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Hydrologic and Hydraulic Study for Interconnect of HCFC Unit B 112-02-00 to Unit <br />B109-00-00 and HCFC Regional Detention Site Unit B512-01-00 <br />Prepared For: Harris County Flood Control District <br />Prepared By: Wilbus Smith Associates, Consulting Engineers and Planners <br />April 1997 <br />Seal Engineer: Melvin G. Spinks, P.E. <br />This is an analysis on Armand Bayou and its streams. A regional detention site addresses <br />the mitigation needs to offset and increase in flows due to the interconnection, the <br />proposed East Boulevard Roadway, and flood protection for the downstream residents in <br />the Brookglen Subdivision and the Spencer Highway estate subdivision. The sub - <br />watersheds are B 11202A, B 109A, and B 112B. The recommended ultimate plan <br />addressed (1) the detention storage for HCFC Regional Detention Site Unit B512-01-00 <br />to serve full development in sub -watershed B 11202A, (2) the full diversion of flows <br />along Tributary 1.78 — Willow Springs Bayou (Unit B 112-02-00) to Spring Gully (Unit <br />B 109-00-00) at the interconnect and (3) the channel improvements required along Unit <br />B 109-00-00 and Unit B 112-02-00 to serve the outflow from the proposed regional <br />detention facility. The channel improvements are concrete lined channel and widening. <br />A HEC 1 and HEC 2 analysis was done for this project. The detention pond will have <br />maximum available detention storage of 320 acre-feet at an elevation of 24.6 feet (1973 <br />NGVD adjustment). Base pond elevation is 15.5 (1973 NGVD adjustment). <br />Missing Information: Technical Appendices — Volumes 1 and 2 <br />Site visit shows that the interconnection was constructed and but has been closed <br />