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HomeMy WebLinkAboutHydrology Study I I I I I I I I I I I '. I I I .' I I I < PM 29162 HYDROLOGY STUDY Prepared For: NO. 50 Associates May 2, 2001 RECEIVED /: MAY 0 7 2001 Prepared By: CITY OF TEMECULA . ENGINEERING DEPARTMENT ,. .~. HLC CIVIL ENGINEERING 43533 Ridge Park Drive, Ste. B Temecula, CA 92590 (909) 506-4869 (909) 506-4979 Fax By: H'.~~~RCE 3~~~O\ RCE STAMP-Expires 6/30/04 \ I I I I I 'I I I I I I ,. I I I I I I 'I TABLE OF CONTENTS SUBJECT SECTION DRAINAGE STUDY REPORT 100 YEAR HYDROLOGY 10 YEAR HYDROLOGY HYDROLOGY EXHIBIT MAP OFF-SITE HYDROLOGY EXHIBIT MAP 1 2 5 EXHIBIT "A" EXHIBIT "B" -v I I I I I I I I I I I I I. I I :1 I , I J ~ INTRODUCTION SECTION 1- 1 STUDY AREA Parcel Map 29162 property was initially a part of the Assessment District No. 155 (AD 155) Master Drainage Area Plan. AD 155 outlined a network of proposed storm drain improvement needed to protect development from flooding during the 100-year storm event Existing storm drain improvement constructed for PM28657 were designed to collect the proposed storm runoff from this project See Exhibit "A" for drainage boundary and estimated 10/1 OO-year storm runoffs. '" SEe. 1-1 'b I I I, I I I I I 1 I I I , I I 'I .' I I I~ lOO-YEAR STORM SECTION 2- 1 ============================================================================ RATIONAL METHOD HYDROLOGY COMPUTER PROGRAM BASED ON RIVERSIDE COUNTY FLOOD CONTROL & WATER CONSERVATION DISTRICT (RCFC&WCD) 1978 HYDROLOGY MANUAL ---------------------------------------------------------------------------- ---------------------------------------------------------------------------- <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> (C) Copyright 1982,1986 Advanced Engineering Software [AES] Especially prepared for: NBS/LOWERY ENGINEERS & PLANNERS <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> **********DESCRIPTION OF * PM29l62 DRAINAGE STUDY * MAY 2, 2001 ... BY HLC RESULTS******************************************** * * **************************************************************************** ---------------------------------------------------------------------------- USER SPECIFIED HYDROLOGY AND HYDRAULIC MODEL INFORMATION: ---------------------------------------------------------------------------- USER SPECIFIED STORM EVENT (YEAR) = 100.00 SPECIFIED MINIMUM PIPE SIZE(INCH) = 18.00 SPECIFIED PERCENT OF GRADIENTS(DECIMAL) TO USE FOR FRICTION SLOPE .90 10-YEAR STORM 10-MINUTE INTENSITY (INCH/HOUR) = 2.360 lO-YEAR STORM GO-MINUTE INTENSITY (INCH/HOUR) = .880 100-YEAR STORM 10-HINUTE INTENSITY(INCH!HOUR) 3.480 laO-YEAR STO~1 60-MINUTE INTENSITY (INCH/HOUR) 1.300 SLOPE OF la-YEAR INTENSITY-DURATION CURVE = .5505732 SLOPE OF 100-YEAR INTENSITY-DURATION CURVE = .5495536 COMPUTED RAINFALL INTENSITY DATA: STORM EVENT = 100.00 I-HOUR INTENSITY (INCH!HOUR) = 1.3000 SLOPE OF INTENSITY DURATION CURVE = .5496 RCFC&WCD HYDROLOGY MANUAL "Cn-VALUES USED <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Advanced Engineering Software [AESJ SERIAL No. 100971 VER. 3.3C RELEASE DATE: 2/20/86 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> ****~*********************************************************************** FLOW PROCESS FROM NODE 403.30 TO NODE 403.20 IS CODE = 2 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< -----~------~~-------------------~---------------------------------------~-- ---------~-------~------------------------------~---------~----------~------ ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS: UNDEVELOPED WITH GOOD COVER TC = K* [(LENGTH**3l! (ELEVATION CHANGE)]**.2 INITIAL SUBAREA FLOW-LENGTH = 1000.00 UPSTRENq ELEVATION = 1805.00 DOWNSTREAM ELEVATION = 1350.00 ELEVATION DIFFERENCE = 455.00 TC = .937*f( 1000.00*~3)/' 455.00)J**.2 100.00 YEAR RAINFALL INTENSITY (INCH/HOURl SOIL CLASSIFICATION IS "D" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .7672 SUBAREA RUNOFF(CFS) 11.03 TOTAL AREA(ACRES) = 5.60 17.391 2.567 11.03 TOTAL RUNOFF(CFS) **********************y*++***************************************+****+***** FLOW PROCESS FROM NODE 403.30 TO NODE 403.20 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< SEe. 2-1 A., I~ I I I I I I I, I I, I II I I I I I I I 100-YEAR STORM SECTION 2- 2 ~=========================================================================== CONFLUENCE VALUES USED FOR INDEPENDENT STREA~ 1 ARE: TIME OF CONCENTRATION (MINUTES) = 17.39 RAINFALL INTENSITY (INCH./HOUR) = 2.57 TOTAL STREAM AREA (ACRES) = 5.60 TOTAL STREAM RUNOFF(CFSj AT CONFLUENCE = 11.03 **************************************************************************** FLOW PROCESS FROM NODE 403.40 TO NODE 403.20 IS CODE = ? --------------------------------------------------------~------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA N~ALYSIS<<<<< -------------------------------~-------------------------------------------- ----------~~-----------------------------~------------------------------~--- ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS: UNDEVELOPED WITH GOOD COVER TC ~ K*[(LENGTH**3l/(ELEVATION CHANGE)]**.2 INITIAL SUBAREA FLOW-LENGTH ~ 1000.00 UPSTREAM ELEVATION ~ 1825.00 DOWNSTREAM ELEVATION = 1350.00 ELEVATION DIFFERENCE ~ 475.00 TC = .937*[' 1000.00**3)/( 475.00)J**.2 17.242 100.00 YEAR RAINFALL INTENSITY (INCH/HOURl 2.580 SOIL CLASSIFICATION IS "0" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT ~ .7677 SUBAREA RUNOFF(CFS) 17.43 TOTAL AREA(ACRES) ~ 8.80 TOTAL RUNOFF{CFS) 17.43 **************************************************************************** FLOW PROCESS FROM NODE 403.40 TO NODE 403.20 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< >>>>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<<<<< ~===========~===============-=======--=================================---== CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE: TIME OF CONCENTRATION(MINUTES) = 17.24 RAINFALL INTENSITY (INCH./HOUR) = 2.58 TOTAL STREAM AREA (ACRES) = 8.80 TOTAL STREAM RUNOFF(CFS) AT CONFLUENCE = 17.43 CONFLUENCE INFORMATION: STREAM RUNOFF TIME NUMBER (CFS) (MIN.) INTENSITY (INCH/HOUR) ---------------------------------------------------------------------------- 1 2 11. 03 17.43 17.39 17.24 2.567 2.580 RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO FORMULA (RCfC&WCD) USED FOR 2 STREAMS. VARIOUS CONFLUENCED RUNOFf VALUES ARE AS FOLLOWS: 28.38 28.36 COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS: RUNOFF(CFS) = 28.38 TIME (MINUTES) 17.39:' TOTAL AREAIACRES) = 14.40 **************************************************************************** FLOW PROCESS FROM NODE 403.20 TO NODE 403.10 IS CODE = 5 ---------------------------------------------------------------------------- >>>>>COMPUTE TRAPEZOIDAL-CHANNEL FLOW<<<<< >>>>>TRAVELTIME THRU SUBAREA<<<<< =====~====================================================================== UPSTREAM NODE ELEVATION = 1350.00 DOWNSTREAM NODE ELEVATION = 1220.00 CHANNEL LENGTH THRU SUBAREA/FEET) = 900.00 CHANNEL BASE (FEET) = 25.00 "Z" FACTOR = 4.000 MANNINGS FACTOR = .040 MAXIMUM DEPTH (FEET) 4.00 CHANNEL FLOW THRU SUBAREA (CFS) = 28.38 fLOW VELOCITY (FEET/SECj = 4.67 FLOW DEPTH(FEET) .23 TRAVEL TIME(MIN.) = 3.21 TC(MIN.l = 20.60 **************************************************************************** FLOW PROCESS fROM NODE 403.20 TO NODE 403.10 IS CODE = 8 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<< ,/ ~ SEe. 2-2 I I I I I I I I I II I I I I I I I Ii I 100-YEAR STORM SECTION 2- 3 ---------~------------------------------------------------------------------ ---------------------------------------------------------------------------- 100.00 YEAR AAINFALL INTENSITY (INCHJHOURJ 2.339 SOIL CLASSIFICATION IS "0" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .7563 SUBAREA AREA{ACRES) 13.60 SUBAREA RUNOFF(CFS) TOTAL AREA (ACRES) 28.00 TOTAL RUNOFF(CFS) = TC(MINl = 20.60 24.06 52.44 **************************************************************************** FLOW PROCESS FROM NODE 403.10 TO NODE 404.10 IS CODE = 3 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE FLOW TRAVELTIME THRU SUBAREA<<<<< >>>>>USING COMPUTER-ESTIMATED PIPESIZE (NON-PRESSURE FLOW)<<<<< ~========~===============~======================================~======~==== DEPTH OF FLOW IN 21.0 INCH PIPE IS 17.1 INCHES PIPEFLOW VELOCITY(FEET/SEC.) = 25.0 UPSTREAM NODE ELEVATION = 1220.00 DOWNSTREAM NODE ELEVATION = 1140.00 FLOWLENGTH(FEETl = 650.00 MANNINGS N .013 ESTIMATED PIPE DIAMETER (INCH) 21.00 NUMBER OF PIPES 1 PIPEFLOW THRU SUBAREA(CFS) 52.44 TRAVEL TIME(MIN.) = .43 TC(MIN.) 21.04 **************************************************************************** FLOW PROCESS FROM NODE 403.10 TO NODE 404.10 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< ~=========~=~===============~=================~============================= CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE: TIME OF CONCENTRATION(MINUTES) = 21.04 RAINFALL INTENSITY (INCH./HOUR) = 2.31 TOTAL STREAM AREA (ACRES) = 28.00 TOTAL STREAM RUNOFF (CFSl AT CONFLUENCE =" 52.44 **************************************************************************** FLOW PROCESS FROM NODE 400.00 TO NODE 401.00 IS CODE = 2 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< ============~=============================================~================= ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS: UNDEVELOPED WTTH GOOD COVER TC ~ K*! (LENGTH**31/(ELEVATION CHANGE)]**.2 INITIAL SUBAREA FLOW-LENGTH = 700.00 UPSTREAM ELEVATION = 1595.00 DOWNSTREAM ELEVATION ~ 1260.00 ELEVATION DIFFERENCE = 335.00 TC = .937*[( 700.00**3)/( 335.00)]**.2 100.00 YEAR RAINFALL INTENSITY (INCH/HOURl SOIL CLASSIFICATION IS "D" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .7764 SUBAREA RUNOFFICFSI 11.71 TOTAL AREA (ACRES) = 5.40 14.927 2.792 11.71 TOTAL RUNOFF(CFS) **************************************************************************** FLOW PROCESS FROM NODE 401. 00 TO NODE 403.00 IS CODE = 5 ---------------------------------------------------------------------------- >>>>>COMPUTE TRAPEZOIDAL-CHANNEL FLOW<<<<< >>>>>TRAVELTIME THRU SUBAREA<<<<< =~=========================~============================================~=== UPSTREAM NODE ELEVATION = 1260.00 DOWNSTREAM NODE ELEVATION = 1155.00 CHANNEL LENGTH THRU SUBAREA (FEET) = 850.00 CHANNEL BASE(FEET) = 25.00 "z" FACTOR = MANNINGS FACTOR = .040 MAXIMUM DEPTH(FEET) CHANNEL FLOW THRU SUBAREA(CFS) = 11.71 FLOW VELOCITY (FEET/SECl = 3.35 FLOW DEPTH{FEET} TRAVEL TIME(MIN.) = 4.23 TC{MIN.) = 19.15 4.000 5.00 .14 **************************************************************************** FLOW PROCESS FROM NODE 401.00 TO NODE 403.00 IS CODE = 8 ---------------------------------------------------------------------------- SEC. 2-3 (p II I I I I I I II I il ,I I I I I I I I I lOO-YEAR STORM SECTION 2- 4 >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<< ------~-------~------------------------------------------------------------- ---------------------------------------------------------~------------------ 100.00 YEAR RAINFALL INTENSITY (INCH/HOUR) 2.435 SOIL CLASSIFICATION IS "C" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .7223 SUBAREA AREA(ACRES) 4.30 SUBAREA RUNOFF{CFS) 7.56 TOTAL AREA (ACRES) 9.70 TOTAL RUNOFF{CFS) = 19.27 TC(MIN) = 19.15 ~***************************************************~*********************** FLOW PROCESS FROM NODE 403.00 TO NODE 404.10 IS CODE = 3 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE FLOW TRAVELTIME THRU SUBAREA<<<<< >>>>>USING COMPUTER-ESTIMATED PIPESIZE (NON-PRESSURE FLOWj<<<<< ----------------------------------------------~---------~--------------~---- ------------~------------------------------------------------~-----~------~- DEPTH OF FLOW IN 18.0 INCH PIPE IS 11.1 INCHES PIPEFLOW VELOCITY(FEET/SEC.) = 16.9 UPSTREAM NODE ELEVATION = 1190.00 DOWNSTREAM NODE ELEVATION = 1140.00 FLOWLENGTH (FEET) = 650.00 MANNINGS N .013 ESTIMATED PIPE DIAMETER (INCH) 18.00 NUMBER OF PIPES 1 PIPEFLOW THRU SUBAREA (CFS) 19.27 TRAVEL TIME (MIN.) = .64 TC (MIN. ) 19.19 **************************************************************************** FLOW PROCESS FROM NODE 403.00 TO NODE 404.10 IS CODE = 5 ---------------------------------------------------------------------------- >>>>>COMPUTE TRAPEZOIDAL-CHANNEL FLOW<<<<< >>>>>TRAVELTIME THRU SUBAREA<<<<< ============================================================================ UPSTREAM NODE ELEVATION = 1155.00 DOWNSTREAM NODE ELEVATION = 1140.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 240.00 CHANNEL BASE(FEET) = 25.00 "z" FACTOR = 4.000 MANNINGS FACTOR = .040 MAXIMUM DEPTH(FEET) 5.00 CHANNEL FLOW THRU SUBAREA(CFS} = 19.21 FLOW VELOCITY (FEET/SEC) = 3.41 FLOW DEPTH(FEET) .21 TRAVEL TIME(MIN.) = 1.15 TC(MIN.) = 20.95 **************************************************************************** FLOW PROCESS FROM NODE 403.00 TO NODE 404.10 IS CODE = 8 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<< ============================================================================ 100.00 YEAR RAINFALL INTENSITY(INCH/HOUR} = 2.318 SOIL CLASSIFICATION IS "C" COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8815 SUBAREA AREA (ACRES) 4.80 SUBAREA RUNOFF(CFS) 9.81 TOTAL AREA(ACRES) 14.50 TOTAL RUNOFF(CFS} = 29.08 TC(MIN) = 20.95 **************************************************************************** FLOW PROCESS FROM NODE 403.00 TO NODE 404.10 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< >>>>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<<<<< ============================================================================ CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE: TIME OF CONCENTRATION(MINUTES) = 20.95 RAINFALL INTENSITY (INCH./HOUR) = 2.32 TOTAL STREAM AREA (ACRES) = 14.50 TOTAL STREAM RUNOFF{CFS) AT CONFLUENCE = 29.08 CONFLUENCE INFORMATION: STREAM RUNOFF TIME NUMBER (CFS) (MIN.) INTENSITY (INCH/HOUR) ---------------------------------------------------------------------------- 1 2 52.44 29.08 21. 04 20.95 2.312 2.318 RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO FORMULA (RCFC&WCD) USED FOR 2 STREAMS. SEC. 2-4 \. I' I I I I I I I I .1 I I I I I I I I I 100-YEAR STORM SECTION 2- 5 VARIOUS CONFLUENCED RUNOFF VALUES ARE AS FOLLOWS: 81.44 81.29 COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS: RUNOFF(CFS) = 81.44 TIME (MINUTES) 21.038 TOTAL AREA{ACRES) = 42.50 **************************************************************************** FLOW PROCESS FROM NODE 404.10 TO NODE 405.00 IS CODE = 3 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA<<<<< >>>>>USING COMPUTER-ESTIMATED PIPESIZE (NON-PRESSURE FLOW)<<<<< ---------------------------------------------------------------------------- ---------------------------------------------------------------------------- DEPTH OF FLOW IN 27.0 INCH PIPE IS 19.0 INCHES PIPEFLOW VELOCITY {FEET/SEC. ) = 27.2 UPSTREAM NODE ELEVATION = 1140.00 DOWNSTREAM NODE ELEVATION = 1086.00 FLOWLENGTH(FEET) = 500.00 MANNINGS N .013 ESTIMATED PIPE DIAMETER (INCH) 27.00 NUMBER OF PIPES 1 PIPEFLOW THRU SUBAREA(CrS) 81.44 TRAVEL TIME (MIN.) = .31 TC (MIN. ) 21.34 **************************************************************************** FLOW PROCESS FROM NODE 404.10 TO NODE 405.00 IS CODE = 8 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<< ---~----------------------~------------------------------------------------- ------~-------------~------------------------------------------------------- 100.00 YEAR RAINFALL INTENSITY (INCH/HOUR) = SOIL CLASSIFICATION IS "B" COMMERCIAL DEVELOPMENT RUNOFF SUBAREA AREA{ACRES) 11.30 TOTAL AREA(ACRES) 53.80 TC(MIN) = 21.34 2.294 COEFFICIENT = .8718 SUBAREA RUNOFF{CFS) 22.60 TOTAL RUNOFF(CfS) = 104.04 **************************************************************************** FLOW PROCESS FROM NODE 405.00 TO NODE 406.00 IS CODE = 3 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPEfLOW TRAVELTIME THRU SUBAREA<<<<< >>>>>USING COMPUTER-ESTIMATED PIPESIZE (NON-PRESSURE FLOW)<<<<< ---------------------------------------------------------------------------- -----------------------------------------------------------------~---------- DEPTH OF FLOW IN 39.0 INCH PIPE IS 28.8 INCHES PIPEFLOW VELOCITY (FEET/SEC. ) = 15.8 UPSTREAM NODE ELEVATION = 1086.00 DOWNSTREAM NODE ELEVATION = 1075.00 FLOWLENGTH(FEET) = 500.00 MANNINGS N .013 ESTIMATED PIPE DIAMETER (INCH) 39.00 NUMBER OF PIPES 1 PIPEFLOW THRU SUBAREA (CFS) 104.04 TRAVEL TIME (MIN.) = .53 TC (MIN. ) 21. 87 **************************************************************************** FLOW PROCESS FROM NODE 405.00 TO NODE 406.00 IS CODE; 8 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<< ---------------------~------------------------------------------------------ ---------------------------------------------------------------------------- 100.00 YEAR RAINFALL INTENS~TY(INCH/HOUR) = SOIL CLASSIFICATION IS "B" COMMERCIAL DEVELOPMENT RUNOFF SUBAREA AREA(ACRESl 8.10 TOTAL AREA(ACRES) 61.90 TC(MIN) ~ 21.87 2.264 COEFFICIENT = .8715 SUBAREA RUNOFF(CFS} 15.98 TOTAL RUNOFF(CFS) = 120.02 **************************************************************************** FLOW PROCESS FROM NODE 405.00 TO NODE 406.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< ---------------------------------------------------------------------------- ---------------------------------------------------------------------------- CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE: TIME OF CONCENTRATION/MINUTES) = 21.87 RAINFALL INTENSITY (INCH./HOURl = 2.26 TOTAL STREAM AREA (ACRES) = 61.90 TOTAL STREAM RUNOFF{CFS) AT CONFLUENCE = 120.02 SEC. 2-5 ~ I I I I I I I I I I II I I I I I I I I 100- YEAR STORM SECTION 2- 6 **************************************************************************** FLOW PROCESS FROM NODE 409.00 TO NODE 406.00 IS CODE = 2 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< ---------------------------------------------------------------------------- ---------------------------------------------------------------------------- ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS COMMERCIAL TC = K*[(LENGTH**3)/(ELEVATION CHANGE}]**.2 INITIAL SUBAREA FLOW-LENGTH = 100.00 UPSTREAM ELEVATION = 1082.00 DOWNSTREAM ELEVATION = 1075.00 ELEVATION DIFFERENCE = 7.00 TC = .303*[( 700.00**3)/( 7.001J**.2 10.462 100.00 YEAR RAINFALL INTENSITY (INCH!HOUR) 3.395 SOIL CLASSIFICATION IS "8" COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8788 SUBAREA RUNOFF(CFS1 13.42 TOTAL AREA(ACRES) = 4.50 TOTAL RUNOFF(CFS) 13.42 **************************************************************************** FLOW PROCESS FROM NODE 409.00 TO NODE 406.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< >>>>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<<<<< ============================================================================ CONFLUENCE VALUES USED FOR INDEPENDENT STREAM TIME OF CONCENTRATION (MINUTES) = 10.46 RAINFALL INTENSITY (INCH./HOUR) = 3.39 TOTAL STREAM AREA (ACRES) = 4.50 TOTAL STREAM RUNOFF(CFS) AT CONFLUENCE = 2 ARE: 13.42 CONFLUENCE INFORMATION: STREAM RUNOFF TIME NUMBER (crs) (MIN.) INTENSITY (INCH/HOUR 1 ---------------------------------------------------------------------------- 1 2 120.02 13.42 21. 87 10.46 2.264 3.395 RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO FORMULA (RCFC&WCD) USED FOR 2 STREAMS. VARIOUS CONFLUENCED RUNOFF VALUES ARE AS FOLLOWS: 128.98 70.84 COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS: RUNOFF(CFS) = 128.98 TIME (MINUTES1 21.870 TOTAL AREA/ACRES) = 66.40 **************************************************************************** FLOW PROCESS FROM NODE 406.00 TO NODE 410.00 IS CODE = 3 -----------------------------------------------~---------------------------- >>>>>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA<<<<< >>>>>USING COMPUTER-ESTIMATED PIPESIZE (NON-PRESSURE FLOW)<<<<< ---------------------------------------------------------------------------- ---------------------------------------------------------------------------- DEPTH OF FLOW IN 45.0 INCH PIPE IS 32.5 INCHES PIPEFLOW VELOCITY(FEET/SEC.) = 15.1 UPSTREAM NODE ELEVATION = 1075.00 DOWNSTREAM NODE ELEVATION = 1070.00 FLOWLENGTH (FEET) = 300.00 MJ\NNINGS N .013 ESTIMATED PIPE DIAMETER (INCH) 45.00 NUMBER OF PIPES PIPEFLOW THRU SUBAREA(CFS) 128.98 TRAVEL TIME(MIN.) = .33 TC(MIN.) 22.20 1 **************************************************************************** FLOW PROCESS FROM NODE 406.00 TO NODE 410.00 IS CODE = 8 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<< ---------------------------------------------------------------------------- ---------------------------------------------------------------------------- 100.00 YEAR RAINFALL INTENSITY (INCH/HOUR) = SOIL CLASSIFICATION IS "B" COMMERCIAL DEVELOPMENT RUNOFF SUBAREA AREA/ACRES) 4.60 TOTAL AREA(ACRES) 71.00 TC(MIN) ~ 22.20 2.245 COEFFICIENT = .8714 SUBAREA RUNOFF(CFS) 9.00 TOTAL RUNOFF(CFS) = 137.98 SEe. 2-6 Oy II I I I I I I I I I I I I I I I I I I 100-YEAR STORM SECTION 2- 7 **************************************************************************** FLOW PROCESS FROM NODE 406.00 TO NODE 410.00 IS CODE = 1 >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< ---------------------------------------------------------------------------- ---------------------------------------------------------------------------- CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE: TIME OF CONCENTRATION(MINUTESl = 22.20 RAINFALL INTENSITY (INCH./HOURl = 2.25 TOTAL STREAM AREA {ACRES) = 71.00 TOTAL STREAM RUNOFF(CFS) AT CONFLUENCE = 137.98 **************************************************************************** FLOW PROCESS FROM NODE 405.20 TO NODE 405.10 IS CODE = 2 >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< ------------------~~-------------------------~------------------------------ ---------------------------------------------------------------------------- ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS: UNDEVELOPED WITH GOOD COVER TC = K*[(LENGTH**3l/(ELEVATION CHANGE)]**.2 INITIAL SUBAREA FLOW-LENGTH = 1100.00 UPSTREAM ELEVATION = 1204.00 DOWNSTREAM ELEVATION = 1085.00 ELEVATION DIFFERENCE = 119.00 TC = .937*[ (1100.00**3)/( 119.00)]**.2 100.00 YEAR RAINFALL INTENSITY/INCH/HOUR) SOIL CLASSIFICATION IS "e" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .7037 SUBAREA RUNOFF(CFS) 12.69 TOTAL AREA(ACRES) = 8.40 24.080 2.147 12.69 TOTAL RUNOFF(CFS) **************************************************************************** FLOW PROCESS FROM NODE 405.10 TO NODE 407.00 IS CODE = 5 ---------------------------------------------------------------------------- >>>>>COMPUTE TR~PEZOIDAL-CHANNEL FLOW<<<<< >>>>>TRAVELTIME THRU SUBAREA<<<<< ----------------------------------------------------------------~----------- --------------------------------------------~------------------------------- UPSTREAM NODE ELEVATION = 1085.00 DOWNSTREAM NODE ELEVATION = 1075.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 10.00 CHANNEL BASE(FEET) = 10.00 "z" FACTOR = MANNINGS FACTOR = .040 MAXIMUM DEPTH(FEET) CHANNEL FLOW THRU SUBAREA(CFS) = 12.69 FLOW VELOCITY (FEET/SEC) = 8.69 FLOW DEPTH(FEET) TRAVELTIME(MIN.) = .02 TC(MIN.) = 24.10 5.000 5.00 .14 **************************************************************************** FLOW PROCESS FROM NODE 405.10 TO NODE 407.00 IS CODE = 1 >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< ---------------------~---------------------------------------------------~-- -~--------------------~-----------------~-----------------~-----------~-~-~- CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE: TIME OF CONCENTRATION (MINUTES) = 24.10 RAINFALL INTENSITY (INCH./HOUR) = 2.15 TOTAL STREAM AREA (ACRES) = 8.40 TOTAL STREAM RUNOfF(CFS) AT CONFLUENCE = 12.69 **************************************************************************** FLOW PROCESS FROM NODE 407.20 TO NODE 407.10 IS CODE = 2 >>>>>RATIONAL METHOD INITIAL SUBAREA AAALYSIS<<<<< --------~----~~~-------------------------------~-----~---------------------- ----------------------~------~--------------------------------~------------- ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS: UNDEVELOPED WITH GOOD TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2 INITIAL SUBAREA FLOW-LENGTH = 1200.00 UPSTREAM ELEVATION = 1350.00 DOWNSTREAM ELEVATION = 1115.00 ELEVATION DIFFERENCE = 235.00 TC = .937*[ (1200.00**3)/( 235.00)J**.2 100.00 YEAR RAINFALL INTENSITY (INCH/HOUR) COVEE 22.142 2.248 SEe. 2-7 VJ " I I I I I I I I I I I I I I I I I I lOO-YEAR STORM SECTION 2- 8 SOIL CLASSIFICATION IS "en UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .7107 SUBAREA RUNOFF(CFS) 15.02 TOTAL AREA(ACRES) = 9.40 TOTAL RUNOFF(CFS} 15.02 **************************************************************************** FLOW PROCESS FROM NODE 407.10 TO NODE 407.00 13 CODE = 5 >>>>>COMPUTE TRAPEZOIDAL-CHANNEL FLOW<<<<< >>>>>TRAVELTIME THRU SUBAREA<<<<< ~---------------~----------------------------------------------------------- ---------------------------------------------------------------------------- UPSTREAM NODE ELEVATION = 1350.00 DOWNSTREAM NODE ELEVATION = 1115.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 1050.00 CHANNEL BASE(FEET} = 25.00 "z" FACTOR = 5.000 MANNINGS FACTOR = .040 MAXIMUM DEPTH(FEET) 2.00 CHANNEL FLOW THRU SUBAREA{CFS) = 15.02 FLOW VELOCITY (FEET/SEC) = 4.16 FLOW DEPTH{FEET) TRAVEL TIME[MIN.) = 4.21 TC{MIN.) = 26.35 .14 **************************************************************************** FLOW PROCESS tROM NODE 407.10 TO NODE 8 407.00 IS CODE = >>>>>ADDITION Ot SUBAREA TO MAINLINE PEAK tLOW<<<<< ---------------------------------------------------------------------------- ---------------------------------------------------------------------------- 100.00 YEAR RAINFALL INTENSITY (INCH/HOUR) 2.043 SOIL CLASSIFICATION IS "B" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .5949 SUBAREA AREA(ACRES} 13.80 SUBAREA RUNOFF(CFS) 16.77 TOTAL AREA(ACRES} 23.20 TOTAL RUNOFFiCFS) = 31.79 TC(MIN) = 26.35 **************************************************************************** FLOW PROCESS tROM NODE 407.10 TO NODE 407.00 IS CODE = 1 >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< >>>>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<<<<< ---------------------------------------------------------------------------- ---------------------------------------------------------------------------- CONFLUENCE VALUES USED FOR INDEPENDENT STREAM TIME OF CONCENTRATION(MINUTES) = 26.35 RAINFALL INTENSITY (INCH./HOURj = 2.04 TOTAL STREAM AREA (ACRES) = 23.20 TOTAL STREAM RUNOFF(CFS) AT CONFLUENCE = 3 ARE: 31. 7 9 CONFLUENCE INFORMATION: STREAM RUNOFF TIME NUMBER (CFS) (MIN. ) INTENSITY (INCH/HOUR) 1 2 3 137.98 12.69 31. 79 2.245 2.146 2.043 22.20 24.10 26.35 RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO FORMULA (RCFC&WCD) USED FOR 3 STREAMS. VARIOUS CONFLUENCED RUNOFF VALUES ARE AS FOLLOWS: 176.45 173.66 169.44 COMPUTED CONFLUENCE ESTIMATES ARE AS tOLLOWS: RUNOFF(CFS) = 176.45 TIME (MINUTES) = 22.201 TOTAL AREA/ACRES) = 102.60 ============================================================================ END OF RATIONAL METHOD ANALYSIS SEe. 2-8 ,'\\ I I. 10-YEAR STORM SECTION 3- 1 I RATIONAL METHOD HYDROLOGY COMPUTER PROGRAM BASED ON RIVERSIDE COUNTY FLOOD CONTROL & WATER CONSERVATION DISTRICT (RCFC&WCD) 1978 HYDROLOGY MANUAL ============================================================================ I <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> (C) Copyright 1982,1986 Advanced Engineering Software [AESJ I <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> I **********DESCRIPTION OF RESULTS******************************************** '" PM29162 10 YEAR STORM * * * * **************************************************************************** I USER SPECIFIED HYDROLOGY AND HYDRAULIC MODEL INFORMATION: I USER SPECIFIED STORM EVENT(YEAR) = 10.00 SPECIFIED MINIMUM PIPE SIZE(INCH) = 18.00 SPECIFIED PERCENT OF GRADIENTS(DECIMAL) TO USE FOR FRICTION SLOPE .90 10-YEAR STORM lO-MINUTE INTENSITY (INCH/HOUR) = 2.360 10-YEAR STORM 60-MINUTE INTENSITY {INCH/HOURj = .880 100-YEAR STORM 10-MINUTE INTENSITY (INCH/HOUR) 3.480 100-YEAR STORM 60-MINUTE INTENSITY (INCH/HOUR) 1.300 SLOPE OF 10-YEAR INTENSITY-DURATION CURVE = .5505732 SLOPE OF 100-YEAR INTENSITY-DURATION CURVE = .5495536 COMPUTED RAINFALL INTENSITY DATA: STORM EVENT = 10.00 I-HOUR INTENSITY {INCH/HOURl _8888 SLOPE OF INTENSITY DURATION CURVE = .5506 I I RCFC&WCD HYDROLOGY MANUAL "Cn-VALUES USED <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> I Advanced Engineering Software [AES] SERIAL No. 100971 VER. 3.3C RELEASE DATE: 2/20/86 I <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> **************************************************************************** I fLOW PROCESS fROM NODE 403.30 TO NODE 403.20 IS CODE = 2 >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< ------------------------------------~----------------~---------------------- ---------------------------------~----------------~------------------------- I ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS: UNDEVELOPED WITH GOOD COVER TC = K*[(LENGTH**3)/(ELEVATION CHANGEl]**.2 INITIAL SUBAREA FLOW-LENGTH = 1000.00 UPSTREAM ELEVATION = 1805.00 DOWNSTREAM ELEVATION = 1350.00 ELEVATION DIFFERENCE = 455.00 TC = .937*({ 1000.OO**3l/( 455.00l1**.2 10.00 YEAR RAINFALL INTENSITY (INCH/HOUR) SOIL CLASSIFICATION IS "D" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .7183 SUBAREA RUNOFF(CFS) 7.07 TOTAL AREA(ACRES) = 5.60 17.391 1.758 I I TOTAL RUNOFF(CFS) 7.07 I **************************************************************************** FLOW PROCESS FROM NODE 403.30 TO NODE 403.20 IS CODE = 1 >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< ============================================================================ I CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE: TIME OF CONCENTRATION(MINUTES) = 17.39 I SEC. 3-1 VJ,; I I I I I I I I I I I I I I I I I I I 10-YEAR STORM SECTION 3- 2 RAINFALL INTENSITY (INCH./HOUR) = 1.76 TOTAL STREAM AREA (ACRES) = 5.60 TOTAL STREAM RUNOFF(CFS) AT CONFLUENCE = 7.07 **************************************************************************** FLOW PROCESS FROM NODE 403.40 TO NODE 2 403.20 IS CODE = >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< ----~-~--------------------------------------------------------------------- -----~--------------------------------------------------------------------- ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS: UNDEVELOPED WITH GOOD COVER TC = K*[(LENGTH**3l/(ELEVATION CHANGE]]**.2 INITIAL SUBAREA FLOW-LENGTH = 1000.00 UPSTREAM ELEVATION = 1825.00 DOWNSTREAM ELEVATION = 1350.00 ELEVATION DIFFERENCE = 475.00 TC = .937*[ (1000.00**3)/( 475.00))**.2 17.242 10.00 YEAR RAINFALL INTENSITY (INCH/HOUR) 1.766 SOIL CLASSIFICATION IS "0" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .7190 SUBAREA RUNOFF(CFS) 11.17 TOTAL AREA(ACRES) = 8.80 TOTAL RUNOFF(CFS) 11.17 **************************************************************************** FLOW PROCESS rRCM NODE 403.20 IS CODE = 1 403.40 TO NODE >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< >>>>>AND COMPUTE VARIOUS CONFLUENCED STRE~M VALUES<<<<< CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE: TIME OF CONCENTRATION{MINUTES) = 17.24 RAINFALL INTENSITY (INCH./HOUR) = 1.77 TOTAL STREAM AREA (ACRES) = 8.80 TOTAL STREAM RUNOFF (CFS) AT CONFLUENCE = 11.17 CONFLUENCE INFORMATION: STREAM RUNOFF TIME NUMBER (CFS) (MIN.) INTENSITY (INCH/HOUR) 1 2 7.07 11.17 1.758 1.766 17.39 17 .24 RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO FORMULA (RCFC&WCD) USED FOR 2 STREAMS. VARIOUS CONFLUENCED RUNOFF VALUES ARE AS FOLLOWS: 18.19 18.18 COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS: RUNOFF(CFS) = 18.19 TIME (MINUTES) 17.391 TOTAL AREA(ACRES) = 14.40 **************************************************************************** FLOW PROCESS FROM NODE 403.20 TO NODE 5 403.10 IS CODE = >>>>>CQMPUTE TRAPEZOIDAL-CHANNEL FLOW<<<<< >>>>>TRAVELTIME THRU SUBAREA<<<<< -------------------~----------------------------~~~~-~---------------------- ---~~~~~~---~-------------------~--~---------~----------------------------~~ UPSTREAM NODE ELEVATION = 1350.00 DOWNSTREAM NODE ELEVATION = 1220.00 CHANNEL LENGTH THRU SUBAREA/FEET) = 900.00 CHANNEL BASE{FEET) = 25.00 "z" FACTOR = 4.000 MN-l"NINGS FACTOR = .040 MAXIMUM DEPTH(FEET) 4.00 CHANNEL FLOW THRU SUBAREA{CFS) = 18.19 FLOW VELOCITY (FEET/SECl = 4.12 FLOW DEPTH(FEET) .17 TRAVEL TIME(MIN.) = 3.64 TC(MIN.) = 21.03 **************************************************************************** FLOW PROCESS FROM NODE 403.20 TO NODE 8 403.10 IS CODE = >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<< ============================================================================ SEe. 3-2 \;'? I I I. 10- YEAR STORM SECTION 3- 3 10.00 YEAR RAINFALL INTENSITY (INCH!HOUR) 1.583 SOIL CLASSIFICATION IS "D" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .7027 SUBAREA AREA(ACRES) 13.60 SUBAREA RUNOFF(erS) TOTAL AREA{ACRES) 28.00 TOTAL RUNOFF(CFS) = TC(MIN) = 21.03 15.13 33.32 I **************************************************************************** FLOW PROCESS FROM NODE 403.10 TO NODE 404.10 IS CODE = 3 I >>>>>COMPUTE PIPE FLOW TRAVELTIME THRU SUBAREA<<<<< >>>>>USING COMPUTER-ESTIMATED PIPESIZE (NON-PRESSURE FLOWl<<<<< I DEPTH OF FLOW IN 18.0 INCH PIPE IS 14.0 INCHES PIPEFLOW VELOCITY(FEET/SEC.) = 22.5 UPSTREAM NODE ELEVATION = 1220.00 DOWNSTREAM NODE ELEVATION = 1140.00 FLOWLENGTH(FEET) = 650.00 MANNINGS N ESTIMATED PIPE DIAMETER (INCH) 18.00 PIPEFLOW THRU SUBAREA(CfS) 33.32 TRAVEL TIME{MIN.) = .48 TC(MIN.) .013 NUMBER OF PIPES 1 I 21. 51 **************************************************************************** I FLOW PROCESS FROM NODE 403.10 TO NODE 404.10 IS CODE = 1 >>>>>OESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< I CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE: TIME OF CONCENTRATION(MINUTES) = 21.51 RAINFALL INTENSITY (INCH./HOUR) = 1.56 TOTAL STREAM AREA (ACRES) = 28.00 TOTAL STREAM RUNOFF(CFS) AT CONFLUENCE = 33.32 I **************************************************************************** FLOW PROCESS FROM NODE 400.00 TO NODE 401.00 IS CODE = 2 I >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< . ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS: UNDEVELOPED ~TH GOOD COVER TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2 INITIAL SUBAREA FLOW-LENGTH = 700.00 UPSTREAM ELEVATION = 1595.00 DOWNSTREAM ELEVATION = 1260.00 ELEVATION DIFFERENCE = 335.00 TC = .937*[( 700.00**31/( 335.001]**.2 10.00 YEAR RAINFALL INTENSITY (INCH/HOUR) SOIL CLASSIFICATION IS "0" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT ~ .7302 SUBAREA RUNOFF(CFS) 7.54 TOTAL AREA(ACRES1 = 5.40 14.927 1.912 I I TOTAL RUNOFF(CFS) 7.54 **************************************************************************** I FLOW PROCESS FROM NODE 401.00 TO NODE 403.00 IS CODE = 5 >>>>>COMPUTE TRAPEZOIDAL-CHANNEL FLOW<<<<< >>>>>TRAVELTIME THRU SUBAREA<<<<< I UPSTREAM NODE ELEVATION = 1260.00 DOWNSTREAM NODE ELEVATION = 1155.00 CHANNEL LENGTH THRU SUBAREA(FEETj = 850.00 CHANNEL BASE{FEET) = 25.00 "Z" FACTOR = MANNINGS FACTOR = .040 MAXIMUM DEPTH (FEET) CHANNEL FLOW THRU SUBAREA(CFS) = 7.54 FLOW VELOCITY {FEET/SEC} = 3.04 FLOW DEPTH (FEET) TRAVEL TIME(MIN.} = 4.66 TC(MIN.) = 19.59 4. 000 5.00 I .10 I **************************************************************************** FLOW PROCESS FROM NODE 401.00 TO NODE 403.00 IS CODE = 8 I SEe. 3-3 "^ I I 10-YEAR STORM SECTION 3- 4 I >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<< ~--------------------------------------------------------------------------- ---------------------------------------------------------------------------- I 10.00 YEAR RAINFALL INTENSITY (INCH!HOUR) 1.646 SOIL CLASSIFICATION IS "c" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT ~ .6599 SUBAREA AREA(ACRES) 4.30 SUBAREA RUNOFF(CF3) 4.67 TOTAL AREA(ACRES) 9.70 TOTAL RUNOFF(CFS) ~ 12.21 TCIMIN) ~ 19.59 I **************************************************************************** FLOW PROCESS FROM NODE 403.00 TO NODE 404.10 IS CODE = 3 I >>>>>COMPUTE PIPE FLOW TRAVELTIME THRU SUBAREA<<<<< >>>>>USING COMPUTER-ESTIMATED PIPESIZE (NON-PRESSURE FLOW)<<<<< I ESTIMATED PIPE DIAMETER/INCH) INCREASED TO 18.000 DEPTH OF FLOW IN 18.0 INCH PIPE IS 8.4 INCHES PIPEFLOW VELOCITY{FEET/SEC.) = 15.2 UPSTREAM NODE ELEVATION = 1190.00 DOWNSTREAM NODE ELEVATION = 1140.00 FLOWLENGTH(FEET) = 650.00 MANNINGS N .013 ESTIMATED PIPE DIAMETER{INCH) 18.00 NUMBER OF PIPES 1 PIPEFLOW THRU SUBAREA (CFSj 12.21 TRAVEL TIME (MIN.) = .71 TC (MIN. ) 20.30 I **************************************************************************** I FLOW PROCESS FROM NODE 403.00 TO NODE 404.10 IS CODE = 5 >>>>>COMPUTE TRAPEZOIDAL-CHANNEL FLOW<<<<< >>>>>TRAVELTIME THRU SUBAREA<<<<< I UPSTREAM NODE ELEVATION = 1155.00 DOWNSTREAM NODE ELEVATION = 1140.00 CHANNEL LENGTH THRU SUBAREA/FEET) = 240.00 CHANNEL BASE ( FEET) = 25.00 "z" FACTOR = 4 . 000 MANNINGS FACTOR ~ .040 MAXIMUM DEPTHIFEET) 5.00 CHANNEL FLOW THRU SUBAREA (CFS) = 12.21 FLOW VELOCITY (FEET/SECl = 2.70 FLOW DEPTH(FEETl TRAVEL TIME{HIN.) = 1.48 TC{MIN.) = 21.78 .18 I I **********************~***************************************************** FLOW PROCESS FROM NODE 403.00 TO NODE 404.10 IS CODE = 8 >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<< I 10.00 YEAR RAINFALL INTENSITY (INCH/HOUR) = 1.553 SOIL CLASSIFICATION IS "C" COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT ~ .8749 SUBAREA AREA{ACRES) 4.80 SUBAREA RUNOFF(CFS) 6.52 TOTAL AREA/ACRES) 14.50 TOTAL RUNOFF{CFS) = IB.73 TCIMINI ~ 21.78 I ********************~**********+~*****+**+*~**~********~************~******* I FLOW PROCESS FROM NODE 403.00 TO NODE 404.10 IS CODE = 1 >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< >>>>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<<<<< I CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE: TIME OF CONCENTRATION(MINUTES) = 21.78 R~INFALL INTENSITY (INCH./HOUR) = 1.55 TOTAL STREAM AREA (ACRES) = 14.50 TOTAL STREAM RUNOFF(CFS) AT CONFLUENCE = 18.73 I CONFLUENCE INFORMATION: STREFM RUNOFF TIME INTENSITY NUMBER (CFS) (MIN.) (INCH/HOUR) I 1 33.32 21. 51 1. 563 I SEe. 3-4 Vb ,I II 10- YEAR STORM SECTION 3- 5 2 18.73 21.78 1. 553 I RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO FORMULA (RCFC&WCD) USED FOR 2 STREAMS. VARIOUS CONFLUENCED RUNOFF VALUES ARE AS FOLLOWS: 51. 82 51. 82 COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS: RUNOFF(CFS) = 51.82 TIME (MINUTES) 21.782 TOTAL AREA (ACRES) = 42.50 I I **************************************************************************** FLOW PROCESS FROM NODE 404.10 TO NODE 405.00 IS CODE = 3 I >>>>>COMPUTE PIPE FLOW TRAVELTIME THRU SUBAREA<<<<< >>>>>USING COMPUTER-ESTIMATED PIPESIZE (NON-PRESSURE FLOWj<<<<< I DEPTH OF FLOW IN 24.0 INCH PIPE IS 15.3 INCHES PIPEFLOW VELOCITY(FEET/SEC.) = 24.5 UPSTREAM NODE ELEVATION = 1140.00 DOWNSTREAM NODE ELEVATION = 1086.00 FLOWLENGTH(FEET) = 500.00 MANNINGS N .013 ESTIMATED PIPE DIAMETER(INCH} 24.00 NUMBER OF PIPES 1 PIPEFLOW THRU SUBAREA(CFS) 51.82 TRAVEL TIME(MIN.) = .34 TC(MIN.) 22.12 I **************************************************************************** FLOW PROCESS FROM NODE 404.10 TO NODE 405.00 IS CODE = 8 I >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<< I 10.00 YEAR RAINFALL INTENSITY(INCH/HOUR) = SOIL CLASSIFICATION IS "8" COMMERCIAL DEVELOPMENT RUNOFF SUBAREA AREA(ACRES) 11.30 TOTAL AREA(ACRES) 53.80 TC(MIN) = 22.12 1. 540 COEFFICIENT = .8636 SUBAREA RUNOFF(CFS) TOTAL RUNOFF(CFS) = 15.02 66.85 I **************************************************************************** FLOW PROCESS FROM NODE 405.00 TO NODE 406.00 IS CODE = 3 I >>>>>COMPUTE PIPE FLOW TRAVELTIME THRU SUBAREA<<<<< >>>>>USING COMPUTER-ESTIMATED PIPESIZE (NON-PRESSURE FLOWJ<<<<< --------~----------------------------------------------------------~-------- ------------------~----~---------------------------------------------------- I DEPTH OF FLOW IN 33.0 INCH PIPE IS 24.4 INCHES PIPEFLOW VELOCITY(FEET/SEC.) = 14.2 UPSTREAM NODE ELEVATION = 1086.00 DOWNSTREAM NODE ELEVATION = 1075.00 FLOWLENGTH(FEET) = 500.00 MANNINGS N .013 ESTIMATED PIPE DI.AMETER (INCH) 33.00 NUMBER OF PIPES 1 PIPEFLOW THRU SUBAREA (CfS) 66.85 TRAVEL TIME(MIN.) = .59 TC(MIN.) 22.71 I **************************************************************************** FLOW PROCESS FROM NODE 405.00 TO NODE 406.00 IS CODE = 8 I >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<< -------------------~-------------------------~----------------~------------- -------------------~-------------------------------------------------------- I 10.00 YEAR RAINFALL INTENSITY (INCH/HOUR) = SOIL CLASSIFICATION IS "8" COMMERCIAL DEVELOPMENT RUNOFF SUBAREA AREA(ACRES) 8.10 TOTAL AREA(ACRES) 61.90 TC(MIN) = 22.71 1.517 COEFFICIENT = .8632 SUBAREA RUNOFF(CFSj TOTAL RUNOFF(CFS) = 10.61 77.46 I **************************************************************************** FLOW PROCESS FROM NODE 405.00 TO NODE 406.00 IS CODE = 1 ---------------------------------------------------------------------------- I >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< ============================================================================ I SEe. 3-5 \fo I I 10-YEAR STORM SECTION 3- 6 I CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE: TIME OF CONCENTRATION(MINUTES) = 22.71 RAINFALL INTENSITY (INCH.!HOUR) = 1.52 TOTAL STREAM AREA (ACRES) = 61.90 TOTAL STREAM RUNOFF(CFS) AT CONFLUENCE = 77.46 I ***************************************************~************************ FLOW PROCESS FROM NODE 409.00 TO NODE 406.00 IS CODE = 2 I >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< I ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS COMMERCIAL TC = K*{ (LENGTH**3)/(ELEVATION CHANGE)]**.2 INITIAL SUBAREA FLOW-LENGTH = 700.00 UPSTREAM ELEVATION = 1082.00 Dom~STREAM ELEVATION = 1075.00 ELEVATION DIFFERENCE = 7.00 TC = .303*[( 700.00**3)!! 7.00)]**.2 10_462 10.00 YEAR RAINFALL INTENSITY (INCH/HOUR) 2.325 SOIL CLASSIFICATION IS "B" COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8720 SUBAREA RVNOFF{CFS) 9.12 TOTAL AREA (ACRES) = 4.50 TOTAL RUNOFF(CFS) 9.12 I I **************************************************************************** FLOW PROCESS FROM NODE 409.00 TO NODE 406.00 IS CODE = 1 I >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< >>>>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<<<<< I CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE: TIME OF CONCENTRATION (MINUTES) = 10.46 RAINFALL INTENSITY IINCH./HOUR) = 2.33 TOTAL STREAM AREA (ACRES) = 4.50 TOTAL STREAM RUNOFF(CFS) AT CONFLUENCE = 9.12 I CONFLUENCE INFORMATION: STREAM RUNOFF TIME NUMBER (CFS) (MIN.) INTENSITY (INCH/HOUR) I 1 2 77.46 9.12 22.71 10.46 1.517 2.325 I RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO FORMULA(RCFC&WCD) USED FOR 2 STREAMS. VARIOUS CONFLUENCED RUNOFF VALUES ARE AS FOLLOWS: 83.41 44.81 COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS: RUNOFFICFS) = 83.41 TIMEIMINUTESI 22.709 TOTAL AREA/ACRES) = 66.40 I **************************************************************************** FLOW PROCESS FROM NODE 406.00 TO NODE 410.00 IS CODE = 3 I >>>>>COMPUTE PIPE FLOW TRAVELTIME THRU SUBAREA<<<<< >>>>>USING COMPUTER-ESTIMATED PIPESIZE (NON-PRESSURE FLOW)<<<<< ============================================================================ I DEPTH OF FLOW IN 39.0 INCH PIPE IS 27.0 INCHES PIPE FLOW VELOCITY(FEET/SEC.) = 13.6 UPSTREAM NODE ELEVATION = 1075.00 DOWNSTREAM NODE ELEVATION = 1070.00 F10WLENGTH(FEET) = 300.00 MANNINGS N .013 ESTIMATED PIPE DIAMETER (INCH) 39.00 NUMBER OF PIPES PIPEF10W THRU SUBAREA(CFS) 83.41 TRJ\VEL TIME (MIN.) = .37 TC (MIN. ) 23.08 1 I **************************************************************************** I FLOW PROCESS FROM NODE 406.00 TO NODE 410.00 IS CODE = 8 I SEe. 3-6 ", I I I I I I I I I I I I I I I I I I I lo-YEAR STORM SECTION 3- 7 >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<< 10.00 YEAR RAINFALL INTENSITY(INCH/HOUR) ~ SOIL CLASSIFICATION IS "8" COMMERCIAL DEVELOPMENT RUNOFF SUBAREA AREA(ACRES) 4.60 TOTAL AREA(ACRES) 71.00 TC(MIN) = 23.08 1. 504 COEFFICIENT = .8631 SUBAREA RUNOFF(CFS) TOTAL RUNOFF(CFS) = 5.97 89.38 **************************************************************************** FLOW PROCESS FROM NODE 406.00 TO NODE 410.00 IS CODE = 1 >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE: TIME OF CONCENTRATION (MINUTES) = 23.08 RAINFALL INTENSITY (INCH./HOUR) = 1.50 TOTAL STREAM AREA (ACRES) = 71.00 TOTAL STREAM RUNOFF (CFS) AT CONFLUENCE = 89.38 **************************************************************************** FLOW PROCESS FROM NODE 405.20 TO NODE 405.10 IS CODE = 2 >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< ASSUMED INITIAL SUBAREA UNI~RM DEVELOPMENT IS: UNDEVELOPED WITH GOOD COVER TC = K*[ (LENGTH**3)/(ELEVATION CHANGE))**.2 INITIAL SUBAREA FLOW-LENGTH = 1100.00 UPSTREAM ELEVATION = 1204.00 DOWNSTREAM ELEVATION = 1085.00 ELEVATION DIFFERENCE = 119.00 TC = .937*[( 1100.00**3)/( 119.00)]**.2 10.00 YEAR RAINFALL INTENSITY (INCH/HOURJ SOIL CLASSIFICATION IS "C" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .6393 SUBAREA RUNOFF(CFS) 7.89 TOTAL AREA(ACRES) = 8.40 24.080 1.469 7.89 TOTAL RUNOFF(CFS) **************************************************************************** FLOW PROCESS FROM NODE 405.10 TO NODE 5 407.00 IS CODE = >>>>>COMPUTE TRAPEZOIDAL-CHANNEL FLOW<<<<< >>>>>TRAVELTIME THRU SUBAREA<<<<< UPSTREAM NODE ELEVATION = 1085.00 DOWNSTREAM NODE ELEVATION = 1075.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 10.00 CHANNEL BASEIFEET) = 10.00 "Z" FACTOR = MANNINGS FACTOR = .040 MAXIMUM DEPTH(FEET) CHANNEL FLOW THRU SUBAREA (CFS) = 7.89 FLOW VELOCITY (FEET/SEC) = 7.70 FLOW DEPTH (FEET) TRAVEL TIME (MIN.) = .02 TC (MIN. 1 = 24.10 5.000 5.00 .10 **************************************************************************** FLOW PROCESS FROM NODE 407.00 IS CODE = 1 405.10 TO NODE >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE: TIME OF CONCENTRATION (MINUTES) = 24.10 RAINFALL INTENSITY (INCH./HOUR) = 1.47 TOTAL STREAM AREA (ACRES) ~ 8.40 TOTAL STREAM RUNOFF{CFS} AT CONFLUENCE = 7.89 **************************************************************************** FLOW PROCESS FROM NODE 407.10 IS CODE = 2 407.20 TO NODE >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< SEC. 3-7 w. I I. I I I I I I I I I I I I I I I I I lO-YEAR STORM SECTION 3- 8 ============================================================================ ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS: UNDEVELOPED WTTH GOOD COVER TC = K*[ [LENGTH**3lf(ELEVATION CHANGEl]**.2 INITIAL SUBAREA FLOW-LENGTH = 1200.00 UPSTREAM ELEVATION = 1350.00 DOWNSTREAM ELEVATION = 1115.00 ELEVATION DIFFERENCE = 235.00 TC = .937*[ (1200.00**3)/( 235.00))**.2 22.142 10.00 YEAR RAINFALL INTENSITY {INCH!HOURl 1.539 SOIL CLASSIFICATION IS "e" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .6478 SUBAREA RUNOFF(CFSj 9.37 TOTAL AREA(ACRESl = 9.40 TOTAL RUNOFF(CFS) 9.37 **************************************************************************** FLOW PROCESS FROM NODE 407.10 TO NODE 407.00 IS CODE ~ 5 ---------------------------------------------------------------------------- >>>>>COMPUTE TRAPEZOIDAL-CHANNEL FLOW<<<<< >>>>>TRAVELTIME THRU SUBAREA<<<<< ================~=========================================================== UPSTREAM NODE ELEVATION = 1350.00 DOWNSTREAM NODE ELEVATION ~ 1115.00 CHANNEL LENGTH THRU SUBAREA(FEETl = 1050.00 CHANNEL BASE (FEET) = 25.00 "Z" FACTOR ~ 5.000 MANNINGS FACTOR = .040 MAXIMUM DEPTH(FEET) 2.00 CHANNEL FLOW THRU SUBAREA(CFSl = 9.37 FLOW VELOCITY(FEET/SEC) ~ 3.35 FLOW DEPTH(FEET) .11 TRAVEL TIME(MIN.) = 5.22 TC(MIN.) = 27.36 **************************************************************************** FLOW PROCESS FROM NODE 407.10 TO NODE 407.00 IS CODE = 8 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<< ---~~~------------------------------------------------------------------- ---------------------------------------------------------------------------- 10.00 YEAR RAINFALL INTENSITY (INCH!HOUR) 1.370 SOIL CLASSIFICATION IS "B" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .5099 SUBAREA AREA(ACRESl 13.80 SUBAREA RUNOFF{CFSl 9.64 TOTAL AREA (ACRES) 23.20 TOTAL RUNOFf(CFS} = 19.01 TC(MIN} = 27.36 **************************************************************************** FLOW PROCESS FROM NODE 407.10 TO NODE 407.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< >>>>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<<<<< ---------------------------------------------------------------------------- --------------------------------------------------~------------------------- CONFLUENCE VALUES USED fOR INDEPENDENT STREAM 3 ARE: TIME OF CONCENTRATION (MINUTES) = 27.36 RAINFALL INTENSITY /INCH.!HOUR) = 1.37 TOTAL STREAM AREA (ACRES) = 23.20 TOTAL STREAM RUNOFf{CFS} AT CONfLUENCE = 19.01 CONFLUENCE INFORMATION: STREAM RUNOFF TIME NUMBER (CFS) (MIN.) INTENSITY [INCH/HOUR) ---------------------------------------------------------------------------- 1 2 3 89.38 7.89 19.01 23.08 24.10 27.36 1.504 1.469 1.370 RAINfALL INTENSITY AND TIME OF CONCENTRATION RATIO fORMULA (RCFC&WCDl USED fOR 3 STREAMS. VARIOUS CONFLUENCED RUNOFF VALUES ARE AS FOLLOWS: 112.97 111.90 107.75 COMPUTED CONFLUENCE ESTIMATES ARE AS fOLLOWS: RUNOFF/CFS) = 112.97 TIME (MINUTES) = 23.076 TOTAL AREA(ACRES} = 102.60 ==============~~===========~======================~======~================== END OF RATIONAL METHOD ANALYSIS SEe. 3-8 \0.