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Q <br />N <br />rn <br />N <br />O <br />N <br />Lri <br />z <br />OO <br />u') <br />a <br />2 <br />a <br />a <br />z <br />M <br />U <br />0 <br />6 <br />N <br />LU <br />N <br />v7 <br />F- <br />J <br />H <br />7 <br />LU <br />C7 <br />Q <br />z <br />ry <br />0 <br />0 <br />U <br />ME <br />J_ <br />V <br />1 <br />SMH <br />OVERLAND FLOW DRAINAGE AREA <br />W <br />® <br />CB <br />---__--= S--------- <br />----------------------- <br />11 I r <br />J <br />- - -Ii- - - - (aspn.) \/ <br />------------ EX. STORM STR.NO. 1� <br />- - Exist. Storm MH <br />Rim:703.60 <br />A <br />0 �jl <br />LP1 1 <br />/ <br />Lu <br />D <br />I I I I I Lu lid r <br />Q_- <br />I <br />I -� I I 1 J II I <br />I�- - I f��p I Lu II I I I II I I <br />II I I I <br />..�• � I I i it I I <br />I I I II I I <br />I I II I I <br />UNIT I I I I <br />1st FI. & Porc I I II <br />F.F. EL. 707.28 I I i it <br />IF - <br />I I I II I <br />I I I II I I <br />UNIT 4 <br />\ 1st FI. & Porch I J I I I <br />F.F. EL. 706.86 <br />I I II I I <br />(brick) <br />11 PP'� 0 <br />1st FI & Porch I I II SMH I� I <br />F.F. EL. 706.15 <br />1st F�I I <br />UN&, , , Porh I I II (asph.) I� <br />. ch <br />F.F. EL. 70 .44 I �i II II <br />I I II W- <br />I I <br />I I I +J�i <br />I, • • ® ,, ,, • L <br />J1 <br />•' <br />PP P%P/L • 000 W// <br />Q�LP// l <br />i <br />\\ W <br />SMH <br />GRAPHIC SCALE <br />20 0 10 20 40 <br />( IN FEET ) <br />1 inch = 20 ft. <br />DRAINAGE ANALYSIS <br />In accordance with City of South Bend standards, the underground storage system has <br />the capacity for runoff from a 100-year rainfall event. The flood route will follow the area <br />contours and flow south into West Marion Street to the roadway low point at Exist. Storm <br />Str No. 1. <br />The delineated drainage area outlines the overland flow to the parking lot. <br />Roof areas of Units 3-10 will be connected to headers that drain to the on -site <br />underground storage system. <br />Overland Drainage Area = 11,152 SF <br />Units 3-10 Roof Area = 8,277 SF <br />TOTAL = 19,429 SF <br />Grass Area <br />A=5,178 SF <br />c=0.20 <br />Gravel Alley <br />A= 530 SF <br />c=0.60 <br />Pavement/Sidewalk Area: <br />A=5,444 SF <br />c=0.90 <br />Roof Area: <br />A=8,277 SF <br />c=0.96 <br />A=19,429 SF <br />c=0.73 <br />= 0.45 Acre <br />The geotechnical report for the project site recommends a design infiltration rate of 8 inches/hour. <br />Design Return Period <br />Watershed Area <br />Developed Runoff Coefficient <br />Release Rate: <br />Perforated Pipe <br />Diameter <br />Permeability <br />Exfiltration Rate <br />Exfiltration Area per Ift <br />Length of Perforated Pipe <br />Exfiltration Area, Total <br />Ex. Discharge Rate <br />1'45 years �.��� acres } See Calculations Above <br />0.717 <br />24 in <br />Drywell <br />,OI) in/hr <br />Size <br />1700 gal <br />0.00019 feetlsec <br />Permeability <br />21'00 in/hr <br />18.0 sfUlft <br />Exfiltration Rate <br />0.00019 feet/sec <br />710 Ift <br />Exfiltration Area per Drywell <br />267 sftlea <br />1,314 sft <br />Number of Drywells <br />3,0 ea <br />0.243 cfs <br />Exfiltration Area, Total <br />801 sft <br />Ex. Discharge Rate <br />0.148 cfs <br />Total Release Rate <br />0.39 cfs <br />Storm Duration <br />hrs <br />25-Year Intensity <br />in/hr <br />Intlow <br />Rate <br />cfs <br />Kelease <br />Rate <br />cfs <br />Storage Rate <br />cfs <br />Required Storage <br />acre-feet <br />Storage w/ Silt. <br />Factor 1.06 <br />Kequired <br />Storage <br />cft <br />0,08 <br />10,00 <br />129 <br />0,39 <br />2.89 <br />0,02 <br />0.02 <br />891 <br />0.17 <br />7.52 <br />2.47 <br />0.39 <br />2.08 <br />0.03 <br />0.03 <br />1360 <br />0.25 <br />6.23 <br />2.05 <br />0.39 <br />1 1.65 <br />0.03 <br />0.04 <br />1592 <br />0.33 <br />5.68 <br />1.87 <br />0.39 <br />1.47 <br />0.04 <br />0.04 <br />1872 <br />0.5 <br />4.50 <br />1.48 <br />0.39 <br />1.09 <br />0.05 <br />0.05 <br />2,090 <br />0.67 <br />3.99 <br />1.31 <br />0.39 <br />0.92 <br />0.05 <br />0.05 <br />2,369 <br />0.83 <br />3.52 <br />1.16 <br />0.39 <br />0.76 <br />0.05 <br />0.06 <br />2,442 <br />1 <br />3.01 <br />0.99 <br />0.39 <br />0.60 <br />0.05 <br />0.05 <br />2,298 <br />1.5 <br />2.47 <br />0.81 <br />0.39 <br />0.42 <br />0.05 <br />0.06 <br />2,422 <br />2 <br />1.93 <br />0.63 <br />0.39 <br />0.24 <br />0.04 <br />0.04 <br />1865 <br />3 <br />1.40 <br />0.46 <br />0.39 <br />0.07 <br />0.02 <br />0.02 <br />787 <br />6 <br />1 0.84 <br />0.28 <br />0.39 <br />9 <br />0.66 <br />0.22 <br />0.39 <br />12 <br />0.48 <br />0.16 <br />0.39 <br />24 <br />0.27 <br />0.09 <br />0.39 <br />Required Storage 0.06 <br />2,442 cft <br />Available Storage <br />Perforated Pipe <br />3.14 cft/lft <br />Drywell <br />169.65 cft/ea <br />Agg void rate <br />1�55,n <br />Agg void rate <br />23_9% <br />Agg around pipe <br />19.38 cft/lft <br />Agg around drywell <br />105.56 cft/ea <br />Length of Pipe <br />73 Ift <br />Number of Drywells <br />3.00 ea <br />Total <br />1,644 cft <br />Total <br />826 cft <br />STORAGE SUMMARY <br />STORAGE REQUIRED: 2,442 CFT <br />STORAGE PROVIDED = 1,644 CFT + 826 CFT = 2,470 CFT <br />NOT FOR PRICING <br />NOT FOR CONSTRUCTION <br />FOR REVIEW ONLY <br />NO. I REVISION DESCRIPTION: <br />BY: I DATE: <br />W0 <br />00p <br />_ri:' <br />QoE�� <br />V <br />> = Y <br />O <br />Q <br />O C <br />C <br />m 0 <br />C 7 N O <br />0 <br />cc O O <br />0 <br />Ica <br />0 <br />' <br />Q <br />7 <br />0 <br />m� E <br />C C U <br />oZ 2 <br />(�r�= <br />q U <br />C 4 <br />m N a <br />a= N <br />1. <br />N 7 r` � O <br />- <br />M N � O <br />H <br />Z <br />W <br />�OWa <br />LU <br />OZ <br />W <br />V>zo <br />LJJ <br />Z z <br />ZaF <br />Z <br />OJT= <br />LLI <br />Q <br />A/ <br />W =D <br />30 <br />Z <br />W <br />,Ifl <br />v I <br />W <br />9X <br />Lu <br />NI <br />DESIGNED BY: <br />DSK <br />PM REVIEW: <br />SDR <br />QA/QC REVIEW: <br />DSK <br />DATE: <br />05/13/2025 <br />SEAL: <br />.GR \STE�. <br />:No. PE 19900163i _ <br />•: STATE OF 1 <br />O C),�� •. ND I AN..� � Q <br />0NAL <br />7"111;1` ��� �O`• <br />/11111111, <br />SIGNATURE: <br />DATE: V <br />05/13/2025 <br />SCALE: <br />1" = 20' <br />ACI JOB # <br />24-1420 <br />SHEET NO. <br />C3,1 <br />Z <br />0 <br />Z <br />s <br />a <br />a <br />a <br />U <br />u <br />�� <br />