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- • �„l-" . , L' .'�ii <br />MF�DISON AVEtvUE PRD - REi'�N`iTON COhft�UTAPIO"�S: <br />Design Criteria: <br />1) 10-year storm that produces 1.0 inches in 4]io•srs. <br />2) Sustained Rate of Infiltration = 1.0 in/hr. <br />3) Soil t-ype - Alden000d Gravelly Loam (Ag). <br />4) Natural runoff release rate equals .2 in/hr. <br />5) 0.65 acres impervious when site developed. <br />St saqe Requirements: <br />Prrvious Areas: Total Rainfall <br />Less Release <br />Less Infiltration <br />Impervious Areas: Total Rainfall <br />Less Release <br />= 1.� inches (4 hours) <br />_ .8 (.2 in/hr x 4 nours) <br />= 2.0 (1 in/hr x 2 hosrs) <br />= 0 Remainino Storage Required <br />= 1.0 inches (4 hours) <br />_ _8 inches (.20 x 4 hours) <br />_ .2 inches Storage Required <br />.". Total Volume Required due to impervious area: <br />_ .2 in. = 12 in/ft x 0.65 acres <br />_ .011 acre feet <br />475 cu. ft. <br />On-site Retention Provided: <br />Storage Vol.ume: <br />Underground: 120 f�et �f 24 inch C.b1.P. = 377 cu. �t. <br />Sur.fac�: 15 foot radius around �-ach C.B.,0.2 feet <br />maximum depth = 170 cu. ft. � <br />.'. Total Volume = 547 cu. ft. <br />-2- <br />