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HomeMy WebLinkAboutCDP 16-18; Rancho Paradiso; Hydrology/Drainage Report; 2017-02-28) I I --. HYDROLOGY/ DRAINAGE REPORT FOR RANCHO PARADISO 250 & 252 NORMANDY LANE, CARLSBAD, CA 92008 APN 203 -023 -04 CDP16-18, CDP16-19, AV16-03 DWG 500-1A / GR2016-0053 DEV 16022 Prepared For Gary and Sandy Barberio P.O. Box 4221 Carlsbad, CA 92008 Prepared By Robert Sukup The Sea Bright Company 4322 Sea Bright Place Carlsbad, CA 92008 760 -720 -0098 February 28, 2017 . 1 c ,. r ; \ 0 /_' LJ I ( LAND DEV=~L_CFMENT SO\L ::,y{)E. A -COU~iY HYDROC...OG\C. :SOil.. t-'\A p SHE.E.. T -# Z.Z. -~ S"At,.t \...\J\ ~ 'Rt:.'/ 1 > % It/\ Pe,.Y<_\/\005 " ~!:,¾ c.:. &,f.o ls~l:. 1'A\3L'E. 3-\ AnAc1-lt:.b) I.:: 1:,,5 ( se.e FtG\JRc "3-\ AiTAc\4E-0) Q.) CIA ,~~ ~A\"-\ ?\JR f>OS\:. OF -n-HS ST<J'D'/ 15 To MA\<f. ~URS Tt-\E.. DRA)LI PIP€.~ CAIJ. 1.JANOLE 7Ht-FC..()U} DRA..\N.A(£ AR~As St.S I\, 1" f\C ~Eb ~X H l ~ r1 A-l ..: , OOb(o Ac.{2.~o:; · Q~ C ]A~ ,0,~ ,.s '<. 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San Diego County Hydrology Manual Date: June 2003 Table 3-1 Section: Page: RUNOFF COEFFICIENTS FOR URBAN AREAS Land Use Runoff Coefficient "C" Soil TyPe NRCS Elements Countv Elements % IMPER. (A) B Undisturbed Natural Terrain (Natural) Pennanent Open Space O* 0.20 0.25 Low Density Residential (LDR) Residential, 1.0 DU/ A or less 10 0 :7 0.32 Low Density Residential (LOR) Residential, 2.0 DU/A or less 20 0.34 0.38 Low Density Residential (LDR) Residential, 2.9 DU/A or less 25 0.38 0.41 Medium Density Residential (MDR) Residential, 4.3 DU/A or less 30 0.41 0.45 Medium Density Residential (MDR) Residential, 7.3 DU/A or less 40 0.48 0.51 Medium Density Residential (MDR) Residential, 10.9 DU/A or less 45 0.52 0.54 Medium Density Residential (MDR) Residential, 14.5 DU/A or less 50 0.55 0.58 High Density Residential (HDR) Residential, 24.0 DU/ A or less ® ~ 0.67 High Density Residential (HDR) Residential, 43.0 DU/A or less 80 0.76 0.77 Commercial/Industrial (N. Com) Neighborhood Commercial 80 0.76 0.77 Commercial/Industrial (G. Com) General Commercial 85 0.80 0.80 Commercial/Industrial (O.P. Com) Office Professional/Commercial 90 0.83 0.84 Commercial/Industrial (Limited I.) Limited Industrial 90 0.83 0.84 Commercial/Industrial (General I.) General Industrial 95 0.87 0.87 C 0.30 0.36 0.42 0.45 0.48 0.54 0.57 0.60 0.69 0.'.78 0.78 0.81 0.84 0.84 0.87 3 6 of26 D 0.35 0.41 0.46 0.49 0.52 0.57 0.60 0.63 0.71 0.79 0.79 0.82 0.85 0.85 0.87 *The values associated with 0% impervious may be used for direct calculation of the runoff coefficient as described in Section 3.1.2 (representing the pervious runoff coefficient, Cp, for the soil type), or for areas that will remain undisturbed in perpetuity. Justification must be given that the area will remain natural forever ( e.g., the area is located in Cleveland National Forest). DU/A= dwelling units per acre NRCS = National Resources Conservation Service 3-6 County of San Diego Hydrology Manual Rainfall Isopluvials 100 Year Rainfall Event -6 Hours lsopluvial (inches) I)PW ~GIS ~~ o.,.,,.,..,..;l'l'A!t;\l::tlOI 1Jr:••,,,,,.,.,.~ .... .,.,.~.,,,.. lHIS W.P IS PROVIDED WITHOUT WARRANTY OF ANY Klt«l. EIT~ EXPRESS ORll,IPIJW, ll,ICLUOING. BUT HOT LIMITED TO, THI! !Mf'LIEO WARMNtlES OF MERCHANTAIIIUTY ANO FtrNe8S FOR A PARTICULAR PURPOSE. eee,,.lgl,ISlftGIS.,l,IRigl,11R11Hrved. Thlspn:,dqcta 11111ycorair, lnlolfflaflar,lrOl!lth1 SANDAG Rog/o,,al W...mafictnS)'Sttfllll'hicl,C6't1101bllr~~l!l<I .,.,.;u1n ,,.,....,.,Ion o1 SANOAG. Thlsp,odudmay-1~ .,r-flkln--'*"hath~"~d"'1!h r>errniHiongron1NbyThoms18,olll.r6Mal)!. 3 Miles I County of San Diego Hydrology Manual Raiefall lsopluvials 100 Year Rainfall Event -24 Hours lsopluvlal (Inches) N Twt$ MA.PIS PAOW)ED WflHOUT WAAIVMYOF At« KIND, EITHER EXPRESS 4 E ORIUPUED.111/ClUOING,SUTHOTUMITEOTO,TlfEWPLll!DWARAANTIES Of MERCHJ.NTMIUTY AHO FITNESS FOR A PAl'l.'ftCIMR ,-UR!'()SI!. Copy,lglt!SllftGIS • .-aRJ;hl•RlfffVO<I. TNlpn:,d11CUmayeonlainlnl'Offfl•lonhomlh66,oJ>,1DAORe,g""'II lnlorma11Qf1$pl-whk:h-be,-,,~wtt1,out11,e wnllon .,.,,,,1a11onolSANOAG. Tl'll•product""'r,ea,,1.an1nrc:rm111on..+.1chhHb~e,,,e,,.c,dY<ftd°Mlh J111m"lls!lalgl'llfflld171'Thoma!B,01herst.t,p1. s 3 0 3 Miles - " ' 2.0 I ~ 'C' ~ 0 1 c1-0 i ~0.9 ! )!0.8 fo.1 0.6 0.5 0.4 0.3 0.2ft I . -I l i 0.1 5 6 7 8 9 10 ~ r ~r ~ ~ ~~ i ~ r I r~~ ~~ ~ ~ 1.5 -• : " ' "'" Ill!! ~1.0 I --H-" i --·-I f ffiffi H-I i --. I -I l I r 11 15 20 30 40 50 1 2 3 4 5 6 Minutes Hours Duration Intensity-Duration Design Chart -Template Directions for Application: (1) From precipitation maps determine 6 hr and 24 hr amounts for the selected frequency. These maps are Included 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 45% to 65% of the 24 hr precipitation (not applicaple to Desert). (3) Plot 6 hr precipitation on the right side of the chart. (4) Draw a lfne through the point parallel to the plo1ted lines. (5) This line is the intensity-duration curve for the location bei· '":lyzed. Applicatl.on Form: {a) Selected frequency .tl!Q_ year p ,.. (b) P5 = 2,t; in. P24 = 4,5 _§_ = $.~ %(2) ---• -~-·p - -? r: 24 {c) Adjusted p6<2l = _,._,::,_in. (d) tx = _5_ min. (e) I = ~ in./hr. Note: This chart replaces the lntensity-Ouration-Frequency curves used since 1965. 3-1