Author(s)

H. Ahmad & J. W. Miller

Abstract

In a closed basin, where runoff is not allowed to discharge outside the watershed, a systematic design of storm water routing with retention facility is necessary to manage the runoff. This article presents a successful design to route the excess runoff generated due to the change in land-cover from an 11.4 acre site in Tallahassee, Florida, USA. The site development involved conversion of a wooded area to an aquatics complex with pools, buildings, parking lots, and driveway access etc. creating 2.4 acre impervious area. A pond with adequate storage capacity was not feasible to construct within the site due to site constraints and high-cost. The runoff generated from the new impervious area was designed to route through the newly designed small onsite dry-detention pond and discharged to an existing offsite pond, located within a closed basin. The analysis showed successful design of an onsite pond that retains as much water as possible within the site and safely releasing excess volume downstream to the offsite pond. The results confirmed that the offsite pond in the closed basin can retain all runoff without any discharge and the two ponds in series can handle any extreme storm in an integrated manner. Keywords: site development, runoff, routing, pond, closed basin, ICPR. 1 Introduction The process of urbanization increases impervious area, which in turn results in increased runoff. In addition, the changes in slope of land surface, reduced

Keywords

site development, runoff, routing, pond, closed basin, ICPR