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COCOCODRAINAGE CALCULATIONS1" = 20'C3.105/13/202524-1420PROJECT:DATE:SHEET NO.ACI JOB #DRAWN BY:DESIGNED BY:PM REVIEW:SEAL:SIGNATURE:SCALE:SHEET TITLE:QA/QC REVIEW:DATE:O:\PROJECTS\2024\24-1420 MARION COURT DEVELOPMENT\CAD\_CIVIL\PLANS\C3.0-C4.0 DRAINAGE-UTILITIES 24-1420.DWG C3.1 NATASHA IUSTON 5.16.2025 9:52 AM <br />ABONMARCHE <br />COPYRIGHT 2025- ABONMARCHE CONSULTANTS, INC.Engineering · Architecture· Land Surveying <br />Benton Harbor Valparaiso <br />South Bend Hobart <br />Goshen Kalamazoo <br />Fort Wayne Grand Haven <br />Lafayette Grand Rapids <br />315 W. Jefferson Boulevard <br />South Bend, IN 46601 <br />T 574.232.8700 <br />F 574.251.4440 <br />abonmarche.comNO.REVISION DESCRIPTION:BY:DATE:MARION COURT <br />RESIDENTIAL DEVELOPMENT <br /> WEST MARION STREET <br />SOUTH BEND, INDIANANIDSKSDRDSKAIDINNATSTATE OFNo. PE19900163R <br />E <br />GI <br />SEREDPINKYD <br />S.RALONLASSEFORPIINEG <br />EER <br />NNOT FOR PRICINGNOT FOR CONSTRUCTIONFOR REVIEW ONLYLELAND AVENUEWEST MARION STREETWEST MAR <br />ION <br /> STREET1st Fl. & Porch F.F. EL. 707.321st Fl. & PorchF.F. EL. 706.291st Fl. & Porch F.F. EL. 706.441st Fl. & PorchF.F. EL. 706.711st Fl. & PorchF.F. EL. 706.861st Fl. & PorchF.F. EL. 707.131st Fl. & PorchF.F. EL. 707.281st Fl. & PorchF.F. EL. 706.15CL Swale(Typ)The delineated drainage area outlines the overland flow to the parking lot.Roof areas of Units 3-10 will be connected to headers that drain to the on-siteunderground storage system.Overland Drainage Area = 11,152 SFUnits 3-10 Roof Area = 8,277 SF TOTAL = 19,429 SFGrass AreaA=5,178 SFc=0.20Gravel AlleyA= 530 SFc=0.60Pavement/Sidewalk Area: A=5,444 SFc=0.90Roof Area:A=8,277 SFc=0.96 A=19,429 SFc=0.73 = 0.45 AcreThe geotechnical report for the project site recommends a design infiltration rate of 8 inches/hour.In accordance with City of South Bend standards, the underground storage system hasthe capacity for runoff from a 100-year rainfall event. The flood route will follow the areacontours and flow south into West Marion Street to the roadway low point at Exist. StormStr No. 1.DRAINAGE ANALYSISSTORAGE REQUIRED: 2,442 CFTSTORAGE PROVIDED = 1,644 CFT + 826 CFT = 2,470 CFTSTORAGE SUMMARYOVERLAND FLOW DRAINAGE AREAEX. STORM STR. NO. 1Exist. Storm MHRim:703.60UNIT 5UNIT 6UNIT 3UNIT 4UNIT 1UNIT 2UNIT 11UNITS 7-1002040( IN FEET )GRAPHIC SCALE20101 inch = 20 ft.Ex. 14'Alley(grvl.)LOT 3LOT 4LOT 5LOT 6(brick)(asph.)(brick)(asph.)(asph <br />. <br />)10' ELECTRICEASEMENT}See Calculations Above