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HomeMy WebLinkAboutParcel Map 31711 Parcel 1-3 Hydrology(May25,2005) f);/)/I-o(o( ~ HYDROLOGY STUDY FOR CITY OF TEMECULA PM 31711 GALLATIN DENTAL OFFICE BUILDING COMPLEX COT P A 04-0612 PREPARED BY RDS & ASSOCIATES RICH SOLTYSIAKRCE No. 37233 MAY 25, 2005 ./ ~ RDS & Associates \. I. BACKGROUND The project is located on the northeast comer of De Portola and Margarita Roads within the City of Temecula. The project is a development plan to (:onstruct a 3 Office Buildings on a vacant 3 acre parcel. Existine Drainaee The existing site's storm flow run off is currently conveyed across the site from north to south into De Portola Road. De Portola Road drains via an existing storm drain system and ultimately into Temecula Creek. Proposed Drainaee Developed flows will be conveyed via overland curb and gutter flow into a landscaped bio-filter along the east property line. The bio-filter will drain via storm drain pipe into an existing catch basin in De Portola Road. The developed drainage pattern remains virtually the same from existing to developed condition. II. PURPOSE OF STUDY This hydrology report is intended to support the precise grading, paving, and drainage plan for the proposed development. m. METHODOLOGY The hydrology report incorporates a CiviICADD/Civil Design Computer Program based on the Riverside County Flood Control and Water Conservation Rational Method Hydrology. This computer program requires input data for rainfall, soil type, type of development, and topographic data for the study area. Rainfall Data: Standard intensity-duration curve data generated from Plate D-4.1 of the Riverside County Flood Control and Water Conservation Rational Hydrology Manual for the Murrieta- Temecula & Rancho California area was used. Soil Type Data: The soil type was obtained from the Hydrologic Soils Group Map within the Riverside County Flood Control and Water Conservation Rational Hydrology Manual. A copy of this map is included within this report. Tvoe of Develooment: The project site is planned for a commercial office building facility. Therefore the hydrology report incorporates factors that generate discharges representing commercial type development. RDS & Associates 'lr Topographic Data: The Hydrology Map, Exhibit "A" defines the subareas and contains information used as the basis of generating the project hydrology study. RDS & Associates '7 a a . l\fnN\fV'i A9010l:lGAf-{ a~M~~.:I~~ ~ ~O.:l d'l1~ dnO~~ 51105 ~1~010~aAH N01J."N!lIS30 dnoll!l S110S " ,l.1I"ONn08 dnoll!l S'IOS ON393' 'I1~N'I1H~3d ~ o -, DOOS 133'; ~ 100 YEAR STORM ULTIMATE CONDITIONS , RDS & Associates / ::> . Riverside County Rational Hydrology Program CIVILCADD/CIVILDESIGN Engineering Software, (c) 1992 Rational Hydrology Study Dace: OS/25/05 Version 3.3 AREA A AND AREA B A'l'i:et>. D 100 YR FLOW DEPOT FILE ********* Hydrology Study Control Information ********** RANPAC Engineering Corporation, Temecula, CA - SIN 560 Rational Method Hydrology Program based 011 Riverside County Flood Control & Water Conservation District 1978 hydrology manual Storm event (year) ~ 100.00 Antecedent Moisture Condition 3 Standard intensity-duration curves data (Plate D-4.1) For the [ Murrieta,Tmc,Rnch CaNorco ] area used. 10 year storm 10 minute intensity ~ 2.360 (in./hr.) 10 year storm 60 minute intensity ~ 0.880 (in. /hr.) 100 year storm 10 minute intensity 3.480 (in./hr.) 100 year storm 60 minute intensity ~ 1. 300 (in. /hr.) . Storm event year = 100.0 Calculated rainfall intensity data: 1 hour intensity = 1.300 (in./hr.) Slope of intensity duration curve ~ 0.5500 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 1.000 to Point/Station 2.000 **** INITIAL AREA EVALUATION **** . Initial area flow distance ~ 650.000(Ft.) Top (of initial area) elevation ~ 74.400(Ft.) Bottom (of initial area) elevation = 65.800(Ft.) Difference in elevation ~ 8.600(Ft.) Slope = 0.01323 s(percent)= 1.32 TC = k(0.300)*[(length^3)j(elevation change)]^0.2 Initial area time of concentration = 9.505 min. Rainfall intensity 3.581(In/Hr) for a 100.0 year storm COMMERCIAL subarea type Runoff Coefficient ~ 0.890 Decimal fraction soil group A 0.000 Decimal fraction soil group B 1.000. Decimal fraction soil group C 0.000 Decimal fraction soil group D 0.000 RI index for soil(AMC 3) 74.80 Pervious area fraction ~ 0.100; Impervious fraction 0.900 Initial subarea runoff ~ 1.594(CFS) Total initial stream area 0.500(Ac.) (p Pervious area fraction 0.100 . ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 1.000 to Point/Station 2.000 **** CONFLUENCE OF MINOR STREAMS **** Along Main Stream number: 1 in normal stream number 1 Stream flow area = 0.500(Ac.) Runoff from this stream 1.594(CFS) Time of concentration 9.51 min. Rainfall intensity ~ 3.581(In/Hr) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 3.000 t.o Point/Station 4.000 **** INITIAL AREA EVALUATION **** Ini tial area flow distance = 215.000 (Ft.. ) Top (of initial area) elevation ~ 73.800(Ft.) Bottom (of initial area) elevation = 69.700(FL) Difference in elevation ~ 4.100(Ft.) Slope = 0.01907 s(percent)= 1.91 TC ~ k(0.300)*[(length^3)/(elevation change)]^0.2 Initial area time of concentration = :,.676 min. Rainfall intensity 4.756 (In/Hr) for a 100.0 year storm COMMERCIAL subarea type Runoff Coefficient = 0.892 Decimal fraction soil group A 0.000 Decimal fraction soil group B 1.000 Decimal fraction soil group C 0.000 Decimal fraction soil group D 0.000 RI index for soil(AMC 3) 74.80 Pervious area fraction = 0.100; Impervious fraction 0.900 Initial subarea runoff = 2.546(CFS) Total initial stream area 0.600 lAc. ) Pervious area fraction ~ 0.100 . ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++~+++++++++++ Process from Point/Station 4.000 to Point/Station 2.000 **** SUBAREA FLOW ADDITION **** COMMERCIAL subarea type Runoff Coefficient = 0.892 Decimal fraction soil group A 0.000 Decimal fraction soil group B 1.000 Decimal fraction soil group C 0.000 Decimal fraction soil group D 0.000 RI index for soi1(AMC 3) 74.80 Pervious area fraction ~ 0.100; Impervious fraction o. 'lOa Time of concentration 5.68 min. Rainfall intensity 4.756 (In/Hr) for a 100.0 year 13torm Subarea runoff 4.540(CFS) for 1.070(Ac.) Total runoff = 7.086 (CFS) Total area = 1. 670 (Ac.) . ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 4.000 1:0 Point/Station 2.000 **** CONFLUENCE OF MINOR STREAMS **** '1 . Along Main Stream number: 1 in normal st:ream number 2 Stream flow area ~ 1.670(Ac.) Runoff from this stream 7.086(CFS) Time of concentration ~ 5.68 min. Rainfall intensity = 4.756(In/Hr) Summary of stream data: Stream No. Flow rate (CFS) TC (min) Rainfall Intensity ( In/Hr) 1 2 Largest Qp = 1.594 9.51 7.086 5.68 stream flow has longer 7.086 + sum of Qa Tb/Ta 1.594 * 0.597 8.038 3.581 4.756 or shorter time of concentration 0.952 Qp ~ . Total of 2 streams to confluence: Flow rates before confluence point: 1.594 7.086 Area of streams before confluence: 0.500 1.670 Results of confluence: Total flow rate = 8.038(CFS) Time of concentration = 5.676 min. Effective stream area after confluence End of computations, total study area = The following figures may be used for a unit hydrograph study of the 2.170(Ac.) 2.17 (P.c.) same area. Area averaged pervious area fraction (Ap) Area averaged RI index number ~ 56.0 0.100 . <0 . Riverside County Rational Hydrology Program CIVILCADD/CIVILDESIGN Engineering Software, (c) 1992 Rational Hydrology Study Dat:e: OS/25/05 Version 3.3 AREA C 100 YR FLOW DEP ********* Hydrology Study Control Information ** *** ** * ** RANPAC Engineering Corporation, Temecu1a, CA - SIN 560 Rational Method Hydrology Program based or,. Riverside County Flood Control & Water Conservation District 1978 hydrology manual Storm event (year).~ 100.00 Antecedent l10isture Condition 3 Standard intensity-duration curves data (Plate D-4.1) For the [ Murrieta, Tmc, Rnch CaNorco ] ar,"a used. 10 year storm 10 minute intensity = 2.360 (in./hr.) 10 year storm 60 minute intensity = 0.880 (in./hr.) 100 year storm 10 minute intensity 3.480 (in./hr.) 100 year storm 60 minute intensity = 1.300 (in./hr.) . Storm event year ~ 100.0 Calculated rainfall intensity data: 1 hour intensity = 1.300 (in./hr.) Slope of intensity duration curve = 0.5500 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 1.000 to Point/Station 5.000 **** INITIAL AREA EVAlUATION **** Initial area flow distance = 172.000(Ft.) Top (of initial area) elevation ~ 74.400(Ft.) Bottom (of initial area) elevation = 72.690(Ft.) Difference in elevation = 1.710(Ft.) Slope ~ 0.00994 s(percent)= 0.99 TC ~ k(O.300)*[(length^3)/(elevation change)]^0.2 Initial area time of concentration ~ 5.913 min. Rainfall intensity 4.650 (In/Hr) for a 100.0 year storm COMMERCIAL subarea type Runoff Coefficient ~ 0.892 Decimal fraction soil group A 0.000 Decimal fraction soil group B 1.000 Decimal fraction soil group C 0.000 Decimal fraction soil group D 0.000 RI.index for soil(AMC 3) 74.80 Pervious area fraction = 0.100; Impervious fraction 0.900 Initial subarea runoff ~ 1.576(CFS) Total initial stream area 0.380(Ac.) . C\ . Pervious area fraction = 0.100 End of computations, total study area = 0.38 (Ac.) The following figures may be used for a unit hydrograph study of the same area. Area averaged pervious area fraction (Ap) Area averaged RI index number = 56.0 0.100 . . ~ . Riverside County Rational Hydrology Program CIVILCADD/CIVILDESIGN Engineering Software, (c) 1992 Rational Hydrology Study Date: OS/25/05 Version 3. 3 AREA E 100 YR FLOW ********* Hydrology Study Control Information uu*****. RANPAC Engineering Corporation, Temecu1a, CA - SIN 560 Rational Method Hydrology Program based ,m Riverside County Flood Control & Water Conservation District 1978 hydrology manual Storm event (year) = 100.00 Antecedent 110isture Condition 3 Standard intensity-duration curves data (Plate D-4.1) For the [ Murrieta,Tmc,Rnch CaNorco ] area used. 10 year storm 10 minute intensity ~ 2.360 (in./hr.) 10 year storm 60 minute intensity ~ 0.880 (in./hr.) 100 year storm 10 minute intensity 3.480 (in./hr.) 100 year storm 60 minute intensity ~ 1.300 (in./hr.) . Storm event year ~ 100.0 Calculated rainfall intensity data: 1 hour intensity = 1.300 (in./hr.) Slope of intensity duration curve = 0.5500 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 6.000 to Point/Station 7.000 **** INITIAL AREA EVALUATION **** . Initial area flow distance ~ 267.000(Ft.) Top (of initial area) elevation = 69.800(Ft.) Bottom (of initial area) elevation ~ 66. 700(Ft.) Difference in elevation = 3.100(Ft.) Slope = 0.01161 s(percent)~ 1.16 TC ~ k(0.300)*[(length^3)/(elevation change)]^0.2 Initial area time of concentration ~ 6.835 min. Rainfall intensity 4.293(In/Hr) for a 100.0 year storm COMMERCIAL subarea type Runoff Coefficient = 0.891 Decimal fraction soil group A 0.000 Decimal fraction soil group B 1.000 Decimal fraction soil group C 0.000 Decimal fraction soil group D 0.000 RI index for soi1(AMC 3) 74.80 Pervious area fraction ~ 0.100; Impervious fraction 0.900 Initial subarea runoff = 1.l10(CFS) Total initial stream area 0.290(Ac.) 'i\ . Pervious area fraction = 0.100 End of computations, total study area = 0.29 (Ac.) The following figures may be used for a unit hydrograph study of the same area. Area averaged pervious area fraction (Ap) Area averaged RI index number = 56.0 0.100 . . \'Z-- . . 10 YR FLOW i. \~ . Riverside County Rational Hydrology Program CIVILCADD/CIVILDESIGN Engineering Software, (c) 1992 Rational Hydrology Study Date: OS/25/05 Version 3.3 AREA A AND AREA B - /o.r<.6p... t? 10 YEAR FLOW * *'**** * * * Hydrology Study Control Information * ** ** ** **. RANPAC Engineering Corporation, Temecula, CA - SIN 560 Rational Method Hydrology Program based <or, Riverside County Flood Control & Water Conservation District 1978 hydrology manual Storm event (year) = 10.00 Antecedent Hoisture Condition 3 Standard intensity-duration curves data (Plate D-4.1) For the [ Murrieta,Tmc,Rnch CaNorco ] area used. 10 year storm 10 minute intensity ~ 2.360 (in./hr.) 10 year storm 60 minute intensity ~ 0.880 (in./hr.) 100 year storm 10 minute intensity 3.480 (in./hr.) 100 year storm 60 minute intensity = 1.300 (in./hr.) . Storm event year = 10.0 Calculated rainfall intensity data: 1 hour intensity = 0.880 (in./hr.) Slope of intensity duration curve ~ 0.5500 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 1.000 to Point/Station 2.000 **** INITIAL AREA EVALUATION **** Initial area flow distance = 650.000 (Fi:.T Top (of initial area) elevation = 74.400(Ft.) Bottom (of initial area) elevation = 65.800(Ft.) Difference in elevation = 8.600(Ft.) Slope ~ 0.01323 s(percent)= 1.3, TC ~ k(0.300)*[(length^3)/(e1evation change)]^0.2 Initial area time of concentration = 9.505 min. Rainfall intensity 2.424 (In/Hr) for a 10.0 year storm COMMERCIAL subarea type Runoff Coefficient = 0.886 Decimal fraction soil group A 0.000 Decimal fraction soil group B 1.000 Decimal fraction soil group C 0.000 Decimal fraction soil group D 0.000 RI index for soi1(AMC 3) 74.80 Pervious area fraction = 0.100; Impervious fraction 0.900 Initial subarea runoff ~ 1.074(CFS) Total initial stream area 0.500(Ac.) . \'\ Pervious area fraction 0.100 . ++++++++++++++++++++++++++++++++++++++++'~4'++++++++++++++++++++++++++++ Process from Point/Station 1.000 to Point/Station 2.000 **** CONFLUENCE OF .MINOR STREAMS **** Along Main Stream number: 1 in normal stream number 1 Stream flow area = 0.500(Ac.) Runoff from this stream 1.074(CFSI Time of concentration 9.51 min. Rainfall intensity ~ 2.424(In/Hr) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++~+++++++++++ Process from Point/Station 3.000 cO Point/Station 4.000 **** INITIAL AREA EVALUATION **** Initial area flow distance ~ 215.000(F~.) Top (of initial area) elevation = 73.800(Ft.) Bottom (of initial area) elevation = 69.700(Ft.) Difference in elevation = 4.l00(Ft.) Slope = 0.01907 s(percent)~ 1.91 TC = k(0.300)*[(length^3)/(e1evation change)]^0.2 Initial area time of concentration = 5.676 min. Rainfall intensity 3.219 (In/Hr) for a 10.0 year storm COMMERCIAL subarea type Runoff Coefficient = 0.889 Decimal fraction soil group A 0.000 Decimal fraction soil group B 1.000 Decimal fraction soil group C 0.000 Decimal fraction soil group D 0.000 RI index for soi1(AMC 3) 74.80 Pervious area fraction = 0.100; Impervious fraction 0.900 Initial subarea runoff ~ 1.717(CFS) Total initial stream area 0.600(Ac.) Pervious area fraction = 0.100 . ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 4.000 to Point/Station 2.000 **** SUBAREA FLOW ADDITION **** COMMERCIAL subarea type Runoff Coefficient = 0.889 Decimal fraction soil group A 0.000 Decimal fraction soil group B 1.000 Decimal fraction soil group C 0.000 Decimal fraction soil group D 0.000 RI index for soil(AMC 3} 74.80 Pervious area fraction = 0.100; Impervious fraction 0.900 Time of concentration 5.68 min. Rainfall intensity 3.219(In/Hr) for a 10.0 year storm Subarea runoff 3.062(CFS) for 1.070(Ac.) Total runoff ~ 4.779 (CFS) Total area ~ 1.670 (Ac.) . ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 4.000 to Point/Station 2.000 **** CONFLUENCE OF MINOR STREAMS **** \-> . Along Main Stream number: 1 in normal stream number 2 Stream flow area = 1.670(Ac.) Runoff from this stream 4.779(CFS) Time of concentration ~ 5.68 min. Rainfall intensity = 3.219(In/Hr) Summary of stream data: Stream No. Flow rate (CFS) TC (min) Rainfall Intensity (In/Hr) 1 2 Largest Qp = 1.074 9.51 4.779 5.68 stream flow has longer or 4.779 + sum of Qa Tb/Ta 1.074 * 0.597 5.420 2.424 3.219 shorter time of concentration 0.641 Qp ~ . Total of 2 streams to confluence: Flow rates before confluence point: 1.074 4.779 Area of streams before confluence: 0.500 1.670 Results of confluence: Total flow rate = 5.420(CFS) Time of concentration = 5.676 min. Effective stream area after confluence End of computations, total study area ~ The following figures may be used for a unit hydrograph study of the 2.170(Ac.) 2.17 (Ac.) same area. Area averaged pervious area fraction (Ap) Area averaged RI index number ~ 56.0 0.100 . \'0 . Riverside County Rational Hydrology Program CIVILCADD/CIVILDESIGN Engineering Software, (c) 1992 Rational Hydrology Study Date: OS/25/05 Version 3.3 AREA C 10 YR FLOW ********* Hydrology Study Control Information ********H RANPAC Engineering Corporation, Temecu1a, CA - SIN 560 Rational Method Hydrology Program based on Riverside County Flood Control & Water Conservation District 1978 hydrology manual Storm event (year) = 10.00 Antecedent Moisture Condition 3 Standard intensity-duration curves data (Plate D-4.1) For the [ Murrieta, Tmc, Rnch CaNorco ] arE,a used. 10 year storm 10 minute intensity ~ 2.360 (in. /hr.) 10 year storm 60 minute intensity ~ 0.8aO (in. /hr.) 100 year storm 10 minute intensity 3.',80 (in. /hr.) 100 year storm 60 minute intensity ~ 1.300 (in./hr.) . Storm event year = 10.0 Calculated rainfall intensity data: 1 hour intensity = 0.880 (in./hr.) Slope of intensity duration curve = 0.5500 +++++ + ++ +++ +++ + ++++++++++ ++ ++ + +++++++++ +,- + + ++ ++++++ ++ ++ + ++++ + + + + +++++ + Process from Point/Station 1.000 to Point/Station 5.000 **** INITIAL AREA EVALUATION **** . Ini tial area flow distance = 172.000 (Ft. ) Top (of initial area) elevation = 74.400(Ft.) Bottom (of initial area) elevation = 12.690(Ft.) Difference in elevation ~ 1.710(Ft.) Slope ~ 0.00994 s(percentl~ 0.99 TC ~ k(0.300)*[(length^3)/(elevation change)]^0.2 Initial area time of concentration = 5.913 min. Rainfall intensity 3.147(In/Hr) for a 10.0 year "torm COMMERCIAL subarea type Runoff Coefficient ~ 0.889 Decimal fraction soil group A 0.000 Decimal fraction soil group B 1.000 Decimal fraction soil group C 0.000 Decimal fraction soil group D 0.000 RI index for soil(AMC 3) 74.80 Pervious area fraction ~ 0.100; Impervious fraction 0.900 Initial subarea runoff = 1.063(CFS) Total initial stream area 0.380(Ac.) \"\ . Pervious area fraction ~ 0.100 End of computations, total study area ~ 0.38 (Ac.) The following figures may be used for a unit hydrograph study of the same area. Area averaged pervious area fraction (Ap) Area averaged RI index number ~ 56.0 0.100 . . \'2> . Riverside County Rational Hydrology Program CIVILCADD/CIVILDESIGN Engineering Software, (c) 1992 Rational Hydrology Study Dat:e: OS/25/05 'version 3.3 AREA E 10 YR FLOW ********* Hydrology Study Control Information ********** RANPAC Engineering Corporation, Temecula, CA - SIN 560 Rational Method Hydrology Program based on Ri verside County Flood Control & Water Conservation Distri::t 1978 hydrology manual Storm event (year) = 10.00 Antecedent 110isture Condition 3 Standard intensity-duration curves data (Plate D-4.1) For the [ Murrieta,Tmc,Rnch CaNorco ] area used. 10 year storm 10 minute intensity = 2.360 (in./hr.) 10 year storm 60 minute intensity = 0.880 (in./hr.) 100 year storm 10 minute intensity 3.480 (in./hr.) 100 year storm 60 minute intensity ~ 1.300 (in./hr.) . Storm event year ~ 10.0 Calculated rainfall intensity data: 1 hour intensity = 0.880 (in./hr.) Slope of intensity duration curve ~ 0.5500 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 6.000 to Point/Station 7.000 **** INITIAL AREA EVALUATION **** Initial area flow distance = 267.000(Ft.) Top (of initial area) elevation = 69.800 (Ft. ) Bottom (of initial area) elevation ~ 66.700(Ft.) Difference in elevation = 3.100(Ft.) Slope ~ 0.01161 s(percent)= 1.16 TC = k(0.300)*[(length^3)/(elevation change)]^0.2 Initial area time of concentration = 6.835 min. Rainfall intensity 2.906(In/Hr) for a 10.0 year storm COMMERCIAL subarea type Runoff Coefficient = 0.888 Decimal fraction soil group A 0.000 Decimal fraction soil group B 1.000 Decimal fraction soil group C 0.000 Decimal fraction soil group D 0.000 RI index for soil(AMC 3) 74.80 Pervious area fraction ~ 0.100; Impervious fraction 0.900 Initial subarea runoff ~ 0.748(CFS) Total initial stream area 0.290(Ac.) . \'\ . Pervious area fraction = 0.100 End of computations, total study area ~ 0.29 (Ac.) The following figures may be used for a unit hydrograph study of the same area. Area averaged pervious area fraction (Ap) Area averaged RI index number ~ 56.0 0.100 . . 2D . tzJ~ r'. ~z !"!=' Ol ~ tzJz roo ~.... oJ>. ;p..ll:' . 8~ .a a c ~ ~-; ~ il "'s ~ n 8 ~ ;, II I I I ~ - i ~ ~ " I ;; ~ ~ I - n I ~ . ~ (D~ , , ~H : I f p 8~ I · g~ f J ,~~ i · i · I . E II I It · ri-l . t"" II .... o ~ g ::fI &.i z ~ I I I I t:;j ~ tzJ tll o I (ffi ~I > l;) l;) tzJ tzJ t:;j ~ &l tzJ - > ~ >~ ("l - . 0 .......z OJ i ~ " ~ I) ~~ ~ a~ ~ ~;" '" ~~ iU .... ~'" ~ I - , - ~