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HomeMy WebLinkAboutCDP 02-56; WALTERS RESIDENCE; DRAINAGE STUDY; 2002-08-14I I. I: I~ I I. :1 I, I: I I I I: I I I 1: I ·1 DRAINAGE STUDY FOR WALTERS RESIDENCE Job No. 02-1047 November 19, 2002 Revised August 14; 2003 Prepared by: O'DAY CONSULTANTS, INC. 2710 Loker Avenue West Suite 100 Carlsbad, California 92008-6603 Tel: (760) 931-7700 Fax: (760) 931-8680 RCE 32014 I I I I I I I I I I I I I I I I I 1· I TABLE OF CONTENTS SECTION 1 HYDROLOGY AND HYDRAULIC STUDIES FOR ON-SITE SYSTEM INTRODUCTION SECTION2 SECTION3 Purpose of Study Scope STUDY AREA Soils Groups Land Uses HYDROLOGY Rational Method CONCLUSION Related Material Summary Vicinity Map Runoff Coefficients Urban Areas Overland Time of Flow Curves Intensity-Duration Design Chart Isopluvial Maps 100-Year, 6-Hour 100-Year, 24-Hour Hydrology 100 year Analysis - Existing Conditions I I I I I I I I I I I I I I I. I I I I SECTION 4 SECTIONS SECTION6 Hydrology 100 year Analysis - Proposed Conclitions Analyze Capacity of Inlets Exhibit A Exhibit B On-Site Drainage Map -Existing Conditions On-Site Drainage Map --Proposed Conditions W:\MSOFFICE\WINWORD\021047\Rev. Drainage Study.doc I I I I I I SECTIONl I I I I . I I I I I I I I I ·1 I ·1 I I I I I I I I I I I I I I I I INTRODUCTION The Walters Residence is located at 5305 Carlsbad Boulevard in Carlsbad, California. A site visit was performed and the existing conditions are as follows: At the Nortp.erly portion of the property, a 4-in pipe was located at the base of slope and in the middle of the site at the base of the slope 2-6 in pipes were located, Water was poured on-site and the existing pipes picked up this surface water. At the Southerly portion of the site, no existing· inlets were observable at the base of slope. We will be tying into both of these pipe systems to drain our proposed area. Purpose of Study This drainage study was prepared to determine the runoff quantities fer our site. Scope This study analyzes the 100-year flow for the existing and ultimate condition of the proposed site. STUDY AREA Soils Groups For on-site conditions, soil type A was used. Land Use For on-site conditions, single family land use was utilized for the entire site. HYDROLOGY The rational method for storm water runoff was used for this study according to the County of San Diego Hydrology Manual and Design Procedure Manual and the City of San Diego Drainage Design Manual. · Rational Method Description The rational method, as described in the 1985 San Diego County Flood Control/Hydrology Manual, is used to estimate surface runoff flows, which are then used to size both permanent and temporary drainage and desiltation facilities. The basic equation: Q = CIA I I I I I I I I I I I I I I I I .I I I C == runoff coefficient (varies with surface) I = intensity (varies with time of concentration) A = area in acres The design storm for this project is the 100-year event; the corresponding 6-hour rainfall amount is 2.6 inches. CONCLUSION We analyzed the on-site Storm Drain system and based on our results we concluded that: For existing conditions: For proposed conditions: Area A = 0.17 cfs Area B = 0.45 cfs Area C = 0.44 cfs Total Q = 1.34 cfs Area 1 = 0.22 cfs Area 2 ~ 1.12 cfs Total Q = 1.34 cfs I I I I I I SECTION2 I I 1. I I .I . ·I I I I I I I I -··· . I ·1 I I I I I I I I 1· I I I I I I I SITE. •' PAOAC OCEAN CITY OF ENCINITAS . . VICINITY MAP NO SCALE NOT TO SCALE I I I I :I I I I I I I I ·1 I I I I I I RUNOFF COEFFICIENTS (RATIONAL METHOD) LAND USE Undeveloped Residential: Rural Single Family Multi-Units Mobile Hornes (2) Commercial (2) 80% Impervious Industrial (2) 90% ·impervious NOTES: Coefficient, C Soil Group ( 1) A B C • 30 . 35 . 40 • 30 -... • .:>:> .40 ®· .45 .so .45 . 50 . 60 .45 . 50 .55 • 70 . 7~ .80 . 80 .85 .90 D .45 . -l.3 .55 . 70 .65 .35 .95 ·---.. (1) Obtain soil group from maps on file with the Depart~ent of Sanitation and Flood Control. · (2) Where actual conditions deviate significantly from the tabulated imperviousness values of 80% or 90%, the values given for coefficient C, may be revised by multiplying 80% or 90% by the ratio of actual imperviousness to the tabulated imperviousness. However, in no case shall the final coefficient be less than 0.50. For example: ConsiJer ccmmercial property on D soil group. Actual' imperviousness = 50% Tabulated imper.viousness = 80% Revised C = ~ X 0.85 = 0.53 · 8u APPENDIX IX I I I I I I I I· I I I I I I I I I I I URBl9A/ #RE/9.S tJVERL.RNL:) TIME tJF FLtJW Ct./RVES /t:/J(J . : • I "-ii"~•-== ,, ., r ·-~' ri--'-· ' .. -'-r-t·--. -'_J •• J,'1 E-camp/4: 6'/v~n : L eA91'h ol' fifJw • JtJ() /t S/o,c~ " /. tl % _.t-., ... . Co~/'l'/)::oienl' o/ Runo/','_ C •. 5tJ R~ad: tJver/q1u:/ /"lawl>mtt-,/.7 NlnvJ'es ' I ; -o • C: •--·t.: • '. • -~ .:.::: . Dt)-,-r ra.;71 • I ,.-~ • 95: · . . '" .C.. ~ • . • • I • • • • • I• •• . ' I • I .. .... -· ~ . --L-: SAN DIEGO COUNTY I URBAN AREAS OVERLAND TIME DEPARTMENT·OF SPECIAL DISTRICT SERVICES I OF FLOW CURVES DESIGN M.ANU-AL . 1r-----:----,,------ APPROVED :', ,' ·c····· ,1: ,.,... ' .. a e~---DATE lt./t/Gy APPENDIX X-C: --------------· -----INTENSITY'"DURATION D~SIGN CHART ... :, 2 > ;j ;j 11 ,, :i -t < -1--t-t-1-H-t+t-i-t 1-1-i-t--t,-t--t-r llltllllllt-++-H+H+t-ttt-t-1 ,., ... ,. --: ,J ~ I I -t I I I I I I Ip 11111 II 'llllflUllp 111 IIWllll~lll\11!111!11111 I J I . I I I I I I 1111.lllllfll""I > 10 15 20 30 40 50 1 2 3 4 5 6 t.A.!-. •• .L--U-••u.~ Directions for Application: 1) From precipitation 111aps detennine 6 hr. and 24 hr. amounts for the selected frequency. These maps are printed 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 ~pplicable to Desert) 3} Pl-0t 6 hr. precipitation on the right side Qf the chart • 4} Draw a line through the. point parallel to the · plotted 1 ines. 5) This line is the intensity-duration curve for the location being analyzed. Application Form: ·o) Selecteg Frequency __ _.,yr. * 1) P6 = __ in., P24= __ , P6 ;: %* P24 2) Adjusted *P6=. _______ in. 3) tc = ______ min. 4) I = ____ in/hr. *Not Applicable to Desert Region Do,,-:..--.. l , /or-·---,.., ..... "T" ..... ,,."Ir" " ' I .. I I I.. .. ... 0 n > ;:, ;:, I1 ~ :::, -i -< -< -i I1 --------------------·-· COUtITY OF SAN DIEGO DEPARTMENT OF SANITATION & FLOOD CONTROL · 100-YEAR 6-HOUfi. PRECIPIT ATUJ~-j ,-20./ ISOPLUVIALS OF 100-VEAR 6-HOUR PRECIPiTf.t TIOtl l~-1 45 I-I \ l~fl H'{<"'J(; l ,,-.';"i 30 1 11 30\t_\ ~I I ) 5 I '+--,-----t------~v ), ,L J:: 33° 45 I · f I ~ . 'A'-"i° -¼-------t--------r----,-.. -"fi'Jf < .lit I iii I.I I 71 J ·- Prepnf,d by U.S. DEPARTMENU' OF COMMERCE NATIONAL OCEANIC ANO ATl>lOSPIIERIC ADMINISTRATION SPECIAL STUDIES BRANCH, OFFICE OF l!f DROLOGV, NAT!ONAL WEATHER SERVICE 30' -I •/.t JJ8• 45 1 30 1 15' JJ70 45 1 30 1 On.,,.;,c-.o.,-1 1 /fl.C:.. )5 I It 6" 1\001::l\TOTV VT_J'.l ;;o (I) < t-'• 'lfl Cl) p. 'I-' -..... 00 UI ~ >Cl ~ 0 t-1 X X H I lTl -------·------------·--' COUNTY OF SAN D lEGO DEPARTMENT OF-SANITATION & FLOOD CONTROL 100-YEAR 6-HOUR .. PRECIPIT ATHJ~-i r-20_..,, ISOPLUVIALS IOF 100-VEAR 6-HOUR 45 1 I . I ~ )51 •+------i----,---!::jY )\ ,< 7 ! 33° 45 1 __ J ,{.m, 11111.11 I ~ Prcpnf,d by U.S. DEPARTMENU--OF COMMERCE NATIONAL OCEANIC AND AT~OSPIIERIC ADMINISTRATION SPECIAL STUDIES BRANCH, OFFICE OF ut DROLOGY, NATIONAL WEATHER SERVICE --30'-, •I, JJ8' 45' 30 1 15' 1 J 7° LtS I 30 1 RP\T; ~Prl 1 /RC:. ) 5 I 116° APPf:NfHY YT-F 0 D ~ ~-n I) :i. _. ---::,0 J1 l> -0 -0 :Tl z :::, -j >< ><: -j I :r: ·-------·----· ---.. -... -· -COUNTY OF SAN DIEGO DEPARTMENT OF SANITATION & FLOOD CONTROL 100-VEAfl 24-HOttR Pm.:C!PITATI0[1 ,...20../ ISOPLU\IIALS O.f-100 -VEAR 24-HOUR 45 1 30 1 15 I _33° -i-------1-------1----,---'r\~-.....____-;:::--t ·-·- 45 1 l',cpo+•d by U.S. DEPARTMENtr OF COMMERCE NJ\TlONAL OCEA:-;1c ANO AT:,\OSPIIERIC AOMINIS'rRATION SPECIAL STUDIES Bl~ANCII, Ol'l'ICE 01' ll'{ Ol~OLOGY, NATION,\L WEATHER SERVICE 30• I Ill" /15 I 30 1 Jl.j I 117° lj!j I ]01 I:, 1 11611 J!,:,"; ~Prl 1 /8S APPENDIX XI-Il I I I I I I SECTION3 I I I I I I I I I I i I I 1· 'I I I I ·1 I i;I ~i ~ : .' {\::.' --~. ···.'·.··' '(-~, I I I I I :I j J. 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LOCAlEO 156 FEET NORTH OF THE INTERSECTION OF CANNON ROAD ANO RAILROAO CROSSING, 6 FEET HEST OF THE EASTERL Y RIGHT-OF-WAY. ELEVATION IS 43.143' BASED ON NCVO 29. 'l \\ ,, ,, l i I ,I '''[' i ' i ~ ~ CD )> 0 CD ~ 0 ,..._ 0 r 0 I ~ SHEET I OF I SHEETS 01 51 20' ----10 40' SCALE: 1 • = 20' DRAINAGE STUDY EXISTING CONDITIONS DATE OF PREPERATION: NOVEMBER 19. 2002 ' C~/~T DESIGNED BY: G.O. DATE: NOV. 2002 DRAWN BY: J.S. SCALE: AS SHOWN PROJECT MGR.· G.O. JOB NO.: 02-1047 s 2710 Loker Ave West Civil Engineering ENGINEER OF WORK Suite 100 Planning Carlsbad, California 92008 Processing 760-931-7700 Surveying Fox: 760-931-8680 DATE: Oday@Odayconsultants.com GEORGE O'DAY RCE: 32014 \ \ \ \ \ \ \ \ . \ \ \ \ \ ·----------'\ \ o· \ \ • \ \ 1 o· 5 SCALE: 1 ' = 10' ' \ \ • \ ' \ \ \ ' \ \ \ \ \ \ \\ U' \ \ \ I \ \ \ . \ \ _..> \ \ o\ \ \ \ \ ' \. \ \ \ \ \ \ • • \ (;'.·r~=·-~----~--- 1 ,' ; \ \ \ '" \ \ \ 20' \ \ \ \ \ ©2002 O'Day Consultants, Inc. } j / FF= 42.75 DEEPENED roor1NG •. ,\· \'\\ .X \ ' . . ' ' ._...., ________ \ ....,:;_ ', \ \ ' 'I ' ' \ \ ; \ \ I·. ' ; ! I \ S I I \ \ \ \ \ \ \ l \ \ \ \ •. l ' I -I _-r---,. •?\:;.\,:/ .. ,., ;<~-i;""' : _,,.. .. :.i.. '-". er= 42,55· ·,.-' ., ." :"-, TO BE REMOVED : -\-<s J-- '41.25 / ' FF= 41.75 ..... I ' ' EXIST/NC WALL ,, EXIST. .. .-· ~33 BLDG, J'_i ,c.-TO REMAIN _.,- "---.' . . '?~oFESS/~ ff ~O'GE Oo_,J.''( i "' -to NO. 32014 ~ \,l EXP. 12/31/04 ftl * * J'qJt CIVIL fi.*'1;- 0F CA\.l~CJ ' ' / .-· / / EXIST. BLDG, TO REMAIN r-.. ················,······· .,[ /ff' ¢0 ! i I _.:;;--:-~ .. '-·, ,P_:, , -· , ·::--~ -.......-.,.,:,, • ' . \~ 6'4' S',.> ,s: ·& \ '-':& BENCHMARK: THE BENCHMARK FOR THIS SURVEY IS TH£ COUNTY OF SAN DIEGO MONIIMENT OC 0151, WHICH IS A BRASS DISK STAMPED 'OC 151 1968' SET IN CONCR£1E LOCATED 156 FEET NORTH OF TH£ INTERSECTION OF CANNON ROAD AND RAILROAD CROSSING, 6 FEET MST OF TH£ EASTERLY RIGHT-OF-WAY. £LEVA T!ON IS 43.143' BASEO ON NCV!) 29. \ < ' 0\ / ",yJ.."\,} .. d-. t/ /'"'0-.. ·,. / 50' < • "'.) ) '< \ ' \ ' • • \ . \ • • ' \ \ ' \ ' \,--DA )VG!fT LINE I le I i i i \ \ \ \ \ \ \ \ OFs, 1 fHEETS -\-<1 J : . ' ' )> VJ '< I / SJ r <1 I TC/DY PROPOSED DAT£ OF REVISION: AUGUST 18, 2003 OAT£ OF PREPERATION: NOVEMBER 19. 2002 2710 Loker Ave West Suite 100 Corisbad, California 92008 760-931-7700 Fax: 760-931-8680 Oday@Odoyconsultants.com Civil Engineering Planning Processing Surveying DESIGNED BY: ..,,G,,.. ,,_, __ DATE: NOV. 2002 DRAWN BY: ~J=.S.'-+---SCALE: ~ SHOWN PROJECT MGR.· .0. JOB NO.: 02-1047 ENGINEER OF WORK DATE: GEORGE O'DAY RCE: 32014 G1\JOBS\2002\021047\0247DS02.Dw'G 07/18/2003 04130158 PM PDT