HomeMy WebLinkAboutSDP 99-07; RANCHO LA COSTA VILLAGE; HYROLOGY HYDRAULIC ANALYSIS; 2001-03-12Civil Engineering/Surveying/Planning
STUART ENGINEERING
PEACE ENGINEERING, INC.,
A CALIFORNIA CORPORATION
7525 Metropolitan Drive, Suite 308
San Diego, California 92108
(619) 296-1010
FAX (619) 296-9276
stuart@inetworld.net
RANCHO LA COSTA VILLAGE
HYDROLOGY/HYDRAULIC ANAL YSIS
SDP 99-07
March 12, 2001
C:\121ds\cover.doc
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I Index
'I Page Number
I Narrative A
Hydrology 1-30
Inlet Capacity 31-35
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HYDROLOGYIHYDRAULIC ANALYSIS
FOR
RANCHO LA COSTA VILLAGE
INTRODUCTION: The project consists of the development of approximately 4.2 acres of undeveloped
site into a shopping center. The site currently slopes southeasterly away from the intersection of Rancho
Santa Fe Road and La Costa A venue, concentrating surface drainage in a concrete ditch located along the
southerly boundary and draining to an existing storm drain system constructed with the development of the
residential subdivision located southerly ofthe site. The site development proposes to direct and collect
surface drainage from roofs and parking lots, treat the initial flush with fossel filters and discharge the
drainage in a subsurface storm drain system, connected to the existing storm drain systen located at ~he
residential subdivision. Adequate capacity to accommodate the proposed site development was included in
the development of the down stream drainage system.
PROPOSED PROJECT: The site design proposes the concentration of surface drainage in small subbasins
of up to 0.27 acres at grated catch basins. The subbasin flows are transported through a storm drain system
of small diameter pipes (6" to 18" diameter) and discharges to the existing down stream storm drain.
Calculations are included to support catchbasin and inlet sizes. All site storm drains are sized to
accommodate the 100 event flow in an open channel flow condition.
See attached calculations verifying the calculated 100 year flows.
CONCLUSION: Site drainage is collected and discharged in an appropriate manner to the down stream
public storm drain.
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****************************************************************************
RATIONAL METHOD HYDROLOGY COMPUTER PROGRAM PACKAGE
Reference:
(c) Copyright
Ver. 1.5A
SAN DIEGO COUNTY FLOOD CONTROL DISTRICT
1985,1981 HYDROLOGY MANUAL
1982-99 Advanced Engineering Software (aes)
Release Date: 01/01/99 License ID 1305
FILE NAME: CA1031.DAT
TIME/DATE OF STUDY: 17:14 3/ 6/2001
USER SPECIFIED HYDROLOGY AND HYDRAULIC MODEL INFORMATION:
1985 SAN DIEGO MANUAL CRITERIA
USER SPECIFIED STORM EVENT(YEAR) = 100.00
6-HOUR DURATION PRECIPITATION (INCHES) = 3.100
SPECIFIED MINIMUM PIPE SIZE(INCH) = 6.00
SPECIFIED PERCENT OF GRADIENTS(DECIMAL) TO USE FOR FRICTION SLOPE
SPECIFIED CONSTANT RUNOFF COEFFICIENT = 0.950
NOTE: ONLY PEAK CONFLUENCE VALUES CONSIDERED
0.95
****************************************************************************
FLOW PROCESS FROM NODE 3.00 TO NODE 4.00 IS CODE = 22
»»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««<
============================================================================
*USER SPECIFIED (GLOBAL) :
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .9500
USER SPECIFIED Tc(MIN.) = 5.000
100 YEAR RAINFALL INTENSITY (INCH/HOUR) = 8.168
SUBAREA RUNOFF(CFS) 0.08
TOTAL AREA(ACRES) = 0.01 TOTAL RUNOFF (CFS) 0.08
****************************************************************************
FLOW PROCESS FROM NODE 4.00 TO NODE 5.00 IS CODE =
»»>COMPUTE PIPE FLOW TRAVELTIME THRU SUBAREA««<
»»>USING USER-SPECIFIED PIPESIZE««<
4
============================================================================
DEPTH OF FLOW IN 6.0 INCH PIPE IS 1.5 INCHES
PIPEFLOW VELOCITY(FEET/SEC.) = 2.0
UPSTREAM NODE ELEVATION = 292.00
DOWNSTREAM NODE ELEVATION = 291.50
FLOWLENGTH(FEET) = 48.00 MANNING'S N = 0.013
GIVEN PIPE DIAMETER (INCH) = 6.00 NUMBER OF PIPES 1
PIPEFLOW THRU SUBAREA (CFS) 0.08
TRAVEL TIME(MIN.) = 0.41 TC(MIN.) = 5.41
****************************************************************************
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FLOW PROCESS FROM NODE 5.00 TO NODE 5.00 IS CODE = 1
»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
============================================================================
TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE:
TIME OF CONCENTRATION(MIN.) 5.41
RAINFALL INTENSITY (INCH/HR) = 7.76
TOTAL STREAM AREA(ACRES) = 0.01
PEAK FLOW RATE(CFS) AT CONFLUENCE = 0.08
****************************************************************************
FLOW PROCESS FROM NODE 6.00 TO NODE 5.00 IS CODE = 22
»»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««<
============================================================================
*USER SPECIFIED (GLOBAL) :
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .9500
USER SPECIFIED Tc(MIN.) = 5.000
100 YEAR RAINFALL INTENSITY (INCH/HOUR) = 8.168
SUBAREA RUNOFF(CFS) 0.23
TOTAL AREA (ACRES) = 0.03 TOTAL RUNOFF (CFS) 0.23
****************************************************************************
FLOW PROCESS FROM NODE 5.00 TO NODE 5.00 IS CODE =
»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
»»>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES««<
1
======================================7=====================================
TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE:
TIME OF CONCENTRATION(MIN.) 5.00
RAINFALL INTENSITY (INCH/HR) = 8.17
TOTAL STREAM AREA(ACRES) = 0.03
PEAK FLOW RATE(CFS) AT CONFLUENCE = 0.23
** CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN. ) ( INCH/HOUR)
1 0.08 5.41 7.763
2 0.23 5.00 8.168
RAINFALL INTENSITY AND TIME OF CONCENTRATION
CONFLUENCE FORMULA USED FOR 2 STREAMS.
** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN. ) ( INCH/HOUR)
1 0.31 5.00 8.168
2 0.30 5.41 7.763
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLQWS:
PEAK FLOW RATE(CFS) 0.31 Tc (MIN.) =
TOTAL AREA(ACRES) = 0.04
AREA
(ACRE)
0.01
0.03
RATIO
5.00
2
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****************************************************************************
FLOW PROCESS FROM NODE 5.00 TO NODE 7.00 IS CODE =
»»>COMPUTE PIPE FLOW TRAVELTIME THRU SUBAREA««<
»»>USING USER-SPECIFIED PIPESIZE««<
4
============================================================================
DEPTH OF FLOW IN 6.0 INCH PIPE IS 3.1 INCHES
PIPEFLOW VELOCITY(FEET/SEC.) = 3.0
UPSTREAM NODE ELEVATION = 291.50
DOWNSTREAM NODE ELEVATION = 291.00
FLOWLENGTH(FEET) = 45.00 MANNING'S N = 0.013
GIVEN PIPE DIAMETER (INCH) = 6.00 NUMBER OF PIPES 1
PIPEFLOW THRU SUBAREA (CFS) 0.31
TRAVEL TIME(MIN.) = 0.25 TC(MIN.) = 5.25
****************************************************************************
FLOW PROCESS FROM NODE 7.00 TO NODE 7.00 IS CODE = 1
»»>DRSIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
============================================================================
TOTAL NUMBER OF STREAMS = 3
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE:
TIME OF CONCENTRATION(MIN.) 5.25
RAINFALL INTENSITY (INCH/HR) = 7.91
TOTAL STREAM AREA(ACRES) = 0.04
PEAK FLOW RATE(CFS) AT CONFLUENCE = 0.31
****************************************************************************
FLOW PROCESS FROM NODE 8.00 TO NODE 7.00 IS CODE = 22
»»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««<
================================~===========================================
*USER SPECIFIED (GLOBAL) :
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .9500
USER SPECIFIED Tc(MIN.) = 5.000
100 YEAR RAINFALL INTENSITY (INCH/HOUR) = 8.168
SUBAREA RUNOFF (CFS) 0.23
TOTAL AREA(ACRES) = 0.03 TOTAL RUNOFF (CFS) 0.23
****************************************************************************
FLOW PROCESS FROM NODE 7.00 TO NODE 7.00 IS CODE = 1
----------------------------------------------------------------------------
»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
===================================~========================================
TOTAL NUMBER OF STREAMS = 3
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE:
TIME OF CONCENTRATION(MIN.) 5.00
RAINFALL INTENSITY (INCH/HR) = 8.17
TOTAL STREAM AREA(ACRES) = 0.03
PEAK FLOW RATE (CFS) AT CONFLUENCE = 0.23
****************************************************************************
3
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FLOW PROCESS FROM NODE 1.00 TO NODE 2.00 IS CODE = 22
»»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««<
============================================================================
*USER SPECIFIED (GLOBAL) :
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .9500
USER SPECIFIED Tc(MIN.) = 5.000
100 YEAR RAINFALL INTENSITY (INCH/HOUR) = 8.168
SUBAREA RUNOFF(CFS) 3.10
TOTAL AREA (ACRES) = 0.40 TOTAL RUNOFF (CFS) 3.10
****************************************************************************
FLOW PROCESS FROM NODE 2.00 TO NODE 7.00 IS CODE =
»»>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA««<
»»>USING USER-SPECIFIED PIPESIZE««<
4
============================================================================
DEPTH OF FLOW IN 12.0 INCH PIPE IS 3.3 INCHES
PIPEFLOW VELOCITY(FEET/SEC.) = 17.4
UPSTREAM NODE ELEVATION = 297.00
DOWNSTREAM NODE ELEVATION = 291.10
FLOWLENGTH(FEET) = 21.00 MANNING'S N = 0.013
GIVEN PIPE DIAMETER (INCH) = 12.00 NUMBER OF PIPES 1
PIPEFLOW THRU SUBAREA (CFS) 3.10
TRAVEL TIME(MIN.) = 0.02 TC(MIN.) = 5.02
**********************************************************************~*****
FLOW PROCESS FROM NODE 7.00 TO NODE 7.00 IS CODE =
»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
»»>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES««<
1
============================================================================
TOTAL NUMBER OF STREAMS = 3
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 3 ARE:
TIME OF CONCENTRATION(MIN.) 5.02
RAINFALL INTENSITY (INCH/HR) = 8.15
TOTAL STREAM AREA(ACRES) = 0.40
PEAK FLOW RATE(CFS) AT CONFLUENCE = 3.10
** CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN. ) ( INCH/HOUR)
1 0.31 5.25 7.913
2 0.23 5.00 8.168
3 3.10 5.02 8.147
AREA
(ACRE)
0.04
0.03
0.40
RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO
CONFLUENCE FORMULA USED FOR 3 STREAMS.
** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN. ) ( INCH/HOUR)
1 3.63 5.00 8.168
2 3.63 5.02 8.147
3 3.55 5.25 7.913
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COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:
PEAK FLOW RATE (CFS) 3.63 Tc(MIN.) = 5.02
TOTAL AREA(ACRES) = 0.47
****************************************************************************
FLOW PROCESS FROM NODE 7.00 TO NODE 9.00 IS CODE =
»»>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA««<
»»>USING USER-SPECIFIED PIPESIZE««<
4
============================================================================
PIPEFLOW VELOCITY(FEET/SEC.) = 18.5
UPSTREAM NODE ELEVATION = 291.00
DOWNSTREAM NODE ELEVATION = 290.85
FLOWLENGTH(FEET) = 15.00 MANNING'S N = 0.013
GIVEN PIPE DIAMETER (INCH) = 6.00 NUMBER OF PIPES 1
PIPEFLOW THRU SUBAREA (CFS) 3.63
TRAVEL TIME(MIN.) = 0.01 TC(MIN.) = 5.03
*****************~**********************************************************
FLOW PROCESS FROM NODE 9.00 TO NODE 9.00 IS CODE = 1
»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
============================================================================
TOTAL NUMBER OF STREAMS = 3
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE:
TIME OF CONCENTRATION(MIN.) 5.03
RAINFALL INTENSITY (INCH/HR) = 8.13
TOTAL STREAM AREA(ACRES) = 0.47
PEAK FLOW RATE(CFS) AT CONFLUENCE = 3.63
****************************************************************************
FLOW PROCESS FROM NODE 10.00 TO NODE 9.00 IS CODE = 22
»»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««<
============================================================================
*USER SPECIFIED (GLOBAL) :
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .9500
USER SPECIFIED Tc(MIN.) = 5.000
100 YEAR RAINFALL INTENSITY (INCH/HOUR) = 8.168
SUBAREA RUNOFF (CFS) 1.47
TOTAL AREA(ACRES) = 0.19 TOTAL RUNOFF (CFS) 1.47
****************************************************************************
FLOW PROCESS FROM NODE 9.00 TO NODE 9.00 IS CODE = 1
»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
============================================================================
TOTAL NUMBER OF STREAMS = 3
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE:
TIME OF CONCENTRATION(MIN.) 5.00
RAINFALL INTENSITY (INCH/HR) 8.17
TOTAL STREAM AREA(ACRES) = 0.19
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PEAK FLOW RATE (CFS) AT CONFLUENCE 1. 47
****************************************************************************
FLOW PROCESS FROM NODE 11.00 TO NODE 9.00 IS CODE = 22
»»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««<
*USER SPECIFIED (GLOBAL) :
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .9500
USER SPECIFIED Tc(MIN.) = 5.000
100 YEAR RAINFALL INTENSITY (INCH/HOUR) = 8.168
SUBAREA RUNOFF(CFS) 0.08
TOTAL AREA(ACRES) = 0.01 TOTAL RUNOFF (CFS) 0.08
****************************************************************************
FLOW PROCESS FROM NODE 9.00 TO NODE 9.00 IS CODE.=
»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
»»>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES««<
1
============================================================================
TOTAL NUMBER OF STREAMS = 3
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 3 ARE:
TIME OF CONCENTRATION(MIN.) 5.00
.RAINFALL INTENSITY (INCH/HR) = 8.17
TOTAL STREAM AREA(ACRES) = 0.01
PEAK FLOW RATE(CFS) AT CONFLUENCE = 0.08
** CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN. ) ( INCH/HOUR)
1 3.63 5.03 8.133
2 1. 47 5.00 8.168
3 0.08 5.00 8.168
RAINFALL INTENSITY AND TIME OF CONCENTRATION
CONFLUENCE FORMULA USED FOR 3 STREAMS.
** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN. ) ( INCH/HOUR)
1 5.17 5.00 8.168
2 5.17 5.00 8.168
3 5.18 5.03 8.133
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:
PEAK FLOW RATE(CFS) 5.18 Tc (MIN.) =
TOTAL AREA(ACRES) = 0.67
AREA
(ACRE)
0.47
0.19
0.01
RATIO
5.03
****************************************************************************
FLOW PROCESS FROM NODE 9.00 TO NODE 12.00 IS CODE =
»»>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA««<
»»>USING USER-SPECIFIED PIPESIZE««<
4
============================================================================
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PIPEFLOW VELOCITY(FEET/SEC.) = 6.6
UPSTREAM NODE ELEVATION = 290.85
DOWNSTREAM NODE ELEVATION =
FLOWLENGTH(FEET) = 25.00
GIVEN PIPE DIAMETER (INCH) =
PIPEFLOW THRU SUBAREA (CFS)
TRAVEL TIME(MIN.) = 0.06
290.60
MANNING'S N = 0.013
12.00 NUMBER OF PIPES
5.18
TC(MIN.) = 5.10
1
****************************************************************************
FLOW PROCESS FROM NODE 12.00 TO NODE 12.00 IS CODE = 1
»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
============================================================================
TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE:
TIME OF CONCENTRATION(MIN.) 5.10
RAINFALL INTENSITY (INCH/HR) = 8.07
TOTAL STREAM AREA(ACRES) = 0.67
PEAK FLOW RATE (CFS) AT CONFLUENCE = 5.18
****************************************************************************
FLOW PROCESS FROM NODE 13.00 TO NODE 12.00 IS CODE = 22
»»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««<
============================================================================
*USER SPECIFIED (GLOBAL) :
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .9500
USER SPECIFIED Tc(MIN.) = 5.000
100 YEAR RAINFALL INTENSITY (INCH/HOUR) = 8.168
SUBAREA RUNOFF(CFS) 0.08
TOTAL AREA (ACRES) = 0.01 TOTAL RUNOFF(CFS) 0.08
****************************************************************************
FLOW PROCESS FROM NODE 12.00 TO NODE 12.00 IS CODE = 1 ----------------------------------------------------------------------~-------
»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
»»>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES««<
============================================================================
TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE:
TIME OF CONCENTRATION(MIN.) 5.00
RAINFALL INTENSITY (INCH/HR) = 8.17
TOTAL STREAM AREA(ACRES) = 0.01
PEAK FLOW RATE (CFS) AT CONFLUENCE = 0.08
** CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN. ) ( INCH/HOUR)
1 5.18 5.10 8. 067
2 0.08 5.00 8.168
RAINFALL INTENSITY AND TIME OF CONCENTRATION
CONFLUENCE FORMULA USED FOR 2 STREAMS.
AREA
(ACRE)
0.67
0.01
RATIO
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** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN.) (INCH/HOUR)
1 5.19 5.00 8.168
2 5.26 5.10 8.067
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:
PEAK FLOW RATE (CFS) 5.26 Tc(MIN.) = 5.10
TOTAL AREA (ACRES) = 0.68
***********k****************************************************************
FLOW PROCESS FROM NODE 12.00 TO NODE 14.00 IS CODE = 4
--------------------------------------------------------------------~-------
»»>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA««<
»»>USING USER-SPECIFIED PIPESIZE««<
============================================================================
PIPEFLOW VELOCITY(FEET/SEC.) = 6.7
UPSTREAM NODE ELEVATION = 290.60
DOWNSTREAM NODE ELEVATION = 289.50
FLOWLENGTH(FEET) = 100.00 MANNING'S N = 0.013
GIVEN PIPE DIAMETER (INCH) = 12.00 NUMBER OF PIPES 1
PIPEFLOW THRU SUBAREA (CFS) 5.26
TRAVEL TIME(MIN.) = 0.25 TC(MIN.) = 5.35
****************************************************************************
FLOW PROCESS FROM NODE 14.00 TO NODE 14.00 IS CODE =
»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE:
TIME OF CONCENTRATION(MIN.) 5.35
RAINFALL INTENSITY (INCH/HR) = 7.82
TOTAL STREAM AREA(ACRES) = 0.68
PEAK FLOW RATE (CFS) AT CONFLUENCE = 5.26
1
****************************************************************************
FLOW PROCESS FROM NODE 15.00 TO NODE 14.00 IS CODE = 22
»»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««<
*USER SPECIFIED (GLOBAL) :
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .9500
USER SPECIFIED Tc(MIN.) = 5.000
100 YEAR RAINFALL INTENSITY (INCH/HOUR) = 8.168
SUBAREA RUNOFF (CFS) 1.40
TOTAL AREA(ACRES) = 0.18 TOTAL RUNOFF (CFS) 1.40
********************************************************************.********
FLOW PROCESS FROM NODE 14.00 TO NODE i4.00 IS CODE =
»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
»»>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES««<
1
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============================================================================
TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE:
TIME OF CONCENTRATION(MIN.) 5.00
RAINFALL INTENSITY (INCH/HR) = 8.17
TOTAL STREAM AREA(ACRES) = 0.18
PEAK FLOW RATE(CFS) AT CONFLUENCE = 1.40
** CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN. ) ( INCH/HOUR)
1 5.26 5.35 7.823
2 1. 40 5.00 8.168
RAINFALL INTENSITY AND TIME OF CONCENTRATION
CONFLUENCE FORMULA USED FOR 2 STREAMS.
** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN. ) ( INCH/HOUR)
1 6.43 5.00 8.168
2 6.59 5.35 7.823
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:
PEAK FLOW RATE (CFS) 6.59 Tc(MIN.) =
TOTAL AREA(ACRES) = 0.86
AREA
(ACRE)
0.68
0.18
RATIO
5.35
****************************************************************************
F.LOW PROCESS FROM NODE 14.00 TO NODE 16.00 IS CODE =
»»>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA««<
»»>USING USER-SPECIFIED PIPESIZE««<
PIPEFLOW VELOCITY(FEET/SEC.) = 8.4
UPSTREAM NODE ELEVATION = 289.50
DOWNSTREAM NODE ELEVATION =
FLOWLENGTH(FEET) = 112.00
GIVEN PIPE DIAMETER (INCH) =
PIPEFLOW THRU SUBAREA (CFS)
TRAVEL TIME(MIN.) = 0.22
288.10
MANNING'S N = 0.013
12.00 NUMBER OF PIPES
6.59
TC(MIN.) = 5.57
4
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****************************************************************************
FLOW PROCESS FROM NODE 16.00 TO NODE 16.00 IS CODE = 10
»»>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 1 ««<
====================================~=======================================
****************************************************************************
FLOW PROCESS FROM NODE 42.00 TO NODE 43.00 IS CODE = 22
»»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««<
============================================================================
*USER SPECIFIED (GLOBAL) :
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .9500
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USER SPECIFIED Tc(MIN.) = 5.000
100 YEAR RAINFALL INTENSITY (INCH/HOUR) 8.168
SUBAREA RUNOFF (CFS) 1.16
TOTAL AREA(ACRES) = 0.15 TOTAL RUNOFF (CFS) 1.16
**************************************************************~*************
FLOW PROCESS FROM NODE 43.00 TO NODE 18.00 IS CODE =
»»>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA««<
»»>USING USER-SPECIFIED PIPESIZE««<
4
============================================================================
DEPTH OF FLOW IN 12.0 INCH PIPE IS 3.9 INCHES
PIPEFLOW VELOCITY(FEET/SEC.) = 5.2
UPSTREAM NODE ELEVATION = 292.50
DOWNSTREAM NODE ELEVATION = 290.90
FLOWLENGTH(FEET) = 76.00 MANNING'S N = 0.013
GIVEN PIPE DIAMETER (INCH) = 12.00 NUMBER OF PIPES 1
PIPEFLOW THRU SUBAREA (CFS) 1.16
TRAVEL TIME(MIN.) = 0.24 TC(MIN.) = 5.24
****************************************************************************
FLOW PROCESS FROM NODE 18.00 TO NODE 18.00 IS CODE = 1
»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
============================================================================
TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE:
TIME OF CONCENTRATION(MIN.) 5.24
RAINFALL INTENSITY (INCH/HR) = 7.92
TOTAL STREAM AREA(ACRES) = 0.15
PEAK FLOW RATE(CFS) AT CONFLUENCE = 1.16
****************************************************************************
FLOW PROCESS FROM NODE 17.00 TO 'NODE 18.00 IS CODE = 22
»»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««<
============================================================================
*USER SPECIFIED (GLOBAL) :
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .9500
USER SPECIFIED Tc(MIN.) = 5.000
100 YEAR RAINFALL INTENSITY (INCH/HOUR) = 8.168
SUBAREA RUNOFF(CFS) 1.16
TOTAL AREA (ACRES) = 0.15 TOTAL RUNOFF (CFS) 1.16
****************************************************************************
FLOW PROCESS FROM NODE 18.00 TO NODE 18.00 IS CODE =
»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
»»>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES««<
1
==================================================================~=========
TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE:
TIME OF CONCENTRATION(MIN.) = 5.00
10
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RAINFALL INTENSITY (INCH/HR) .= 8.17
TOTAL STREAM AREA (ACRES) = 0.15
PEAK FLOW RATE(CFS) AT CONFLUENCE = 1.16
** CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN. ) (INCH/HOUR) (ACRE)
1 1.16 5.24 7.922 0.15
2 1.16 5.00 8.168 0.15
RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO
CONFLUENCE FORMULA USED FOR 2 STREAMS.
** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN. ) ( INCH/HOUR)
1 2.29 5.00 8.168
2 2.29 5.24 7.922
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:
PEAK FLOW RATE(CFS) 2.29 Tc(MIN.) = 5.24
TOTAL AREA(ACRES) = 0.30
****************************************************************************
FLOW PROCESS FROM NODE 18.00 TO NODE 19.00 IS CODE =
»»>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA««<
»»>USING USER-SPECIFIED PIPESIZE««<
4
============================================================================
DEPTH OF FLOW IN 12.0 INCH PIPE IS 5.8 INCHES
PIPEFLOW VELOCITY(FEET/SEC.) = 6.1
UPSTREAM NODE ELEVATION = 290.90
DOWNSTREAM NODE ELEVATION = 289.45
FLOWLENGTH(FEET) = 74.00 MANNING'S N = 0.013
GIVEN PIPE DIAMETER (INCH) = 12.00 NUMBER OF PIPES
PIPEFLOW THRU SUBAREA (CFS) 2.29
TRAVEL TIME(MIN.) = 0.20 TC(MIN.) = 5.44
1
****************************************************************************
FLOW PROCESS FROM NODE 19.00 TO NODE 19.00 IS CODE = 10
»»>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 2 ««<
=========================================================================~==
****************************************************************************
FLOW PROCESS FROM NODE 20.00 TO NODE 21.00 IS CODE = 22
»»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««<
============================================================================
*USER SPECIFIED (GLOBAL) :
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .9500
USER SPECIFIED Tc(MIN.) = 5.000
100 YEAR RAINFALL INTENSITY (INCH/HOUR) 8.168
SUBAREA RUNOFF(CFS) = 2.10
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TOTAL AREA(ACRES) 0.27 TOTAL RUNOFF (CFS) 2.10
****************************************************************************
FLOW PROCESS FROM NODE 21.00 TO NODE 19.00 IS CODE =
»»>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA««<
»»>USING USER-SPECIFIED PIPESIZE««<
4
============================================================================
DEPTH OF FLOW IN 12.0 INCH PIPE IS 6.7 INCHES
PIPEFLOW VELOCITY(FEET/SEC.) = 4.6
UPSTREAM NODE ELEVATION = 289.90
DOWNSTREAM NODE ELEVATION = 289.45
FLOWLENGTH(FEET) = 45.00 MANNING'S N = 0.013
GIVEN PIPE DIAMETER (INCH) = 12.00 NUMBER OF PIPES
PIPEFLOW THRU SUBAREA (CFS) 2.10
TRAVEL TIME(MIN.) = 0.16 TC(MIN.) = 5.16
1
****************************************************************************
FLOW PROCESS FROM NODE 19.00 TO NODE 19.00 IS CODE = 1
»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
============================================================================
TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE:
TIME OF CONCENTRATION(MIN.) 5.16
RAINFALL INTENSITY (INCH/HR) = 8.00
TOTAL STREAM AREA(ACRES) = 0.27
PEAK FLOW RATE(CFS) AT CONFLUENCE = 2.10
****************************************************************************
FLOW PROCESS FROM NODE 22.00 TO NODE 19.00 IS CODE = 22
»»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««<
============================================================================
*USER SPECIFIED (GLOBAL) :
SINGLE FAMILY DEVELOPMENT RUNOFF COEFFICIENT = .9500
USER SPECIFIED Tc(MIN.) = 5.000
100 YEAR RAINFALL INTENSITY (INCH/HOUR) = 8.168
SUBAREA RUNOFF (CFS) 1.09
TOTAL AREA(ACRES) = 0.14 TOTAL RUNOFF (CFS) 1.09
***********************************************************-*****************
FLOW PROCESS FROM NODE 19.00 TO NODE 19.00 IS CODE =
»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
»»>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES««<
1
=====================================================================~======
TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE:
TIME OF CONCENTRATION(MIN.) 5.00
RAINFALL INTENSITY (INCH/HR) = 8.17
TOTAL STREAM AREA(ACRES) = 0.14
PEAK FLOW RATE(CFS) AT CONFLUENCE = 1.09
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** CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN. ) ( INCH/HOUR) (ACRE)
1 2.10 5.16 8.001 0.27
2 1. 09 5.00 8.168 0.14
RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO
CONFLUENCE FORMULA USED FOR 2 STREAMS.
** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN. ) ( INCH/HOUR)
1 3.14 5.00 8.168
2 3.16 5.16 8.001
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:
PEAK FLOW RATE (CFS) 3.16 Tc(MIN.) = 5.16
TOTAL AREA(ACRES) = 0.41
****************************************************************************
FLOW PROCESS FROM NODE 19.00 TO NODE 19.00 IS CODE = 11
»»>CONFLUENCE MEMORY BANK # 2 WITH THE MAIN-STREAM MEMORY««<
============================================================================
** MAIN
STREAM
NUMBER
1
STREAM CONFLUENCE DATA **
RUNOFF Tc INTENSITY
(CFS) (MIN.) (INCH/HOUR)
3.16 5.16 8.001
** MEMORY BANK # 2 CONFLUENCE DATA **
STREAM
NUMBER
1
** PEAK
STREAM
NUMBER
1
2
RUNOFF
(CFS)
2.29
FLOW RATE
RUNOFF
(CFS)
5.37
5.35
Tc INTENSITY
(MIN.) (INCH/HOUR)
5.44 7.731
TABLE **
Tc INTENSITY
(MIN. ) ( INCH/HOUR)
5.16 8.001
5.44 7.731
AREA
(ACRE)
0.41
AREA
(ACRE)
0.30
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:
PEAK FLOW RATE (CFS) 5.37 Tc(MIN.) = 5.16
TOTAL AREA(ACRES) 0.71
****************************************************************************
FLOW PROCESS FROM NODE 19.00 TO NODE 16.00 IS CODE =
»»>COMPUTE PIPE FLOW TRAVELTIME THRU SUBAREA««<
»»>USING USER-SPECIFIED PIPESIZE««<
DEPTH OF FLOW IN 18.0 INCH PIPE IS 9.2 INCHES
PIPEFLOW VELOCITY(FEET/SEC.) = 5.9
UPSTREAM NODE ELEVATION = 289.45
4
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DOWNSTREAM NODE ELEVATION =
FLOWLENGTH(FEET) = 134.00
GIVEN PIPE DIAMETER (INCH) =
PIPEFLOW THRU SUBAREA (CFS)
TRAVEL TIME(MIN.) = 0.38
288.10
MANNING'S N = 0.013
18.00 NUMBER OF PIPES
5.37
TC(MIN.) = 5.54
1
****************************************************************************
FLOW PROCESS FROM NODE 16.00 TO NODE 16.00 IS CODE = 11
»»>CONFLUENCE MEMORY BANK # 1 WITH THE MAIN-STREAM MEMORY««<
============================================================================
** MAIN STRE~ CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN. ) ( INCH/HOUR) (ACRE)
1 5.37 5.54 7.643 0.71
** MEMORY BANK # 1 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN. ) ( INCH/HOUR) (ACRE)
1 6.59 5.57 7.620 0.86
** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN. ) ( INCH/HOUR)
1 11.95 5.54 7.643
2 11. 95 5.57 7.620
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:
PEAK FLOW RATE(CFS) 11.95 Tc(MIN.) = 5.57
TOTAL AREA(ACRES) = 1.57
****************************************************************************
FLOW PROCESS FROM NODE 16.00 TO NODE 16.00 IS CODE = 12
»»>CLEAR MEMORY BANK # 2 ««<
============================================================================
****************************************************************************
FLOW PROCESS FROM NODE 16.00 TO NODE 16.00 IS CODE = 12
»»>CLEAR MEMORY BANK # 1 ««<
============================================================================
***********************************~****************************************
FLOW PROCESS FROM NODE 16.00 TO NODE 23.00 IS CODE =
»»>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA««<
»»>USING USER-SPECIFIED PIPESIZE««<
4
============================================================================
DEPTH OF FLOW IN 18.0 INCH PIPE IS 9.7 INCHES
PIPEFLOW VELOCITY(FEET/SEC.) = 12.4
UPSTREAM NODE ELEVATION = 288.10
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DOWNSTREAM NODE ELEVATION =
FLOWLENGTH(FEET) = 131.00
GIVEN PIPE DIAMETER (INCH) =
PIPEFLOW THRU SUBAREA (CFS)
TRAVEL TIME(MIN.) = 0.18
282.48
MANNING'S N = 0.013
18.00 NUMBER OF PIPES
11. 95
TC(MIN.) = 5.74
1
****************************************************************************
FLOW PROCESS FROM NODE 23.00 TO NODE 23.00 IS CODE = 1
»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
============================================================================
TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE:
TIME OF CONCENTRATION(MIN.) 5.74
RAINFALL INTENSITY (INCH/HR) = 7.47
TOTAL STREAM AREA(ACRES) = 1.57
PEAK FLOW RATE (CFS) AT CONFLUENCE = 11.95
****************************************************************************
FLOW PROCESS FROM NODE 24.00 TO NODE 23.00 IS CODE = 22
»»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««<
============================================================================
*USER SPECIFIED (GLOBAL) :
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .9500
USER SPECIFIED Tc(MIN.) = 5.000
100 YEAR RAINFALL INTENSITY (INCH/HOUR) = 8.168
SUBAREA RUNOFF(CFS) 1.63
TOTAL AREA (ACRES) = 0.21 TOTAL RUNOFF(CFS) 1. 63
****************************************************************************
FLOW PROCESS FROM NODE 23.00 TO NODE 23.00 IS CODE =
»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
»»>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES««<
1
============================================================================
TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE:
TIME OF CONCENTRATION(MIN.) 5.00
RAINFALL INTENSITY (INCH/HR) = 8.17
TOTAL STREAM AREA(ACRES) = 0.21
PEAK FLOW RATE(CFS) AT CONFLUENCE = 1.63
** CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN. ) ( INCH/HOUR)
1 11.95 5.74 7.468
2 1. 63 5.00 8.168
AREA
(ACRE)
1. 57
0.21
RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO
CONFLUENCE FORMULA USED FOR 2 STREAMS. I
** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
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NUMBER
1
2
(CFS)
12.56
13.44
(MIN. )
5.00
5.74
( INCH/HOUR)
8.168
7.468
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:
PEAK FLOW RATE(CFS) 13.44 Tc(MIN.) =
TOTAL AREA (ACRES) = 1.78
5.74
****************************************************************************
FLOW PROCESS FROM NODE 23.00 TO NODE 25.00 IS CODE =
»»>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA««<
»»>USING USER-SPECIFIED PIPESIZE««<
4
============================================================================
DEPTH OF FLOW IN 18.0 INCH PIPE IS 13.7 INCHES
PIPEFLOW VELOCITY(FEET/SEC.) = 9.3
UPSTREAM NODE ELEVATION = 282.48
DOWNSTREAM NODE ELEVATION =
FLOWLENGTH(FEET) = 63.00
GIVEN PIPE DIAMETER (INCH) =
PIPEFLOW THRU SUBAREA (CFS)
TRAVEL TIME(MIN.) = 0.11
281. 22
MANNING'S N = 0.013
18.00 NUMBER OF PIPES
13.44
TC(MIN.) = 5.86
1
****************************************************************************
FLOW PROCESS FROM NODE 25.00 TO NODE 25.00 IS CODE = 1
»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
============================================================================
TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE:
TIME OF CONCENTRATION(MIN.) 5.86
RAINFALL INTENSITY (INCH/HR) = 7.37
TOTAL STREAM AREA(ACRES) = 1.78
PEAK FLOW RATE(CFS) AT CONFLUENCE = 13.44
****************************************************************************
FLOW PROCESS FROM NODE 26.00 TO NODE 25.00 IS CODE = 22
»»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««<
============================================================================
*USER SPECIFIED (GLOBAL) :
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .9500
USER SPECIFIED Tc(MIN.) = 5.000
100 YEAR RAINFALL INTENSITY (INCH/HOUR) = 8.168
SUBAREA RUNOFF(CFS) 1.55
TOTAL AREA (ACRES) = 0.20 TOTAL RUNOFF (CFS) 1. 55
**********************************************************************'******
FLOW PROCESS FROM NODE 25.00 TO NODE 25.00 IS CODE =
»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
»»>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES««<
1
============================================================================
16
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TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM
TIME OF CONCENTRATION(MIN.) 5.00
RAINFALL INTENSITY (INCH/HR) = 8.17
TOTAL STREAM AREA(ACRES) = 0.20
PEAK FLOW RATE (CFS) AT CONFLUENCE = 1.55
** CONFLUENCE DATA **
STREAM RUNOFF
NUMBER (CFS )
1 13.44
2 1.55
Tc
(MIN. )
5.86
5.00
INTENSITY
( INCH/HOUR)
7.375
8.168
2 ARE:
AREA
(ACRE)
1. 78
0.20
RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO
CONFLUENCE FORMULA USED FOR 2 STREAMS.
** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN. ) ( INCH/HOUR)
1 13.69 5.00 8.168
2 14.84 5.86 7.375
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:
PEAK FLOW RATE(CFS) 14.84 Tc(MIN.) = 5.86
TOTAL AREA(ACRES) = 1.98
************************************************~****************-***********
FLOW PROCESS FROM NODE 25.00 TO NODE 27.00 IS CODE =
»»>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA««<
»»>USING USER-SPECIFIED PIPESIZE««<
DEPTH OF FLOW IN 18.0 INCH PIPE IS 5.6 INCHES
PIPEFLOW VELOCITY(FEET/SEC.) = 31.6
UPSTREAM NODE ELEVATION = 279.00
DOWNSTREAM NODE ELEVATION = 260.00
FLOWLENGTH(FEET) = 40.00 MANNING'S N = 0.013
GIVEN PIPE DIAMETER (INCH) = 18.00 NUMBER OF PIPES 1
PIPEFLOW THRU SUBAREA (CFS) 14.84
TRAVEL TIME(MIN.) = 0.02 TC(MIN.) = 5.88
4
****************************************************************************
FLOW PROCESS FROM NODE 27.00 TO NODE 28.00 IS CODE =
»»>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA««<
»»>USING USER-SPECIFIED PIPESIZE««<
4
============================================================================
DEPTH OF FLOW IN 18.0 INCH PIPE IS 7.5 INCHES
PIPEFLOW VELOCITY(FEET/SEC.) = 21.1
UPSTREAM NODE ELEVATION = 260.00
DOWNSTREAM NODE ELEVATION = 250.00
FLOWLENGTH(FEET) = 64.00 MANNING'S N = 0.013
GIVEN PIPE DIAMETER (INCH) = 18.00 NUMBER OF PIPES
PIPEFLOW THRU SUBAREA (CFS) 14.84
TRAVEL TIME(MIN.) = 0.05 TC(MIN.) = 5.93
1
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****************************************************************************
FLOW PROCESS FROM NODE 29.00 TO NODE 30.00 IS CODE = 22
»»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««<
*USER SPECIFIED (GLOBAL) :
COMMERCIAL DEVELOPMENT RUNOFF COE~FICIENT = .9500
USER SPECIFIED Tc(MIN.) = 5.000
100 YEAR RAINFALL INTENSITY (INCH/HOUR) = 8.168
SUBAREA RUNOFF(CFS) 1.24
TOTAL AREA(ACRES) = 0.16 TOTAL RUNOFF (CFS) 1. 24
****************************************************************************
FLOW PROCESS FROM NODE 31. 00 TO NODE 32.00 IS CODE = 22
»»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««<
============================================================================
*USER SPECIFIED (GLOBAL) :
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .9500
USER SPECIFIED Tc(MIN.) = 5.000
100 YEAR RAINFALL INTENSITY (INCH/HOUR) = 8.168
SUBAREA RUNOFF(CFS) 0.31
TOTAL AREA(ACRES) = 0.04 TOTAL RUNOFF(CFS) 0.31
****************************************************************************
FLOW PROCESS FROM NODE 32.00 TO NODE 33.00 IS CODE = 6
»»>COMPUTE STREETFLOW TRAVELTIME THRU SUBAREA««<
============================================================================
UPSTREAM ELEVATION = 293.90
STREET LENGTH (FEET) = 198.00
STREET HALFWIDTH(FEET) = 20.00
DOWNSTREAM ELEVATION = 291.60
CURB HEIGHT(INCHES) = 6.
DISTANCE FROM CROWN TO CROSS FALL GRADEBREAK 1. 00
INTERIOR STREET CROSSFALL(DECIMAL) 0.020
OUTSIDE STREET CROSS FALL (DECIMAL) 0.020
SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF 1
**TRAVELTIME COMPUTED USING MEAN FLOW(CFS) 1.49
STREETFLOW MODEL RESULTS:
STREET FLOWDEPTH(FEET) = 0.28
HALFSTREET FLOODWIDTH(FEET) = 7.57
AVERAGE FLOW VELOCITY(FEET/SEC.) 2.15
PRODUCT OF DEPTH&VELOCITY = 0.60
STREETFLOW TRAVELTIME (MIN) = 1.53 TC(MIN) = 6.53
100 YEAR RAINFALL INTENSITY (INCH/HOUR) = 6.874
*USER SPECIFIED (GLOBAL) :
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .9500
SUBAREA AREA(ACRES) = 0.36 SUBAREA RUNOFF(CFS)
SUMMED AREA(ACRES) = 0.40 TOTAL RUNOFF (CFS)
END OF SUBAREA STREETFLOW HYDRAULICS:
2.35
2.66
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DEPTH (FEET) = 0.32 HALFSTREET FLOODWIDTH(FEET) = 9.88
FLOW VELOCITY(FEET/SEC.) = 2.43 DEPTH*VELOCITY = 0.79
****************************************************************************
FLOW PROCESS FROM NODE 33.00 TO NODE 34.00 IS CODE =
»»>COMPUTE PIPE FLOW TRAVELTIME THRU SUBAREA««<
»»>USING USER-SPECIFIED PIPESIZE««<
DEPTH OF FLOW IN 12.0 INCH PIPE IS 6.6 INCHES
PIPEFLOW VELOCITY(FEET/SEC.) = 6.1
UPSTREAM NODE ELEVATION = 286.60
DOWNSTREAM NODE ELEVATION = 285.20
FLOWLENGTH(FEET) = 80.00 MANNING'S N = 0.013
GIVEN PIPE DIAMETER (INCH) = 12.00 NUMBER OF PIPES 1
PIPEFLOW THRU SUBAREA (CFS) 2.66
TRAVEL TIME(MIN.) = 0.22 TC(MIN.) = 6.75
4
****************************************************************************
FLOW PROCESS FROM NODE 34.00 TO NODE 34.00 IS CODE = 1
»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
============================================================================
TOTAL NUMBER OF STREAMS = 3
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE:
TIME OF CONCENTRATION(MIN.) 6.75
RAINFALL INTENSITY (INCH/HR) = 6.73
TOTAL STREAM AREA(ACRES) = 0.40
PEAK FLOW RATE(CFS) AT CONFLUENCE = 2.66
****************************************************************************
FLOW PROCESS FROM NODE 35.00 TO NODE 36.00 IS CODE = 22
»»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««<
===========================================================================~
*USER SPECIFIED (GLOBAL) :
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .9500
USER SPECIFIED Tc(MIN.) = 5.000
100 YEAR RAINFALL INTENSITY (INCH/HOUR) = 8.168
SUBAREA RUNOFF(CFS) 0.31
TOTAL AREA (ACRES) = 0.04 TOTAL RUNOFF(CFS) 0.31
****************************************************************************
FLOW PROCESS FROM NODE 36.00 TO NODE 34.00 IS CODE =
»»>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA««<
»»>USING USER-SPECIFIED PIPESIZE««<
4
============================================================================
DEPTH OF FLOW IN 12.0 INCH PIPE IS 2.4 INCHES
PIPEFLOW VELOCITY(FEET/SEC.) = 2.8
UPSTREAM NODE ELEVATION = 285.90
DOWNSTREAM NODE ELEVATION = 285.20
FLOWLENGTH(FEET) = 70.00 MANNING'S N 0.013
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GIVEN PIPE DIAMETER (INCH) =
PIPEFLOW THRU SUBAREA (CFS)
TRAVEL TIME(MIN.) = 0.42
12.00 NUMBER OF PIPES
0.31
TC(MIN.) = 5.42
1
****************************************************************************
FLOW PROCESS FROM NODE 34.00 TO NODE 34.00 IS CODE = 1
»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
============================================================================
TOTAL NUMBER OF STREAMS = 3
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE:
TIME OF CONCENTRATION(MIN.) 5.42
RAINFALL INTENSITY (INCH/HR) = 7.75
TOTAL STREAM AREA(ACRES) = 0.04
PEAK FLOW RATE(CFS) AT CONFLUENCE = 0.31
****************************************************************************
FLOW PROCESS FROM NODE 37.00 TO NODE 34.00 IS CODE = 22
»»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««<
*USER SPECIFIED (GLOBAL) :
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .9500
USER SPECIFIED Tc(MIN.) = 5.000
100 YEAR RAINFALL INTENSITY (INCH/HOUR) = 8.168
SUBAREA RUNOFF (CFS) 0.93 '
TOTAL AREA (ACRES) = 0.12 TOTAL RUNOFF (CFS) 0.93
****************************************************************************
FLOW PROCESS FROM NODE 34.00 TO NODE 34.00 IS CODE =
»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
»»>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES««<
1
============================================================================
TOTAL NUMBER OF STREAMS = 3
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 3 ARE:
TIME OF CONCENTRATION(MIN.) 5.00
RAINFALL INTENSITY (INCH/HR) = 8.17
TOTAL STREAM AREA(ACRES) = 0.12
PEAK FLOW RATE (CFS) AT CONFLUENCE = 0.93
** CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN. ) ( INCH/HOUR)
1 2.66 6.75 6.729
2 0.31 5.42 7.752
3 0.93 5.00 8.168
AREA
(ACRE)
0.40
0.04
0.12
RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO
CONFLUENCE FORMULA USED FOR 3 STREAMS.
** PEAK FLOW RATE TABLE **
STREAM RUNOFF
NUMBER (CFS)
Tc
(MIN. )
INTENSITY
( INCH/HOUR)
20
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1
2
3
3.42
3.50
3.70
5.00
5.42
6.75
8.168
7.752
6.729
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:
PEAK FLOW RATE(CFS) 3.70 Tc(MIN.) =
TOTAL AREA (ACRES) = 0.56
6.75
****************************************************************************
FLOW PROCESS FROM NODE 34.00 TO NODE 38.00 IS CODE =
»»>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA««<
»»>USING USER-SPECIFIED PIPESIZE««<
4
============================================================================
DEPTH OF FLOW IN 18.0 INCH PIPE IS 7.5 INCHES
PIPEFLOW VELOCITY(FEET/SEC.) = 5.3
UPSTREAM NODE ELEVATION = 285.20
DOWNSTREAM NODE ELEVATION = 284.07
FLOWLENGTH(FEET) = 114.00 MANNING'S N = 0.013
GIVEN PIPE DIAMETER (INCH) = 18.00 NUMBER OF PIPES
PIPEFLOW THRU SUBAREA (CFS) 3.70
TRAVEL TIME(MIN.) = 0.36 TC(MIN.) = 7.11
1
****************************************************************************
FLOW PROCESS FROM NODE 38.00 TO NODE 38.00 IS CODE = 10
»»>MAIN-STREAM MEMORY COPIED ONTO MEMORY BANK # 1 ««<
============================================================================
****************************************************************************
FLOW PROCESS FROM NODE 39.00 TO NODE 40.00 IS CODE = 22
»»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««<
============================================================================
*USER SPECIFIED (GLOBAL) :
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .9500
USER SPECIFIED Tc(MIN.) = 5.000
100 YEAR RAINFALL INTENSITY (INCH/HOUR) = 8.168
SUBAREA RUNOFF(CFS) 1.16
TOTAL AREA (ACRES) = 0.15 TOTAL RUNOFF (CFS) 1.16
****************************************************************************
FLOW PROCESS FROM NODE 40.00 TO NODE 41.00 IS CODE =
»»>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA««<
»»>USING USER-SPECIFIED PIPESIZE««<
4
============================================================================
DEPTH OF FLOW IN 12.0 INCH PIPE IS 3.3 INCHES
PIPEFLOW VELOCITY(FEET/SEC.) = 6.6
UPSTREAM NODE ELEVATION = 288.00
DOWNSTREAM NODE ELEVATION = 285.92
FLOWLENGTH(FEET) = 52.00 MANNING'S N = 0.013
GIVEN PIPE DIAMETER (INCH) = 12.00 NUMBER OF PIPES 1
21
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PIPEFLOW THRU SUBAREA (CFS)
TRAVEL TIME(MIN.) = 0.13
1.16
TC(MIN.) 5.13
****************************************************************************
FLOW PROCESS FROM NODE 41.00 TO NODE 41. 00 IS CODE =
»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE:
TIME OF CONCENTRATION(MIN.) 5.13
RAINFALL INTENSITY (INCH/HR) = 8.03
TOTAL STREAM AREA (ACRES) = 0.15
PEAK FLOW RATE (CFS) AT CONFLUENCE = 1.16
1
****************************************************************************
FLOW PROCESS FROM NODE 50.00 TO NODE 41.00 IS CODE = 22
»»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««<
============================================================================
*USER SPECIFIED (GLOBAL) :
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .9500
USER SPECIFIED Tc(MIN.) = 5.000
100 YEAR RAINFALL INTENSITY (INCH/HOUR) = 8.168
SUBAREA RUNOFF(CFS) 1.86
TOTAL AREA (ACRES) = 0.24 TOTAL RUNOFF(CFS) 1. 86
****************************************************************************
FLOW PROCESS FROM NODE 41.00 TO NODE 41. 00 IS CODE =
»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
»»>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES««<
1
============================================================================
TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE:
TIME OF CONCENTRATION(MIN.) 5.00
RAINFALL INTENSITY (INCH/HR) = 8.17
TOTAL STREAM AREA(ACRES) = 0.24
PEAK FLOW RATE (CFS) AT CONFLUENCE = 1.86
** CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN. ) ( INCH/HOUR)
1 1.16 5.13 8.032
2 1. 86 5.00 8.168
RAINFALL INTENSITY AND TIME OF CONCENTRATION
CONFLUENCE FORMULA USED FOR 2 STREAMS.
** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN. ) ( INCH/HOUR)
1 3.01 5.00 8.168
2 3.00 5.13 8.032
AREA
(ACRE)
0.15
0.24
RATIO
22
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COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:
PEAK FLOW RATE(CFS) 3.01 Tc(MIN.) = 5.00
TOTAL AREA(ACRES) = 0.39
****************************************************************************
FLOW PROCESS FROM NODE 41.00 TO NODE 38.00 IS CODE =
»»>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA««<
»»>USING USER-SPECIFIED PIPESIZE««<
4
============================================================================
DEPTH OF FLOW IN 12.0 INCH PIPE IS 5.1 INCHES
PIPEFLOW VELOCITY(FEET/SEC.) = 9.4
UPSTREAM NODE ELEVATION = 285.92
DOWNSTREAM NODE ELEVATION = 284.07
FLOWLENGTH(FEET) = 35.00 MANNING'S N = 0.013
GIVEN PIPE DIAMETER (INCH) = 12.00 NUMBER OF PIPES 1
PIPEFLOW THRU SUBAREA(CFS) 3.01
TRAVEL TIME(MIN.) = 0.06 TC(MIN.) = 5.06
****************************************************************************
FLOW PROCESS FROM NODE 38.00 TO NODE 38.00 IS CODE = 1
»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
============================================================================
TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE:
TIME OF CONCENTRATION(MIN.) 5.06
RAINFALL INTENSITY (INCH/HR) = 8.10
TOTAL STREAM AREA (ACRES) = 0.39
PEAK FLOW RATE (CFS) AT CONFLUENCE = 3.01
****************************************************************************
FLOW PROCESS FROM NODE 44.00 TO NODE 38.00 IS CODE = 22
»»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««<
============================================================================
*USER SPECIFIED (GLOBAL) :
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .9500
USER SPECIFIED Tc(MIN.) = 5.000
100 YEAR RAINFALL INTENSITY (INCH/HOUR) = 8.168
SUBAREA RUNOFF(CFS) 1.47
TOTAL AREA(ACRES) = 0.19 TOTAL RUNOFF(CFS) 1.47
****************************************************************************
FLOW PROCESS FROM NODE 38.00 TO NODE 38.00 IS CODE =
»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
»»>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES««<
1
============================================================================
TOTAL NUMBER OF STREAMS = 2
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE:
TIME OF CONCENTRATION(MIN.) = 5.00
23
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RAINFALL INTENSITY (INCH/HR) = 8.17
TOTAL STREAM AREA(ACRES) = 0.19
PEAK FLOW RATE (CFS) AT CONFLUENCE = 1. 47
** CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN. ) ( INCH/HOUR) (ACRE)
1 3.01 5.06 8.103 0.39
2 1. 47 5.00 8.168 0.19
RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO
CONFLUENCE FORMULA USED FOR 2 STREAMS.
** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN. ) ( INCH/HOUR)
1 4.46 5.00 8.168
2 4.47 5.06 8.103
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:
PEAK FLOW RATE(CFS) 4.47 Tc(MIN.) = 5.06
TOTAL AREA (ACRES) = 0.58
****************************************************************************
FLOW PROCESS FROM NODE 38.00 TO NODE 38.00 IS CODE = 11
»»>CONFLUENCE MEMORY BANK # 1 WITH THE MAIN-STREAM MEMORY««<
============================================================================
** MAIN STREAM CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN. ) ( INCH/HOUR) (ACRE)
1 4.47 5.06 8.103 0.58
** MEMORY BANK # 1 CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA , I
NUMBER (CFS) (MIN. ) ( INCH/HOUR) (ACRE)
1 3.70 7.11 6.508 0.56
** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN. ) ( INCH/HOUR)
1 7.44 5.06 8.103
2 7.29 7.11 6.508
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:
PEAK FLOW RATE (CFS) 7.44 Tc(MIN.) = 5.06
TOTAL AREA(ACRES) = 1.14
****************************************************************************
FLOW PROCESS FROM NODE 38.00 TO NODE 45.00 IS CODE =
»»>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA««<
»»>USING USER-SPECIFIED PIPESIZE««<
4
======================================================================~=====
24
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DEPTH OF FLOW IN 18.0 INCH PIPE IS 11.4 INCHES
PIPEFLOW VELOCITY(FEET/SEC.) = 6.3
UPSTREAM NODE ELEVATION = 284.07
DOWNSTREAM NODE ELEVATION =
FLOWLENGTH(FEET) = 67.00
GIVEN PIPE DIAMETER (INCH) =
PIPEFLOW THRU SUBAREA (CFS)
TRAVEL TIME(MIN.) = 0.18
283.40
MANNING'S N = 0.013
18.00 NUMBER OF PIPES
7.44
TC(MIN.) = 5.24
1
****************************************************************************
FLOW PROCESS FROM NODE 45.00 TO NODE 45.00 IS CODE = 1
»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
============================================================================
TOTAL NUMBER OF STREAMS = 3
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE:
TIME OF CONCENTRATION(MIN.) 5.24
RAINFALL INTENSITY (INCH/HR) = 7.93
TOTAL STREAM AREA (ACRES) = 1.14
PEAK FLOW RATE(CFS) AT CONFLUENCE = 7.44
****************************************************************************
FLOW PROCESS FROM NODE 46.00 TO NODE 45.00 IS CODE = 22
»»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««<
============================================================================
*USER SPECIFIED (GLOBAL) :
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .9500
USER SPECIFIED Tc(MIN.) = 5.000
100 YEAR RAINFALL INTENSITY (INCH/HOUR) = 8.168
SUBAREA RUNOFF (CFS) 0.78
TOTAL AREA(ACRES) = 0.10 TOTAL RUNOFF(CFS) 0.78
****************************************************************************
FLOW PROCESS FROM NODE 45.00 TO NODE 45.00 IS CODE = 1
»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
============================================================================
TOTAL NUMBER OF STREAMS = 3
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE:
TIME OF CONCENTRATION(MIN.) 5.00
RAINFALL INTENSITY (INCH/HR) = 8.17
TOTAL STREAM AREA(ACRES) = 0.10
PEAK FLOW RATE (CFS) AT CONFLUENCE = 0.78
****************************************************************************
FLOW PROCESS FROM NODE 47.00 TO NODE 45.00 IS CODE = 22
»»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««<
*USER SPECIFIED (GLOBAL) :
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .9500
USER SPECIFIED Tc(MIN.) = 5.000
25
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100 YEAR RAINFALL INTENSITY (INCH/HOUR) = 8.168
SUBAREA RUNOFF(CFS) 0.39
TOTAL AREA (ACRES) = 0.05 TOTAL RUNOFF (CFS) 0.39 ,
****************************************************************************
FLOW PROCESS FROM NODE 45.00 TO NODE 45.00 IS CODE =
»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««<
»»>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES««<
1
============================================================================
TOTAL NUMBER OF STREAMS = 3
CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 3 ARE:
TIME OF CONCENTRATION(MIN.) 5.00
RAINFALL INTENSITY (INCH/HR) = 8.17
TOTAL STREAM AREA(ACRES) = 0.05
PEAK FLOW RATE(CFS) AT CONFLUENCE = 0.39
** CONFLUENCE DATA **
STREAM RUNOFF Tc INTENSITY AREA
NUMBER (CFS) (MIN. ) ( INCH/HOUR) (ACRE)
1 7.44 5.24 7.926 1.14
2 0.78 5.00 8.168 0.10
3 0.39 5.00 8.168 0.05
RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO
CONFLUENCE FORMULA USED FOR 3 STREAMS.
** PEAK FLOW RATE TABLE **
STREAM RUNOFF Tc INTENSITY
NUMBER (CFS) (MIN. ) ( INCH/HOUR)
1 8.38 5.00 8.168
2 8.38 5.00 8.168
3 8.57 5.24 7.926
COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS:
PEAK FLOW RATE (CFS) 8.57 Tc (MIN.) = 5.24
TOTAL AREA(ACRES) = 1. 29
****************************************************************************
FLOW PROCESS FROM NODE 45.00 TO NODE 48.00 IS CODE =
»»>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA««<
»»>USING USER-SPECIFIED PIPESIZE««<
4
=========================================================================F==
DEPTH OF FLOW IN 18.0 INCH PIPE IS 4.7 INCHES
PIPEFLOW VELOCITY(FEET/SEC.) = 23.5
UPSTREAM NODE ELEVATION = 283.40
DOWNSTREAM NODE ELEVATION = 259.00
FLOWLENGTH(FEET) = 76.00 MANNING'S N = 0.013
GIVEN PIPE DIAMETER (INCH) = 18.00 NUMBER OF PIPES 1
PIPEFLOW THRU SUBAREA(CFS) 8.57
TRAVEL TIME(MIN.) = 0.05 TC(MIN.) = 5.29
****************************************************************************
26
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FLOW PROCESS FROM NODE 49.00 TO NODE 50.00 IS CODE = 22
»»>RATIONAL MET~OD INITIAL SUBAREA ANALYSIS««<
============================================================================
*USER SPECIFIED (GLOBAL) :
COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .9500
USER SPECIFIED Tc(MIN.) = 5.000
100 YEAR RAINFALL INTENSITY (INCH/HOUR) = 8.168
SUBAREA RUNOFF(CFS) = 0.70
TOTAL AREA (ACRES) = 0.09 TOTAL RUNOFF (CFS) 0.70
============================================================================
END OF STUDY SUMMARY:
PEAK FLOW RATE(CFS) =
TOTAL AREA(ACRES) =
0.70
0.09
Tc(MIN.) = 5.00
============================================================================
END OF RATIONAL METHOD ANALYSIS
1
27
- - - - -.. - - - - - - - - - - - - - -
. . . ~
'. INtENSITY~DURATION DESIGN CHART
. . _-
: IrrhnnllDb::s·i=I:ui:il~-mn"'''"l1l1iij!:4-i-:i·~i:.lli£G.( ~~U:Lin.bm ...
II. Equation: 1"'. 7.44 P 00
.-.
645
P. . I 6 U. : I
I\.
• 'I~ ... I • • 1.1. 1.0
I--+-t-.• -. ..-.-............. .. 11111 I I , , ,-... -.. -•. --~ .•.
111111
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10! 15 20
. ~ NimJtes
40 50 1 .. ._._ ... 2 30 3 4 ,5 6
• J . Hours i
... . ,. ., l
--_ . 198.4.
Directions for' Application:
1) From precipitation maps determine 6 hr. and
24 hr. amounts for .the selected frequency.
These maps are printed in the County Hydrology
Manual (10, 50 and 100 yr. maps included in the
Design and Procedure Manual).
2) Adjust 6 hr. precipitation (if necessary) so
that it is within the range of 451 to 65% Of
the 24 hr. precipitation. (Hot applicable
to Desert)
3) Plot 6 hr. precipitation on the right side
of the chart. .
4) Draw a line through the point parallel to the
plotted lines.
100 yr.
* P -%* --' 6 ----
P24
2) Adjusted *P6= in.
3) tc ~ min.
4) I· in/hr.
*Not Applicable to Desert Region
This chart replaces the !ritensity-
Duration-Frequency curves used since 1965. .
Tn ....
~.
n'
:--I
~.
-------------~-----
.~
-.J)
.... .... 1 l> 1
"
COUflTY OF SAN DIEGO
DEPARTMENT OF SANITATION &
FLOOD CONTROL
lOO-YEAR 6-UOUR
330
45 1
!
3011 1 .,,,, 1\ JI-'
I
I 15 I I L,J~) / r I 4 \ 7 7 !-
45 1 ~.-~ r~v'''V'' I i -----'rttn JIii I Ii Y"'f.
Prepn 4<>d. by
U.S. DEPARTMENfl' OF COMMERCE
NATIONAL OCEANIC AND AT10SPIIERIC ADMINISTRATION
SPECIAL STUDIES BRANCH, OFFICE OF 11 I>ROLOGY, NATIONAL WEATHER SERVICE
30 1 ~ I . ~I-I ---1--
1181 45 1 30' lS' 1170 l~5 I 30' 151 1160
- - - - - - - - ---.------ - -
COUNTY OF SAN DIEGO
DEPARTMENT OF SANITATION &
FLOOD CONTROL 100-YE/Hl 24-~lm,n rrlECIPITATION
"--20../ ISOPlUVIAlS Of 100 -YEAR 24-UOUn
LtS'
30'
IS'
"l,:--
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,Pr~I'''~'<I by
u.s. DEPARTMENlr O}t~ COMMERCE
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INSPECTOR DATE
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