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Home My WebLink AboutLot 1-8 Drainage Study -. I I I I I !'I il I J I I II ... i I:' 1 .,. I '. ~ TENTATIVE TRACT MAP 291333 DRAINAGE STUDY October 7, 1999 Prepared For: Michael Lanni P.o. Box 7284 Newport Beach, CA 92660 Prepared By: HLC 43533 Ridge Park Dr., Suite B Ternecula, CA 92590 (909) 506-4869 :7.,;,.". ~;.., RCE 36;;" RECEIVED OCT 1 21999 CITY OF TEMECULA ENGINEERING DEPARTMENT \ I I I I I I I I I I I I I I I ,I I I II TENTATIVE TRACT MAP 291333 DRAINAGE STUDY October 7, 1999 Prepared For: Michael Lanni P.D. Box 7284 Newport Beach, CA 92660 By: \~ '" H~torL. OITea,~36306 z.. I I i J I I I ! I I I I I I , I ! I I I I I II TABLE (J)F CONTENTS SUBJECT PAGE DRAINAGE STUDY REPORT 100 YEAR DEVELOPED CONDITION 100 YEAR EXISTING CONDITION HYDROLOGY EXHIBIT MAP 1 3 5 6 ~ I I I I I I I I I I I I I I I I I I I TENTATIVE TRACT MAP 29133 DRAINAGE STUDY STUDY AREA The subject property consists of approximately 4.8 acres, located on the easterly side ofYnez Road 707 feet south ofPauba Road. The site is protected from off-site storm runoff by Tract No.15730 subdivision street and storm drain system. See Exhibit "A" for drainage boundary and estimated 10/l00-year storm runoff. HYDROLOGY The developments will not change existing drainage patterns and will only increase the existing 100-year storm from 7.6 cfs to 12.2 cfs. PROPOSED DRAINAGE IMPROVEMENTS The developed storm runoffwill be discharged into an a proposed 30" storm drain that will connect to the existing 30-inch storm drain in Y nez Road. The proposed 30" storm drain will join the existing storm drain northerly of the site and be extended to the southerly property line where it will discharge into an existing earthen channel that conveys storm flows to an existing 42-inch storm drain at Pre~e Lane (Tract No. 20643). 1 ~ I I I I I I I I 1 I i I I I I I I I I I I I 100 YEAR DEVELOPED CONDITION '5 I I I 100 YEAR DEVELOPED CONDITION ============================================================================ I 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 [ABS] I <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> I **********DESCRIPTION OF RESULTS******************************************** * TENTATIVE TRACT MAP 29133 * * DEVELOPED 100 YEAR STORM * * HLC * **************************************************************************** I USER SPECIFIED HYDROLOGY AND HYDRAULIC MODEL INFORMATION: I USER SPECIFIED STORM EVENT(YEAR) = 100.00 SPECIFIED MINIMUM PIPE SIZE(INCH) = 12.00 SPECIFIED PERCENT OF GRADIENTS(DECIMALj TO USE FOR FRICTION SLOPE 10-YEAR STORM IQ-MINUTE INTENSITY fINCH/HOUR) = 2.360 IO-YEAR STORM 60-MINUTE INTENSITY (INCH/HOURj = .880 IOO-YEAR STORM IO-MINUTE INTENSITY(INCH/HOURj 3.480 IOO-YEAR STORM 60-MINUTE INTENSITY(INCH/HOURj 1.300 SLOPE OF IO-YEAR INTENSITY-DURATION CURVE = .5505732 SLOPE OF 100TYEAR 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 .90 I I RCFC&WCD HYDROLOGY MANUAL "en-VALUES USED I <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> I Advanced Engineering Software [AES) SERIAL No. 100971 VER. 3.3C RELEASE DATE: 2/20/86 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> ************************************************************************ I FLOW PROCESS FROM NODE 1.00 TO NODE 2.00 IS CODE ~ 2 ----------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< I ======================================================================== I ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS SINGLE FAMILY(1/2 ACRE) TC ~ K*((LENGTH**3)/(ELEVATION CHANGE)]**,2 INITIAL SUBAREA FLOW-LENGTH ~ 900.00 UPSTREAM ELEVATION ~ 1176.00 DOWNSTREAM ELEVATION ~ 1075,00 ELEVATION DIFFERENCE ~ 101.00 TC = .422*[( 900.00**3)/( 101.00}]**.2 9.933 100.00 YEAR RAINFALL INTENSITY (INCH/HOUR) 3.493 SOIL CLASSIFICATION IS "B" SINGLE-FAMILY(1/2 ACRE LOT) RUNOFF COEFFICIENT ~ .7754 SUBAREA RUNOFF(CFS) 12.21 TOTAL AREA(ACRES) ~ 4.51 TOTAL RUNOFF(CFS) ~ 12,21 I I I ======================================================================== I END OF RATIONAL METHOD ANALYSIS I - 3 - ~ I I i I ! I I I I I I I I I I I I I I I I 100 EXISTING CONDITION 1 I 100 YEAR EXISTING CONDffiON I I RATIONAL METHOD HYDROLOGY COMPUTER PROGRAM BASED ON RIVERSIDE COUNTY FLOOD CONTROL & WATER CONSERVATION DISTRICT (RCFC&WCD) 1978 HYDROLOGY MANUAL , I <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> te) Copyright 1982,1986 Advanced Engineering Software [AES] <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> I **********DESCRIPTION OF '" TTM 29133 EXISTING 100 '" AUG. 17 1999 '" HLC RESULTS******************************************** YEAR STORM * * * I **************************************************************************** USER SPECIFIED HYDROLOGY AND HYDRAULIC MODEL IN~RMATION: I USER SPECIFIED STORM EVENT(YEAR) = 100.00 SPECIFIED MINIMUM PIPE SIZE(INCH) = 12.00 SPECIFIED PERCENT OF GRADIENTS(DECIMAL) TO USE FOR FRICTION SLOPE la-YEAR STORM la-MINUTE INTENSITY/INCH/HOUR) = 2.360 IO-YEAR STORM 60-MINUTE INTENSITY(INCH/HOUR) = .880 100-YEAR STORM 10-MINUTE INTENSITY I INCH/HOUR) 3.480 100-YEAR STORM 60-MINUTE INTENSITY{INCH/HOUR) 1.300 SLOPE OF ID-YEAR INTENSITY-DURATION CURVE = .5505732 SLOPE OF lOa-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 .90 I I RCFC&WCD HYDROLOGY MANUAL "C"-VALUES USED I <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> I Advanced Engineering Software lAES] SERIAL No. 100971 VER. 3.3C RELEASE DATE: 2/20/86 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> I **************************************************************************** FLOW PROCESS FROM NODE L 00 TO NODE 2.00 IS CODE ~ 2 I >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< I ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS: UNDEVELOPED WITH FAIR COVER TC = K*((LENGTH**3)/(ELEVATION CHANGE)]**.2 INITIAL SUBAREA FLOW-LENGTH = 900.00 UPSTREAM ELEVATION = 1176.00 DOWNSTREAM ELEVATION = 1075.00 ELEVATION DIFFERENCE = 101.00 TC = .709*[( 900.00**3)/( 101.00}J**.2 100.00 YEAR RAINFALL INTENSITY(INCH/HOUR} SOIL CLASSIFICATION IS "B" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .6433 SUBAREA RUNOFF(CFS} = 7.62 TOTAL AREA (ACRES) = 4.51 16.694 2.626 I I TOTAL RUNOFF(CFS) 7.62 ============================================================================ END OF RATIONAL METHOD ANALYSIS I I II - 5 - ~ I I i I I ! 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