averaged 100-Year Rainfall = 4.000(In)
Point rain (area averaged) = 2.587(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 2.587(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

2.270 56.00 0.820
Total Area Entered = 2.27(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-2 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

56.0 56.0 0.511 0.820 0.134 1.000 0.134 Sum (F) = 0.134
Area averaged mean soil loss (F) (In/Hr) = 0.134
Minimum soil loss rate ((In/Hr)) = 0.067
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.250
--------------------------------------------------------------------- U n i t H y d r o g r a p h
FOOTHILL S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 71.839 7.478 0.171 2 0.167 143.678 42.579 0.974 3 0.250 215.517 28.152 0.644 4 0.333 287.356 10.698 0.245 5 0.417 359.195 5.830 0.133 6 0.500 431.034 2.898 0.066 7 0.583 502.874 1.029 0.024 8 0.667 574.713 0.577 0.013 9 0.750 646.552 0.483 0.011 10 0.833 718.391 0.275 0.006 Sum = 100.000 Sum= 2.288
----------------------------------------------------------------------- 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 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Unit Time Pattern Storm Rain Loss rate(In./Hr) Effective (Hr.) Percent (In/Hr) Max | Low (In/Hr) 1 0.08 0.07 0.021 ( 0.237) 0.005 0.016 2 0.17 0.07 0.021 ( 0.236) 0.005 0.016 3 0.25 0.07 0.021 ( 0.235) 0.005 0.016 4 0.33 0.10 0.031 ( 0.234) 0.008 0.023 5 0.42 0.10 0.031 ( 0.234) 0.008 0.023 6 0.50 0.10 0.031 ( 0.233) 0.008 0.023 7 0.58 0.10 0.031 ( 0.232) 0.008 0.023 8 0.67 0.10 0.031 ( 0.231) 0.008 0.023 9 0.75 0.10 0.031 ( 0.230) 0.008 0.023 10 0.83 0.13 0.041 ( 0.229) 0.010 0.031 11 0.92 0.13 0.041 ( 0.228) 0.010 0.031 12 1.00 0.13 0.041 ( 0.227) 0.010 0.031 13 1.08 0.10 0.031 ( 0.226) 0.008 0.023 14 1.17 0.10 0.031 ( 0.225) 0.008 0.023 15 1.25 0.10 0.031 ( 0.225) 0.008 0.023 16 1.33 0.10 0.031 ( 0.224) 0.008 0.023 17 1.42 0.10 0.031 ( 0.223) 0.008 0.023 18 1.50 0.10 0.031 ( 0.222) 0.008 0.023 19 1.58 0.10 0.031 ( 0.221) 0.008 0.023 20 1.67 0.10 0.031 ( 0.220) 0.008 0.023 21 1.75 0.10 0.031 ( 0.219) 0.008 0.023 22 1.83 0.13 0.041 ( 0.218) 0.010 0.031 23 1.92 0.13 0.041 ( 0.217) 0.010 0.031 24 2.00 0.13 0.041 ( 0.217) 0.010 0.031 25 2.08 0.13 0.041 ( 0.216) 0.010 0.031 26 2.17 0.13 0.041 ( 0.215) 0.010 0.031 27 2.25 0.13 0.041 ( 0.214) 0.010 0.031 28 2.33 0.13 0.041 ( 0.213) 0.010 0.031 29 2.42 0.13 0.041 ( 0.212) 0.010 0.031 30 2.50 0.13 0.041 ( 0.211) 0.010 0.031 31 2.58 0.17 0.052 ( 0.210) 0.013 0.039 32 2.67 0.17 0.052 ( 0.210) 0.013 0.039 33 2.75 0.17 0.052 ( 0.209) 0.013 0.039 34 2.83 0.17 0.052 ( 0.208) 0.013 0.039 35 2.92 0.17 0.052 ( 0.207) 0.013 0.039 36 3.00 0.17 0.052 ( 0.206) 0.013 0.039 37 3.08 0.17 0.052 ( 0.205) 0.013 0.039 38 3.17 0.17 0.052 ( 0.204) 0.013 0.039 39 3.25 0.17 0.052 ( 0.204) 0.013 0.039 40 3.33 0.17 0.052 ( 0.203) 0.013 0.039 41 3.42 0.17 0.052 ( 0.202) 0.013 0.039 42 3.50 0.17 0.052 ( 0.201) 0.013 0.039 43 3.58 0.17 0.052 ( 0.200) 0.013 0.039 44 3.67 0.17 0.052 ( 0.199) 0.013 0.039 45 3.75 0.17 0.052 ( 0.199) 0.013 0.039 46 3.83 0.20 0.062 ( 0.198) 0.016 0.047 47 3.92 0.20 0.062 ( 0.197) 0.016 0.047 48 4.00 0.20 0.062 ( 0.196) 0.016 0.047 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 49 4.08 0.20 0.062 ( 0.195) 0.016 0.047 50 4.17 0.20 0.062 ( 0.194) 0.016 0.047 51 4.25 0.20 0.062 ( 0.194) 0.016 0.047 52 4.33 0.23 0.072 ( 0.193) 0.018 0.054 53 4.42 0.23 0.072 ( 0.192) 0.018 0.054 54 4.50 0.23 0.072 ( 0.191) 0.018 0.054 55 4.58 0.23 0.072 ( 0.190) 0.018 0.054 56 4.67 0.23 0.072 ( 0.189) 0.018 0.054 57 4.75 0.23 0.072 ( 0.189) 0.018 0.054 58 4.83 0.27 0.083 ( 0.188) 0.021 0.062 59 4.92 0.27 0.083 ( 0.187) 0.021 0.062 60 5.00 0.27 0.083 ( 0.186) 0.021 0.062 61 5.08 0.20 0.062 ( 0.185) 0.016 0.047 62 5.17 0.20 0.062 ( 0.185) 0.016 0.047 63 5.25 0.20 0.062 ( 0.184) 0.016 0.047 64 5.33 0.23 0.072 ( 0.183) 0.018 0.054 65 5.42 0.23 0.072 ( 0.182) 0.018 0.054 66 5.50 0.23 0.072 ( 0.181) 0.018 0.054 67 5.58 0.27 0.083 ( 0.181) 0.021 0.062 68 5.67 0.27 0.083 ( 0.180) 0.021 0.062 69 5.75 0.27 0.083 ( 0.179) 0.021 0.062 70 5.83 0.27 0.083 ( 0.178) 0.021 0.062 71 5.92 0.27 0.083 ( 0.177) 0.021 0.062 72 6.00 0.27 0.083 ( 0.177) 0.021 0.062 73 6.08 0.30 0.093 ( 0.176) 0.023 0.070 74 6.17 0.30 0.093 ( 0.175) 0.023 0.070 75 6.25 0.30 0.093 ( 0.174) 0.023 0.070 76 6.33 0.30 0.093 ( 0.174) 0.023 0.070 77 6.42 0.30 0.093 ( 0.173) 0.023 0.070 78 6.50 0.30 0.093 ( 0.172) 0.023 0.070 79 6.58 0.33 0.103 ( 0.171) 0.026 0.078 80 6.67 0.33 0.103 ( 0.170) 0.026 0.078 81 6.75 0.33 0.103 ( 0.170) 0.026 0.078 82 6.83 0.33 0.103 ( 0.169) 0.026 0.078 83 6.92 0.33 0.103 ( 0.168) 0.026 0.078 84 7.00 0.33 0.103 ( 0.167) 0.026 0.078 85 7.08 0.33 0.103 ( 0.167) 0.026 0.078 86 7.17 0.33 0.103 ( 0.166) 0.026 0.078 87 7.25 0.33 0.103 ( 0.165) 0.026 0.078 88 7.33 0.37 0.114 ( 0.164) 0.028 0.085 89 7.42 0.37 0.114 ( 0.164) 0.028 0.085 90 7.50 0.37 0.114 ( 0.163) 0.028 0.085 91 7.58 0.40 0.124 ( 0.162) 0.031 0.093 92 7.67 0.40 0.124 ( 0.161) 0.031 0.093 93 7.75 0.40 0.124 ( 0.161) 0.031 0.093 94 7.83 0.43 0.135 ( 0.160) 0.034 0.101 95 7.92 0.43 0.135 ( 0.159) 0.034 0.101 96 8.00 0.43 0.135 ( 0.158) 0.034 0.101 97 8.08 0.50 0.155 ( 0.158) 0.039 0.116 98 8.17 0.50 0.155 ( 0.157) 0.039 0.116 99 8.25 0.50 0.155 ( 0.156) 0.039 0.116 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 100 8.33 0.50 0.155 ( 0.155) 0.039 0.116 101 8.42 0.50 0.155 ( 0.155) 0.039 0.116 102 8.50 0.50 0.155 ( 0.154) 0.039 0.116 103 8.58 0.53 0.166 ( 0.153) 0.041 0.124 104 8.67 0.53 0.166 ( 0.153) 0.041 0.124 105 8.75 0.53 0.166 ( 0.152) 0.041 0.124 106 8.83 0.57 0.176 ( 0.151) 0.044 0.132 107 8.92 0.57 0.176 ( 0.150) 0.044 0.132 108 9.00 0.57 0.176 ( 0.150) 0.044 0.132 109 9.08 0.63 0.197 ( 0.149) 0.049 0.147 110 9.17 0.63 0.197 ( 0.148) 0.049 0.147 111 9.25 0.63 0.197 ( 0.148) 0.049 0.147 112 9.33 0.67 0.207 ( 0.147) 0.052 0.155 113 9.42 0.67 0.207 ( 0.146) 0.052 0.155 114 9.50 0.67 0.207 ( 0.145) 0.052 0.155 115 9.58 0.70 0.217 ( 0.145) 0.054 0.163 116 9.67 0.70 0.217 ( 0.144) 0.054 0.163 117 9.75 0.70 0.217 ( 0.143) 0.054 0.163 118 9.83 0.73 0.228 ( 0.143) 0.057 0.171 119 9.92 0.73 0.228 ( 0.142) 0.057 0.171 120 10.00 0.73 0.228 ( 0.141) 0.057 0.171 121 10.08 0.50 0.155 ( 0.141) 0.039 0.116 122 10.17 0.50 0.155 ( 0.140) 0.039 0.116 123 10.25 0.50 0.155 ( 0.139) 0.039 0.116 124 10.33 0.50 0.155 ( 0.139) 0.039 0.116 125 10.42 0.50 0.155 ( 0.138) 0.039 0.116 126 10.50 0.50 0.155 ( 0.137) 0.039 0.116 127 10.58 0.67 0.207 ( 0.137) 0.052 0.155 128 10.67 0.67 0.207 ( 0.136) 0.052 0.155 129 10.75 0.67 0.207 ( 0.135) 0.052 0.155 130 10.83 0.67 0.207 ( 0.135) 0.052 0.155 131 10.92 0.67 0.207 ( 0.134) 0.052 0.155 132 11.00 0.67 0.207 ( 0.133) 0.052 0.155 133 11.08 0.63 0.197 ( 0.133) 0.049 0.147 134 11.17 0.63 0.197 ( 0.132) 0.049 0.147 135 11.25 0.63 0.197 ( 0.131) 0.049 0.147 136 11.33 0.63 0.197 ( 0.131) 0.049 0.147 137 11.42 0.63 0.197 ( 0.130) 0.049 0.147 138 11.50 0.63 0.197 ( 0.129) 0.049 0.147 139 11.58 0.57 0.176 ( 0.129) 0.044 0.132 140 11.67 0.57 0.176 ( 0.128) 0.044 0.132 141 11.75 0.57 0.176 ( 0.127) 0.044 0.132 142 11.83 0.60 0.186 ( 0.127) 0.047 0.140 143 11.92 0.60 0.186 ( 0.126) 0.047 0.140 144 12.00 0.60 0.186 ( 0.126) 0.047 0.140 145 12.08 0.83 0.259 ( 0.125) 0.065 0.194 146 12.17 0.83 0.259 ( 0.124) 0.065 0.194 147 12.25 0.83 0.259 ( 0.124) 0.065 0.194 148 12.33 0.87 0.269 ( 0.123) 0.067 0.202 149 12.42 0.87 0.269 ( 0.122) 0.067 0.202 150 12.50 0.87 0.269 ( 0.122) 0.067 0.202 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 151 12.58 0.93 0.290 ( 0.121) 0.072 0.217 152 12.67 0.93 0.290 ( 0.121) 0.072 0.217 153 12.75 0.93 0.290 ( 0.120) 0.072 0.217 154 12.83 0.97 0.300 ( 0.119) 0.075 0.225 155 12.92 0.97 0.300 ( 0.119) 0.075 0.225 156 13.00 0.97 0.300 ( 0.118) 0.075 0.225 157 13.08 1.13 0.352 ( 0.118) 0.088 0.264 158 13.17 1.13 0.352 ( 0.117) 0.088 0.264 159 13.25 1.13 0.352 ( 0.116) 0.088 0.264 160 13.33 1.13 0.352 ( 0.116) 0.088 0.264 161 13.42 1.13 0.352 ( 0.115) 0.088 0.264 162 13.50 1.13 0.352 ( 0.115) 0.088 0.264 163 13.58 0.77 0.238 ( 0.114) 0.060 0.179 164 13.67 0.77 0.238 ( 0.113) 0.060 0.179 165 13.75 0.77 0.238 ( 0.113) 0.060 0.179 166 13.83 0.77 0.238 ( 0.112) 0.060 0.179 167 13.92 0.77 0.238 ( 0.112) 0.060 0.179 168 14.00 0.77 0.238 ( 0.111) 0.060 0.179 169 14.08 0.90 0.279 ( 0.111) 0.070 0.210 170 14.17 0.90 0.279 ( 0.110) 0.070 0.210 171 14.25 0.90 0.279 ( 0.109) 0.070 0.210 172 14.33 0.87 0.269 ( 0.109) 0.067 0.202 173 14.42 0.87 0.269 ( 0.108) 0.067 0.202 174 14.50 0.87 0.269 ( 0.108) 0.067 0.202 175 14.58 0.87 0.269 ( 0.107) 0.067 0.202 176 14.67 0.87 0.269 ( 0.107) 0.067 0.202 177 14.75 0.87 0.269 ( 0.106) 0.067 0.202 178 14.83 0.83 0.259 ( 0.106) 0.065 0.194 179 14.92 0.83 0.259 ( 0.105) 0.065 0.194 180 15.00 0.83 0.259 ( 0.105) 0.065 0.194 181 15.08 0.80 0.248 ( 0.104) 0.062 0.186 182 15.17 0.80 0.248 ( 0.103) 0.062 0.186 183 15.25 0.80 0.248 ( 0.103) 0.062 0.186 184 15.33 0.77 0.238 ( 0.102) 0.060 0.179 185 15.42 0.77 0.238 ( 0.102) 0.060 0.179 186 15.50 0.77 0.238 ( 0.101) 0.060 0.179 187 15.58 0.63 0.197 ( 0.101) 0.049 0.147 188 15.67 0.63 0.197 ( 0.100) 0.049 0.147 189 15.75 0.63 0.197 ( 0.100) 0.049 0.147 190 15.83 0.63 0.197 ( 0.099) 0.049 0.147 191 15.92 0.63 0.197 ( 0.099) 0.049 0.147 192 16.00 0.63 0.197 ( 0.098) 0.049 0.147 193 16.08 0.13 0.041 ( 0.098) 0.010 0.031 194 16.17 0.13 0.041 ( 0.097) 0.010 0.031 195 16.25 0.13 0.041 ( 0.097) 0.010 0.031 196 16.33 0.13 0.041 ( 0.096) 0.010 0.031 197 16.42 0.13 0.041 ( 0.096) 0.010 0.031 198 16.50 0.13 0.041 ( 0.095) 0.010 0.031 199 16.58 0.10 0.031 ( 0.095) 0.008 0.023 200 16.67 0.10 0.031 ( 0.094) 0.008 0.023 201 16.75 0.10 0.031 ( 0.094) 0.008 0.023 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 202 16.83 0.10 0.031 ( 0.093) 0.008 0.023 203 16.92 0.10 0.031 ( 0.093) 0.008 0.023 204 17.00 0.10 0.031 ( 0.092) 0.008 0.023 205 17.08 0.17 0.052 ( 0.092) 0.013 0.039 206 17.17 0.17 0.052 ( 0.092) 0.013 0.039 207 17.25 0.17 0.052 ( 0.091) 0.013 0.039 208 17.33 0.17 0.052 ( 0.091) 0.013 0.039 209 17.42 0.17 0.052 ( 0.090) 0.013 0.039 210 17.50 0.17 0.052 ( 0.090) 0.013 0.039 211 17.58 0.17 0.052 ( 0.089) 0.013 0.039 212 17.67 0.17 0.052 ( 0.089) 0.013 0.039 213 17.75 0.17 0.052 ( 0.088) 0.013 0.039 214 17.83 0.13 0.041 ( 0.088) 0.010 0.031 215 17.92 0.13 0.041 ( 0.087) 0.010 0.031 216 18.00 0.13 0.041 ( 0.087) 0.010 0.031 217 18.08 0.13 0.041 ( 0.087) 0.010 0.031 218 18.17 0.13 0.041 ( 0.086) 0.010 0.031 219 18.25 0.13 0.041 ( 0.086) 0.010 0.031 220 18.33 0.13 0.041 ( 0.085) 0.010 0.031 221 18.42 0.13 0.041 ( 0.085) 0.010 0.031 222 18.50 0.13 0.041 ( 0.085) 0.010 0.031 223 18.58 0.10 0.031 ( 0.084) 0.008 0.023 224 18.67 0.10 0.031 ( 0.084) 0.008 0.023 225 18.75 0.10 0.031 ( 0.083) 0.008 0.023 226 18.83 0.07 0.021 ( 0.083) 0.005 0.016 227 18.92 0.07 0.021 ( 0.083) 0.005 0.016 228 19.00 0.07 0.021 ( 0.082) 0.005 0.016 229 19.08 0.10 0.031 ( 0.082) 0.008 0.023 230 19.17 0.10 0.031 ( 0.081) 0.008 0.023 231 19.25 0.10 0.031 ( 0.081) 0.008 0.023 232 19.33 0.13 0.041 ( 0.081) 0.010 0.031 233 19.42 0.13 0.041 ( 0.080) 0.010 0.031 234 19.50 0.13 0.041 ( 0.080) 0.010 0.031 235 19.58 0.10 0.031 ( 0.079) 0.008 0.023 236 19.67 0.10 0.031 ( 0.079) 0.008 0.023 237 19.75 0.10 0.031 ( 0.079) 0.008 0.023 238 19.83 0.07 0.021 ( 0.078) 0.005 0.016 239 19.92 0.07 0.021 ( 0.078) 0.005 0.016 240 20.00 0.07 0.021 ( 0.078) 0.005 0.016 241 20.08 0.10 0.031 ( 0.077) 0.008 0.023 242 20.17 0.10 0.031 ( 0.077) 0.008 0.023 243 20.25 0.10 0.031 ( 0.077) 0.008 0.023 244 20.33 0.10 0.031 ( 0.076) 0.008 0.023 245 20.42 0.10 0.031 ( 0.076) 0.008 0.023 246 20.50 0.10 0.031 ( 0.076) 0.008 0.023 247 20.58 0.10 0.031 ( 0.075) 0.008 0.023 248 20.67 0.10 0.031 ( 0.075) 0.008 0.023 249 20.75 0.10 0.031 ( 0.075) 0.008 0.023 250 20.83 0.07 0.021 ( 0.074) 0.005 0.016 251 20.92 0.07 0.021 ( 0.074) 0.005 0.016 252 21.00 0.07 0.021 ( 0.074) 0.005 0.016 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 253 21.08 0.10 0.031 ( 0.074) 0.008 0.023 254 21.17 0.10 0.031 ( 0.073) 0.008 0.023 255 21.25 0.10 0.031 ( 0.073) 0.008 0.023 256 21.33 0.07 0.021 ( 0.073) 0.005 0.016 257 21.42 0.07 0.021 ( 0.072) 0.005 0.016 258 21.50 0.07 0.021 ( 0.072) 0.005 0.016 259 21.58 0.10 0.031 ( 0.072) 0.008 0.023 260 21.67 0.10 0.031 ( 0.072) 0.008 0.023 261 21.75 0.10 0.031 ( 0.071) 0.008 0.023 262 21.83 0.07 0.021 ( 0.071) 0.005 0.016 263 21.92 0.07 0.021 ( 0.071) 0.005 0.016 264 22.00 0.07 0.021 ( 0.071) 0.005 0.016 265 22.08 0.10 0.031 ( 0.070) 0.008 0.023 266 22.17 0.10 0.031 ( 0.070) 0.008 0.023 267 22.25 0.10 0.031 ( 0.070) 0.008 0.023 268 22.33 0.07 0.021 ( 0.070) 0.005 0.016 269 22.42 0.07 0.021 ( 0.070) 0.005 0.016 270 22.50 0.07 0.021 ( 0.069) 0.005 0.016 271 22.58 0.07 0.021 ( 0.069) 0.005 0.016 272 22.67 0.07 0.021 ( 0.069) 0.005 0.016 273 22.75 0.07 0.021 ( 0.069) 0.005 0.016 274 22.83 0.07 0.021 ( 0.069) 0.005 0.016 275 22.92 0.07 0.021 ( 0.068) 0.005 0.016 276 23.00 0.07 0.021 ( 0.068) 0.005 0.016 277 23.08 0.07 0.021 ( 0.068) 0.005 0.016 278 23.17 0.07 0.021 ( 0.068) 0.005 0.016 279 23.25 0.07 0.021 ( 0.068) 0.005 0.016 280 23.33 0.07 0.021 ( 0.068) 0.005 0.016 281 23.42 0.07 0.021 ( 0.068) 0.005 0.016 282 23.50 0.07 0.021 ( 0.067) 0.005 0.016 283 23.58 0.07 0.021 ( 0.067) 0.005 0.016 284 23.67 0.07 0.021 ( 0.067) 0.005 0.016 285 23.75 0.07 0.021 ( 0.067) 0.005 0.016 286 23.83 0.07 0.021 ( 0.067) 0.005 0.016 287 23.92 0.07 0.021 ( 0.067) 0.005 0.016 288 24.00 0.07 0.021 ( 0.067) 0.005 0.016 (Loss Rate Not Used)
Sum = 100.0 Sum = 23.3 Flood volume = Effective rainfall 1.94(In)
times area 2.3(Ac.)/[(In)/(Ft.)] = 0.4(Ac.Ft) Total soil loss = 0.65(In)
Total soil loss = 0.122(Ac.Ft)
Total rainfall = 2.59(In)
Flood volume = 15990.1 Cubic Feet
Total soil loss = 5330.0 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 0.602(CFS)
-------------------------------------------------------------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 24 - 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
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices -------------------------------------------------------------------- Hydrograph in 5 Minute intervals ((CFS))
-------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 2.5 5.0 7.5 10.0 ----------------------------------------------------------------------- 0+ 5 0.0000 0.00 Q | | | | 0+10 0.0001 0.02 Q | | | | 0+15 0.0003 0.03 Q | | | | 0+20 0.0006 0.03 Q | | | | 0+25 0.0009 0.04 Q | | | | 0+30 0.0012 0.05 Q | | | | 0+35 0.0015 0.05 Q | | | | 0+40 0.0019 0.05 Q | | | | 0+45 0.0023 0.05 Q | | | | 0+50 0.0026 0.05 Q | | | | 0+55 0.0031 0.06 Q | | | | 1+ 0 0.0035 0.07 Q | | | | 1+ 5 0.0040 0.07 Q | | | | 1+10 0.0044 0.06 Q | | | | 1+15 0.0048 0.06 Q | | | | 1+20 0.0052 0.06 Q | | | | 1+25 0.0056 0.05 Q | | | | 1+30 0.0059 0.05 Q | | | | 1+35 0.0063 0.05 Q | | | | 1+40 0.0067 0.05 Q | | | | 1+45 0.0070 0.05 Q | | | | 1+50 0.0074 0.05 Q | | | | 1+55 0.0078 0.06 Q | | | | 2+ 0 0.0083 0.07 Q | | | | 2+ 5 0.0088 0.07 Q | | | | 2+10 0.0093 0.07 QV | | | | 2+15 0.0097 0.07 QV | | | | 2+20 0.0102 0.07 QV | | | | 2+25 0.0107 0.07 QV | | | | 2+30 0.0112 0.07 QV | | | | 2+35 0.0117 0.07 QV | | | | 2+40 0.0123 0.08 QV | | | | 2+45 0.0128 0.08 QV | | | | 2+50 0.0134 0.09 QV | | | | 2+55 0.0140 0.09 QV | | | | 3+ 0 0.0147 0.09 QV | | | | 3+ 5 0.0153 0.09 QV | | | | 3+10 0.0159 0.09 QV | | | | 3+15 0.0165 0.09 QV | | | | 3+20 0.0171 0.09 QV | | | | 3+25 0.0177 0.09 QV | | | | 3+30 0.0183 0.09 QV | | | | 3+35 0.0189 0.09 Q V | | | | 3+40 0.0195 0.09 Q V | | | | 3+45 0.0202 0.09 Q V | | | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 3+50 0.0208 0.09 Q V | | | | 3+55 0.0215 0.10 Q V | | | | 4+ 0 0.0222 0.10 Q V | | | | 4+ 5 0.0229 0.10 Q V | | | | 4+10 0.0236 0.11 Q V | | | | 4+15 0.0243 0.11 Q V | | | | 4+20 0.0251 0.11 Q V | | | | 4+25 0.0259 0.12 Q V | | | | 4+30 0.0267 0.12 Q V | | | | 4+35 0.0275 0.12 Q V | | | | 4+40 0.0284 0.12 Q V | | | | 4+45 0.0293 0.12 Q V | | | | 4+50 0.0301 0.13 Q V | | | | 4+55 0.0310 0.13 Q V | | | | 5+ 0 0.0320 0.14 Q V | | | | 5+ 5 0.0329 0.14 Q V | | | | 5+10 0.0338 0.12 Q V | | | | 5+15 0.0346 0.11 Q V | | | | 5+20 0.0353 0.11 Q V | | | | 5+25 0.0361 0.12 Q V | | | | 5+30 0.0370 0.12 Q V | | | | 5+35 0.0378 0.12 Q V | | | | 5+40 0.0387 0.13 Q V | | | | 5+45 0.0397 0.14 Q V | | | | 5+50 0.0407 0.14 Q V | | | | 5+55 0.0416 0.14 Q V | | | | 6+ 0 0.0426 0.14 Q V | | | | 6+ 5 0.0436 0.14 Q V | | | | 6+10 0.0446 0.15 Q V | | | | 6+15 0.0457 0.16 Q V | | | | 6+20 0.0468 0.16 Q V | | | | 6+25 0.0479 0.16 Q V | | | | 6+30 0.0490 0.16 Q V | | | | 6+35 0.0501 0.16 Q V | | | | 6+40 0.0513 0.17 Q V | | | | 6+45 0.0525 0.17 Q V | | | | 6+50 0.0537 0.18 Q V | | | | 6+55 0.0549 0.18 Q V | | | | 7+ 0 0.0561 0.18 Q V | | | | 7+ 5 0.0573 0.18 Q V | | | | 7+10 0.0585 0.18 Q V | | | | 7+15 0.0598 0.18 Q V | | | | 7+20 0.0610 0.18 Q V | | | | 7+25 0.0623 0.19 Q V | | | | 7+30 0.0636 0.19 Q V | | | | 7+35 0.0649 0.19 Q V | | | | 7+40 0.0663 0.20 Q V | | | | 7+45 0.0678 0.21 Q V | | | | 7+50 0.0692 0.21 Q V | | | | 7+55 0.0708 0.22 Q V | | | | 8+ 0 0.0723 0.23 Q V | | | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 8+ 5 0.0739 0.23 Q V | | | | 8+10 0.0756 0.25 Q V | | | | 8+15 0.0774 0.26 |Q V | | | | 8+20 0.0792 0.26 |Q V | | | | 8+25 0.0810 0.26 |Q V | | | | 8+30 0.0829 0.27 |Q V| | | | 8+35 0.0847 0.27 |Q V| | | | 8+40 0.0866 0.28 |Q V| | | | 8+45 0.0885 0.28 |Q V| | | | 8+50 0.0905 0.28 |Q V| | | | 8+55 0.0925 0.29 |Q V | | | 9+ 0 0.0946 0.30 |Q V | | | 9+ 5 0.0966 0.30 |Q V | | | 9+10 0.0988 0.32 |Q V | | | 9+15 0.1011 0.33 |Q |V | | | 9+20 0.1034 0.33 |Q |V | | | 9+25 0.1058 0.34 |Q |V | | | 9+30 0.1082 0.35 |Q |V | | | 9+35 0.1106 0.35 |Q | V | | | 9+40 0.1131 0.36 |Q | V | | | 9+45 0.1157 0.37 |Q | V | | | 9+50 0.1182 0.37 |Q | V | | | 9+55 0.1209 0.38 |Q | V | | | 10+ 0 0.1235 0.39 |Q | V | | | 10+ 5 0.1261 0.38 |Q | V | | | 10+10 0.1284 0.33 |Q | V | | | 10+15 0.1304 0.29 |Q | V | | | 10+20 0.1323 0.28 |Q | V | | | 10+25 0.1342 0.27 |Q | V | | | 10+30 0.1361 0.27 |Q | V | | | 10+35 0.1380 0.27 |Q | V | | | 10+40 0.1401 0.31 |Q | V | | | 10+45 0.1424 0.34 |Q | V | | | 10+50 0.1448 0.35 |Q | V | | | 10+55 0.1472 0.35 |Q | V | | | 11+ 0 0.1497 0.35 |Q | V | | | 11+ 5 0.1521 0.35 |Q | V | | | 11+10 0.1545 0.35 |Q | V | | | 11+15 0.1568 0.34 |Q | V | | | 11+20 0.1592 0.34 |Q | V | | | 11+25 0.1615 0.34 |Q | V | | | 11+30 0.1638 0.34 |Q | V | | | 11+35 0.1661 0.34 |Q | V | | | 11+40 0.1683 0.32 |Q | V | | | 11+45 0.1705 0.31 |Q | V | | | 11+50 0.1726 0.31 |Q | V | | | 11+55 0.1747 0.31 |Q | V| | | 12+ 0 0.1769 0.32 |Q | V| | | 12+ 5 0.1792 0.33 |Q | V| | | 12+10 0.1818 0.38 |Q | V| | | 12+15 0.1847 0.42 |Q | V | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 12+20 0.1876 0.43 |Q | V | | 12+25 0.1907 0.45 |Q | V | | 12+30 0.1938 0.46 |Q | |V | | 12+35 0.1970 0.46 |Q | |V | | 12+40 0.2003 0.48 |Q | |V | | 12+45 0.2037 0.49 |Q | | V | | 12+50 0.2071 0.49 |Q | | V | | 12+55 0.2106 0.50 | Q | | V | | 13+ 0 0.2141 0.51 | Q | | V | | 13+ 5 0.2176 0.52 | Q | | V | | 13+10 0.2215 0.56 | Q | | V | | 13+15 0.2255 0.58 | Q | | V | | 13+20 0.2296 0.59 | Q | | V | | 13+25 0.2337 0.60 | Q | | V | | 13+30 0.2379 0.60 | Q | | V | | 13+35 0.2419 0.59 | Q | | V | | 13+40 0.2454 0.51 | Q | | V | | 13+45 0.2485 0.45 |Q | | V | | 13+50 0.2515 0.43 |Q | | V | | 13+55 0.2544 0.42 |Q | | V | | 14+ 0 0.2572 0.41 |Q | | V | | 14+ 5 0.2601 0.42 |Q | | V | | 14+10 0.2632 0.45 |Q | | V | | 14+15 0.2664 0.46 |Q | | V| | 14+20 0.2696 0.47 |Q | | V| | 14+25 0.2728 0.47 |Q | | V| | 14+30 0.2760 0.46 |Q | | V | 14+35 0.2792 0.46 |Q | | V | 14+40 0.2824 0.46 |Q | | V | 14+45 0.2856 0.46 |Q | | |V | 14+50 0.2887 0.46 |Q | | |V | 14+55 0.2919 0.45 |Q | | |V | 15+ 0 0.2949 0.45 |Q | | | V | 15+ 5 0.2980 0.44 |Q | | | V | 15+10 0.3010 0.44 |Q | | | V | 15+15 0.3040 0.43 |Q | | | V | 15+20 0.3069 0.43 |Q | | | V | 15+25 0.3098 0.42 |Q | | | V | 15+30 0.3126 0.41 |Q | | | V | 15+35 0.3154 0.41 |Q | | | V | 15+40 0.3180 0.37 |Q | | | V | 15+45 0.3205 0.35 |Q | | | V | 15+50 0.3228 0.35 |Q | | | V | 15+55 0.3252 0.34 |Q | | | V | 16+ 0 0.3275 0.34 |Q | | | V | 16+ 5 0.3297 0.32 |Q | | | V | 16+10 0.3311 0.20 Q | | | V | 16+15 0.3320 0.13 Q | | | V | 16+20 0.3327 0.10 Q | | | V | 16+25 0.3333 0.09 Q | | | V | 16+30 0.3338 0.08 Q | | | V | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 16+35 0.3343 0.07 Q | | | V | 16+40 0.3348 0.06 Q | | | V | 16+45 0.3352 0.06 Q | | | V | 16+50 0.3356 0.06 Q | | | V | 16+55 0.3359 0.05 Q | | | V | 17+ 0 0.3363 0.05 Q | | | V | 17+ 5 0.3367 0.06 Q | | | V | 17+10 0.3372 0.07 Q | | | V | 17+15 0.3377 0.08 Q | | | V | 17+20 0.3383 0.08 Q | | | V | 17+25 0.3389 0.09 Q | | | V | 17+30 0.3395 0.09 Q | | | V | 17+35 0.3401 0.09 Q | | | V | 17+40 0.3407 0.09 Q | | | V | 17+45 0.3414 0.09 Q | | | V | 17+50 0.3420 0.09 Q | | | V | 17+55 0.3425 0.08 Q | | | V | 18+ 0 0.3430 0.07 Q | | | V | 18+ 5 0.3435 0.07 Q | | | V | 18+10 0.3440 0.07 Q | | | V | 18+15 0.3445 0.07 Q | | | V | 18+20 0.3450 0.07 Q | | | V | 18+25 0.3455 0.07 Q | | | V | 18+30 0.3460 0.07 Q | | | V | 18+35 0.3465 0.07 Q | | | V | 18+40 0.3469 0.06 Q | | | V | 18+45 0.3473 0.06 Q | | | V | 18+50 0.3477 0.05 Q | | | V | 18+55 0.3480 0.05 Q | | | V | 19+ 0 0.3482 0.04 Q | | | V | 19+ 5 0.3485 0.04 Q | | | V | 19+10 0.3488 0.05 Q | | | V | 19+15 0.3492 0.05 Q | | | V | 19+20 0.3495 0.05 Q | | | V | 19+25 0.3500 0.06 Q | | | V | 19+30 0.3504 0.07 Q | | | V | 19+35 0.3509 0.07 Q | | | V | 19+40 0.3513 0.06 Q | | | V | 19+45 0.3517 0.06 Q | | | V | 19+50 0.3521 0.05 Q | | | V | 19+55 0.3524 0.05 Q | | | V | 20+ 0 0.3527 0.04 Q | | | V | 20+ 5 0.3529 0.04 Q | | | V | 20+10 0.3532 0.05 Q | | | V | 20+15 0.3536 0.05 Q | | | V | 20+20 0.3539 0.05 Q | | | V | 20+25 0.3543 0.05 Q | | | V | 20+30 0.3547 0.05 Q | | | V | 20+35 0.3550 0.05 Q | | | V | 20+40 0.3554 0.05 Q | | | V | 20+45 0.3558 0.05 Q | | | V | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 20+50 0.3561 0.05 Q | | | V | 20+55 0.3564 0.04 Q | | | V | 21+ 0 0.3567 0.04 Q | | | V | 21+ 5 0.3570 0.04 Q | | | V | 21+10 0.3573 0.05 Q | | | V | 21+15 0.3576 0.05 Q | | | V | 21+20 0.3580 0.05 Q | | | V| 21+25 0.3583 0.04 Q | | | V| 21+30 0.3585 0.04 Q | | | V| 21+35 0.3588 0.04 Q | | | V| 21+40 0.3591 0.05 Q | | | V| 21+45 0.3595 0.05 Q | | | V| 21+50 0.3598 0.05 Q | | | V| 21+55 0.3601 0.04 Q | | | V| 22+ 0 0.3604 0.04 Q | | | V| 22+ 5 0.3606 0.04 Q | | | V| 22+10 0.3609 0.05 Q | | | V| 22+15 0.3613 0.05 Q | | | V| 22+20 0.3616 0.05 Q | | | V| 22+25 0.3619 0.04 Q | | | V| 22+30 0.3622 0.04 Q | | | V| 22+35 0.3625 0.04 Q | | | V| 22+40 0.3627 0.04 Q | | | V| 22+45 0.3630 0.04 Q | | | V| 22+50 0.3632 0.04 Q | | | V| 22+55 0.3634 0.04 Q | | | V| 23+ 0 0.3637 0.04 Q | | | V| 23+ 5 0.3639 0.04 Q | | | V| 23+10 0.3642 0.04 Q | | | V| 23+15 0.3644 0.04 Q | | | V| 23+20 0.3647 0.04 Q | | | V| 23+25 0.3649 0.04 Q | | | V| 23+30 0.3652 0.04 Q | | | V| 23+35 0.3654 0.04 Q | | | V| 23+40 0.3657 0.04 Q | | | V| 23+45 0.3659 0.04 Q | | | V| 23+50 0.3661 0.04 Q | | | V| 23+55 0.3664 0.04 Q | | | V| 24+ 0 0.3666 0.04 Q | | | V| 24+ 5 0.3669 0.03 Q | | | V| 24+10 0.3670 0.02 Q | | | V| 24+15 0.3670 0.01 Q | | | V| 24+20 0.3671 0.00 Q | | | V| 24+25 0.3671 0.00 Q | | | V| 24+30 0.3671 0.00 Q | | | V| 24+35 0.3671 0.00 Q | | | V| 24+40 0.3671 0.00 Q | | | V| 24+45 0.3671 0.00 Q | | | V| ----------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 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 - 2018, Version 9.0 Study date 09/25/24 File: RCHEXA1100.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6443
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- RCH Garage
EX-A
100 yr Existing
Kimley-Horn
-------------------------------------------------------------------- Drainage Area = 2.27(Ac.) = 0.004 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 2.27(Ac.) =

0.004 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.116 Hr.

Lag time = 6.96 Min.
25% of lag time = 1.74 Min.
40% of lag time = 2.78 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]

2.27 0.50 1.14
100 YEAR Area rainfall data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

2.27 1.10 2.50
STORM EVENT (YEAR) = 100.00
Area Averaged 2-Year Rainfall = 0.500(In)
Area Averaged 100-Year Rainfall = 1.100(In)
Point rain (area averaged) = 1.100(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 1.100(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

2.270 56.00 0.820
Total Area Entered = 2.27(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-3 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

Drainage Area for Depth-Area Areal Adjustment = 2.27(Ac.) =

0.004 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.116 Hr.

Lag time = 6.96 Min.
25% of lag time = 1.74 Min.
40% of lag time = 2.78 Min.

Unit time = 5.00 Min.

Duration of storm = 24 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

2.27 1.60 3.63
100 YEAR Area rainfall data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

2.27 4.00 9.08
STORM EVENT (YEAR) = 100.00
Area Averaged 2-Year Rainfall = 1.600(In)
Area Averaged 100-Year Rainfall = 4.000(In)
Point rain (area averaged) = 4.000(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 4.000(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

2.270 56.00 0.820
Total Area Entered = 2.27(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-3 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

56.0 74.8 0.305 0.820 0.080 1.000 0.080 Sum (F) = 0.080
Area averaged mean soil loss (F) (In/Hr) = 0.080
Minimum soil loss rate ((In/Hr)) = 0.040
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.250
--------------------------------------------------------------------- U n i t H y d r o g r a p h
FOOTHILL S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 71.839 7.478 0.171 2 0.167 143.678 42.579 0.974 3 0.250 215.517 28.152 0.644 4 0.333 287.356 10.698 0.245 5 0.417 359.195 5.830 0.133 6 0.500 431.034 2.898 0.066 7 0.583 502.874 1.029 0.024 8 0.667 574.713 0.577 0.013 9 0.750 646.552 0.483 0.011 10 0.833 718.391 0.275 0.006 Sum = 100.000 Sum= 2.288
----------------------------------------------------------------------- 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 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Unit Time Pattern Storm Rain Loss rate(In./Hr) Effective (Hr.) Percent (In/Hr) Max | Low (In/Hr) 1 0.08 0.07 0.032 ( 0.142) 0.008 0.024 2 0.17 0.07 0.032 ( 0.141) 0.008 0.024 3 0.25 0.07 0.032 ( 0.141) 0.008 0.024 4 0.33 0.10 0.048 ( 0.140) 0.012 0.036 5 0.42 0.10 0.048 ( 0.140) 0.012 0.036 6 0.50 0.10 0.048 ( 0.139) 0.012 0.036 7 0.58 0.10 0.048 ( 0.139) 0.012 0.036 8 0.67 0.10 0.048 ( 0.138) 0.012 0.036 9 0.75 0.10 0.048 ( 0.137) 0.012 0.036 10 0.83 0.13 0.064 ( 0.137) 0.016 0.048 11 0.92 0.13 0.064 ( 0.136) 0.016 0.048 12 1.00 0.13 0.064 ( 0.136) 0.016 0.048 13 1.08 0.10 0.048 ( 0.135) 0.012 0.036 14 1.17 0.10 0.048 ( 0.135) 0.012 0.036 15 1.25 0.10 0.048 ( 0.134) 0.012 0.036 16 1.33 0.10 0.048 ( 0.134) 0.012 0.036 17 1.42 0.10 0.048 ( 0.133) 0.012 0.036 18 1.50 0.10 0.048 ( 0.133) 0.012 0.036 19 1.58 0.10 0.048 ( 0.132) 0.012 0.036 20 1.67 0.10 0.048 ( 0.132) 0.012 0.036 21 1.75 0.10 0.048 ( 0.131) 0.012 0.036 22 1.83 0.13 0.064 ( 0.131) 0.016 0.048 23 1.92 0.13 0.064 ( 0.130) 0.016 0.048 24 2.00 0.13 0.064 ( 0.129) 0.016 0.048 25 2.08 0.13 0.064 ( 0.129) 0.016 0.048 26 2.17 0.13 0.064 ( 0.128) 0.016 0.048 27 2.25 0.13 0.064 ( 0.128) 0.016 0.048 28 2.33 0.13 0.064 ( 0.127) 0.016 0.048 29 2.42 0.13 0.064 ( 0.127) 0.016 0.048 30 2.50 0.13 0.064 ( 0.126) 0.016 0.048 31 2.58 0.17 0.080 ( 0.126) 0.020 0.060 32 2.67 0.17 0.080 ( 0.125) 0.020 0.060 33 2.75 0.17 0.080 ( 0.125) 0.020 0.060 34 2.83 0.17 0.080 ( 0.124) 0.020 0.060 35 2.92 0.17 0.080 ( 0.124) 0.020 0.060 36 3.00 0.17 0.080 ( 0.123) 0.020 0.060 37 3.08 0.17 0.080 ( 0.123) 0.020 0.060 38 3.17 0.17 0.080 ( 0.122) 0.020 0.060 39 3.25 0.17 0.080 ( 0.122) 0.020 0.060 40 3.33 0.17 0.080 ( 0.121) 0.020 0.060 41 3.42 0.17 0.080 ( 0.121) 0.020 0.060 42 3.50 0.17 0.080 ( 0.120) 0.020 0.060 43 3.58 0.17 0.080 ( 0.120) 0.020 0.060 44 3.67 0.17 0.080 ( 0.119) 0.020 0.060 45 3.75 0.17 0.080 ( 0.119) 0.020 0.060 46 3.83 0.20 0.096 ( 0.118) 0.024 0.072 47 3.92 0.20 0.096 ( 0.118) 0.024 0.072 48 4.00 0.20 0.096 ( 0.117) 0.024 0.072 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 49 4.08 0.20 0.096 ( 0.117) 0.024 0.072 50 4.17 0.20 0.096 ( 0.116) 0.024 0.072 51 4.25 0.20 0.096 ( 0.116) 0.024 0.072 52 4.33 0.23 0.112 ( 0.115) 0.028 0.084 53 4.42 0.23 0.112 ( 0.115) 0.028 0.084 54 4.50 0.23 0.112 ( 0.114) 0.028 0.084 55 4.58 0.23 0.112 ( 0.114) 0.028 0.084 56 4.67 0.23 0.112 ( 0.113) 0.028 0.084 57 4.75 0.23 0.112 ( 0.113) 0.028 0.084 58 4.83 0.27 0.128 ( 0.112) 0.032 0.096 59 4.92 0.27 0.128 ( 0.112) 0.032 0.096 60 5.00 0.27 0.128 ( 0.111) 0.032 0.096 61 5.08 0.20 0.096 ( 0.111) 0.024 0.072 62 5.17 0.20 0.096 ( 0.110) 0.024 0.072 63 5.25 0.20 0.096 ( 0.110) 0.024 0.072 64 5.33 0.23 0.112 ( 0.109) 0.028 0.084 65 5.42 0.23 0.112 ( 0.109) 0.028 0.084 66 5.50 0.23 0.112 ( 0.108) 0.028 0.084 67 5.58 0.27 0.128 ( 0.108) 0.032 0.096 68 5.67 0.27 0.128 ( 0.107) 0.032 0.096 69 5.75 0.27 0.128 ( 0.107) 0.032 0.096 70 5.83 0.27 0.128 ( 0.107) 0.032 0.096 71 5.92 0.27 0.128 ( 0.106) 0.032 0.096 72 6.00 0.27 0.128 ( 0.106) 0.032 0.096 73 6.08 0.30 0.144 ( 0.105) 0.036 0.108 74 6.17 0.30 0.144 ( 0.105) 0.036 0.108 75 6.25 0.30 0.144 ( 0.104) 0.036 0.108 76 6.33 0.30 0.144 ( 0.104) 0.036 0.108 77 6.42 0.30 0.144 ( 0.103) 0.036 0.108 78 6.50 0.30 0.144 ( 0.103) 0.036 0.108 79 6.58 0.33 0.160 ( 0.102) 0.040 0.120 80 6.67 0.33 0.160 ( 0.102) 0.040 0.120 81 6.75 0.33 0.160 ( 0.101) 0.040 0.120 82 6.83 0.33 0.160 ( 0.101) 0.040 0.120 83 6.92 0.33 0.160 ( 0.101) 0.040 0.120 84 7.00 0.33 0.160 ( 0.100) 0.040 0.120 85 7.08 0.33 0.160 ( 0.100) 0.040 0.120 86 7.17 0.33 0.160 ( 0.099) 0.040 0.120 87 7.25 0.33 0.160 ( 0.099) 0.040 0.120 88 7.33 0.37 0.176 ( 0.098) 0.044 0.132 89 7.42 0.37 0.176 ( 0.098) 0.044 0.132 90 7.50 0.37 0.176 ( 0.097) 0.044 0.132 91 7.58 0.40 0.192 ( 0.097) 0.048 0.144 92 7.67 0.40 0.192 ( 0.096) 0.048 0.144 93 7.75 0.40 0.192 ( 0.096) 0.048 0.144 94 7.83 0.43 0.208 ( 0.096) 0.052 0.156 95 7.92 0.43 0.208 ( 0.095) 0.052 0.156 96 8.00 0.43 0.208 ( 0.095) 0.052 0.156 97 8.08 0.50 0.240 ( 0.094) 0.060 0.180 98 8.17 0.50 0.240 ( 0.094) 0.060 0.180 99 8.25 0.50 0.240 ( 0.093) 0.060 0.180 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 100 8.33 0.50 0.240 ( 0.093) 0.060 0.180 101 8.42 0.50 0.240 ( 0.092) 0.060 0.180 102 8.50 0.50 0.240 ( 0.092) 0.060 0.180 103 8.58 0.53 0.256 ( 0.092) 0.064 0.192 104 8.67 0.53 0.256 ( 0.091) 0.064 0.192 105 8.75 0.53 0.256 ( 0.091) 0.064 0.192 106 8.83 0.57 0.272 ( 0.090) 0.068 0.204 107 8.92 0.57 0.272 ( 0.090) 0.068 0.204 108 9.00 0.57 0.272 ( 0.089) 0.068 0.204 109 9.08 0.63 0.304 ( 0.089) 0.076 0.228 110 9.17 0.63 0.304 ( 0.089) 0.076 0.228 111 9.25 0.63 0.304 ( 0.088) 0.076 0.228 112 9.33 0.67 0.320 ( 0.088) 0.080 0.240 113 9.42 0.67 0.320 ( 0.087) 0.080 0.240 114 9.50 0.67 0.320 ( 0.087) 0.080 0.240 115 9.58 0.70 0.336 ( 0.087) 0.084 0.252 116 9.67 0.70 0.336 ( 0.086) 0.084 0.252 117 9.75 0.70 0.336 ( 0.086) 0.084 0.252 118 9.83 0.73 0.352 0.085 ( 0.088) 0.267 119 9.92 0.73 0.352 0.085 ( 0.088) 0.267 120 10.00 0.73 0.352 0.084 ( 0.088) 0.268 121 10.08 0.50 0.240 ( 0.084) 0.060 0.180 122 10.17 0.50 0.240 ( 0.084) 0.060 0.180 123 10.25 0.50 0.240 ( 0.083) 0.060 0.180 124 10.33 0.50 0.240 ( 0.083) 0.060 0.180 125 10.42 0.50 0.240 ( 0.082) 0.060 0.180 126 10.50 0.50 0.240 ( 0.082) 0.060 0.180 127 10.58 0.67 0.320 ( 0.082) 0.080 0.240 128 10.67 0.67 0.320 ( 0.081) 0.080 0.240 129 10.75 0.67 0.320 ( 0.081) 0.080 0.240 130 10.83 0.67 0.320 ( 0.080) 0.080 0.240 131 10.92 0.67 0.320 ( 0.080) 0.080 0.240 132 11.00 0.67 0.320 0.080 ( 0.080) 0.240 133 11.08 0.63 0.304 ( 0.079) 0.076 0.228 134 11.17 0.63 0.304 ( 0.079) 0.076 0.228 135 11.25 0.63 0.304 ( 0.078) 0.076 0.228 136 11.33 0.63 0.304 ( 0.078) 0.076 0.228 137 11.42 0.63 0.304 ( 0.078) 0.076 0.228 138 11.50 0.63 0.304 ( 0.077) 0.076 0.228 139 11.58 0.57 0.272 ( 0.077) 0.068 0.204 140 11.67 0.57 0.272 ( 0.077) 0.068 0.204 141 11.75 0.57 0.272 ( 0.076) 0.068 0.204 142 11.83 0.60 0.288 ( 0.076) 0.072 0.216 143 11.92 0.60 0.288 ( 0.075) 0.072 0.216 144 12.00 0.60 0.288 ( 0.075) 0.072 0.216 145 12.08 0.83 0.400 0.075 ( 0.100) 0.325 146 12.17 0.83 0.400 0.074 ( 0.100) 0.326 147 12.25 0.83 0.400 0.074 ( 0.100) 0.326 148 12.33 0.87 0.416 0.074 ( 0.104) 0.342 149 12.42 0.87 0.416 0.073 ( 0.104) 0.343 150 12.50 0.87 0.416 0.073 ( 0.104) 0.343 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 151 12.58 0.93 0.448 0.072 ( 0.112) 0.376 152 12.67 0.93 0.448 0.072 ( 0.112) 0.376 153 12.75 0.93 0.448 0.072 ( 0.112) 0.376 154 12.83 0.97 0.464 0.071 ( 0.116) 0.393 155 12.92 0.97 0.464 0.071 ( 0.116) 0.393 156 13.00 0.97 0.464 0.071 ( 0.116) 0.393 157 13.08 1.13 0.544 0.070 ( 0.136) 0.474 158 13.17 1.13 0.544 0.070 ( 0.136) 0.474 159 13.25 1.13 0.544 0.070 ( 0.136) 0.474 160 13.33 1.13 0.544 0.069 ( 0.136) 0.475 161 13.42 1.13 0.544 0.069 ( 0.136) 0.475 162 13.50 1.13 0.544 0.069 ( 0.136) 0.475 163 13.58 0.77 0.368 0.068 ( 0.092) 0.300 164 13.67 0.77 0.368 0.068 ( 0.092) 0.300 165 13.75 0.77 0.368 0.067 ( 0.092) 0.301 166 13.83 0.77 0.368 0.067 ( 0.092) 0.301 167 13.92 0.77 0.368 0.067 ( 0.092) 0.301 168 14.00 0.77 0.368 0.066 ( 0.092) 0.302 169 14.08 0.90 0.432 0.066 ( 0.108) 0.366 170 14.17 0.90 0.432 0.066 ( 0.108) 0.366 171 14.25 0.90 0.432 0.065 ( 0.108) 0.367 172 14.33 0.87 0.416 0.065 ( 0.104) 0.351 173 14.42 0.87 0.416 0.065 ( 0.104) 0.351 174 14.50 0.87 0.416 0.064 ( 0.104) 0.352 175 14.58 0.87 0.416 0.064 ( 0.104) 0.352 176 14.67 0.87 0.416 0.064 ( 0.104) 0.352 177 14.75 0.87 0.416 0.063 ( 0.104) 0.353 178 14.83 0.83 0.400 0.063 ( 0.100) 0.337 179 14.92 0.83 0.400 0.063 ( 0.100) 0.337 180 15.00 0.83 0.400 0.062 ( 0.100) 0.338 181 15.08 0.80 0.384 0.062 ( 0.096) 0.322 182 15.17 0.80 0.384 0.062 ( 0.096) 0.322 183 15.25 0.80 0.384 0.062 ( 0.096) 0.322 184 15.33 0.77 0.368 0.061 ( 0.092) 0.307 185 15.42 0.77 0.368 0.061 ( 0.092) 0.307 186 15.50 0.77 0.368 0.061 ( 0.092) 0.307 187 15.58 0.63 0.304 0.060 ( 0.076) 0.244 188 15.67 0.63 0.304 0.060 ( 0.076) 0.244 189 15.75 0.63 0.304 0.060 ( 0.076) 0.244 190 15.83 0.63 0.304 0.059 ( 0.076) 0.245 191 15.92 0.63 0.304 0.059 ( 0.076) 0.245 192 16.00 0.63 0.304 0.059 ( 0.076) 0.245 193 16.08 0.13 0.064 ( 0.058) 0.016 0.048 194 16.17 0.13 0.064 ( 0.058) 0.016 0.048 195 16.25 0.13 0.064 ( 0.058) 0.016 0.048 196 16.33 0.13 0.064 ( 0.058) 0.016 0.048 197 16.42 0.13 0.064 ( 0.057) 0.016 0.048 198 16.50 0.13 0.064 ( 0.057) 0.016 0.048 199 16.58 0.10 0.048 ( 0.057) 0.012 0.036 200 16.67 0.10 0.048 ( 0.056) 0.012 0.036 201 16.75 0.10 0.048 ( 0.056) 0.012 0.036 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 202 16.83 0.10 0.048 ( 0.056) 0.012 0.036 203 16.92 0.10 0.048 ( 0.056) 0.012 0.036 204 17.00 0.10 0.048 ( 0.055) 0.012 0.036 205 17.08 0.17 0.080 ( 0.055) 0.020 0.060 206 17.17 0.17 0.080 ( 0.055) 0.020 0.060 207 17.25 0.17 0.080 ( 0.054) 0.020 0.060 208 17.33 0.17 0.080 ( 0.054) 0.020 0.060 209 17.42 0.17 0.080 ( 0.054) 0.020 0.060 210 17.50 0.17 0.080 ( 0.054) 0.020 0.060 211 17.58 0.17 0.080 ( 0.053) 0.020 0.060 212 17.67 0.17 0.080 ( 0.053) 0.020 0.060 213 17.75 0.17 0.080 ( 0.053) 0.020 0.060 214 17.83 0.13 0.064 ( 0.053) 0.016 0.048 215 17.92 0.13 0.064 ( 0.052) 0.016 0.048 216 18.00 0.13 0.064 ( 0.052) 0.016 0.048 217 18.08 0.13 0.064 ( 0.052) 0.016 0.048 218 18.17 0.13 0.064 ( 0.052) 0.016 0.048 219 18.25 0.13 0.064 ( 0.051) 0.016 0.048 220 18.33 0.13 0.064 ( 0.051) 0.016 0.048 221 18.42 0.13 0.064 ( 0.051) 0.016 0.048 222 18.50 0.13 0.064 ( 0.051) 0.016 0.048 223 18.58 0.10 0.048 ( 0.050) 0.012 0.036 224 18.67 0.10 0.048 ( 0.050) 0.012 0.036 225 18.75 0.10 0.048 ( 0.050) 0.012 0.036 226 18.83 0.07 0.032 ( 0.050) 0.008 0.024 227 18.92 0.07 0.032 ( 0.049) 0.008 0.024 228 19.00 0.07 0.032 ( 0.049) 0.008 0.024 229 19.08 0.10 0.048 ( 0.049) 0.012 0.036 230 19.17 0.10 0.048 ( 0.049) 0.012 0.036 231 19.25 0.10 0.048 ( 0.048) 0.012 0.036 232 19.33 0.13 0.064 ( 0.048) 0.016 0.048 233 19.42 0.13 0.064 ( 0.048) 0.016 0.048 234 19.50 0.13 0.064 ( 0.048) 0.016 0.048 235 19.58 0.10 0.048 ( 0.048) 0.012 0.036 236 19.67 0.10 0.048 ( 0.047) 0.012 0.036 237 19.75 0.10 0.048 ( 0.047) 0.012 0.036 238 19.83 0.07 0.032 ( 0.047) 0.008 0.024 239 19.92 0.07 0.032 ( 0.047) 0.008 0.024 240 20.00 0.07 0.032 ( 0.046) 0.008 0.024 241 20.08 0.10 0.048 ( 0.046) 0.012 0.036 242 20.17 0.10 0.048 ( 0.046) 0.012 0.036 243 20.25 0.10 0.048 ( 0.046) 0.012 0.036 244 20.33 0.10 0.048 ( 0.046) 0.012 0.036 245 20.42 0.10 0.048 ( 0.045) 0.012 0.036 246 20.50 0.10 0.048 ( 0.045) 0.012 0.036 247 20.58 0.10 0.048 ( 0.045) 0.012 0.036 248 20.67 0.10 0.048 ( 0.045) 0.012 0.036 249 20.75 0.10 0.048 ( 0.045) 0.012 0.036 250 20.83 0.07 0.032 ( 0.045) 0.008 0.024 251 20.92 0.07 0.032 ( 0.044) 0.008 0.024 252 21.00 0.07 0.032 ( 0.044) 0.008 0.024 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 253 21.08 0.10 0.048 ( 0.044) 0.012 0.036 254 21.17 0.10 0.048 ( 0.044) 0.012 0.036 255 21.25 0.10 0.048 ( 0.044) 0.012 0.036 256 21.33 0.07 0.032 ( 0.043) 0.008 0.024 257 21.42 0.07 0.032 ( 0.043) 0.008 0.024 258 21.50 0.07 0.032 ( 0.043) 0.008 0.024 259 21.58 0.10 0.048 ( 0.043) 0.012 0.036 260 21.67 0.10 0.048 ( 0.043) 0.012 0.036 261 21.75 0.10 0.048 ( 0.043) 0.012 0.036 262 21.83 0.07 0.032 ( 0.043) 0.008 0.024 263 21.92 0.07 0.032 ( 0.042) 0.008 0.024 264 22.00 0.07 0.032 ( 0.042) 0.008 0.024 265 22.08 0.10 0.048 ( 0.042) 0.012 0.036 266 22.17 0.10 0.048 ( 0.042) 0.012 0.036 267 22.25 0.10 0.048 ( 0.042) 0.012 0.036 268 22.33 0.07 0.032 ( 0.042) 0.008 0.024 269 22.42 0.07 0.032 ( 0.042) 0.008 0.024 270 22.50 0.07 0.032 ( 0.041) 0.008 0.024 271 22.58 0.07 0.032 ( 0.041) 0.008 0.024 272 22.67 0.07 0.032 ( 0.041) 0.008 0.024 273 22.75 0.07 0.032 ( 0.041) 0.008 0.024 274 22.83 0.07 0.032 ( 0.041) 0.008 0.024 275 22.92 0.07 0.032 ( 0.041) 0.008 0.024 276 23.00 0.07 0.032 ( 0.041) 0.008 0.024 277 23.08 0.07 0.032 ( 0.041) 0.008 0.024 278 23.17 0.07 0.032 ( 0.041) 0.008 0.024 279 23.25 0.07 0.032 ( 0.041) 0.008 0.024 280 23.33 0.07 0.032 ( 0.040) 0.008 0.024 281 23.42 0.07 0.032 ( 0.040) 0.008 0.024 282 23.50 0.07 0.032 ( 0.040) 0.008 0.024 283 23.58 0.07 0.032 ( 0.040) 0.008 0.024 284 23.67 0.07 0.032 ( 0.040) 0.008 0.024 285 23.75 0.07 0.032 ( 0.040) 0.008 0.024 286 23.83 0.07 0.032 ( 0.040) 0.008 0.024 287 23.92 0.07 0.032 ( 0.040) 0.008 0.024 288 24.00 0.07 0.032 ( 0.040) 0.008 0.024 (Loss Rate Not Used)
Sum = 100.0 Sum = 37.8 Flood volume = Effective rainfall 3.15(In)
times area 2.3(Ac.)/[(In)/(Ft.)] = 0.6(Ac.Ft) Total soil loss = 0.85(In)
Total soil loss = 0.162(Ac.Ft)
Total rainfall = 4.00(In)
Flood volume = 25923.7 Cubic Feet
Total soil loss = 7036.5 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 1.082(CFS)
-------------------------------------------------------------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 24 - 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
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices -------------------------------------------------------------------- Hydrograph in 5 Minute intervals ((CFS))
-------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 2.5 5.0 7.5 10.0 ----------------------------------------------------------------------- 0+ 5 0.0000 0.00 Q | | | | 0+10 0.0002 0.03 Q | | | | 0+15 0.0005 0.04 Q | | | | 0+20 0.0009 0.05 Q | | | | 0+25 0.0013 0.07 Q | | | | 0+30 0.0018 0.08 Q | | | | 0+35 0.0024 0.08 Q | | | | 0+40 0.0029 0.08 Q | | | | 0+45 0.0035 0.08 Q | | | | 0+50 0.0041 0.08 Q | | | | 0+55 0.0047 0.10 Q | | | | 1+ 0 0.0054 0.10 Q | | | | 1+ 5 0.0062 0.10 Q | | | | 1+10 0.0068 0.09 Q | | | | 1+15 0.0074 0.09 Q | | | | 1+20 0.0080 0.09 Q | | | | 1+25 0.0086 0.08 Q | | | | 1+30 0.0092 0.08 Q | | | | 1+35 0.0097 0.08 Q | | | | 1+40 0.0103 0.08 Q | | | | 1+45 0.0109 0.08 Q | | | | 1+50 0.0114 0.08 Q | | | | 1+55 0.0121 0.10 Q | | | | 2+ 0 0.0128 0.10 Q | | | | 2+ 5 0.0136 0.11 Q | | | | 2+10 0.0143 0.11 Q | | | | 2+15 0.0151 0.11 QV | | | | 2+20 0.0158 0.11 QV | | | | 2+25 0.0166 0.11 QV | | | | 2+30 0.0173 0.11 QV | | | | 2+35 0.0181 0.11 QV | | | | 2+40 0.0189 0.12 QV | | | | 2+45 0.0199 0.13 QV | | | | 2+50 0.0208 0.13 QV | | | | 2+55 0.0217 0.14 QV | | | | 3+ 0 0.0227 0.14 QV | | | | 3+ 5 0.0236 0.14 QV | | | | 3+10 0.0245 0.14 QV | | | | 3+15 0.0255 0.14 QV | | | | 3+20 0.0264 0.14 QV | | | | 3+25 0.0274 0.14 QV | | | | 3+30 0.0283 0.14 QV | | | | 3+35 0.0293 0.14 QV | | | | 3+40 0.0302 0.14 Q V | | | | 3+45 0.0312 0.14 Q V | | | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 3+50 0.0321 0.14 Q V | | | | 3+55 0.0332 0.15 Q V | | | | 4+ 0 0.0343 0.16 Q V | | | | 4+ 5 0.0354 0.16 Q V | | | | 4+10 0.0365 0.16 Q V | | | | 4+15 0.0376 0.16 Q V | | | | 4+20 0.0388 0.17 Q V | | | | 4+25 0.0400 0.18 Q V | | | | 4+30 0.0413 0.19 Q V | | | | 4+35 0.0426 0.19 Q V | | | | 4+40 0.0439 0.19 Q V | | | | 4+45 0.0452 0.19 Q V | | | | 4+50 0.0466 0.19 Q V | | | | 4+55 0.0480 0.21 Q V | | | | 5+ 0 0.0494 0.21 Q V | | | | 5+ 5 0.0509 0.21 Q V | | | | 5+10 0.0522 0.19 Q V | | | | 5+15 0.0534 0.18 Q V | | | | 5+20 0.0546 0.17 Q V | | | | 5+25 0.0559 0.18 Q V | | | | 5+30 0.0572 0.19 Q V | | | | 5+35 0.0585 0.19 Q V | | | | 5+40 0.0599 0.20 Q V | | | | 5+45 0.0614 0.21 Q V | | | | 5+50 0.0629 0.22 Q V | | | | 5+55 0.0644 0.22 Q V | | | | 6+ 0 0.0659 0.22 Q V | | | | 6+ 5 0.0674 0.22 Q V | | | | 6+10 0.0690 0.23 Q V | | | | 6+15 0.0707 0.24 Q V | | | | 6+20 0.0723 0.24 Q V | | | | 6+25 0.0740 0.25 Q V | | | | 6+30 0.0757 0.25 Q V | | | | 6+35 0.0774 0.25 Q V | | | | 6+40 0.0792 0.26 |Q V | | | | 6+45 0.0811 0.27 |Q V | | | | 6+50 0.0830 0.27 |Q V | | | | 6+55 0.0848 0.27 |Q V | | | | 7+ 0 0.0867 0.27 |Q V | | | | 7+ 5 0.0886 0.27 |Q V | | | | 7+10 0.0905 0.27 |Q V | | | | 7+15 0.0924 0.27 |Q V | | | | 7+20 0.0943 0.28 |Q V | | | | 7+25 0.0963 0.29 |Q V | | | | 7+30 0.0983 0.30 |Q V | | | | 7+35 0.1004 0.30 |Q V | | | | 7+40 0.1026 0.31 |Q V | | | | 7+45 0.1048 0.32 |Q V | | | | 7+50 0.1071 0.33 |Q V | | | | 7+55 0.1094 0.34 |Q V | | | | 8+ 0 0.1118 0.35 |Q V | | | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 8+ 5 0.1143 0.36 |Q V | | | | 8+10 0.1169 0.38 |Q V | | | | 8+15 0.1197 0.40 |Q V | | | | 8+20 0.1225 0.41 |Q V | | | | 8+25 0.1253 0.41 |Q V | | | | 8+30 0.1281 0.41 |Q V | | | | 8+35 0.1310 0.41 |Q V | | | | 8+40 0.1339 0.43 |Q V | | | | 8+45 0.1369 0.43 |Q V| | | | 8+50 0.1399 0.44 |Q V| | | | 8+55 0.1430 0.45 |Q V| | | | 9+ 0 0.1462 0.46 |Q V| | | | 9+ 5 0.1494 0.47 |Q V | | | 9+10 0.1528 0.49 |Q V | | | 9+15 0.1563 0.51 | Q V | | | 9+20 0.1599 0.52 | Q V | | | 9+25 0.1635 0.53 | Q V | | | 9+30 0.1673 0.54 | Q |V | | | 9+35 0.1710 0.55 | Q |V | | | 9+40 0.1749 0.56 | Q |V | | | 9+45 0.1788 0.57 | Q | V | | | 9+50 0.1828 0.58 | Q | V | | | 9+55 0.1869 0.59 | Q | V | | | 10+ 0 0.1910 0.60 | Q | V | | | 10+ 5 0.1951 0.59 | Q | V | | | 10+10 0.1986 0.51 | Q | V | | | 10+15 0.2017 0.45 |Q | V | | | 10+20 0.2047 0.43 |Q | V | | | 10+25 0.2076 0.42 |Q | V | | | 10+30 0.2105 0.42 |Q | V | | | 10+35 0.2134 0.42 |Q | V | | | 10+40 0.2168 0.48 |Q | V | | | 10+45 0.2203 0.52 | Q | V | | | 10+50 0.2240 0.53 | Q | V | | | 10+55 0.2277 0.54 | Q | V | | | 11+ 0 0.2315 0.55 | Q | V | | | 11+ 5 0.2353 0.55 | Q | V | | | 11+10 0.2389 0.53 | Q | V | | | 11+15 0.2426 0.53 | Q | V | | | 11+20 0.2462 0.52 | Q | V | | | 11+25 0.2498 0.52 | Q | V | | | 11+30 0.2534 0.52 | Q | V | | | 11+35 0.2570 0.52 | Q | V | | | 11+40 0.2604 0.49 |Q | V | | | 11+45 0.2637 0.48 |Q | V | | | 11+50 0.2669 0.48 |Q | V | | | 11+55 0.2703 0.48 |Q | V | | | 12+ 0 0.2736 0.49 |Q | V | | | 12+ 5 0.2772 0.51 | Q | V | | | 12+10 0.2814 0.62 | Q | V | | | 12+15 0.2862 0.69 | Q | V| | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 12+20 0.2911 0.72 | Q | V| | | 12+25 0.2963 0.75 | Q | V| | | 12+30 0.3016 0.77 | Q | V | | 12+35 0.3070 0.78 | Q | V | | 12+40 0.3126 0.82 | Q | |V | | 12+45 0.3184 0.84 | Q | |V | | 12+50 0.3243 0.85 | Q | |V | | 12+55 0.3304 0.88 | Q | | V | | 13+ 0 0.3365 0.89 | Q | | V | | 13+ 5 0.3427 0.91 | Q | | V | | 13+10 0.3496 0.99 | Q | | V | | 13+15 0.3567 1.04 | Q | | V | | 13+20 0.3641 1.06 | Q | | V | | 13+25 0.3715 1.08 | Q | | V | | 13+30 0.3789 1.08 | Q | | V | | 13+35 0.3862 1.06 | Q | | V | | 13+40 0.3923 0.89 | Q | | V | | 13+45 0.3976 0.77 | Q | | V | | 13+50 0.4027 0.73 | Q | | V | | 13+55 0.4076 0.71 | Q | | V | | 14+ 0 0.4124 0.70 | Q | | V | | 14+ 5 0.4172 0.71 | Q | | V | | 14+10 0.4225 0.77 | Q | | V | | 14+15 0.4281 0.81 | Q | | V | | 14+20 0.4337 0.82 | Q | | V| | 14+25 0.4393 0.81 | Q | | V| | 14+30 0.4449 0.81 | Q | | V| | 14+35 0.4504 0.81 | Q | | V | 14+40 0.4560 0.81 | Q | | V | 14+45 0.4615 0.81 | Q | | |V | 14+50 0.4671 0.80 | Q | | |V | 14+55 0.4725 0.79 | Q | | |V | 15+ 0 0.4779 0.78 | Q | | | V | 15+ 5 0.4832 0.77 | Q | | | V | 15+10 0.4884 0.76 | Q | | | V | 15+15 0.4935 0.75 | Q | | | V | 15+20 0.4986 0.74 | Q | | | V | 15+25 0.5036 0.72 | Q | | | V | 15+30 0.5085 0.71 | Q | | | V | 15+35 0.5133 0.70 | Q | | | V | 15+40 0.5176 0.63 | Q | | | V | 15+45 0.5217 0.59 | Q | | | V | 15+50 0.5257 0.58 | Q | | | V | 15+55 0.5296 0.57 | Q | | | V | 16+ 0 0.5335 0.56 | Q | | | V | 16+ 5 0.5371 0.53 | Q | | | V | 16+10 0.5394 0.34 |Q | | | V | 16+15 0.5409 0.21 Q | | | V | 16+20 0.5420 0.16 Q | | | V | 16+25 0.5429 0.13 Q | | | V | 16+30 0.5437 0.12 Q | | | V | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 16+35 0.5445 0.11 Q | | | V | 16+40 0.5452 0.10 Q | | | V | 16+45 0.5458 0.09 Q | | | V | 16+50 0.5464 0.09 Q | | | V | 16+55 0.5470 0.08 Q | | | V | 17+ 0 0.5475 0.08 Q | | | V | 17+ 5 0.5481 0.09 Q | | | V | 17+10 0.5489 0.11 Q | | | V | 17+15 0.5498 0.13 Q | | | V | 17+20 0.5507 0.13 Q | | | V | 17+25 0.5516 0.13 Q | | | V | 17+30 0.5525 0.14 Q | | | V | 17+35 0.5535 0.14 Q | | | V | 17+40 0.5544 0.14 Q | | | V | 17+45 0.5554 0.14 Q | | | V | 17+50 0.5563 0.14 Q | | | V | 17+55 0.5571 0.12 Q | | | V | 18+ 0 0.5579 0.12 Q | | | V | 18+ 5 0.5587 0.11 Q | | | V | 18+10 0.5595 0.11 Q | | | V | 18+15 0.5602 0.11 Q | | | V | 18+20 0.5610 0.11 Q | | | V | 18+25 0.5618 0.11 Q | | | V | 18+30 0.5625 0.11 Q | | | V | 18+35 0.5633 0.11 Q | | | V | 18+40 0.5639 0.10 Q | | | V | 18+45 0.5645 0.09 Q | | | V | 18+50 0.5651 0.08 Q | | | V | 18+55 0.5656 0.07 Q | | | V | 19+ 0 0.5660 0.06 Q | | | V | 19+ 5 0.5664 0.06 Q | | | V | 19+10 0.5669 0.07 Q | | | V | 19+15 0.5674 0.08 Q | | | V | 19+20 0.5680 0.08 Q | | | V | 19+25 0.5687 0.09 Q | | | V | 19+30 0.5694 0.10 Q | | | V | 19+35 0.5701 0.10 Q | | | V | 19+40 0.5707 0.09 Q | | | V | 19+45 0.5713 0.09 Q | | | V | 19+50 0.5719 0.08 Q | | | V | 19+55 0.5724 0.07 Q | | | V | 20+ 0 0.5728 0.06 Q | | | V | 20+ 5 0.5732 0.06 Q | | | V | 20+10 0.5737 0.07 Q | | | V | 20+15 0.5742 0.08 Q | | | V | 20+20 0.5748 0.08 Q | | | V | 20+25 0.5754 0.08 Q | | | V | 20+30 0.5759 0.08 Q | | | V | 20+35 0.5765 0.08 Q | | | V | 20+40 0.5771 0.08 Q | | | V | 20+45 0.5776 0.08 Q | | | V | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 20+50 0.5782 0.08 Q | | | V | 20+55 0.5786 0.07 Q | | | V | 21+ 0 0.5791 0.06 Q | | | V | 21+ 5 0.5795 0.06 Q | | | V | 21+10 0.5800 0.07 Q | | | V | 21+15 0.5805 0.08 Q | | | V| 21+20 0.5810 0.08 Q | | | V| 21+25 0.5815 0.07 Q | | | V| 21+30 0.5819 0.06 Q | | | V| 21+35 0.5823 0.06 Q | | | V| 21+40 0.5828 0.07 Q | | | V| 21+45 0.5833 0.08 Q | | | V| 21+50 0.5839 0.08 Q | | | V| 21+55 0.5843 0.07 Q | | | V| 22+ 0 0.5847 0.06 Q | | | V| 22+ 5 0.5852 0.06 Q | | | V| 22+10 0.5856 0.07 Q | | | V| 22+15 0.5862 0.08 Q | | | V| 22+20 0.5867 0.08 Q | | | V| 22+25 0.5872 0.07 Q | | | V| 22+30 0.5876 0.06 Q | | | V| 22+35 0.5880 0.06 Q | | | V| 22+40 0.5884 0.06 Q | | | V| 22+45 0.5887 0.06 Q | | | V| 22+50 0.5891 0.06 Q | | | V| 22+55 0.5895 0.06 Q | | | V| 23+ 0 0.5899 0.06 Q | | | V| 23+ 5 0.5903 0.05 Q | | | V| 23+10 0.5906 0.05 Q | | | V| 23+15 0.5910 0.05 Q | | | V| 23+20 0.5914 0.05 Q | | | V| 23+25 0.5918 0.05 Q | | | V| 23+30 0.5922 0.05 Q | | | V| 23+35 0.5925 0.05 Q | | | V| 23+40 0.5929 0.05 Q | | | V| 23+45 0.5933 0.05 Q | | | V| 23+50 0.5937 0.05 Q | | | V| 23+55 0.5940 0.05 Q | | | V| 24+ 0 0.5944 0.05 Q | | | V| 24+ 5 0.5948 0.05 Q | | | V| 24+10 0.5950 0.03 Q | | | V| 24+15 0.5950 0.01 Q | | | V| 24+20 0.5951 0.01 Q | | | V| 24+25 0.5951 0.00 Q | | | V| 24+30 0.5951 0.00 Q | | | V| 24+35 0.5951 0.00 Q | | | V| 24+40 0.5951 0.00 Q | | | V| 24+45 0.5951 0.00 Q | | | V ----------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 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 - 2018, Version 9.0 Study date 10/07/24 File: rchph1a12.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6443
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- RCH Garage
DMA A
Kimley-Horn
2 yr proposed
-------------------------------------------------------------------- Drainage Area = 1.91(Ac.) = 0.003 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 1.91(Ac.) =

0.003 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.095 Hr.

Lag time = 5.70 Min.
25% of lag time = 1.43 Min.
40% of lag time = 2.28 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]

1.91 0.50 0.95
100 YEAR Area rainfall data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.91 1.10 2.10
STORM EVENT (YEAR) = 2.00
Area Averaged 2-Year Rainfall = 0.500(In)
Area Averaged 100-Year Rainfall = 1.100(In)
Point rain (area averaged) = 0.500(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 0.500(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

1.910 56.00 0.730
Total Area Entered = 1.91(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

Drainage Area for Depth-Area Areal Adjustment = 1.91(Ac.) =

0.003 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.095 Hr.

Lag time = 5.70 Min.
25% of lag time = 1.43 Min.
40% of lag time = 2.28 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]

1.91 0.80 1.53
100 YEAR Area rainfall data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.91 1.80 3.44
STORM EVENT (YEAR) = 2.00
Area Averaged 2-Year Rainfall = 0.800(In)
Area Averaged 100-Year Rainfall = 1.800(In)
Point rain (area averaged) = 0.800(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 0.800(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

1.910 56.00 0.730
Total Area Entered = 1.91(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

Drainage Area for Depth-Area Areal Adjustment = 1.91(Ac.) =

0.003 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.095 Hr.

Lag time = 5.70 Min.
25% of lag time = 1.43 Min.
40% of lag time = 2.28 Min.

Unit time = 5.00 Min.

Duration of storm = 6 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.91 1.00 1.91
100 YEAR Area rainfall data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.91 2.50 4.77
STORM EVENT (YEAR) = 2.00
Area Averaged 2-Year Rainfall = 1.000(In)
Area Averaged 100-Year Rainfall = 2.500(In)
Point rain (area averaged) = 1.000(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 1.000(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

1.910 56.00 0.730
Total Area Entered = 1.91(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

Drainage Area for Depth-Area Areal Adjustment = 1.91(Ac.) =

0.003 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.095 Hr.

Lag time = 5.70 Min.
25% of lag time = 1.43 Min.
40% of lag time = 2.28 Min.

Unit time = 5.00 Min.

Duration of storm = 24 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.91 1.60 3.06
100 YEAR Area rainfall data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.91 4.00 7.64
STORM EVENT (YEAR) = 2.00
Area Averaged 2-Year Rainfall = 1.600(In)
Area Averaged 100-Year Rainfall = 4.000(In)
Point rain (area averaged) = 1.600(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 1.600(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

1.910 56.00 0.730
Total Area Entered = 1.91(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

56.0 36.0 0.706 0.730 0.242 1.000 0.242 Sum (F) = 0.242
Area averaged mean soil loss (F) (In/Hr) = 0.242
Minimum soil loss rate ((In/Hr)) = 0.121
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.320
--------------------------------------------------------------------- U n i t H y d r o g r a p h
FOOTHILL S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 87.719 10.710 0.206 2 0.167 175.439 52.537 1.011 3 0.250 263.158 21.572 0.415 4 0.333 350.877 8.833 0.170 5 0.417 438.596 3.926 0.076 6 0.500 526.316 1.230 0.024 7 0.583 614.035 0.656 0.013 8 0.667 701.754 0.537 0.010 Sum = 100.000 Sum= 1.925
----------------------------------------------------------------------- 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 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices (Hr.) Percent (In/Hr) Max | Low (In/Hr) 1 0.08 0.07 0.013 ( 0.429) 0.004 0.009 2 0.17 0.07 0.013 ( 0.428) 0.004 0.009 3 0.25 0.07 0.013 ( 0.426) 0.004 0.009 4 0.33 0.10 0.019 ( 0.424) 0.006 0.013 5 0.42 0.10 0.019 ( 0.423) 0.006 0.013 6 0.50 0.10 0.019 ( 0.421) 0.006 0.013 7 0.58 0.10 0.019 ( 0.419) 0.006 0.013 8 0.67 0.10 0.019 ( 0.418) 0.006 0.013 9 0.75 0.10 0.019 ( 0.416) 0.006 0.013 10 0.83 0.13 0.026 ( 0.414) 0.008 0.017 11 0.92 0.13 0.026 ( 0.413) 0.008 0.017 12 1.00 0.13 0.026 ( 0.411) 0.008 0.017 13 1.08 0.10 0.019 ( 0.410) 0.006 0.013 14 1.17 0.10 0.019 ( 0.408) 0.006 0.013 15 1.25 0.10 0.019 ( 0.406) 0.006 0.013 16 1.33 0.10 0.019 ( 0.405) 0.006 0.013 17 1.42 0.10 0.019 ( 0.403) 0.006 0.013 18 1.50 0.10 0.019 ( 0.401) 0.006 0.013 19 1.58 0.10 0.019 ( 0.400) 0.006 0.013 20 1.67 0.10 0.019 ( 0.398) 0.006 0.013 21 1.75 0.10 0.019 ( 0.397) 0.006 0.013 22 1.83 0.13 0.026 ( 0.395) 0.008 0.017 23 1.92 0.13 0.026 ( 0.394) 0.008 0.017 24 2.00 0.13 0.026 ( 0.392) 0.008 0.017 25 2.08 0.13 0.026 ( 0.390) 0.008 0.017 26 2.17 0.13 0.026 ( 0.389) 0.008 0.017 27 2.25 0.13 0.026 ( 0.387) 0.008 0.017 28 2.33 0.13 0.026 ( 0.386) 0.008 0.017 29 2.42 0.13 0.026 ( 0.384) 0.008 0.017 30 2.50 0.13 0.026 ( 0.382) 0.008 0.017 31 2.58 0.17 0.032 ( 0.381) 0.010 0.022 32 2.67 0.17 0.032 ( 0.379) 0.010 0.022 33 2.75 0.17 0.032 ( 0.378) 0.010 0.022 34 2.83 0.17 0.032 ( 0.376) 0.010 0.022 35 2.92 0.17 0.032 ( 0.375) 0.010 0.022 36 3.00 0.17 0.032 ( 0.373) 0.010 0.022 37 3.08 0.17 0.032 ( 0.372) 0.010 0.022 38 3.17 0.17 0.032 ( 0.370) 0.010 0.022 39 3.25 0.17 0.032 ( 0.368) 0.010 0.022 40 3.33 0.17 0.032 ( 0.367) 0.010 0.022 41 3.42 0.17 0.032 ( 0.365) 0.010 0.022 42 3.50 0.17 0.032 ( 0.364) 0.010 0.022 43 3.58 0.17 0.032 ( 0.362) 0.010 0.022 44 3.67 0.17 0.032 ( 0.361) 0.010 0.022 45 3.75 0.17 0.032 ( 0.359) 0.010 0.022 46 3.83 0.20 0.038 ( 0.358) 0.012 0.026 47 3.92 0.20 0.038 ( 0.356) 0.012 0.026 48 4.00 0.20 0.038 ( 0.355) 0.012 0.026 49 4.08 0.20 0.038 ( 0.353) 0.012 0.026 50 4.17 0.20 0.038 ( 0.352) 0.012 0.026 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 51 4.25 0.20 0.038 ( 0.350) 0.012 0.026 52 4.33 0.23 0.045 ( 0.349) 0.014 0.030 53 4.42 0.23 0.045 ( 0.347) 0.014 0.030 54 4.50 0.23 0.045 ( 0.346) 0.014 0.030 55 4.58 0.23 0.045 ( 0.344) 0.014 0.030 56 4.67 0.23 0.045 ( 0.343) 0.014 0.030 57 4.75 0.23 0.045 ( 0.341) 0.014 0.030 58 4.83 0.27 0.051 ( 0.340) 0.016 0.035 59 4.92 0.27 0.051 ( 0.338) 0.016 0.035 60 5.00 0.27 0.051 ( 0.337) 0.016 0.035 61 5.08 0.20 0.038 ( 0.335) 0.012 0.026 62 5.17 0.20 0.038 ( 0.334) 0.012 0.026 63 5.25 0.20 0.038 ( 0.333) 0.012 0.026 64 5.33 0.23 0.045 ( 0.331) 0.014 0.030 65 5.42 0.23 0.045 ( 0.330) 0.014 0.030 66 5.50 0.23 0.045 ( 0.328) 0.014 0.030 67 5.58 0.27 0.051 ( 0.327) 0.016 0.035 68 5.67 0.27 0.051 ( 0.325) 0.016 0.035 69 5.75 0.27 0.051 ( 0.324) 0.016 0.035 70 5.83 0.27 0.051 ( 0.322) 0.016 0.035 71 5.92 0.27 0.051 ( 0.321) 0.016 0.035 72 6.00 0.27 0.051 ( 0.320) 0.016 0.035 73 6.08 0.30 0.058 ( 0.318) 0.018 0.039 74 6.17 0.30 0.058 ( 0.317) 0.018 0.039 75 6.25 0.30 0.058 ( 0.315) 0.018 0.039 76 6.33 0.30 0.058 ( 0.314) 0.018 0.039 77 6.42 0.30 0.058 ( 0.313) 0.018 0.039 78 6.50 0.30 0.058 ( 0.311) 0.018 0.039 79 6.58 0.33 0.064 ( 0.310) 0.020 0.044 80 6.67 0.33 0.064 ( 0.308) 0.020 0.044 81 6.75 0.33 0.064 ( 0.307) 0.020 0.044 82 6.83 0.33 0.064 ( 0.306) 0.020 0.044 83 6.92 0.33 0.064 ( 0.304) 0.020 0.044 84 7.00 0.33 0.064 ( 0.303) 0.020 0.044 85 7.08 0.33 0.064 ( 0.301) 0.020 0.044 86 7.17 0.33 0.064 ( 0.300) 0.020 0.044 87 7.25 0.33 0.064 ( 0.299) 0.020 0.044 88 7.33 0.37 0.070 ( 0.297) 0.023 0.048 89 7.42 0.37 0.070 ( 0.296) 0.023 0.048 90 7.50 0.37 0.070 ( 0.295) 0.023 0.048 91 7.58 0.40 0.077 ( 0.293) 0.025 0.052 92 7.67 0.40 0.077 ( 0.292) 0.025 0.052 93 7.75 0.40 0.077 ( 0.291) 0.025 0.052 94 7.83 0.43 0.083 ( 0.289) 0.027 0.057 95 7.92 0.43 0.083 ( 0.288) 0.027 0.057 96 8.00 0.43 0.083 ( 0.287) 0.027 0.057 97 8.08 0.50 0.096 ( 0.285) 0.031 0.065 98 8.17 0.50 0.096 ( 0.284) 0.031 0.065 99 8.25 0.50 0.096 ( 0.283) 0.031 0.065 100 8.33 0.50 0.096 ( 0.281) 0.031 0.065 101 8.42 0.50 0.096 ( 0.280) 0.031 0.065 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 102 8.50 0.50 0.096 ( 0.279) 0.031 0.065 103 8.58 0.53 0.102 ( 0.277) 0.033 0.070 104 8.67 0.53 0.102 ( 0.276) 0.033 0.070 105 8.75 0.53 0.102 ( 0.275) 0.033 0.070 106 8.83 0.57 0.109 ( 0.273) 0.035 0.074 107 8.92 0.57 0.109 ( 0.272) 0.035 0.074 108 9.00 0.57 0.109 ( 0.271) 0.035 0.074 109 9.08 0.63 0.122 ( 0.270) 0.039 0.083 110 9.17 0.63 0.122 ( 0.268) 0.039 0.083 111 9.25 0.63 0.122 ( 0.267) 0.039 0.083 112 9.33 0.67 0.128 ( 0.266) 0.041 0.087 113 9.42 0.67 0.128 ( 0.264) 0.041 0.087 114 9.50 0.67 0.128 ( 0.263) 0.041 0.087 115 9.58 0.70 0.134 ( 0.262) 0.043 0.091 116 9.67 0.70 0.134 ( 0.261) 0.043 0.091 117 9.75 0.70 0.134 ( 0.259) 0.043 0.091 118 9.83 0.73 0.141 ( 0.258) 0.045 0.096 119 9.92 0.73 0.141 ( 0.257) 0.045 0.096 120 10.00 0.73 0.141 ( 0.256) 0.045 0.096 121 10.08 0.50 0.096 ( 0.254) 0.031 0.065 122 10.17 0.50 0.096 ( 0.253) 0.031 0.065 123 10.25 0.50 0.096 ( 0.252) 0.031 0.065 124 10.33 0.50 0.096 ( 0.251) 0.031 0.065 125 10.42 0.50 0.096 ( 0.250) 0.031 0.065 126 10.50 0.50 0.096 ( 0.248) 0.031 0.065 127 10.58 0.67 0.128 ( 0.247) 0.041 0.087 128 10.67 0.67 0.128 ( 0.246) 0.041 0.087 129 10.75 0.67 0.128 ( 0.245) 0.041 0.087 130 10.83 0.67 0.128 ( 0.244) 0.041 0.087 131 10.92 0.67 0.128 ( 0.242) 0.041 0.087 132 11.00 0.67 0.128 ( 0.241) 0.041 0.087 133 11.08 0.63 0.122 ( 0.240) 0.039 0.083 134 11.17 0.63 0.122 ( 0.239) 0.039 0.083 135 11.25 0.63 0.122 ( 0.238) 0.039 0.083 136 11.33 0.63 0.122 ( 0.236) 0.039 0.083 137 11.42 0.63 0.122 ( 0.235) 0.039 0.083 138 11.50 0.63 0.122 ( 0.234) 0.039 0.083 139 11.58 0.57 0.109 ( 0.233) 0.035 0.074 140 11.67 0.57 0.109 ( 0.232) 0.035 0.074 141 11.75 0.57 0.109 ( 0.231) 0.035 0.074 142 11.83 0.60 0.115 ( 0.229) 0.037 0.078 143 11.92 0.60 0.115 ( 0.228) 0.037 0.078 144 12.00 0.60 0.115 ( 0.227) 0.037 0.078 145 12.08 0.83 0.160 ( 0.226) 0.051 0.109 146 12.17 0.83 0.160 ( 0.225) 0.051 0.109 147 12.25 0.83 0.160 ( 0.224) 0.051 0.109 148 12.33 0.87 0.166 ( 0.223) 0.053 0.113 149 12.42 0.87 0.166 ( 0.222) 0.053 0.113 150 12.50 0.87 0.166 ( 0.220) 0.053 0.113 151 12.58 0.93 0.179 ( 0.219) 0.057 0.122 152 12.67 0.93 0.179 ( 0.218) 0.057 0.122 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 153 12.75 0.93 0.179 ( 0.217) 0.057 0.122 154 12.83 0.97 0.186 ( 0.216) 0.059 0.126 155 12.92 0.97 0.186 ( 0.215) 0.059 0.126 156 13.00 0.97 0.186 ( 0.214) 0.059 0.126 157 13.08 1.13 0.218 ( 0.213) 0.070 0.148 158 13.17 1.13 0.218 ( 0.212) 0.070 0.148 159 13.25 1.13 0.218 ( 0.211) 0.070 0.148 160 13.33 1.13 0.218 ( 0.210) 0.070 0.148 161 13.42 1.13 0.218 ( 0.208) 0.070 0.148 162 13.50 1.13 0.218 ( 0.207) 0.070 0.148 163 13.58 0.77 0.147 ( 0.206) 0.047 0.100 164 13.67 0.77 0.147 ( 0.205) 0.047 0.100 165 13.75 0.77 0.147 ( 0.204) 0.047 0.100 166 13.83 0.77 0.147 ( 0.203) 0.047 0.100 167 13.92 0.77 0.147 ( 0.202) 0.047 0.100 168 14.00 0.77 0.147 ( 0.201) 0.047 0.100 169 14.08 0.90 0.173 ( 0.200) 0.055 0.118 170 14.17 0.90 0.173 ( 0.199) 0.055 0.118 171 14.25 0.90 0.173 ( 0.198) 0.055 0.118 172 14.33 0.87 0.166 ( 0.197) 0.053 0.113 173 14.42 0.87 0.166 ( 0.196) 0.053 0.113 174 14.50 0.87 0.166 ( 0.195) 0.053 0.113 175 14.58 0.87 0.166 ( 0.194) 0.053 0.113 176 14.67 0.87 0.166 ( 0.193) 0.053 0.113 177 14.75 0.87 0.166 ( 0.192) 0.053 0.113 178 14.83 0.83 0.160 ( 0.191) 0.051 0.109 179 14.92 0.83 0.160 ( 0.190) 0.051 0.109 180 15.00 0.83 0.160 ( 0.189) 0.051 0.109 181 15.08 0.80 0.154 ( 0.188) 0.049 0.104 182 15.17 0.80 0.154 ( 0.187) 0.049 0.104 183 15.25 0.80 0.154 ( 0.186) 0.049 0.104 184 15.33 0.77 0.147 ( 0.185) 0.047 0.100 185 15.42 0.77 0.147 ( 0.184) 0.047 0.100 186 15.50 0.77 0.147 ( 0.183) 0.047 0.100 187 15.58 0.63 0.122 ( 0.182) 0.039 0.083 188 15.67 0.63 0.122 ( 0.182) 0.039 0.083 189 15.75 0.63 0.122 ( 0.181) 0.039 0.083 190 15.83 0.63 0.122 ( 0.180) 0.039 0.083 191 15.92 0.63 0.122 ( 0.179) 0.039 0.083 192 16.00 0.63 0.122 ( 0.178) 0.039 0.083 193 16.08 0.13 0.026 ( 0.177) 0.008 0.017 194 16.17 0.13 0.026 ( 0.176) 0.008 0.017 195 16.25 0.13 0.026 ( 0.175) 0.008 0.017 196 16.33 0.13 0.026 ( 0.174) 0.008 0.017 197 16.42 0.13 0.026 ( 0.173) 0.008 0.017 198 16.50 0.13 0.026 ( 0.172) 0.008 0.017 199 16.58 0.10 0.019 ( 0.172) 0.006 0.013 200 16.67 0.10 0.019 ( 0.171) 0.006 0.013 201 16.75 0.10 0.019 ( 0.170) 0.006 0.013 202 16.83 0.10 0.019 ( 0.169) 0.006 0.013 203 16.92 0.10 0.019 ( 0.168) 0.006 0.013 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 204 17.00 0.10 0.019 ( 0.167) 0.006 0.013 205 17.08 0.17 0.032 ( 0.166) 0.010 0.022 206 17.17 0.17 0.032 ( 0.166) 0.010 0.022 207 17.25 0.17 0.032 ( 0.165) 0.010 0.022 208 17.33 0.17 0.032 ( 0.164) 0.010 0.022 209 17.42 0.17 0.032 ( 0.163) 0.010 0.022 210 17.50 0.17 0.032 ( 0.162) 0.010 0.022 211 17.58 0.17 0.032 ( 0.161) 0.010 0.022 212 17.67 0.17 0.032 ( 0.161) 0.010 0.022 213 17.75 0.17 0.032 ( 0.160) 0.010 0.022 214 17.83 0.13 0.026 ( 0.159) 0.008 0.017 215 17.92 0.13 0.026 ( 0.158) 0.008 0.017 216 18.00 0.13 0.026 ( 0.158) 0.008 0.017 217 18.08 0.13 0.026 ( 0.157) 0.008 0.017 218 18.17 0.13 0.026 ( 0.156) 0.008 0.017 219 18.25 0.13 0.026 ( 0.155) 0.008 0.017 220 18.33 0.13 0.026 ( 0.154) 0.008 0.017 221 18.42 0.13 0.026 ( 0.154) 0.008 0.017 222 18.50 0.13 0.026 ( 0.153) 0.008 0.017 223 18.58 0.10 0.019 ( 0.152) 0.006 0.013 224 18.67 0.10 0.019 ( 0.151) 0.006 0.013 225 18.75 0.10 0.019 ( 0.151) 0.006 0.013 226 18.83 0.07 0.013 ( 0.150) 0.004 0.009 227 18.92 0.07 0.013 ( 0.149) 0.004 0.009 228 19.00 0.07 0.013 ( 0.149) 0.004 0.009 229 19.08 0.10 0.019 ( 0.148) 0.006 0.013 230 19.17 0.10 0.019 ( 0.147) 0.006 0.013 231 19.25 0.10 0.019 ( 0.147) 0.006 0.013 232 19.33 0.13 0.026 ( 0.146) 0.008 0.017 233 19.42 0.13 0.026 ( 0.145) 0.008 0.017 234 19.50 0.13 0.026 ( 0.144) 0.008 0.017 235 19.58 0.10 0.019 ( 0.144) 0.006 0.013 236 19.67 0.10 0.019 ( 0.143) 0.006 0.013 237 19.75 0.10 0.019 ( 0.143) 0.006 0.013 238 19.83 0.07 0.013 ( 0.142) 0.004 0.009 239 19.92 0.07 0.013 ( 0.141) 0.004 0.009 240 20.00 0.07 0.013 ( 0.141) 0.004 0.009 241 20.08 0.10 0.019 ( 0.140) 0.006 0.013 242 20.17 0.10 0.019 ( 0.139) 0.006 0.013 243 20.25 0.10 0.019 ( 0.139) 0.006 0.013 244 20.33 0.10 0.019 ( 0.138) 0.006 0.013 245 20.42 0.10 0.019 ( 0.138) 0.006 0.013 246 20.50 0.10 0.019 ( 0.137) 0.006 0.013 247 20.58 0.10 0.019 ( 0.136) 0.006 0.013 248 20.67 0.10 0.019 ( 0.136) 0.006 0.013 249 20.75 0.10 0.019 ( 0.135) 0.006 0.013 250 20.83 0.07 0.013 ( 0.135) 0.004 0.009 251 20.92 0.07 0.013 ( 0.134) 0.004 0.009 252 21.00 0.07 0.013 ( 0.134) 0.004 0.009 253 21.08 0.10 0.019 ( 0.133) 0.006 0.013 254 21.17 0.10 0.019 ( 0.133) 0.006 0.013 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 255 21.25 0.10 0.019 ( 0.132) 0.006 0.013 256 21.33 0.07 0.013 ( 0.132) 0.004 0.009 257 21.42 0.07 0.013 ( 0.131) 0.004 0.009 258 21.50 0.07 0.013 ( 0.131) 0.004 0.009 259 21.58 0.10 0.019 ( 0.130) 0.006 0.013 260 21.67 0.10 0.019 ( 0.130) 0.006 0.013 261 21.75 0.10 0.019 ( 0.129) 0.006 0.013 262 21.83 0.07 0.013 ( 0.129) 0.004 0.009 263 21.92 0.07 0.013 ( 0.128) 0.004 0.009 264 22.00 0.07 0.013 ( 0.128) 0.004 0.009 265 22.08 0.10 0.019 ( 0.127) 0.006 0.013 266 22.17 0.10 0.019 ( 0.127) 0.006 0.013 267 22.25 0.10 0.019 ( 0.127) 0.006 0.013 268 22.33 0.07 0.013 ( 0.126) 0.004 0.009 269 22.42 0.07 0.013 ( 0.126) 0.004 0.009 270 22.50 0.07 0.013 ( 0.125) 0.004 0.009 271 22.58 0.07 0.013 ( 0.125) 0.004 0.009 272 22.67 0.07 0.013 ( 0.125) 0.004 0.009 273 22.75 0.07 0.013 ( 0.124) 0.004 0.009 274 22.83 0.07 0.013 ( 0.124) 0.004 0.009 275 22.92 0.07 0.013 ( 0.124) 0.004 0.009 276 23.00 0.07 0.013 ( 0.123) 0.004 0.009 277 23.08 0.07 0.013 ( 0.123) 0.004 0.009 278 23.17 0.07 0.013 ( 0.123) 0.004 0.009 279 23.25 0.07 0.013 ( 0.123) 0.004 0.009 280 23.33 0.07 0.013 ( 0.122) 0.004 0.009 281 23.42 0.07 0.013 ( 0.122) 0.004 0.009 282 23.50 0.07 0.013 ( 0.122) 0.004 0.009 283 23.58 0.07 0.013 ( 0.122) 0.004 0.009 284 23.67 0.07 0.013 ( 0.122) 0.004 0.009 285 23.75 0.07 0.013 ( 0.121) 0.004 0.009 286 23.83 0.07 0.013 ( 0.121) 0.004 0.009 287 23.92 0.07 0.013 ( 0.121) 0.004 0.009 288 24.00 0.07 0.013 ( 0.121) 0.004 0.009 (Loss Rate Not Used)
Sum = 100.0 Sum = 13.1 Flood volume = Effective rainfall 1.09(In)
times area 1.9(Ac.)/[(In)/(Ft.)] = 0.2(Ac.Ft) Total soil loss = 0.51(In)
Total soil loss = 0.081(Ac.Ft)
Total rainfall = 1.60(In)
Flood volume = 7543.4 Cubic Feet
Total soil loss = 3549.8 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 0.284(CFS)
-------------------------------------------------------------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 24 - 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
-------------------------------------------------------------------- Hydrograph in 5 Minute intervals ((CFS))
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices -------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 2.5 5.0 7.5 10.0 ----------------------------------------------------------------------- 0+ 5 0.0000 0.00 Q | | | | 0+10 0.0001 0.01 Q | | | | 0+15 0.0002 0.01 Q | | | | 0+20 0.0003 0.02 Q | | | | 0+25 0.0004 0.02 Q | | | | 0+30 0.0006 0.02 Q | | | | 0+35 0.0008 0.02 Q | | | | 0+40 0.0010 0.02 Q | | | | 0+45 0.0011 0.03 Q | | | | 0+50 0.0013 0.03 Q | | | | 0+55 0.0015 0.03 Q | | | | 1+ 0 0.0017 0.03 Q | | | | 1+ 5 0.0020 0.03 Q | | | | 1+10 0.0021 0.03 Q | | | | 1+15 0.0023 0.03 Q | | | | 1+20 0.0025 0.03 Q | | | | 1+25 0.0027 0.03 Q | | | | 1+30 0.0029 0.03 Q | | | | 1+35 0.0030 0.03 Q | | | | 1+40 0.0032 0.03 Q | | | | 1+45 0.0034 0.03 Q | | | | 1+50 0.0036 0.03 Q | | | | 1+55 0.0038 0.03 Q | | | | 2+ 0 0.0040 0.03 Q | | | | 2+ 5 0.0042 0.03 Q | | | | 2+10 0.0044 0.03 QV | | | | 2+15 0.0047 0.03 QV | | | | 2+20 0.0049 0.03 QV | | | | 2+25 0.0051 0.03 QV | | | | 2+30 0.0054 0.03 QV | | | | 2+35 0.0056 0.03 QV | | | | 2+40 0.0059 0.04 QV | | | | 2+45 0.0061 0.04 QV | | | | 2+50 0.0064 0.04 QV | | | | 2+55 0.0067 0.04 QV | | | | 3+ 0 0.0070 0.04 QV | | | | 3+ 5 0.0073 0.04 QV | | | | 3+10 0.0076 0.04 QV | | | | 3+15 0.0079 0.04 QV | | | | 3+20 0.0082 0.04 QV | | | | 3+25 0.0085 0.04 QV | | | | 3+30 0.0087 0.04 Q V | | | | 3+35 0.0090 0.04 Q V | | | | 3+40 0.0093 0.04 Q V | | | | 3+45 0.0096 0.04 Q V | | | | 3+50 0.0099 0.04 Q V | | | | 3+55 0.0102 0.05 Q V | | | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 4+ 0 0.0106 0.05 Q V | | | | 4+ 5 0.0109 0.05 Q V | | | | 4+10 0.0113 0.05 Q V | | | | 4+15 0.0116 0.05 Q V | | | | 4+20 0.0119 0.05 Q V | | | | 4+25 0.0123 0.06 Q V | | | | 4+30 0.0127 0.06 Q V | | | | 4+35 0.0131 0.06 Q V | | | | 4+40 0.0135 0.06 Q V | | | | 4+45 0.0139 0.06 Q V | | | | 4+50 0.0143 0.06 Q V | | | | 4+55 0.0148 0.06 Q V | | | | 5+ 0 0.0152 0.07 Q V | | | | 5+ 5 0.0157 0.06 Q V | | | | 5+10 0.0161 0.06 Q V | | | | 5+15 0.0164 0.05 Q V | | | | 5+20 0.0168 0.05 Q V | | | | 5+25 0.0172 0.06 Q V | | | | 5+30 0.0176 0.06 Q V | | | | 5+35 0.0180 0.06 Q V | | | | 5+40 0.0184 0.06 Q V | | | | 5+45 0.0189 0.07 Q V | | | | 5+50 0.0193 0.07 Q V | | | | 5+55 0.0198 0.07 Q V | | | | 6+ 0 0.0203 0.07 Q V | | | | 6+ 5 0.0207 0.07 Q V | | | | 6+10 0.0212 0.07 Q V | | | | 6+15 0.0217 0.07 Q V | | | | 6+20 0.0222 0.07 Q V | | | | 6+25 0.0228 0.08 Q V | | | | 6+30 0.0233 0.08 Q V | | | | 6+35 0.0238 0.08 Q V | | | | 6+40 0.0244 0.08 Q V | | | | 6+45 0.0249 0.08 Q V | | | | 6+50 0.0255 0.08 Q V | | | | 6+55 0.0261 0.08 Q V | | | | 7+ 0 0.0267 0.08 Q V | | | | 7+ 5 0.0272 0.08 Q V | | | | 7+10 0.0278 0.08 Q V | | | | 7+15 0.0284 0.08 Q V | | | | 7+20 0.0290 0.08 Q V | | | | 7+25 0.0296 0.09 Q V | | | | 7+30 0.0302 0.09 Q V | | | | 7+35 0.0309 0.09 Q V | | | | 7+40 0.0315 0.10 Q V | | | | 7+45 0.0322 0.10 Q V | | | | 7+50 0.0329 0.10 Q V | | | | 7+55 0.0336 0.11 Q V | | | | 8+ 0 0.0344 0.11 Q V | | | | 8+ 5 0.0351 0.11 Q V | | | | 8+10 0.0359 0.12 Q V | | | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 8+15 0.0368 0.12 Q V | | | | 8+20 0.0377 0.12 Q V | | | | 8+25 0.0385 0.13 Q V | | | | 8+30 0.0394 0.13 Q V| | | | 8+35 0.0403 0.13 Q V| | | | 8+40 0.0412 0.13 Q V| | | | 8+45 0.0421 0.13 Q V| | | | 8+50 0.0430 0.13 Q V| | | | 8+55 0.0440 0.14 Q V | | | 9+ 0 0.0449 0.14 Q V | | | 9+ 5 0.0459 0.14 Q V | | | 9+10 0.0470 0.15 Q V | | | 9+15 0.0480 0.16 Q |V | | | 9+20 0.0491 0.16 Q |V | | | 9+25 0.0503 0.16 Q |V | | | 9+30 0.0514 0.17 Q |V | | | 9+35 0.0526 0.17 Q | V | | | 9+40 0.0538 0.17 Q | V | | | 9+45 0.0550 0.17 Q | V | | | 9+50 0.0562 0.18 Q | V | | | 9+55 0.0574 0.18 Q | V | | | 10+ 0 0.0587 0.18 Q | V | | | 10+ 5 0.0599 0.18 Q | V | | | 10+10 0.0609 0.15 Q | V | | | 10+15 0.0619 0.13 Q | V | | | 10+20 0.0627 0.13 Q | V | | | 10+25 0.0636 0.13 Q | V | | | 10+30 0.0645 0.13 Q | V | | | 10+35 0.0654 0.13 Q | V | | | 10+40 0.0664 0.15 Q | V | | | 10+45 0.0675 0.16 Q | V | | | 10+50 0.0687 0.16 Q | V | | | 10+55 0.0698 0.17 Q | V | | | 11+ 0 0.0710 0.17 Q | V | | | 11+ 5 0.0721 0.17 Q | V | | | 11+10 0.0732 0.16 Q | V | | | 11+15 0.0744 0.16 Q | V | | | 11+20 0.0755 0.16 Q | V | | | 11+25 0.0766 0.16 Q | V | | | 11+30 0.0776 0.16 Q | V | | | 11+35 0.0787 0.16 Q | V | | | 11+40 0.0798 0.15 Q | V | | | 11+45 0.0808 0.15 Q | V | | | 11+50 0.0818 0.14 Q | V | | | 11+55 0.0828 0.15 Q | V| | | 12+ 0 0.0838 0.15 Q | V| | | 12+ 5 0.0849 0.16 Q | V| | | 12+10 0.0862 0.19 Q | V| | | 12+15 0.0876 0.20 Q | V | | 12+20 0.0890 0.21 Q | V | | 12+25 0.0904 0.21 Q | V | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 12+30 0.0919 0.22 Q | |V | | 12+35 0.0934 0.22 Q | |V | | 12+40 0.0950 0.23 Q | |V | | 12+45 0.0966 0.23 Q | | V | | 12+50 0.0982 0.23 Q | | V | | 12+55 0.0999 0.24 Q | | V | | 13+ 0 0.1015 0.24 Q | | V | | 13+ 5 0.1032 0.25 Q | | V | | 13+10 0.1051 0.27 |Q | | V | | 13+15 0.1070 0.28 |Q | | V | | 13+20 0.1090 0.28 |Q | | V | | 13+25 0.1109 0.28 |Q | | V | | 13+30 0.1129 0.28 |Q | | V | | 13+35 0.1148 0.27 |Q | | V | | 13+40 0.1163 0.23 Q | | V | | 13+45 0.1178 0.21 Q | | V | | 13+50 0.1191 0.20 Q | | V | | 13+55 0.1205 0.20 Q | | V | | 14+ 0 0.1218 0.19 Q | | V | | 14+ 5 0.1232 0.20 Q | | V | | 14+10 0.1246 0.21 Q | | V | | 14+15 0.1262 0.22 Q | | V| | 14+20 0.1277 0.22 Q | | V| | 14+25 0.1292 0.22 Q | | V| | 14+30 0.1307 0.22 Q | | V | 14+35 0.1322 0.22 Q | | V | 14+40 0.1337 0.22 Q | | V | 14+45 0.1352 0.22 Q | | |V | 14+50 0.1367 0.22 Q | | |V | 14+55 0.1382 0.21 Q | | |V | 15+ 0 0.1396 0.21 Q | | | V | 15+ 5 0.1411 0.21 Q | | | V | 15+10 0.1425 0.20 Q | | | V | 15+15 0.1439 0.20 Q | | | V | 15+20 0.1453 0.20 Q | | | V | 15+25 0.1466 0.20 Q | | | V | 15+30 0.1479 0.19 Q | | | V | 15+35 0.1493 0.19 Q | | | V | 15+40 0.1504 0.17 Q | | | V | 15+45 0.1516 0.16 Q | | | V | 15+50 0.1527 0.16 Q | | | V | 15+55 0.1538 0.16 Q | | | V | 16+ 0 0.1549 0.16 Q | | | V | 16+ 5 0.1559 0.15 Q | | | V | 16+10 0.1564 0.08 Q | | | V | 16+15 0.1568 0.05 Q | | | V | 16+20 0.1571 0.04 Q | | | V | 16+25 0.1573 0.04 Q | | | V | 16+30 0.1576 0.04 Q | | | V | 16+35 0.1578 0.03 Q | | | V | 16+40 0.1580 0.03 Q | | | V | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 16+45 0.1582 0.03 Q | | | V | 16+50 0.1584 0.03 Q | | | V | 16+55 0.1585 0.03 Q | | | V | 17+ 0 0.1587 0.03 Q | | | V | 17+ 5 0.1589 0.03 Q | | | V | 17+10 0.1591 0.04 Q | | | V | 17+15 0.1594 0.04 Q | | | V | 17+20 0.1597 0.04 Q | | | V | 17+25 0.1600 0.04 Q | | | V | 17+30 0.1603 0.04 Q | | | V | 17+35 0.1606 0.04 Q | | | V | 17+40 0.1608 0.04 Q | | | V | 17+45 0.1611 0.04 Q | | | V | 17+50 0.1614 0.04 Q | | | V | 17+55 0.1617 0.04 Q | | | V | 18+ 0 0.1619 0.03 Q | | | V | 18+ 5 0.1621 0.03 Q | | | V | 18+10 0.1624 0.03 Q | | | V | 18+15 0.1626 0.03 Q | | | V | 18+20 0.1628 0.03 Q | | | V | 18+25 0.1631 0.03 Q | | | V | 18+30 0.1633 0.03 Q | | | V | 18+35 0.1635 0.03 Q | | | V | 18+40 0.1637 0.03 Q | | | V | 18+45 0.1639 0.03 Q | | | V | 18+50 0.1641 0.02 Q | | | V | 18+55 0.1642 0.02 Q | | | V | 19+ 0 0.1643 0.02 Q | | | V | 19+ 5 0.1645 0.02 Q | | | V | 19+10 0.1646 0.02 Q | | | V | 19+15 0.1648 0.02 Q | | | V | 19+20 0.1650 0.03 Q | | | V | 19+25 0.1652 0.03 Q | | | V | 19+30 0.1654 0.03 Q | | | V | 19+35 0.1656 0.03 Q | | | V | 19+40 0.1658 0.03 Q | | | V | 19+45 0.1660 0.03 Q | | | V | 19+50 0.1661 0.02 Q | | | V | 19+55 0.1663 0.02 Q | | | V | 20+ 0 0.1664 0.02 Q | | | V | 20+ 5 0.1665 0.02 Q | | | V | 20+10 0.1667 0.02 Q | | | V | 20+15 0.1669 0.02 Q | | | V | 20+20 0.1670 0.02 Q | | | V | 20+25 0.1672 0.02 Q | | | V | 20+30 0.1674 0.03 Q | | | V | 20+35 0.1675 0.03 Q | | | V | 20+40 0.1677 0.03 Q | | | V | 20+45 0.1679 0.03 Q | | | V | 20+50 0.1681 0.02 Q | | | V | 20+55 0.1682 0.02 Q | | | V | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 21+ 0 0.1683 0.02 Q | | | V | 21+ 5 0.1684 0.02 Q | | | V | 21+10 0.1686 0.02 Q | | | V | 21+15 0.1688 0.02 Q | | | V | 21+20 0.1689 0.02 Q | | | V| 21+25 0.1691 0.02 Q | | | V| 21+30 0.1692 0.02 Q | | | V| 21+35 0.1693 0.02 Q | | | V| 21+40 0.1695 0.02 Q | | | V| 21+45 0.1696 0.02 Q | | | V| 21+50 0.1698 0.02 Q | | | V| 21+55 0.1699 0.02 Q | | | V| 22+ 0 0.1700 0.02 Q | | | V| 22+ 5 0.1702 0.02 Q | | | V| 22+10 0.1703 0.02 Q | | | V| 22+15 0.1705 0.02 Q | | | V| 22+20 0.1707 0.02 Q | | | V| 22+25 0.1708 0.02 Q | | | V| 22+30 0.1709 0.02 Q | | | V| 22+35 0.1710 0.02 Q | | | V| 22+40 0.1711 0.02 Q | | | V| 22+45 0.1713 0.02 Q | | | V| 22+50 0.1714 0.02 Q | | | V| 22+55 0.1715 0.02 Q | | | V| 23+ 0 0.1716 0.02 Q | | | V| 23+ 5 0.1717 0.02 Q | | | V| 23+10 0.1718 0.02 Q | | | V| 23+15 0.1720 0.02 Q | | | V| 23+20 0.1721 0.02 Q | | | V| 23+25 0.1722 0.02 Q | | | V| 23+30 0.1723 0.02 Q | | | V| 23+35 0.1724 0.02 Q | | | V| 23+40 0.1725 0.02 Q | | | V| 23+45 0.1727 0.02 Q | | | V| 23+50 0.1728 0.02 Q | | | V| 23+55 0.1729 0.02 Q | | | V| 24+ 0 0.1730 0.02 Q | | | V| 24+ 5 0.1731 0.01 Q | | | V| 24+10 0.1731 0.01 Q | | | V| 24+15 0.1732 0.00 Q | | | V| 24+20 0.1732 0.00 Q | | | V| 24+25 0.1732 0.00 Q | | | V| 24+30 0.1732 0.00 Q | | | V| 24+35 0.1732 0.00 Q | | | V| ----------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 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 - 2018, Version 9.0 Study date 10/07/24 File: rchph1a15.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6443
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- RCH Garage
DMA A
Kimley-Horn
5 yr
-------------------------------------------------------------------- Drainage Area = 1.91(Ac.) = 0.003 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 1.91(Ac.) =

0.003 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.095 Hr.

Lag time = 5.70 Min.
25% of lag time = 1.43 Min.
40% of lag time = 2.28 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]

1.91 0.50 0.95
100 YEAR Area rainfall data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.91 1.10 2.10
STORM EVENT (YEAR) = 5.00
Area Averaged 2-Year Rainfall = 0.500(In)
Area Averaged 100-Year Rainfall = 1.100(In)
Point rain (area averaged) = 0.641(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 0.641(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

1.910 56.00 0.730
Total Area Entered = 1.91(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

Drainage Area for Depth-Area Areal Adjustment = 1.91(Ac.) =

0.003 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.095 Hr.

Lag time = 5.70 Min.
25% of lag time = 1.43 Min.
40% of lag time = 2.28 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]

1.91 0.80 1.53
100 YEAR Area rainfall data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.91 1.80 3.44
STORM EVENT (YEAR) = 5.00
Area Averaged 2-Year Rainfall = 0.800(In)
Area Averaged 100-Year Rainfall = 1.800(In)
Point rain (area averaged) = 1.034(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 1.034(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

1.910 56.00 0.730
Total Area Entered = 1.91(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

Drainage Area for Depth-Area Areal Adjustment = 1.91(Ac.) =

0.003 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.095 Hr.

Lag time = 5.70 Min.
25% of lag time = 1.43 Min.
40% of lag time = 2.28 Min.

Unit time = 5.00 Min.

Duration of storm = 6 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.91 1.00 1.91
100 YEAR Area rainfall data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.91 2.50 4.77
STORM EVENT (YEAR) = 5.00
Area Averaged 2-Year Rainfall = 1.000(In)
Area Averaged 100-Year Rainfall = 2.500(In)
Point rain (area averaged) = 1.351(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 1.351(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

1.910 56.00 0.730
Total Area Entered = 1.91(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

Drainage Area for Depth-Area Areal Adjustment = 1.91(Ac.) =

0.003 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.095 Hr.

Lag time = 5.70 Min.
25% of lag time = 1.43 Min.
40% of lag time = 2.28 Min.

Unit time = 5.00 Min.

Duration of storm = 24 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.91 1.60 3.06
100 YEAR Area rainfall data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.91 4.00 7.64
STORM EVENT (YEAR) = 5.00
Area Averaged 2-Year Rainfall = 1.600(In)
Area Averaged 100-Year Rainfall = 4.000(In)
Point rain (area averaged) = 2.162(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 2.162(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

1.910 56.00 0.730
Total Area Entered = 1.91(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

56.0 36.0 0.706 0.730 0.242 1.000 0.242 Sum (F) = 0.242
Area averaged mean soil loss (F) (In/Hr) = 0.242
Minimum soil loss rate ((In/Hr)) = 0.121
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.320
--------------------------------------------------------------------- U n i t H y d r o g r a p h
FOOTHILL S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 87.719 10.710 0.206 2 0.167 175.439 52.537 1.011 3 0.250 263.158 21.572 0.415 4 0.333 350.877 8.833 0.170 5 0.417 438.596 3.926 0.076 6 0.500 526.316 1.230 0.024 7 0.583 614.035 0.656 0.013 8 0.667 701.754 0.537 0.010 Sum = 100.000 Sum= 1.925
----------------------------------------------------------------------- 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 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices (Hr.) Percent (In/Hr) Max | Low (In/Hr) 1 0.08 0.07 0.017 ( 0.429) 0.006 0.012 2 0.17 0.07 0.017 ( 0.428) 0.006 0.012 3 0.25 0.07 0.017 ( 0.426) 0.006 0.012 4 0.33 0.10 0.026 ( 0.424) 0.008 0.018 5 0.42 0.10 0.026 ( 0.423) 0.008 0.018 6 0.50 0.10 0.026 ( 0.421) 0.008 0.018 7 0.58 0.10 0.026 ( 0.419) 0.008 0.018 8 0.67 0.10 0.026 ( 0.418) 0.008 0.018 9 0.75 0.10 0.026 ( 0.416) 0.008 0.018 10 0.83 0.13 0.035 ( 0.414) 0.011 0.024 11 0.92 0.13 0.035 ( 0.413) 0.011 0.024 12 1.00 0.13 0.035 ( 0.411) 0.011 0.024 13 1.08 0.10 0.026 ( 0.410) 0.008 0.018 14 1.17 0.10 0.026 ( 0.408) 0.008 0.018 15 1.25 0.10 0.026 ( 0.406) 0.008 0.018 16 1.33 0.10 0.026 ( 0.405) 0.008 0.018 17 1.42 0.10 0.026 ( 0.403) 0.008 0.018 18 1.50 0.10 0.026 ( 0.401) 0.008 0.018 19 1.58 0.10 0.026 ( 0.400) 0.008 0.018 20 1.67 0.10 0.026 ( 0.398) 0.008 0.018 21 1.75 0.10 0.026 ( 0.397) 0.008 0.018 22 1.83 0.13 0.035 ( 0.395) 0.011 0.024 23 1.92 0.13 0.035 ( 0.394) 0.011 0.024 24 2.00 0.13 0.035 ( 0.392) 0.011 0.024 25 2.08 0.13 0.035 ( 0.390) 0.011 0.024 26 2.17 0.13 0.035 ( 0.389) 0.011 0.024 27 2.25 0.13 0.035 ( 0.387) 0.011 0.024 28 2.33 0.13 0.035 ( 0.386) 0.011 0.024 29 2.42 0.13 0.035 ( 0.384) 0.011 0.024 30 2.50 0.13 0.035 ( 0.382) 0.011 0.024 31 2.58 0.17 0.043 ( 0.381) 0.014 0.029 32 2.67 0.17 0.043 ( 0.379) 0.014 0.029 33 2.75 0.17 0.043 ( 0.378) 0.014 0.029 34 2.83 0.17 0.043 ( 0.376) 0.014 0.029 35 2.92 0.17 0.043 ( 0.375) 0.014 0.029 36 3.00 0.17 0.043 ( 0.373) 0.014 0.029 37 3.08 0.17 0.043 ( 0.372) 0.014 0.029 38 3.17 0.17 0.043 ( 0.370) 0.014 0.029 39 3.25 0.17 0.043 ( 0.368) 0.014 0.029 40 3.33 0.17 0.043 ( 0.367) 0.014 0.029 41 3.42 0.17 0.043 ( 0.365) 0.014 0.029 42 3.50 0.17 0.043 ( 0.364) 0.014 0.029 43 3.58 0.17 0.043 ( 0.362) 0.014 0.029 44 3.67 0.17 0.043 ( 0.361) 0.014 0.029 45 3.75 0.17 0.043 ( 0.359) 0.014 0.029 46 3.83 0.20 0.052 ( 0.358) 0.017 0.035 47 3.92 0.20 0.052 ( 0.356) 0.017 0.035 48 4.00 0.20 0.052 ( 0.355) 0.017 0.035 49 4.08 0.20 0.052 ( 0.353) 0.017 0.035 50 4.17 0.20 0.052 ( 0.352) 0.017 0.035 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 51 4.25 0.20 0.052 ( 0.350) 0.017 0.035 52 4.33 0.23 0.061 ( 0.349) 0.019 0.041 53 4.42 0.23 0.061 ( 0.347) 0.019 0.041 54 4.50 0.23 0.061 ( 0.346) 0.019 0.041 55 4.58 0.23 0.061 ( 0.344) 0.019 0.041 56 4.67 0.23 0.061 ( 0.343) 0.019 0.041 57 4.75 0.23 0.061 ( 0.341) 0.019 0.041 58 4.83 0.27 0.069 ( 0.340) 0.022 0.047 59 4.92 0.27 0.069 ( 0.338) 0.022 0.047 60 5.00 0.27 0.069 ( 0.337) 0.022 0.047 61 5.08 0.20 0.052 ( 0.335) 0.017 0.035 62 5.17 0.20 0.052 ( 0.334) 0.017 0.035 63 5.25 0.20 0.052 ( 0.333) 0.017 0.035 64 5.33 0.23 0.061 ( 0.331) 0.019 0.041 65 5.42 0.23 0.061 ( 0.330) 0.019 0.041 66 5.50 0.23 0.061 ( 0.328) 0.019 0.041 67 5.58 0.27 0.069 ( 0.327) 0.022 0.047 68 5.67 0.27 0.069 ( 0.325) 0.022 0.047 69 5.75 0.27 0.069 ( 0.324) 0.022 0.047 70 5.83 0.27 0.069 ( 0.322) 0.022 0.047 71 5.92 0.27 0.069 ( 0.321) 0.022 0.047 72 6.00 0.27 0.069 ( 0.320) 0.022 0.047 73 6.08 0.30 0.078 ( 0.318) 0.025 0.053 74 6.17 0.30 0.078 ( 0.317) 0.025 0.053 75 6.25 0.30 0.078 ( 0.315) 0.025 0.053 76 6.33 0.30 0.078 ( 0.314) 0.025 0.053 77 6.42 0.30 0.078 ( 0.313) 0.025 0.053 78 6.50 0.30 0.078 ( 0.311) 0.025 0.053 79 6.58 0.33 0.086 ( 0.310) 0.028 0.059 80 6.67 0.33 0.086 ( 0.308) 0.028 0.059 81 6.75 0.33 0.086 ( 0.307) 0.028 0.059 82 6.83 0.33 0.086 ( 0.306) 0.028 0.059 83 6.92 0.33 0.086 ( 0.304) 0.028 0.059 84 7.00 0.33 0.086 ( 0.303) 0.028 0.059 85 7.08 0.33 0.086 ( 0.301) 0.028 0.059 86 7.17 0.33 0.086 ( 0.300) 0.028 0.059 87 7.25 0.33 0.086 ( 0.299) 0.028 0.059 88 7.33 0.37 0.095 ( 0.297) 0.030 0.065 89 7.42 0.37 0.095 ( 0.296) 0.030 0.065 90 7.50 0.37 0.095 ( 0.295) 0.030 0.065 91 7.58 0.40 0.104 ( 0.293) 0.033 0.071 92 7.67 0.40 0.104 ( 0.292) 0.033 0.071 93 7.75 0.40 0.104 ( 0.291) 0.033 0.071 94 7.83 0.43 0.112 ( 0.289) 0.036 0.076 95 7.92 0.43 0.112 ( 0.288) 0.036 0.076 96 8.00 0.43 0.112 ( 0.287) 0.036 0.076 97 8.08 0.50 0.130 ( 0.285) 0.042 0.088 98 8.17 0.50 0.130 ( 0.284) 0.042 0.088 99 8.25 0.50 0.130 ( 0.283) 0.042 0.088 100 8.33 0.50 0.130 ( 0.281) 0.042 0.088 101 8.42 0.50 0.130 ( 0.280) 0.042 0.088 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 102 8.50 0.50 0.130 ( 0.279) 0.042 0.088 103 8.58 0.53 0.138 ( 0.277) 0.044 0.094 104 8.67 0.53 0.138 ( 0.276) 0.044 0.094 105 8.75 0.53 0.138 ( 0.275) 0.044 0.094 106 8.83 0.57 0.147 ( 0.273) 0.047 0.100 107 8.92 0.57 0.147 ( 0.272) 0.047 0.100 108 9.00 0.57 0.147 ( 0.271) 0.047 0.100 109 9.08 0.63 0.164 ( 0.270) 0.053 0.112 110 9.17 0.63 0.164 ( 0.268) 0.053 0.112 111 9.25 0.63 0.164 ( 0.267) 0.053 0.112 112 9.33 0.67 0.173 ( 0.266) 0.055 0.118 113 9.42 0.67 0.173 ( 0.264) 0.055 0.118 114 9.50 0.67 0.173 ( 0.263) 0.055 0.118 115 9.58 0.70 0.182 ( 0.262) 0.058 0.124 116 9.67 0.70 0.182 ( 0.261) 0.058 0.124 117 9.75 0.70 0.182 ( 0.259) 0.058 0.124 118 9.83 0.73 0.190 ( 0.258) 0.061 0.129 119 9.92 0.73 0.190 ( 0.257) 0.061 0.129 120 10.00 0.73 0.190 ( 0.256) 0.061 0.129 121 10.08 0.50 0.130 ( 0.254) 0.042 0.088 122 10.17 0.50 0.130 ( 0.253) 0.042 0.088 123 10.25 0.50 0.130 ( 0.252) 0.042 0.088 124 10.33 0.50 0.130 ( 0.251) 0.042 0.088 125 10.42 0.50 0.130 ( 0.250) 0.042 0.088 126 10.50 0.50 0.130 ( 0.248) 0.042 0.088 127 10.58 0.67 0.173 ( 0.247) 0.055 0.118 128 10.67 0.67 0.173 ( 0.246) 0.055 0.118 129 10.75 0.67 0.173 ( 0.245) 0.055 0.118 130 10.83 0.67 0.173 ( 0.244) 0.055 0.118 131 10.92 0.67 0.173 ( 0.242) 0.055 0.118 132 11.00 0.67 0.173 ( 0.241) 0.055 0.118 133 11.08 0.63 0.164 ( 0.240) 0.053 0.112 134 11.17 0.63 0.164 ( 0.239) 0.053 0.112 135 11.25 0.63 0.164 ( 0.238) 0.053 0.112 136 11.33 0.63 0.164 ( 0.236) 0.053 0.112 137 11.42 0.63 0.164 ( 0.235) 0.053 0.112 138 11.50 0.63 0.164 ( 0.234) 0.053 0.112 139 11.58 0.57 0.147 ( 0.233) 0.047 0.100 140 11.67 0.57 0.147 ( 0.232) 0.047 0.100 141 11.75 0.57 0.147 ( 0.231) 0.047 0.100 142 11.83 0.60 0.156 ( 0.229) 0.050 0.106 143 11.92 0.60 0.156 ( 0.228) 0.050 0.106 144 12.00 0.60 0.156 ( 0.227) 0.050 0.106 145 12.08 0.83 0.216 ( 0.226) 0.069 0.147 146 12.17 0.83 0.216 ( 0.225) 0.069 0.147 147 12.25 0.83 0.216 ( 0.224) 0.069 0.147 148 12.33 0.87 0.225 ( 0.223) 0.072 0.153 149 12.42 0.87 0.225 ( 0.222) 0.072 0.153 150 12.50 0.87 0.225 ( 0.220) 0.072 0.153 151 12.58 0.93 0.242 ( 0.219) 0.077 0.165 152 12.67 0.93 0.242 ( 0.218) 0.077 0.165 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 153 12.75 0.93 0.242 ( 0.217) 0.077 0.165 154 12.83 0.97 0.251 ( 0.216) 0.080 0.171 155 12.92 0.97 0.251 ( 0.215) 0.080 0.171 156 13.00 0.97 0.251 ( 0.214) 0.080 0.171 157 13.08 1.13 0.294 ( 0.213) 0.094 0.200 158 13.17 1.13 0.294 ( 0.212) 0.094 0.200 159 13.25 1.13 0.294 ( 0.211) 0.094 0.200 160 13.33 1.13 0.294 ( 0.210) 0.094 0.200 161 13.42 1.13 0.294 ( 0.208) 0.094 0.200 162 13.50 1.13 0.294 ( 0.207) 0.094 0.200 163 13.58 0.77 0.199 ( 0.206) 0.064 0.135 164 13.67 0.77 0.199 ( 0.205) 0.064 0.135 165 13.75 0.77 0.199 ( 0.204) 0.064 0.135 166 13.83 0.77 0.199 ( 0.203) 0.064 0.135 167 13.92 0.77 0.199 ( 0.202) 0.064 0.135 168 14.00 0.77 0.199 ( 0.201) 0.064 0.135 169 14.08 0.90 0.234 ( 0.200) 0.075 0.159 170 14.17 0.90 0.234 ( 0.199) 0.075 0.159 171 14.25 0.90 0.234 ( 0.198) 0.075 0.159 172 14.33 0.87 0.225 ( 0.197) 0.072 0.153 173 14.42 0.87 0.225 ( 0.196) 0.072 0.153 174 14.50 0.87 0.225 ( 0.195) 0.072 0.153 175 14.58 0.87 0.225 ( 0.194) 0.072 0.153 176 14.67 0.87 0.225 ( 0.193) 0.072 0.153 177 14.75 0.87 0.225 ( 0.192) 0.072 0.153 178 14.83 0.83 0.216 ( 0.191) 0.069 0.147 179 14.92 0.83 0.216 ( 0.190) 0.069 0.147 180 15.00 0.83 0.216 ( 0.189) 0.069 0.147 181 15.08 0.80 0.208 ( 0.188) 0.066 0.141 182 15.17 0.80 0.208 ( 0.187) 0.066 0.141 183 15.25 0.80 0.208 ( 0.186) 0.066 0.141 184 15.33 0.77 0.199 ( 0.185) 0.064 0.135 185 15.42 0.77 0.199 ( 0.184) 0.064 0.135 186 15.50 0.77 0.199 ( 0.183) 0.064 0.135 187 15.58 0.63 0.164 ( 0.182) 0.053 0.112 188 15.67 0.63 0.164 ( 0.182) 0.053 0.112 189 15.75 0.63 0.164 ( 0.181) 0.053 0.112 190 15.83 0.63 0.164 ( 0.180) 0.053 0.112 191 15.92 0.63 0.164 ( 0.179) 0.053 0.112 192 16.00 0.63 0.164 ( 0.178) 0.053 0.112 193 16.08 0.13 0.035 ( 0.177) 0.011 0.024 194 16.17 0.13 0.035 ( 0.176) 0.011 0.024 195 16.25 0.13 0.035 ( 0.175) 0.011 0.024 196 16.33 0.13 0.035 ( 0.174) 0.011 0.024 197 16.42 0.13 0.035 ( 0.173) 0.011 0.024 198 16.50 0.13 0.035 ( 0.172) 0.011 0.024 199 16.58 0.10 0.026 ( 0.172) 0.008 0.018 200 16.67 0.10 0.026 ( 0.171) 0.008 0.018 201 16.75 0.10 0.026 ( 0.170) 0.008 0.018 202 16.83 0.10 0.026 ( 0.169) 0.008 0.018 203 16.92 0.10 0.026 ( 0.168) 0.008 0.018 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 204 17.00 0.10 0.026 ( 0.167) 0.008 0.018 205 17.08 0.17 0.043 ( 0.166) 0.014 0.029 206 17.17 0.17 0.043 ( 0.166) 0.014 0.029 207 17.25 0.17 0.043 ( 0.165) 0.014 0.029 208 17.33 0.17 0.043 ( 0.164) 0.014 0.029 209 17.42 0.17 0.043 ( 0.163) 0.014 0.029 210 17.50 0.17 0.043 ( 0.162) 0.014 0.029 211 17.58 0.17 0.043 ( 0.161) 0.014 0.029 212 17.67 0.17 0.043 ( 0.161) 0.014 0.029 213 17.75 0.17 0.043 ( 0.160) 0.014 0.029 214 17.83 0.13 0.035 ( 0.159) 0.011 0.024 215 17.92 0.13 0.035 ( 0.158) 0.011 0.024 216 18.00 0.13 0.035 ( 0.158) 0.011 0.024 217 18.08 0.13 0.035 ( 0.157) 0.011 0.024 218 18.17 0.13 0.035 ( 0.156) 0.011 0.024 219 18.25 0.13 0.035 ( 0.155) 0.011 0.024 220 18.33 0.13 0.035 ( 0.154) 0.011 0.024 221 18.42 0.13 0.035 ( 0.154) 0.011 0.024 222 18.50 0.13 0.035 ( 0.153) 0.011 0.024 223 18.58 0.10 0.026 ( 0.152) 0.008 0.018 224 18.67 0.10 0.026 ( 0.151) 0.008 0.018 225 18.75 0.10 0.026 ( 0.151) 0.008 0.018 226 18.83 0.07 0.017 ( 0.150) 0.006 0.012 227 18.92 0.07 0.017 ( 0.149) 0.006 0.012 228 19.00 0.07 0.017 ( 0.149) 0.006 0.012 229 19.08 0.10 0.026 ( 0.148) 0.008 0.018 230 19.17 0.10 0.026 ( 0.147) 0.008 0.018 231 19.25 0.10 0.026 ( 0.147) 0.008 0.018 232 19.33 0.13 0.035 ( 0.146) 0.011 0.024 233 19.42 0.13 0.035 ( 0.145) 0.011 0.024 234 19.50 0.13 0.035 ( 0.144) 0.011 0.024 235 19.58 0.10 0.026 ( 0.144) 0.008 0.018 236 19.67 0.10 0.026 ( 0.143) 0.008 0.018 237 19.75 0.10 0.026 ( 0.143) 0.008 0.018 238 19.83 0.07 0.017 ( 0.142) 0.006 0.012 239 19.92 0.07 0.017 ( 0.141) 0.006 0.012 240 20.00 0.07 0.017 ( 0.141) 0.006 0.012 241 20.08 0.10 0.026 ( 0.140) 0.008 0.018 242 20.17 0.10 0.026 ( 0.139) 0.008 0.018 243 20.25 0.10 0.026 ( 0.139) 0.008 0.018 244 20.33 0.10 0.026 ( 0.138) 0.008 0.018 245 20.42 0.10 0.026 ( 0.138) 0.008 0.018 246 20.50 0.10 0.026 ( 0.137) 0.008 0.018 247 20.58 0.10 0.026 ( 0.136) 0.008 0.018 248 20.67 0.10 0.026 ( 0.136) 0.008 0.018 249 20.75 0.10 0.026 ( 0.135) 0.008 0.018 250 20.83 0.07 0.017 ( 0.135) 0.006 0.012 251 20.92 0.07 0.017 ( 0.134) 0.006 0.012 252 21.00 0.07 0.017 ( 0.134) 0.006 0.012 253 21.08 0.10 0.026 ( 0.133) 0.008 0.018 254 21.17 0.10 0.026 ( 0.133) 0.008 0.018 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 255 21.25 0.10 0.026 ( 0.132) 0.008 0.018 256 21.33 0.07 0.017 ( 0.132) 0.006 0.012 257 21.42 0.07 0.017 ( 0.131) 0.006 0.012 258 21.50 0.07 0.017 ( 0.131) 0.006 0.012 259 21.58 0.10 0.026 ( 0.130) 0.008 0.018 260 21.67 0.10 0.026 ( 0.130) 0.008 0.018 261 21.75 0.10 0.026 ( 0.129) 0.008 0.018 262 21.83 0.07 0.017 ( 0.129) 0.006 0.012 263 21.92 0.07 0.017 ( 0.128) 0.006 0.012 264 22.00 0.07 0.017 ( 0.128) 0.006 0.012 265 22.08 0.10 0.026 ( 0.127) 0.008 0.018 266 22.17 0.10 0.026 ( 0.127) 0.008 0.018 267 22.25 0.10 0.026 ( 0.127) 0.008 0.018 268 22.33 0.07 0.017 ( 0.126) 0.006 0.012 269 22.42 0.07 0.017 ( 0.126) 0.006 0.012 270 22.50 0.07 0.017 ( 0.125) 0.006 0.012 271 22.58 0.07 0.017 ( 0.125) 0.006 0.012 272 22.67 0.07 0.017 ( 0.125) 0.006 0.012 273 22.75 0.07 0.017 ( 0.124) 0.006 0.012 274 22.83 0.07 0.017 ( 0.124) 0.006 0.012 275 22.92 0.07 0.017 ( 0.124) 0.006 0.012 276 23.00 0.07 0.017 ( 0.123) 0.006 0.012 277 23.08 0.07 0.017 ( 0.123) 0.006 0.012 278 23.17 0.07 0.017 ( 0.123) 0.006 0.012 279 23.25 0.07 0.017 ( 0.123) 0.006 0.012 280 23.33 0.07 0.017 ( 0.122) 0.006 0.012 281 23.42 0.07 0.017 ( 0.122) 0.006 0.012 282 23.50 0.07 0.017 ( 0.122) 0.006 0.012 283 23.58 0.07 0.017 ( 0.122) 0.006 0.012 284 23.67 0.07 0.017 ( 0.122) 0.006 0.012 285 23.75 0.07 0.017 ( 0.121) 0.006 0.012 286 23.83 0.07 0.017 ( 0.121) 0.006 0.012 287 23.92 0.07 0.017 ( 0.121) 0.006 0.012 288 24.00 0.07 0.017 ( 0.121) 0.006 0.012 (Loss Rate Not Used)
Sum = 100.0 Sum = 17.6 Flood volume = Effective rainfall 1.47(In)
times area 1.9(Ac.)/[(In)/(Ft.)] = 0.2(Ac.Ft) Total soil loss = 0.69(In)
Total soil loss = 0.110(Ac.Ft)
Total rainfall = 2.16(In)
Flood volume = 10193.7 Cubic Feet
Total soil loss = 4797.0 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 0.384(CFS)
-------------------------------------------------------------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 24 - 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
-------------------------------------------------------------------- Hydrograph in 5 Minute intervals ((CFS))
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices -------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 2.5 5.0 7.5 10.0 ----------------------------------------------------------------------- 0+ 5 0.0000 0.00 Q | | | | 0+10 0.0001 0.01 Q | | | | 0+15 0.0002 0.02 Q | | | | 0+20 0.0004 0.02 Q | | | | 0+25 0.0006 0.03 Q | | | | 0+30 0.0008 0.03 Q | | | | 0+35 0.0011 0.03 Q | | | | 0+40 0.0013 0.03 Q | | | | 0+45 0.0015 0.03 Q | | | | 0+50 0.0018 0.04 Q | | | | 0+55 0.0020 0.04 Q | | | | 1+ 0 0.0023 0.04 Q | | | | 1+ 5 0.0026 0.04 Q | | | | 1+10 0.0029 0.04 Q | | | | 1+15 0.0031 0.04 Q | | | | 1+20 0.0034 0.03 Q | | | | 1+25 0.0036 0.03 Q | | | | 1+30 0.0039 0.03 Q | | | | 1+35 0.0041 0.03 Q | | | | 1+40 0.0043 0.03 Q | | | | 1+45 0.0046 0.03 Q | | | | 1+50 0.0048 0.04 Q | | | | 1+55 0.0051 0.04 Q | | | | 2+ 0 0.0054 0.04 Q | | | | 2+ 5 0.0057 0.04 Q | | | | 2+10 0.0060 0.05 QV | | | | 2+15 0.0063 0.05 QV | | | | 2+20 0.0066 0.05 QV | | | | 2+25 0.0069 0.05 QV | | | | 2+30 0.0072 0.05 QV | | | | 2+35 0.0076 0.05 QV | | | | 2+40 0.0079 0.05 QV | | | | 2+45 0.0083 0.05 QV | | | | 2+50 0.0087 0.06 QV | | | | 2+55 0.0091 0.06 QV | | | | 3+ 0 0.0095 0.06 QV | | | | 3+ 5 0.0099 0.06 QV | | | | 3+10 0.0103 0.06 QV | | | | 3+15 0.0106 0.06 QV | | | | 3+20 0.0110 0.06 QV | | | | 3+25 0.0114 0.06 QV | | | | 3+30 0.0118 0.06 Q V | | | | 3+35 0.0122 0.06 Q V | | | | 3+40 0.0126 0.06 Q V | | | | 3+45 0.0130 0.06 Q V | | | | 3+50 0.0134 0.06 Q V | | | | 3+55 0.0138 0.06 Q V | | | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 4+ 0 0.0143 0.07 Q V | | | | 4+ 5 0.0147 0.07 Q V | | | | 4+10 0.0152 0.07 Q V | | | | 4+15 0.0157 0.07 Q V | | | | 4+20 0.0161 0.07 Q V | | | | 4+25 0.0167 0.08 Q V | | | | 4+30 0.0172 0.08 Q V | | | | 4+35 0.0177 0.08 Q V | | | | 4+40 0.0183 0.08 Q V | | | | 4+45 0.0188 0.08 Q V | | | | 4+50 0.0194 0.08 Q V | | | | 4+55 0.0200 0.09 Q V | | | | 5+ 0 0.0206 0.09 Q V | | | | 5+ 5 0.0212 0.09 Q V | | | | 5+10 0.0217 0.08 Q V | | | | 5+15 0.0222 0.07 Q V | | | | 5+20 0.0227 0.07 Q V | | | | 5+25 0.0232 0.08 Q V | | | | 5+30 0.0238 0.08 Q V | | | | 5+35 0.0243 0.08 Q V | | | | 5+40 0.0249 0.09 Q V | | | | 5+45 0.0255 0.09 Q V | | | | 5+50 0.0261 0.09 Q V | | | | 5+55 0.0267 0.09 Q V | | | | 6+ 0 0.0274 0.09 Q V | | | | 6+ 5 0.0280 0.09 Q V | | | | 6+10 0.0287 0.10 Q V | | | | 6+15 0.0294 0.10 Q V | | | | 6+20 0.0301 0.10 Q V | | | | 6+25 0.0308 0.10 Q V | | | | 6+30 0.0315 0.10 Q V | | | | 6+35 0.0322 0.10 Q V | | | | 6+40 0.0329 0.11 Q V | | | | 6+45 0.0337 0.11 Q V | | | | 6+50 0.0345 0.11 Q V | | | | 6+55 0.0352 0.11 Q V | | | | 7+ 0 0.0360 0.11 Q V | | | | 7+ 5 0.0368 0.11 Q V | | | | 7+10 0.0376 0.11 Q V | | | | 7+15 0.0384 0.11 Q V | | | | 7+20 0.0392 0.11 Q V | | | | 7+25 0.0400 0.12 Q V | | | | 7+30 0.0408 0.12 Q V | | | | 7+35 0.0417 0.13 Q V | | | | 7+40 0.0426 0.13 Q V | | | | 7+45 0.0435 0.13 Q V | | | | 7+50 0.0445 0.14 Q V | | | | 7+55 0.0454 0.14 Q V | | | | 8+ 0 0.0464 0.15 Q V | | | | 8+ 5 0.0475 0.15 Q V | | | | 8+10 0.0486 0.16 Q V | | | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 8+15 0.0497 0.17 Q V | | | | 8+20 0.0509 0.17 Q V | | | | 8+25 0.0521 0.17 Q V | | | | 8+30 0.0532 0.17 Q V| | | | 8+35 0.0544 0.17 Q V| | | | 8+40 0.0556 0.18 Q V| | | | 8+45 0.0569 0.18 Q V| | | | 8+50 0.0581 0.18 Q V| | | | 8+55 0.0594 0.19 Q V | | | 9+ 0 0.0607 0.19 Q V | | | 9+ 5 0.0620 0.19 Q V | | | 9+10 0.0635 0.21 Q V | | | 9+15 0.0649 0.21 Q |V | | | 9+20 0.0664 0.21 Q |V | | | 9+25 0.0679 0.22 Q |V | | | 9+30 0.0695 0.22 Q |V | | | 9+35 0.0710 0.23 Q | V | | | 9+40 0.0727 0.23 Q | V | | | 9+45 0.0743 0.24 Q | V | | | 9+50 0.0759 0.24 Q | V | | | 9+55 0.0776 0.24 Q | V | | | 10+ 0 0.0793 0.25 Q | V | | | 10+ 5 0.0810 0.24 Q | V | | | 10+10 0.0823 0.20 Q | V | | | 10+15 0.0836 0.18 Q | V | | | 10+20 0.0848 0.17 Q | V | | | 10+25 0.0860 0.17 Q | V | | | 10+30 0.0871 0.17 Q | V | | | 10+35 0.0884 0.18 Q | V | | | 10+40 0.0898 0.21 Q | V | | | 10+45 0.0913 0.22 Q | V | | | 10+50 0.0928 0.22 Q | V | | | 10+55 0.0944 0.23 Q | V | | | 11+ 0 0.0959 0.23 Q | V | | | 11+ 5 0.0975 0.23 Q | V | | | 11+10 0.0990 0.22 Q | V | | | 11+15 0.1005 0.22 Q | V | | | 11+20 0.1020 0.22 Q | V | | | 11+25 0.1034 0.22 Q | V | | | 11+30 0.1049 0.22 Q | V | | | 11+35 0.1064 0.21 Q | V | | | 11+40 0.1078 0.20 Q | V | | | 11+45 0.1091 0.20 Q | V | | | 11+50 0.1105 0.20 Q | V | | | 11+55 0.1119 0.20 Q | V| | | 12+ 0 0.1132 0.20 Q | V| | | 12+ 5 0.1147 0.21 Q | V| | | 12+10 0.1165 0.25 |Q | V| | | 12+15 0.1183 0.27 |Q | V | | 12+20 0.1202 0.28 |Q | V | | 12+25 0.1222 0.29 |Q | V | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 12+30 0.1242 0.29 |Q | |V | | 12+35 0.1263 0.30 |Q | |V | | 12+40 0.1284 0.31 |Q | |V | | 12+45 0.1306 0.31 |Q | | V | | 12+50 0.1327 0.32 |Q | | V | | 12+55 0.1350 0.32 |Q | | V | | 13+ 0 0.1372 0.33 |Q | | V | | 13+ 5 0.1395 0.33 |Q | | V | | 13+10 0.1420 0.36 |Q | | V | | 13+15 0.1446 0.38 |Q | | V | | 13+20 0.1472 0.38 |Q | | V | | 13+25 0.1499 0.38 |Q | | V | | 13+30 0.1525 0.38 |Q | | V | | 13+35 0.1551 0.37 |Q | | V | | 13+40 0.1572 0.31 |Q | | V | | 13+45 0.1591 0.28 |Q | | V | | 13+50 0.1610 0.27 |Q | | V | | 13+55 0.1628 0.26 |Q | | V | | 14+ 0 0.1646 0.26 |Q | | V | | 14+ 5 0.1664 0.27 |Q | | V | | 14+10 0.1684 0.29 |Q | | V | | 14+15 0.1705 0.30 |Q | | V| | 14+20 0.1726 0.30 |Q | | V| | 14+25 0.1746 0.30 |Q | | V| | 14+30 0.1766 0.30 |Q | | V | 14+35 0.1787 0.29 |Q | | V | 14+40 0.1807 0.29 |Q | | V | 14+45 0.1827 0.29 |Q | | |V | 14+50 0.1848 0.29 |Q | | |V | 14+55 0.1867 0.29 |Q | | |V | 15+ 0 0.1887 0.28 |Q | | | V | 15+ 5 0.1906 0.28 |Q | | | V | 15+10 0.1925 0.28 |Q | | | V | 15+15 0.1944 0.27 |Q | | | V | 15+20 0.1963 0.27 |Q | | | V | 15+25 0.1981 0.26 |Q | | | V | 15+30 0.1999 0.26 |Q | | | V | 15+35 0.2017 0.26 |Q | | | V | 15+40 0.2033 0.23 Q | | | V | 15+45 0.2048 0.22 Q | | | V | 15+50 0.2063 0.22 Q | | | V | 15+55 0.2078 0.22 Q | | | V | 16+ 0 0.2093 0.22 Q | | | V | 16+ 5 0.2107 0.20 Q | | | V | 16+10 0.2114 0.11 Q | | | V | 16+15 0.2119 0.07 Q | | | V | 16+20 0.2123 0.06 Q | | | V | 16+25 0.2126 0.05 Q | | | V | 16+30 0.2129 0.05 Q | | | V | 16+35 0.2133 0.05 Q | | | V | 16+40 0.2135 0.04 Q | | | V | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 16+45 0.2138 0.04 Q | | | V | 16+50 0.2140 0.03 Q | | | V | 16+55 0.2142 0.03 Q | | | V | 17+ 0 0.2145 0.03 Q | | | V | 17+ 5 0.2147 0.04 Q | | | V | 17+10 0.2151 0.05 Q | | | V | 17+15 0.2154 0.05 Q | | | V | 17+20 0.2158 0.06 Q | | | V | 17+25 0.2162 0.06 Q | | | V | 17+30 0.2166 0.06 Q | | | V | 17+35 0.2170 0.06 Q | | | V | 17+40 0.2174 0.06 Q | | | V | 17+45 0.2177 0.06 Q | | | V | 17+50 0.2181 0.06 Q | | | V | 17+55 0.2185 0.05 Q | | | V | 18+ 0 0.2188 0.05 Q | | | V | 18+ 5 0.2191 0.05 Q | | | V | 18+10 0.2194 0.05 Q | | | V | 18+15 0.2197 0.05 Q | | | V | 18+20 0.2200 0.05 Q | | | V | 18+25 0.2204 0.05 Q | | | V | 18+30 0.2207 0.05 Q | | | V | 18+35 0.2210 0.04 Q | | | V | 18+40 0.2212 0.04 Q | | | V | 18+45 0.2215 0.04 Q | | | V | 18+50 0.2217 0.03 Q | | | V | 18+55 0.2219 0.03 Q | | | V | 19+ 0 0.2221 0.02 Q | | | V | 19+ 5 0.2222 0.02 Q | | | V | 19+10 0.2224 0.03 Q | | | V | 19+15 0.2227 0.03 Q | | | V | 19+20 0.2229 0.03 Q | | | V | 19+25 0.2232 0.04 Q | | | V | 19+30 0.2235 0.04 Q | | | V | 19+35 0.2238 0.04 Q | | | V | 19+40 0.2240 0.04 Q | | | V | 19+45 0.2243 0.04 Q | | | V | 19+50 0.2245 0.03 Q | | | V | 19+55 0.2247 0.03 Q | | | V | 20+ 0 0.2249 0.02 Q | | | V | 20+ 5 0.2250 0.02 Q | | | V | 20+10 0.2253 0.03 Q | | | V | 20+15 0.2255 0.03 Q | | | V | 20+20 0.2257 0.03 Q | | | V | 20+25 0.2259 0.03 Q | | | V | 20+30 0.2262 0.03 Q | | | V | 20+35 0.2264 0.03 Q | | | V | 20+40 0.2266 0.03 Q | | | V | 20+45 0.2269 0.03 Q | | | V | 20+50 0.2271 0.03 Q | | | V | 20+55 0.2273 0.03 Q | | | V | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 21+ 0 0.2275 0.02 Q | | | V | 21+ 5 0.2276 0.02 Q | | | V | 21+10 0.2278 0.03 Q | | | V | 21+15 0.2281 0.03 Q | | | V | 21+20 0.2283 0.03 Q | | | V| 21+25 0.2285 0.03 Q | | | V| 21+30 0.2286 0.02 Q | | | V| 21+35 0.2288 0.02 Q | | | V| 21+40 0.2290 0.03 Q | | | V| 21+45 0.2292 0.03 Q | | | V| 21+50 0.2294 0.03 Q | | | V| 21+55 0.2296 0.03 Q | | | V| 22+ 0 0.2298 0.02 Q | | | V| 22+ 5 0.2300 0.02 Q | | | V| 22+10 0.2302 0.03 Q | | | V| 22+15 0.2304 0.03 Q | | | V| 22+20 0.2306 0.03 Q | | | V| 22+25 0.2308 0.03 Q | | | V| 22+30 0.2310 0.02 Q | | | V| 22+35 0.2311 0.02 Q | | | V| 22+40 0.2313 0.02 Q | | | V| 22+45 0.2314 0.02 Q | | | V| 22+50 0.2316 0.02 Q | | | V| 22+55 0.2317 0.02 Q | | | V| 23+ 0 0.2319 0.02 Q | | | V| 23+ 5 0.2321 0.02 Q | | | V| 23+10 0.2322 0.02 Q | | | V| 23+15 0.2324 0.02 Q | | | V| 23+20 0.2325 0.02 Q | | | V| 23+25 0.2327 0.02 Q | | | V| 23+30 0.2328 0.02 Q | | | V| 23+35 0.2330 0.02 Q | | | V| 23+40 0.2332 0.02 Q | | | V| 23+45 0.2333 0.02 Q | | | V| 23+50 0.2335 0.02 Q | | | V| 23+55 0.2336 0.02 Q | | | V| 24+ 0 0.2338 0.02 Q | | | V| 24+ 5 0.2339 0.02 Q | | | V| 24+10 0.2340 0.01 Q | | | V| 24+15 0.2340 0.00 Q | | | V| 24+20 0.2340 0.00 Q | | | V| 24+25 0.2340 0.00 Q | | | V| 24+30 0.2340 0.00 Q | | | V| 24+35 0.2340 0.00 Q | | | V ----------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 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 - 2018, Version 9.0 Study date 10/07/24 File: rchph1a110.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6443
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- RCH Garage
DMA A
Kimley-Horn
10 yr
-------------------------------------------------------------------- Drainage Area = 1.91(Ac.) = 0.003 Sq. Mi.

Drainage Area for Depth-Area Areal Adjustment = 1.91(Ac.) =

0.003 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.095 Hr.

Lag time = 5.70 Min.
25% of lag time = 1.43 Min.
40% of lag time = 2.28 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]

1.91 0.50 0.95
100 YEAR Area rainfall data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.91 1.10 2.10
STORM EVENT (YEAR) = 10.00
Area Averaged 2-Year Rainfall = 0.500(In)
Area Averaged 100-Year Rainfall = 1.100(In)
Point rain (area averaged) = 0.747(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 0.747(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

1.910 56.00 0.730
Total Area Entered = 1.91(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-2 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

Drainage Area for Depth-Area Areal Adjustment = 1.91(Ac.) =

0.003 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.095 Hr.

Lag time = 5.70 Min.
25% of lag time = 1.43 Min.
40% of lag time = 2.28 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]

1.91 0.80 1.53
100 YEAR Area rainfall data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.91 1.80 3.44
STORM EVENT (YEAR) = 10.00
Area Averaged 2-Year Rainfall = 0.800(In)
Area Averaged 100-Year Rainfall = 1.800(In)
Point rain (area averaged) = 1.211(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 1.211(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

1.910 56.00 0.730
Total Area Entered = 1.91(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-2 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

Drainage Area for Depth-Area Areal Adjustment = 1.91(Ac.) =

0.003 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.095 Hr.

Lag time = 5.70 Min.
25% of lag time = 1.43 Min.
40% of lag time = 2.28 Min.

Unit time = 5.00 Min.

Duration of storm = 6 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.91 1.00 1.91
100 YEAR Area rainfall data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.91 2.50 4.77
STORM EVENT (YEAR) = 10.00
Area Averaged 2-Year Rainfall = 1.000(In)
Area Averaged 100-Year Rainfall = 2.500(In)
Point rain (area averaged) = 1.617(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 1.617(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

1.910 56.00 0.730
Total Area Entered = 1.91(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-2 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

Drainage Area for Depth-Area Areal Adjustment = 1.91(Ac.) =

0.003 Sq. Mi.

USER Entry of lag time in hours
Lag time = 0.095 Hr.

Lag time = 5.70 Min.
25% of lag time = 1.43 Min.
40% of lag time = 2.28 Min.

Unit time = 5.00 Min.

Duration of storm = 24 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.91 1.60 3.06
100 YEAR Area rainfall data:

PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices Area(Ac.)[1] Rainfall(In)[2] Weighting[1*2]

1.91 4.00 7.64
STORM EVENT (YEAR) = 10.00
Area Averaged 2-Year Rainfall = 1.600(In)
Area Averaged 100-Year Rainfall = 4.000(In)
Point rain (area averaged) = 2.587(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 2.587(In)
Sub-Area Data:

Area(Ac.) Runoff Index Impervious %

1.910 56.00 0.730
Total Area Entered = 1.91(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F AMC2 AMC-2 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

56.0 56.0 0.511 0.730 0.175 1.000 0.175 Sum (F) = 0.175
Area averaged mean soil loss (F) (In/Hr) = 0.175
Minimum soil loss rate ((In/Hr)) = 0.088
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.320
--------------------------------------------------------------------- U n i t H y d r o g r a p h
FOOTHILL S-Curve
-------------------------------------------------------------------- Unit Hydrograph Data
--------------------------------------------------------------------- Unit time period Time % of lag Distribution Unit Hydrograph (hrs) Graph % (CFS) --------------------------------------------------------------------- 1 0.083 87.719 10.710 0.206 2 0.167 175.439 52.537 1.011 3 0.250 263.158 21.572 0.415 4 0.333 350.877 8.833 0.170 5 0.417 438.596 3.926 0.076 6 0.500 526.316 1.230 0.024 7 0.583 614.035 0.656 0.013 8 0.667 701.754 0.537 0.010 Sum = 100.000 Sum= 1.925
----------------------------------------------------------------------- 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 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices (Hr.) Percent (In/Hr) Max | Low (In/Hr) 1 0.08 0.07 0.021 ( 0.311) 0.007 0.014 2 0.17 0.07 0.021 ( 0.309) 0.007 0.014 3 0.25 0.07 0.021 ( 0.308) 0.007 0.014 4 0.33 0.10 0.031 ( 0.307) 0.010 0.021 5 0.42 0.10 0.031 ( 0.306) 0.010 0.021 6 0.50 0.10 0.031 ( 0.305) 0.010 0.021 7 0.58 0.10 0.031 ( 0.303) 0.010 0.021 8 0.67 0.10 0.031 ( 0.302) 0.010 0.021 9 0.75 0.10 0.031 ( 0.301) 0.010 0.021 10 0.83 0.13 0.041 ( 0.300) 0.013 0.028 11 0.92 0.13 0.041 ( 0.299) 0.013 0.028 12 1.00 0.13 0.041 ( 0.298) 0.013 0.028 13 1.08 0.10 0.031 ( 0.296) 0.010 0.021 14 1.17 0.10 0.031 ( 0.295) 0.010 0.021 15 1.25 0.10 0.031 ( 0.294) 0.010 0.021 16 1.33 0.10 0.031 ( 0.293) 0.010 0.021 17 1.42 0.10 0.031 ( 0.292) 0.010 0.021 18 1.50 0.10 0.031 ( 0.290) 0.010 0.021 19 1.58 0.10 0.031 ( 0.289) 0.010 0.021 20 1.67 0.10 0.031 ( 0.288) 0.010 0.021 21 1.75 0.10 0.031 ( 0.287) 0.010 0.021 22 1.83 0.13 0.041 ( 0.286) 0.013 0.028 23 1.92 0.13 0.041 ( 0.285) 0.013 0.028 24 2.00 0.13 0.041 ( 0.284) 0.013 0.028 25 2.08 0.13 0.041 ( 0.282) 0.013 0.028 26 2.17 0.13 0.041 ( 0.281) 0.013 0.028 27 2.25 0.13 0.041 ( 0.280) 0.013 0.028 28 2.33 0.13 0.041 ( 0.279) 0.013 0.028 29 2.42 0.13 0.041 ( 0.278) 0.013 0.028 30 2.50 0.13 0.041 ( 0.277) 0.013 0.028 31 2.58 0.17 0.052 ( 0.276) 0.017 0.035 32 2.67 0.17 0.052 ( 0.274) 0.017 0.035 33 2.75 0.17 0.052 ( 0.273) 0.017 0.035 34 2.83 0.17 0.052 ( 0.272) 0.017 0.035 35 2.92 0.17 0.052 ( 0.271) 0.017 0.035 36 3.00 0.17 0.052 ( 0.270) 0.017 0.035 37 3.08 0.17 0.052 ( 0.269) 0.017 0.035 38 3.17 0.17 0.052 ( 0.268) 0.017 0.035 39 3.25 0.17 0.052 ( 0.267) 0.017 0.035 40 3.33 0.17 0.052 ( 0.265) 0.017 0.035 41 3.42 0.17 0.052 ( 0.264) 0.017 0.035 42 3.50 0.17 0.052 ( 0.263) 0.017 0.035 43 3.58 0.17 0.052 ( 0.262) 0.017 0.035 44 3.67 0.17 0.052 ( 0.261) 0.017 0.035 45 3.75 0.17 0.052 ( 0.260) 0.017 0.035 46 3.83 0.20 0.062 ( 0.259) 0.020 0.042 47 3.92 0.20 0.062 ( 0.258) 0.020 0.042 48 4.00 0.20 0.062 ( 0.257) 0.020 0.042 49 4.08 0.20 0.062 ( 0.256) 0.020 0.042 50 4.17 0.20 0.062 ( 0.255) 0.020 0.042 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 51 4.25 0.20 0.062 ( 0.253) 0.020 0.042 52 4.33 0.23 0.072 ( 0.252) 0.023 0.049 53 4.42 0.23 0.072 ( 0.251) 0.023 0.049 54 4.50 0.23 0.072 ( 0.250) 0.023 0.049 55 4.58 0.23 0.072 ( 0.249) 0.023 0.049 56 4.67 0.23 0.072 ( 0.248) 0.023 0.049 57 4.75 0.23 0.072 ( 0.247) 0.023 0.049 58 4.83 0.27 0.083 ( 0.246) 0.026 0.056 59 4.92 0.27 0.083 ( 0.245) 0.026 0.056 60 5.00 0.27 0.083 ( 0.244) 0.026 0.056 61 5.08 0.20 0.062 ( 0.243) 0.020 0.042 62 5.17 0.20 0.062 ( 0.242) 0.020 0.042 63 5.25 0.20 0.062 ( 0.241) 0.020 0.042 64 5.33 0.23 0.072 ( 0.240) 0.023 0.049 65 5.42 0.23 0.072 ( 0.239) 0.023 0.049 66 5.50 0.23 0.072 ( 0.237) 0.023 0.049 67 5.58 0.27 0.083 ( 0.236) 0.026 0.056 68 5.67 0.27 0.083 ( 0.235) 0.026 0.056 69 5.75 0.27 0.083 ( 0.234) 0.026 0.056 70 5.83 0.27 0.083 ( 0.233) 0.026 0.056 71 5.92 0.27 0.083 ( 0.232) 0.026 0.056 72 6.00 0.27 0.083 ( 0.231) 0.026 0.056 73 6.08 0.30 0.093 ( 0.230) 0.030 0.063 74 6.17 0.30 0.093 ( 0.229) 0.030 0.063 75 6.25 0.30 0.093 ( 0.228) 0.030 0.063 76 6.33 0.30 0.093 ( 0.227) 0.030 0.063 77 6.42 0.30 0.093 ( 0.226) 0.030 0.063 78 6.50 0.30 0.093 ( 0.225) 0.030 0.063 79 6.58 0.33 0.103 ( 0.224) 0.033 0.070 80 6.67 0.33 0.103 ( 0.223) 0.033 0.070 81 6.75 0.33 0.103 ( 0.222) 0.033 0.070 82 6.83 0.33 0.103 ( 0.221) 0.033 0.070 83 6.92 0.33 0.103 ( 0.220) 0.033 0.070 84 7.00 0.33 0.103 ( 0.219) 0.033 0.070 85 7.08 0.33 0.103 ( 0.218) 0.033 0.070 86 7.17 0.33 0.103 ( 0.217) 0.033 0.070 87 7.25 0.33 0.103 ( 0.216) 0.033 0.070 88 7.33 0.37 0.114 ( 0.215) 0.036 0.077 89 7.42 0.37 0.114 ( 0.214) 0.036 0.077 90 7.50 0.37 0.114 ( 0.213) 0.036 0.077 91 7.58 0.40 0.124 ( 0.212) 0.040 0.084 92 7.67 0.40 0.124 ( 0.211) 0.040 0.084 93 7.75 0.40 0.124 ( 0.210) 0.040 0.084 94 7.83 0.43 0.135 ( 0.209) 0.043 0.091 95 7.92 0.43 0.135 ( 0.208) 0.043 0.091 96 8.00 0.43 0.135 ( 0.207) 0.043 0.091 97 8.08 0.50 0.155 ( 0.206) 0.050 0.106 98 8.17 0.50 0.155 ( 0.205) 0.050 0.106 99 8.25 0.50 0.155 ( 0.204) 0.050 0.106 100 8.33 0.50 0.155 ( 0.204) 0.050 0.106 101 8.42 0.50 0.155 ( 0.203) 0.050 0.106 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 102 8.50 0.50 0.155 ( 0.202) 0.050 0.106 103 8.58 0.53 0.166 ( 0.201) 0.053 0.113 104 8.67 0.53 0.166 ( 0.200) 0.053 0.113 105 8.75 0.53 0.166 ( 0.199) 0.053 0.113 106 8.83 0.57 0.176 ( 0.198) 0.056 0.120 107 8.92 0.57 0.176 ( 0.197) 0.056 0.120 108 9.00 0.57 0.176 ( 0.196) 0.056 0.120 109 9.08 0.63 0.197 ( 0.195) 0.063 0.134 110 9.17 0.63 0.197 ( 0.194) 0.063 0.134 111 9.25 0.63 0.197 ( 0.193) 0.063 0.134 112 9.33 0.67 0.207 ( 0.192) 0.066 0.141 113 9.42 0.67 0.207 ( 0.191) 0.066 0.141 114 9.50 0.67 0.207 ( 0.190) 0.066 0.141 115 9.58 0.70 0.217 ( 0.190) 0.070 0.148 116 9.67 0.70 0.217 ( 0.189) 0.070 0.148 117 9.75 0.70 0.217 ( 0.188) 0.070 0.148 118 9.83 0.73 0.228 ( 0.187) 0.073 0.155 119 9.92 0.73 0.228 ( 0.186) 0.073 0.155 120 10.00 0.73 0.228 ( 0.185) 0.073 0.155 121 10.08 0.50 0.155 ( 0.184) 0.050 0.106 122 10.17 0.50 0.155 ( 0.183) 0.050 0.106 123 10.25 0.50 0.155 ( 0.182) 0.050 0.106 124 10.33 0.50 0.155 ( 0.181) 0.050 0.106 125 10.42 0.50 0.155 ( 0.181) 0.050 0.106 126 10.50 0.50 0.155 ( 0.180) 0.050 0.106 127 10.58 0.67 0.207 ( 0.179) 0.066 0.141 128 10.67 0.67 0.207 ( 0.178) 0.066 0.141 129 10.75 0.67 0.207 ( 0.177) 0.066 0.141 130 10.83 0.67 0.207 ( 0.176) 0.066 0.141 131 10.92 0.67 0.207 ( 0.175) 0.066 0.141 132 11.00 0.67 0.207 ( 0.174) 0.066 0.141 133 11.08 0.63 0.197 ( 0.174) 0.063 0.134 134 11.17 0.63 0.197 ( 0.173) 0.063 0.134 135 11.25 0.63 0.197 ( 0.172) 0.063 0.134 136 11.33 0.63 0.197 ( 0.171) 0.063 0.134 137 11.42 0.63 0.197 ( 0.170) 0.063 0.134 138 11.50 0.63 0.197 ( 0.169) 0.063 0.134 139 11.58 0.57 0.176 ( 0.169) 0.056 0.120 140 11.67 0.57 0.176 ( 0.168) 0.056 0.120 141 11.75 0.57 0.176 ( 0.167) 0.056 0.120 142 11.83 0.60 0.186 ( 0.166) 0.060 0.127 143 11.92 0.60 0.186 ( 0.165) 0.060 0.127 144 12.00 0.60 0.186 ( 0.164) 0.060 0.127 145 12.08 0.83 0.259 ( 0.164) 0.083 0.176 146 12.17 0.83 0.259 ( 0.163) 0.083 0.176 147 12.25 0.83 0.259 ( 0.162) 0.083 0.176 148 12.33 0.87 0.269 ( 0.161) 0.086 0.183 149 12.42 0.87 0.269 ( 0.160) 0.086 0.183 150 12.50 0.87 0.269 ( 0.159) 0.086 0.183 151 12.58 0.93 0.290 ( 0.159) 0.093 0.197 152 12.67 0.93 0.290 ( 0.158) 0.093 0.197 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 153 12.75 0.93 0.290 ( 0.157) 0.093 0.197 154 12.83 0.97 0.300 ( 0.156) 0.096 0.204 155 12.92 0.97 0.300 ( 0.156) 0.096 0.204 156 13.00 0.97 0.300 ( 0.155) 0.096 0.204 157 13.08 1.13 0.352 ( 0.154) 0.113 0.239 158 13.17 1.13 0.352 ( 0.153) 0.113 0.239 159 13.25 1.13 0.352 ( 0.152) 0.113 0.239 160 13.33 1.13 0.352 ( 0.152) 0.113 0.239 161 13.42 1.13 0.352 ( 0.151) 0.113 0.239 162 13.50 1.13 0.352 ( 0.150) 0.113 0.239 163 13.58 0.77 0.238 ( 0.149) 0.076 0.162 164 13.67 0.77 0.238 ( 0.149) 0.076 0.162 165 13.75 0.77 0.238 ( 0.148) 0.076 0.162 166 13.83 0.77 0.238 ( 0.147) 0.076 0.162 167 13.92 0.77 0.238 ( 0.146) 0.076 0.162 168 14.00 0.77 0.238 ( 0.146) 0.076 0.162 169 14.08 0.90 0.279 ( 0.145) 0.089 0.190 170 14.17 0.90 0.279 ( 0.144) 0.089 0.190 171 14.25 0.90 0.279 ( 0.143) 0.089 0.190 172 14.33 0.87 0.269 ( 0.143) 0.086 0.183 173 14.42 0.87 0.269 ( 0.142) 0.086 0.183 174 14.50 0.87 0.269 ( 0.141) 0.086 0.183 175 14.58 0.87 0.269 ( 0.140) 0.086 0.183 176 14.67 0.87 0.269 ( 0.140) 0.086 0.183 177 14.75 0.87 0.269 ( 0.139) 0.086 0.183 178 14.83 0.83 0.259 ( 0.138) 0.083 0.176 179 14.92 0.83 0.259 ( 0.138) 0.083 0.176 180 15.00 0.83 0.259 ( 0.137) 0.083 0.176 181 15.08 0.80 0.248 ( 0.136) 0.079 0.169 182 15.17 0.80 0.248 ( 0.135) 0.079 0.169 183 15.25 0.80 0.248 ( 0.135) 0.079 0.169 184 15.33 0.77 0.238 ( 0.134) 0.076 0.162 185 15.42 0.77 0.238 ( 0.133) 0.076 0.162 186 15.50 0.77 0.238 ( 0.133) 0.076 0.162 187 15.58 0.63 0.197 ( 0.132) 0.063 0.134 188 15.67 0.63 0.197 ( 0.131) 0.063 0.134 189 15.75 0.63 0.197 ( 0.131) 0.063 0.134 190 15.83 0.63 0.197 ( 0.130) 0.063 0.134 191 15.92 0.63 0.197 ( 0.129) 0.063 0.134 192 16.00 0.63 0.197 ( 0.129) 0.063 0.134 193 16.08 0.13 0.041 ( 0.128) 0.013 0.028 194 16.17 0.13 0.041 ( 0.127) 0.013 0.028 195 16.25 0.13 0.041 ( 0.127) 0.013 0.028 196 16.33 0.13 0.041 ( 0.126) 0.013 0.028 197 16.42 0.13 0.041 ( 0.125) 0.013 0.028 198 16.50 0.13 0.041 ( 0.125) 0.013 0.028 199 16.58 0.10 0.031 ( 0.124) 0.010 0.021 200 16.67 0.10 0.031 ( 0.124) 0.010 0.021 201 16.75 0.10 0.031 ( 0.123) 0.010 0.021 202 16.83 0.10 0.031 ( 0.122) 0.010 0.021 203 16.92 0.10 0.031 ( 0.122) 0.010 0.021 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 204 17.00 0.10 0.031 ( 0.121) 0.010 0.021 205 17.08 0.17 0.052 ( 0.120) 0.017 0.035 206 17.17 0.17 0.052 ( 0.120) 0.017 0.035 207 17.25 0.17 0.052 ( 0.119) 0.017 0.035 208 17.33 0.17 0.052 ( 0.119) 0.017 0.035 209 17.42 0.17 0.052 ( 0.118) 0.017 0.035 210 17.50 0.17 0.052 ( 0.117) 0.017 0.035 211 17.58 0.17 0.052 ( 0.117) 0.017 0.035 212 17.67 0.17 0.052 ( 0.116) 0.017 0.035 213 17.75 0.17 0.052 ( 0.116) 0.017 0.035 214 17.83 0.13 0.041 ( 0.115) 0.013 0.028 215 17.92 0.13 0.041 ( 0.115) 0.013 0.028 216 18.00 0.13 0.041 ( 0.114) 0.013 0.028 217 18.08 0.13 0.041 ( 0.113) 0.013 0.028 218 18.17 0.13 0.041 ( 0.113) 0.013 0.028 219 18.25 0.13 0.041 ( 0.112) 0.013 0.028 220 18.33 0.13 0.041 ( 0.112) 0.013 0.028 221 18.42 0.13 0.041 ( 0.111) 0.013 0.028 222 18.50 0.13 0.041 ( 0.111) 0.013 0.028 223 18.58 0.10 0.031 ( 0.110) 0.010 0.021 224 18.67 0.10 0.031 ( 0.110) 0.010 0.021 225 18.75 0.10 0.031 ( 0.109) 0.010 0.021 226 18.83 0.07 0.021 ( 0.109) 0.007 0.014 227 18.92 0.07 0.021 ( 0.108) 0.007 0.014 228 19.00 0.07 0.021 ( 0.108) 0.007 0.014 229 19.08 0.10 0.031 ( 0.107) 0.010 0.021 230 19.17 0.10 0.031 ( 0.107) 0.010 0.021 231 19.25 0.10 0.031 ( 0.106) 0.010 0.021 232 19.33 0.13 0.041 ( 0.106) 0.013 0.028 233 19.42 0.13 0.041 ( 0.105) 0.013 0.028 234 19.50 0.13 0.041 ( 0.105) 0.013 0.028 235 19.58 0.10 0.031 ( 0.104) 0.010 0.021 236 19.67 0.10 0.031 ( 0.104) 0.010 0.021 237 19.75 0.10 0.031 ( 0.103) 0.010 0.021 238 19.83 0.07 0.021 ( 0.103) 0.007 0.014 239 19.92 0.07 0.021 ( 0.102) 0.007 0.014 240 20.00 0.07 0.021 ( 0.102) 0.007 0.014 241 20.08 0.10 0.031 ( 0.101) 0.010 0.021 242 20.17 0.10 0.031 ( 0.101) 0.010 0.021 243 20.25 0.10 0.031 ( 0.100) 0.010 0.021 244 20.33 0.10 0.031 ( 0.100) 0.010 0.021 245 20.42 0.10 0.031 ( 0.100) 0.010 0.021 246 20.50 0.10 0.031 ( 0.099) 0.010 0.021 247 20.58 0.10 0.031 ( 0.099) 0.010 0.021 248 20.67 0.10 0.031 ( 0.098) 0.010 0.021 249 20.75 0.10 0.031 ( 0.098) 0.010 0.021 250 20.83 0.07 0.021 ( 0.097) 0.007 0.014 251 20.92 0.07 0.021 ( 0.097) 0.007 0.014 252 21.00 0.07 0.021 ( 0.097) 0.007 0.014 253 21.08 0.10 0.031 ( 0.096) 0.010 0.021 254 21.17 0.10 0.031 ( 0.096) 0.010 0.021 PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 255 21.25 0.10 0.031 ( 0.096) 0.010 0.021 256 21.33 0.07 0.021 ( 0.095) 0.007 0.014 257 21.42 0.07 0.021 ( 0.095) 0.007 0.014 258 21.50 0.07 0.021 ( 0.094) 0.007 0.014 259 21.58 0.10 0.031 ( 0.094) 0.010 0.021 260 21.67 0.10 0.031 ( 0.094) 0.010 0.021 261 21.75 0.10 0.031 ( 0.093) 0.010 0.021 262 21.83 0.07 0.021 ( 0.093) 0.007 0.014 263 21.92 0.07 0.021 ( 0.093) 0.007 0.014 264 22.00 0.07 0.021 ( 0.093) 0.007 0.014 265 22.08 0.10 0.031 ( 0.092) 0.010 0.021 266 22.17 0.10 0.031 ( 0.092) 0.010 0.021 267 22.25 0.10 0.031 ( 0.092) 0.010 0.021 268 22.33 0.07 0.021 ( 0.091) 0.007 0.014 269 22.42 0.07 0.021 ( 0.091) 0.007 0.014 270 22.50 0.07 0.021 ( 0.091) 0.007 0.014 271 22.58 0.07 0.021 ( 0.091) 0.007 0.014 272 22.67 0.07 0.021 ( 0.090) 0.007 0.014 273 22.75 0.07 0.021 ( 0.090) 0.007 0.014 274 22.83 0.07 0.021 ( 0.090) 0.007 0.014 275 22.92 0.07 0.021 ( 0.090) 0.007 0.014 276 23.00 0.07 0.021 ( 0.089) 0.007 0.014 277 23.08 0.07 0.021 ( 0.089) 0.007 0.014 278 23.17 0.07 0.021 ( 0.089) 0.007 0.014 279 23.25 0.07 0.021 ( 0.089) 0.007 0.014 280 23.33 0.07 0.021 ( 0.089) 0.007 0.014 281 23.42 0.07 0.021 ( 0.088) 0.007 0.014 282 23.50 0.07 0.021 ( 0.088) 0.007 0.014 283 23.58 0.07 0.021 ( 0.088) 0.007 0.014 284 23.67 0.07 0.021 ( 0.088) 0.007 0.014 285 23.75 0.07 0.021 ( 0.088) 0.007 0.014 286 23.83 0.07 0.021 ( 0.088) 0.007 0.014 287 23.92 0.07 0.021 ( 0.088) 0.007 0.014 288 24.00 0.07 0.021 ( 0.088) 0.007 0.014 (Loss Rate Not Used)
Sum = 100.0 Sum = 21.1 Flood volume = Effective rainfall 1.76(In)
times area 1.9(Ac.)/[(In)/(Ft.)] = 0.3(Ac.Ft) Total soil loss = 0.83(In)
Total soil loss = 0.132(Ac.Ft)
Total rainfall = 2.59(In)
Flood volume = 12198.5 Cubic Feet
Total soil loss = 5740.5 Cubic Feet
-------------------------------------------------------------------- Peak flow rate of this hydrograph = 0.460(CFS)
-------------------------------------------------------------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 24 - 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
-------------------------------------------------------------------- Hydrograph in 5 Minute intervals ((CFS))
PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices -------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 2.5 5.0 7.5 10.0 ----------------------------------------------------------------------- 0+ 5 0.0000 0.00 Q | | | | 0+10 0.0001 0.02 Q | | | | 0+15 0.0003 0.02 Q | | | | 0+20 0.0005 0.03 Q | | | | 0+25 0.0007 0.04 Q | | | | 0+30 0.0010 0.04 Q | | | | 0+35 0.0013 0.04 Q | | | | 0+40 0.0015 0.04 Q | | | | 0+45 0.0018 0.04 Q | | | | 0+50 0.0021 0.04 Q | | | | 0+55 0.0024 0.05 Q | | | | 1+ 0 0.0028 0.05 Q | | | | 1+ 5 0.0032 0.05 Q | | | | 1+10 0.0035 0.05 Q | | | | 1+15 0.0038 0.04 Q | | | | 1+20 0.0041 0.04 Q | | | | 1+25 0.0043 0.04 Q | | | | 1+30 0.0046 0.04 Q | | | | 1+35 0.0049 0.04 Q | | | | 1+40 0.0052 0.04 Q | | | | 1+45 0.0055 0.04 Q | | | | 1+50 0.0057 0.04 Q | | | | 1+55 0.0061 0.05 Q | | | | 2+ 0 0.0064 0.05 Q | | | | 2+ 5 0.0068 0.05 Q | | | | 2+10 0.0072 0.05 QV | | | | 2+15 0.0076 0.05 QV | | | | 2+20 0.0079 0.05 QV | | | | 2+25 0.0083 0.05 QV | | | | 2+30 0.0087 0.05 QV | | | | 2+35 0.0091 0.06 QV | | | | 2+40 0.0095 0.06 QV | | | | 2+45 0.0099 0.07 QV | | | | 2+50 0.0104 0.07 QV | | | | 2+55 0.0109 0.07 QV | | | | 3+ 0 0.0113 0.07 QV | | | | 3+ 5 0.0118 0.07 QV | | | | 3+10 0.0123 0.07 QV | | | | 3+15 0.0127 0.07 QV | | | | 3+20 0.0132 0.07 QV | | | | 3+25 0.0137 0.07 QV | | | | 3+30 0.0141 0.07 Q V | | | | 3+35 0.0146 0.07 Q V | | | | 3+40 0.0151 0.07 Q V | | | | 3+45 0.0155 0.07 Q V | | | | 3+50 0.0160 0.07 Q V | | | | 3+55 0.0165 0.08 Q V | | | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 4+ 0 0.0171 0.08 Q V | | | | 4+ 5 0.0176 0.08 Q V | | | | 4+10 0.0182 0.08 Q V | | | | 4+15 0.0188 0.08 Q V | | | | 4+20 0.0193 0.08 Q V | | | | 4+25 0.0199 0.09 Q V | | | | 4+30 0.0206 0.09 Q V | | | | 4+35 0.0212 0.09 Q V | | | | 4+40 0.0219 0.09 Q V | | | | 4+45 0.0225 0.09 Q V | | | | 4+50 0.0232 0.10 Q V | | | | 4+55 0.0239 0.10 Q V | | | | 5+ 0 0.0246 0.11 Q V | | | | 5+ 5 0.0254 0.10 Q V | | | | 5+10 0.0260 0.09 Q V | | | | 5+15 0.0266 0.09 Q V | | | | 5+20 0.0272 0.08 Q V | | | | 5+25 0.0278 0.09 Q V | | | | 5+30 0.0284 0.09 Q V | | | | 5+35 0.0291 0.10 Q V | | | | 5+40 0.0298 0.10 Q V | | | | 5+45 0.0305 0.11 Q V | | | | 5+50 0.0313 0.11 Q V | | | | 5+55 0.0320 0.11 Q V | | | | 6+ 0 0.0328 0.11 Q V | | | | 6+ 5 0.0335 0.11 Q V | | | | 6+10 0.0343 0.12 Q V | | | | 6+15 0.0351 0.12 Q V | | | | 6+20 0.0360 0.12 Q V | | | | 6+25 0.0368 0.12 Q V | | | | 6+30 0.0377 0.12 Q V | | | | 6+35 0.0385 0.12 Q V | | | | 6+40 0.0394 0.13 Q V | | | | 6+45 0.0403 0.13 Q V | | | | 6+50 0.0412 0.13 Q V | | | | 6+55 0.0422 0.14 Q V | | | | 7+ 0 0.0431 0.14 Q V | | | | 7+ 5 0.0440 0.14 Q V | | | | 7+10 0.0450 0.14 Q V | | | | 7+15 0.0459 0.14 Q V | | | | 7+20 0.0469 0.14 Q V | | | | 7+25 0.0478 0.14 Q V | | | | 7+30 0.0489 0.15 Q V | | | | 7+35 0.0499 0.15 Q V | | | | 7+40 0.0510 0.16 Q V | | | | 7+45 0.0521 0.16 Q V | | | | 7+50 0.0532 0.16 Q V | | | | 7+55 0.0544 0.17 Q V | | | | 8+ 0 0.0556 0.17 Q V | | | | 8+ 5 0.0568 0.18 Q V | | | | 8+10 0.0581 0.19 Q V | | | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 8+15 0.0595 0.20 Q V | | | | 8+20 0.0609 0.20 Q V | | | | 8+25 0.0623 0.20 Q V | | | | 8+30 0.0637 0.20 Q V| | | | 8+35 0.0651 0.20 Q V| | | | 8+40 0.0666 0.21 Q V| | | | 8+45 0.0680 0.21 Q V| | | | 8+50 0.0695 0.22 Q V| | | | 8+55 0.0711 0.23 Q V | | | 9+ 0 0.0727 0.23 Q V | | | 9+ 5 0.0743 0.23 Q V | | | 9+10 0.0760 0.25 Q V | | | 9+15 0.0777 0.25 |Q |V | | | 9+20 0.0795 0.26 |Q |V | | | 9+25 0.0813 0.27 |Q |V | | | 9+30 0.0832 0.27 |Q |V | | | 9+35 0.0850 0.27 |Q | V | | | 9+40 0.0869 0.28 |Q | V | | | 9+45 0.0889 0.28 |Q | V | | | 9+50 0.0909 0.29 |Q | V | | | 9+55 0.0929 0.29 |Q | V | | | 10+ 0 0.0949 0.30 |Q | V | | | 10+ 5 0.0969 0.29 |Q | V | | | 10+10 0.0985 0.24 Q | V | | | 10+15 0.1000 0.22 Q | V | | | 10+20 0.1015 0.21 Q | V | | | 10+25 0.1029 0.21 Q | V | | | 10+30 0.1043 0.20 Q | V | | | 10+35 0.1057 0.21 Q | V | | | 10+40 0.1074 0.25 Q | V | | | 10+45 0.1092 0.26 |Q | V | | | 10+50 0.1111 0.27 |Q | V | | | 10+55 0.1129 0.27 |Q | V | | | 11+ 0 0.1148 0.27 |Q | V | | | 11+ 5 0.1166 0.27 |Q | V | | | 11+10 0.1184 0.26 |Q | V | | | 11+15 0.1202 0.26 |Q | V | | | 11+20 0.1220 0.26 |Q | V | | | 11+25 0.1238 0.26 |Q | V | | | 11+30 0.1256 0.26 |Q | V | | | 11+35 0.1273 0.25 |Q | V | | | 11+40 0.1290 0.24 Q | V | | | 11+45 0.1306 0.23 Q | V | | | 11+50 0.1322 0.23 Q | V | | | 11+55 0.1339 0.24 Q | V| | | 12+ 0 0.1355 0.24 Q | V| | | 12+ 5 0.1373 0.25 |Q | V| | | 12+10 0.1394 0.30 |Q | V| | | 12+15 0.1416 0.32 |Q | V | | 12+20 0.1439 0.33 |Q | V | | 12+25 0.1463 0.35 |Q | V | | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 12+30 0.1487 0.35 |Q | |V | | 12+35 0.1511 0.35 |Q | |V | | 12+40 0.1537 0.37 |Q | |V | | 12+45 0.1562 0.38 |Q | | V | | 12+50 0.1588 0.38 |Q | | V | | 12+55 0.1615 0.39 |Q | | V | | 13+ 0 0.1642 0.39 |Q | | V | | 13+ 5 0.1670 0.40 |Q | | V | | 13+10 0.1700 0.44 |Q | | V | | 13+15 0.1731 0.45 |Q | | V | | 13+20 0.1762 0.46 |Q | | V | | 13+25 0.1794 0.46 |Q | | V | | 13+30 0.1825 0.46 |Q | | V | | 13+35 0.1856 0.44 |Q | | V | | 13+40 0.1881 0.37 |Q | | V | | 13+45 0.1904 0.33 |Q | | V | | 13+50 0.1926 0.32 |Q | | V | | 13+55 0.1948 0.32 |Q | | V | | 14+ 0 0.1970 0.31 |Q | | V | | 14+ 5 0.1992 0.32 |Q | | V | | 14+10 0.2015 0.35 |Q | | V | | 14+15 0.2040 0.36 |Q | | V| | 14+20 0.2065 0.36 |Q | | V| | 14+25 0.2089 0.36 |Q | | V| | 14+30 0.2114 0.35 |Q | | V | 14+35 0.2138 0.35 |Q | | V | 14+40 0.2162 0.35 |Q | | V | 14+45 0.2187 0.35 |Q | | |V | 14+50 0.2211 0.35 |Q | | |V | 14+55 0.2235 0.34 |Q | | |V | 15+ 0 0.2258 0.34 |Q | | | V | 15+ 5 0.2281 0.34 |Q | | | V | 15+10 0.2304 0.33 |Q | | | V | 15+15 0.2327 0.33 |Q | | | V | 15+20 0.2349 0.32 |Q | | | V | 15+25 0.2371 0.32 |Q | | | V | 15+30 0.2392 0.31 |Q | | | V | 15+35 0.2414 0.31 |Q | | | V | 15+40 0.2433 0.28 |Q | | | V | 15+45 0.2451 0.27 |Q | | | V | 15+50 0.2469 0.26 |Q | | | V | 15+55 0.2487 0.26 |Q | | | V | 16+ 0 0.2505 0.26 |Q | | | V | 16+ 5 0.2521 0.24 Q | | | V | 16+10 0.2530 0.13 Q | | | V | 16+15 0.2536 0.09 Q | | | V | 16+20 0.2540 0.07 Q | | | V | 16+25 0.2544 0.06 Q | | | V | 16+30 0.2548 0.06 Q | | | V | 16+35 0.2552 0.05 Q | | | V | 16+40 0.2555 0.05 Q | | | V | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 16+45 0.2558 0.04 Q | | | V | 16+50 0.2561 0.04 Q | | | V | 16+55 0.2564 0.04 Q | | | V | 17+ 0 0.2567 0.04 Q | | | V | 17+ 5 0.2570 0.04 Q | | | V | 17+10 0.2573 0.06 Q | | | V | 17+15 0.2578 0.06 Q | | | V | 17+20 0.2582 0.07 Q | | | V | 17+25 0.2587 0.07 Q | | | V | 17+30 0.2592 0.07 Q | | | V | 17+35 0.2596 0.07 Q | | | V | 17+40 0.2601 0.07 Q | | | V | 17+45 0.2606 0.07 Q | | | V | 17+50 0.2610 0.07 Q | | | V | 17+55 0.2614 0.06 Q | | | V | 18+ 0 0.2618 0.06 Q | | | V | 18+ 5 0.2622 0.06 Q | | | V | 18+10 0.2626 0.05 Q | | | V | 18+15 0.2630 0.05 Q | | | V | 18+20 0.2633 0.05 Q | | | V | 18+25 0.2637 0.05 Q | | | V | 18+30 0.2641 0.05 Q | | | V | 18+35 0.2644 0.05 Q | | | V | 18+40 0.2647 0.05 Q | | | V | 18+45 0.2650 0.04 Q | | | V | 18+50 0.2653 0.04 Q | | | V | 18+55 0.2655 0.03 Q | | | V | 19+ 0 0.2657 0.03 Q | | | V | 19+ 5 0.2659 0.03 Q | | | V | 19+10 0.2662 0.04 Q | | | V | 19+15 0.2665 0.04 Q | | | V | 19+20 0.2667 0.04 Q | | | V | 19+25 0.2671 0.05 Q | | | V | 19+30 0.2674 0.05 Q | | | V | 19+35 0.2678 0.05 Q | | | V | 19+40 0.2681 0.05 Q | | | V | 19+45 0.2684 0.04 Q | | | V | 19+50 0.2687 0.04 Q | | | V | 19+55 0.2689 0.03 Q | | | V | 20+ 0 0.2691 0.03 Q | | | V | 20+ 5 0.2693 0.03 Q | | | V | 20+10 0.2696 0.04 Q | | | V | 20+15 0.2698 0.04 Q | | | V | 20+20 0.2701 0.04 Q | | | V | 20+25 0.2704 0.04 Q | | | V | 20+30 0.2707 0.04 Q | | | V | 20+35 0.2709 0.04 Q | | | V | 20+40 0.2712 0.04 Q | | | V | 20+45 0.2715 0.04 Q | | | V | 20+50 0.2718 0.04 Q | | | V | 20+55 0.2720 0.03 Q | | | V | PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 21+ 0 0.2722 0.03 Q | | | V | 21+ 5 0.2724 0.03 Q | | | V | 21+10 0.2726 0.04 Q | | | V | 21+15 0.2729 0.04 Q | | | V | 21+20 0.2732 0.04 Q | | | V| 21+25 0.2734 0.03 Q | | | V| 21+30 0.2736 0.03 Q | | | V| 21+35 0.2738 0.03 Q | | | V| 21+40 0.2740 0.04 Q | | | V| 21+45 0.2743 0.04 Q | | | V| 21+50 0.2746 0.04 Q | | | V| 21+55 0.2748 0.03 Q | | | V| 22+ 0 0.2750 0.03 Q | | | V| 22+ 5 0.2752 0.03 Q | | | V| 22+10 0.2754 0.04 Q | | | V| 22+15 0.2757 0.04 Q | | | V| 22+20 0.2760 0.04 Q | | | V| 22+25 0.2762 0.03 Q | | | V| 22+30 0.2764 0.03 Q | | | V| 22+35 0.2766 0.03 Q | | | V| 22+40 0.2768 0.03 Q | | | V| 22+45 0.2770 0.03 Q | | | V| 22+50 0.2771 0.03 Q | | | V| 22+55 0.2773 0.03 Q | | | V| 23+ 0 0.2775 0.03 Q | | | V| 23+ 5 0.2777 0.03 Q | | | V| 23+10 0.2779 0.03 Q | | | V| 23+15 0.2781 0.03 Q | | | V| 23+20 0.2783 0.03 Q | | | V| 23+25 0.2784 0.03 Q | | | V| 23+30 0.2786 0.03 Q | | | V| 23+35 0.2788 0.03 Q | | | V| 23+40 0.2790 0.03 Q | | | V| 23+45 0.2792 0.03 Q | | | V| 23+50 0.2794 0.03 Q | | | V| 23+55 0.2796 0.03 Q | | | V| 24+ 0 0.2798 0.03 Q | | | V| 24+ 5 0.2799 0.02 Q | | | V| 24+10 0.2800 0.01 Q | | | V| 24+15 0.2800 0.00 Q | | | V| 24+20 0.2800 0.00 Q | | | V| 24+25 0.2800 0.00 Q | | | V| 24+30 0.2800 0.00 Q | | | V| 24+35 0.2800 0.00 Q | | | V| ----------------------------------------------------------------------- PR-2024-001701 (GPA, SPA, RZ, DR) Exhibit 13 - EIR Addendum and appedices 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 - 2018, Version 9.0 Study date 10/07/24 File: rchph1a1100.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------------------------------------------ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6443
--------------------------------------------------------------------- English (in-lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
--------------------------------------------------------------------- RCH Garage
DMA A
Kimley-Horn
100 yr
-------------------------------------------------------------------- Drainage Area = 1.91(Ac.) = 0.003 Sq. Mi.

Riverside City CouncilMay 20, 2025

Riverside City Council
May 20, 2025