HomeMy WebLinkAboutCUP 12-08; Palomar Place Retail Center; Site Development Plan (SDP) (3)I
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HYDROLOGY/HYDRAULICS CALCULATIONS
FOR
PALOMAR PLACE RETAIL CENTER
PALOMAR AIRPORT ROAD
CARLSBAD, CA 92011
Prepared Fo:r:
CLINT FOWLER
Lusardi Construction
1570 Linda Vista Dr.,
San Marcos CA 92078
JN 12-017
August 28, 2012
48592
' . : ._._..
J-4 -IZ
~-----= ,.~ ~~~----~"--· DATE
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TABLE OF CONTENTS
l.SITE DESCRIPTION
2.HYDROLOGY DESIGN MODELS
3.HYDROLOGIC CALCULATIONS .......................... APPENDIX A
4.TABLES AND CHARTS ................................ APPENDIX B
5 . HYDROLOGY MAPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . APPENDIX C
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1. SITE DESCRIPTION
THE PROJECT HAS BEEN PREVIOUSLY IMPROVED AND WE ARE NOT
ADDING MORE IMPERVIOUS AREA, THEREFORE THE EXISITNG AND
PROPOSED CONDITION WILL HAVE THE SAME "C" FACTOR OF 0.95.
THERE WILL BE NO INCREASE ON RUNOFF, THEREFORE NO IMPACT ON
THE DOWNSTREAM; FURTHERMORE WE WILL BE PROPOSING BIORETENTION
BASINS THAT WILL HELP INFILTRATE AND TREAT RUNOFF GENERATED
ON SITE.
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2. HYDROLOGY DESIGN MODELS
A. DESIGN METHODS
THE RATIONAL METHOD IS USED IN THIS HYDROLOGY STUDYi THE RATIONAL
FORMULA IS AS FOLLOWS:
Q -CIA, WHERE : Q= PEAK DISCHARGE IN CUBIC FEET/SECOND *
C = RUNOFF COEFFICIENT (DIMENSIONLESS)
I = RAINFALL INTENSITY IN INCHES/HOUR (PER APPENDIX XI-A)
A = TRIBUTARY DRAINAGE AREA IN ACRES
*1 ACRE INCHES/HOUR= 1.008 CUBIC FEET/SEC
THE NATURAL WATERSHED METHOD IS ALSO USED IN THIS HYDROLOGY STUDYi
THE NATURAL WATERSHED FLOW FORMULA IS AS FOLLOWS:
B.
c.
Tc=1. 8 (1.1~C) (L) .s / [S (100)] ·333
L OVERLAND TRAVEl, DISTANCE lN FI!:E'l'
S ~ SLOPE IN FT,/FT.
Tc= TIME IN MINUTES
DESIGN CRITERIA
-FREQUENCY, 100 YEAR STORM.
-LAND USE PER SPECIFIC PLAN.
-RAIN FALL INTENSITY PER COUNTY OF SAN DIEGO 2003 HYDROLOGY
DESIGN MANUAL.
REFERENCES
-COUNTY OF SAN DIEGO 2003, HYDROLOGY MANUAL.
-COUNTY OF SAN DIEGO 1992 REGIONAL STANDARD DRAWING.
-HAND BOOK OF HYDRAULICS BY BRATER & KING, SIXTH EDITION.
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APPENDIX A
(3. HYDROLOGIC CALCULATIONS)
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Project Name:
Project Location:
APN:
K & S Project No:
"C" FACTOR=
AREA BASIN 1 (AC) =
AREA BASIN 2 (AC) =
AREA BASIN 3 (AC) =
AREA BASIN 4 (AC) =
P6=
DURATION (D) MIN.=
INTENSITY (IN/HR) =
1=7.44 P6 0"0.645
BASIN 1
BASIN 2
BASIN 3
BASIN 4
TOTALS
CONCEPTUAL HYDROLOGY
PALOMAR RETAIL CENTER
PALOMAR AIRPORT ROAD, CARLSBAD CA
211-040-34-00
12-017
0.95
0.48
0.35
0.54
0.67
2.5
10
4.21
O=CIA
Date:
c I A TOTAL RUNOFF (CFS)
0.95 4.21 0.48 1.92
0.95 4.21 0.35 1AO
0.95 4.21 0.54 2.16
0.95 4.21 0.67 2.68
2.04 8.16
7/3/2012
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I APPENDIX B
{4. TABLES AND CHARTS)
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-------------------HTTTfl ;·:·lilllflffiTI !Ill !li!ii!ll!illll i!l i I ! ! ; ! ' ! !I! I! Ill! EQUATION I = 7.44 Pe o-0.645 mnm ~' ~~ 1 1~1NHHIIII!IIIIIII\IIIllllll! = lntensity{lnfhn . 11 Ps = 6-Hour Preaipitatson (In} ~~J-4,~d:J~l-fl-l~~~iet~lliftttffiftil 0 = Duration (min} ~0 I 3.0 12.5 I l ~ 2.0 H i 1.5 0.2 -;-i i '• 1.0 '-+-1-4-+++-1-1-+ t -r--IIIII! H=+Itmil 1c = 20 m'"ijlltlUliUijff~--h-~ffiE~! 0.1 ffillijri ffl ! llllllfu1ffi1umtt~l i l T~ I I lllt I . 5 6 7 8 9 10 15 20 30 40 50 ~ 2 1 il 5 s Minutes HOUrS Ouratio lntensfty .. Ouratlon Design thari a Example 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 line through the point parallel to the plotted lines. (5) This line is the Intensity-duration curve for the location being analyzed. Application Fonn: Note: This Chart replaces the lntenslty~Ouration-Frequency curves used since 1965. Pli ·-----=----1--r,.s 1 ;l ·;··2.5 3 a.s: <~ · .-.s · s ··r-s.s , s -·Duration; t--~ r :··--i , --i-; t -"-n ·i ···· f ; ,. :--r -:-·, ----5 2.63 13.95r.27~!-i9.!..?~~-9.2,2i 1_!).5-4_:_t_!:._~~-13.171 ~~-911_?.8! .... 7 :2.1~..13..!! -~~ ~.:JO l!~l_T.-4:!!. ~.48 ;. ~·~.,, 1t;1@9.1!1.t611~12 -10 1.88 12.5! 3.37 4.2tl5.05l5.901 6.74: 7.58 8.42] 927 110.11 i, ____ ...!~ .1.30 tus(2.ssl. s.2".·~ 3.89!45.4T5.1!i 1"S:84D;.~v r;. ~-lf!.I au _1.oe.J:~12.,1s 2.~_ir_!_-?a~.J714.3t • .us i s!~s.93 ~-!! L 25 ..... _Q_.93 1~~L1.87_!tJ. _2._~J2·~-i3.27l3-?314~~ L~·~ .• 5~_t3J !'·!Ill. ~-30 o.ll3 t24f1.ee12.0712.4~;-~·ool. ~-;J2.L;i,1! , __ 4.1~ !-""'saj'· 4.98 -._ _____ .~ ~.6.9 u .03 , .381 1.12 r 2.01. 2.41[ 2.1e 1 ~.-to 1 a.4s '-~--!.? ... __ ,;t_ so _o.so .!..MO 1_,_1~~~-lll!79; ~~O!L2.~.L~·!?..I ~·S!L~~-l\1?8 10 0.53 !0.80 1,06, 1.33i1.59•l.8612.12 •2.3912.85!2.021 3.18 ~ ·-ao o.4f'JQ;i1 ~ap ·f~fj.:23.f.t.4~l JS3.;._ut.l.~04:~ 2~ 12.·~· ____ '2! o~~JM~ o.sa!o.as,1.02i~-19~. ~::36, '~~-P·Z9. J~ 1 ~-04 ...J!!! 0~ 11?,.:44 _9,59~_9-?~.!.0.88{~-0:Ji 1.18; 1,~ 1 1,47: 1.&2 1 1.7~ ......... J.~ Q-:!6~.30 .o.~ o.asJo.7a. ~.91 u .. 0:-4:.! 1_. II!., .1-:.3.L. t-1.:"-.,.U t.s1 2 0.22 0".33 0.43 0.54!0.65'0.76 0.87 I 0.981 UJI f ~.19 1.30 ,_ 30ii (),i~1Q..~ 0.38. ~;!r1o.~lo.-~st o:?.sj o:~s i ~9£H-.O:i l.fa ; 360 0.17 0.2! 0.3310.-4210,5010.581 0.67 i 0.75 0.154. O.RTf.OO FIG·URE l I I 1 l I ! A I 11:1 l. •• ··-----~ .. __________________ ........... ...
• ---i I . ~-:-1 ' : ! ·-! 1-: ~----f .. f :--~-} --~ j. j -j .. ; ------~-; I ,_H -!-1; :_~; ..... ; I li::: I : : ~_;. ~ i l :-·r I I' ! i. -1f lq> :;;::: --:--i:D !fl .:o ;.....~ I -,! -i' '! --t ! -!: I _,_, ;fl :~!. k '. I --i .U ;tl : ·;! ----"l . ri I I f'"T i I I I -. 11 --t ' : ! : I i I i i n:·-j•m(n . i rl : ! ! ' -~ ·i-' I County of San Diego Hydrology Manual I l I I I I I' ! r I_ I l~t: '11 !h I I : !tl 'I . I ! ' ;_;; r~H i'l i ! ! ~~-rfl~~~~~~~~tl:t~~~~~~~~~t1~~jt1-~~tt~~=r~~~~~~~~~f1~!1~~~~~~~~t!~~~~~r=~!j[j ! ) :! I l. ' '~ :~ !ij !~ RaiY!fall Isopluvials 100 Year Rainfall Event-6 Hours L.;._J I --·'· l ~.;.:I :tl::! r-+ 1 r-f--· · !'i!~+ r.~ l I I. I I ! l'' i I "!·1 I I I ! if ..... "'r'll Jll.-TT!,eJ;1 ! ... · i l r~··r ~p . : r: .. !-!· I .: ,! i ! r _t ! i r-· ··-· : i : , .. ·,··l"'-j i ! f ,-i l. ; ... j·j· j l i I i j . i i' I i I i I ! i I I ! . II I i i' [: :Ji+ft: ii4i ~~' :; . i -;---1 : ! : ~ ; ;-~-! : :--r ; ,, !!i I '~ l,j '" ~~ I~ --l ~~ I •· i~ : ~~ lsopluvial (inches) I ;:..J....! I 1 il~fx;qt.ji 1 1• :J ;i3t"~s!l:l• ., lit! 1' ·1 ·-.-; i . . I I ; ! . -i Ill t;:~1r;t!ftt-P:tt-t~9::ti~~tf+4~~\-+--;-B-:H+~4'-;11~:W+W-i!_:_LJ! li ' . lk /·· ; •I I '12i45'· .: .... ~ '.. ! ~;: ·-jr=~,._-~-----.f i I I ~-~!! i ; ~ : : ! I . ' ! ·+ : '" .. Li : .. ; ·; :i.l iLl·-;;: :ll. I I ·; 1 i . I '-I--f .. +..l . '. I I I I "'f'T I . ! : ! j i I ! j t~·i _; ! ; : i !Tij • ·-xi [, ·: , · !--: -.... ! ··1•. I I I I. I I I ,., .. ;.11 ' I I' ---r-1. . ' "f, ' i ! : : : u : : ; ' : i rr: : d : ~'-c. : i i • I ' I : ! :r I II I • ' i ! ' ""-. ' ' i bHet--; ' , ~ ; · : _r ' , : ; !:!~~~·:·'pt~-: ·-;-:~ , •. L . ' " ' . ; I " ' ' . ' " ' I " ii ., : ' • " ""' 1~' f-'rt::: :u: ::Cui : . i~!: ~u: l.':ilf' n : i • :r . ' !ii tt.t '; ,. ' f ~ ' j I '1', I ·r ....... "' • ;,: : .. I. \ i il ·\Iii .. j I ~ ·~ H • -GIS ··--dl':tU.G.\'' . . ..... ,. ~ ..... , " ....... w· . ~_,ii\~'::' ..:o. H .... , 5:rn Di..-gn l.tM.:J ........ If! ·ll N ntst»PJIO~wmtouTW#dt.\NTYOI'IHfiCMJ,BTHERECPAESS ! 01'1.4EncHAHT....-.m'AtC1fmUSJIOI'IAPAAT!CllAAf>t..v .....£. • c .. oilanGO.~~;......r .:. ; : i -1 W ~-~ nsrswn.,~~M~t. ~~•• i! !1 11ik~' "W. 111\tlkl•"-... ~,r .. ; ... i~.._· ......l.-i-W.-.-' + OftN"UU!D.tiQ..l.!OttCJ.-.Il'NafL..-nroTO,"'ltt!l' ... UBlW,~ .. ~-.HtlES ! i , :~ Thl:~"'_,,.._._,. .. ,,,_~~r,.,n..aA-.-... ! • • i I I I ' . -i i . ! i I •. I • lVTh .... ,, ...... ,· I :,,!t\: i !32TsP '" s 'I ! i: . .J .. J ... i. !---+ ··'·b-. If"'' ·~ .. : ! !e : ! ; I! i ·~' I I! .!. 1 iw ~ • ! l :ill 3 0 3 Miles
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I APPENDIX C
I (5. HYDROLOGY MAP )
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T--' .. GRAPHIC SCALI:
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A MA A fir-" A
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BASIN 1
0.48 AC
BASIN 2
0.35 AC
BASIN 3
0.54 AC
BASIN 4
0.67 AC
VICINITY MAP