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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />The total oetention capacity of the existing ponds in Reach 3 is 12 acre feet. When <br />this capacIty is exceeded and the flow rates surpass about 12 to 14 cfs, runoff will overtop <br />Holly Street. This has occurred twice in the last 3 years causing extensive erosion damage <br />to the Holly Street embankment. <br /> <br />A 36 inch concrete pipe conducts flow beneath 112th Avenue from Reach 4. The <br />vacant area at the upstream side of 112th Avenue presently acts as a small detention area <br />ponding water behind the road embankment. Most of the basin upstream from 112th <br />Avenue has been developed and minor storm runoff is handled by underground sewer <br />systems in the subdivisions. Most of the systems, including the 3,400 linear feet of storm <br />sewer from Cherry Drive to the upstream Study Limits and included in the project area, <br />are capable of handling runoff from a two-year event. <br /> <br />Il-2 <br />