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Home My WebLink AboutCT 83-04; Windsong Shores; Drainage Study; 1989-08-241 i ! WINDSONG SHORES (C.T. 83-4) c?.Y s3h3-0q DRAINAGE STUDY i August, 1989 J.N. 300-2 Revised: August 24, 1989 ENGINEERING DEPI LIBRARY city of Carlsbad 2075 Las Palmas Drive CarlsbaQ CA 92009-4859 D520. B .28 Crosby Mead Benton & Associates Planners - Engineers - Surveyors WINDSONG SHORES (C.T. 83-4) DRAINAGE STUDY August, 1989 J.N. 300-2 Revised: August 24, 1989 CNGINEERING DEPT. LIBRARY City of Carlsbad 2075 Las Palmas Drive Carlsbad, CA 92009-4859 PREPARED FOR: CROSBY MEAD BENTON & ASSOCIATES SUITE 170 5966 LAPLACE COURT CARLSBAD, CALIFORNIA 92008 (619) 438-1210 BY: Kim L. Post R.C.E. 23166 Exp. 12/31/89 INTRODUCTION METHODOLOGY CALCULATIONS - Sit2 Hydrology - Offsite Hydrology - Syscem Hydraulics SITE TRIBUTARY AREA MAPS SITE FINISH GRADIIJG NAPS (REFERENCE OFFSITE T3.IBUTARY AREA IdAP LOCATION MAP APPENDIX 11 5 20 21 30 33 34 Job Ifo. 300-2 August 1989 Page 1 of 34 WINDSONG SHORES (CT 83-41 DRAINAGE STUDY This report analyzes the runoff and the proposed drainage system to be constructed with the development of Lots 1 and 2 of Map No. 11484. Jindsong Shores, in Carlsbad, California. Windsong Shores is comprised of approximately five (5) acres adjacent to the north bluff of Agua Hedionda Lagoon lying between Interstate 5 and the AT&SF Railroad. The site will be developed with 130 condominium units built over an underground garage. The land presently slopes to the south and down the bluff to the lagoon: when developed, the area north of the bluff face will be drained by a system of pipes which will connect to an existing drainage system located on the property immediately to the north. Enclosed location and rough grading plans show this site and its proposed drainage system, plus the area northerly that is tributary to the same outfall drainage pipe. The intent of this report is to provide runoff and pipe flow calculations to support the proposed private storm drain facilities which include pipes, inlets and cleanouts. Windsong Shores Drainacre Study Job No. 300-2 August 1989 Page 2 of 34 Drainage maps (reduced site grading plans and offsite topographic maps) are included with this study: these maps also show the existing and proposed storm drains on and adjacent to this development. Windsong Shores Erainage Study Job NO. 300-2 August 1989 Page 3 of 34 METHODOLOGY This study utilizes the design criteria outlined in the San Diego County Flood Control District's Desi.gn and ~P~ocedure-.Manugl_ in its calculations and analyses. The 100-year storm runoff discharges are analyzed throughout the storm drainage facilities. Onsite An inlet on the main storm drain line under the qarage has been selected as the representative "collection point" for each tributary area or group of Ireas. Actual inflows into the main line will occur at various points along its length from roof and deck drain laterals to be constructed with the building, as well as fron the area drain laterals shown on the rough plan. The average runoff coefficient (C) for each tributary area is based on che approved site plan and final landscape plans: a. Building & on deck planter areas c = 0.85 (Areas 1, 2, 3, 5, 9 & 12) b. Landscaping and pool areas (Areas 4, 6, 7, 10 & 11) c = 0.55 c. Landscaping & access drive (Area 8) c = 0.1 Windsonq Shores Drainage Study Job NO. 300-2 August 1989 Page 4 of 34 Off site Existing inlets and junctions have been selected as "collection points" for the tributary areas. The average runoff coefficient for each tributary area was established by visiting the site and using the aerial top0 map of the area (see "Offsite Tributary Area Map", Paqe 33). Existing drainage systems were taken from Asbuilt plans on file with the City, supplemented by field survey information in rhe vicinity of the downstream connection point near the western project boundary. The Appendix contains the Intensity-Duration Design Chart and calculations, including the Intensity equation, which was used directly since the chart only goes down to ten (10) 3inutes. it also contains the Pipe Flow Charts used to determine the averaas normal depth and velocity in each reach of pipe and orher reference materials. Windsong Shores Drainage Study Crosby Mead Benton & Associates Sheet 5 of August 1989 Windsong Shores Drainage Study Crosby Mead Benton & Associates Sheet _h of x August 1989 .. ................. -. ... - . ~ .. .... - - ,~ .... ....... " ... . - ... Windsong Shores Drainage Study Crosby Mead Benton & Associates Sheet 1 of August 1989 Windsong Shores Drainage Study Crosby Mead Benton & Associates Sheet of 3y August 1989 Windsong Shores Drainage Study Crosby Mead Benton 6r Associates Sheet 9 of x hugust 1989 Windsong Shores Drainage Study Crosby Mead Benton & Associates Sheet of a kugust 1989 Windsong Shores Drainage Study Crosby Mead Benton & Associates Sheet // of 3 hugust 1989 Windsong Shores Drainage Study Crosby Mead Benton & Associates Sheet & of .?& hugust 1989 Windsong Shores Drainage Study Crosby Mead Benton & Associates Sheet 13. of 3 hugust 1989 .. 4. Windsong Shores Drainage Study Crosby Mead Benton & Associates Sheet of a hugust 1989 .. .. .. : il I I Windsong Shores Drainage Study Crosby Mead Benton & Associates Sheet fi of 2 hugust 1989 Windsong Shores Drainage Study Crosby Mead Benton & Associates Sheet & of 3 hugust 1989 Windsong Shores Drainage Study Crosby Mead Benton & Associates Sheet 2 of 3 August 1989 . .. Windsong Shores Drainage Study Crosby Mead Benton & Associates Sheet 18 of 3 August 1989 .. - .. Windsong Shores Drainage Study Crosby Mead Benton & Associates Sheet 19 of 3 August 1989 " .. .. .. .. .. .. Windsong Shores Drainage Study Crosby Mead Benton & Associates Sheet 24 of a August 1989 ... Windsong Shores Drainage Study Crosby Mead Benton & Associates Sheet 2 of a August 1989 .. .. .. .. I .. .. .~ .. .. Windsong Shores Drainage Study Crosby Mead Benton & Associates Sheet 22of 2 August 1989 .. Windsong Shores Drainage Study Crosby Mead Benton & Associates 31.8 u /- Sheet of a August 1989 Windsong Shores Drainage Study Crosby Mead Benton & Associates Sheet 2 of August 1989 Windsong Shores Drainage Study Crosby Mead Benton & Associates Sheet a of August 1989 /I Windsong Shores Drainage Study Au ust 1989 Crosby Mead Benton & Associates Sheet of % c WINDSONG SHORES (C.T. 83-41 DRAINAGE STUDY .. A N 6-Hour Precipitation (inches) ... ?-?yam 0 v) a UI ". - 0 f e x S C .I- C VI Y W 'i= E '0 0 a " d . - m. APPENDIX XI-G - .. . d . 'W 4 % r II-4 *I a hr . a . a- m. 9 a- u) PIP€ FLOW CHART I2 -INCH DIAMETER E- 6 PIPE FLOW CHART 18-INCH DIAMETEff II- 8 PIP€ FLOW CHART 24-INCH DIAMETER II- 18 a % a a ; a a rn a a v) a 0 V a 9 a a R1 a 2 c 0 a ? Q 0 a V M 0 4 PIPE FLOW CHAffT 72 -INCH DIAMETER