Cedar Creek Storm Drainage Design

Schlagel & Associates, P.A. performed an analysis of the 1,900 acre watershed of Cedar Creek through the Cedar Creek Development.  The purpose of the study was to determine a means of creating regional detention facilities to minimize the impact of future development on existing structures lower in the basin.  The basin included 3 existing lakes which were analyzed of which two of them were connected by a culvert, creating a variable tailwater condition over time during the analysis.  We analyzed  fourteen different scenarios consisting of various detention basin locations and combinations of basins to determine the level of storm protection.  We determined key buildings which were at high risk of being flooded and needed to be protected as well as set minimum elevations for future buildings in portions of the watershed.  After discussing with the client the various options, it was decided to use 3 regional detention basins which will be constructed when the basin is developed.  We are currently in the process of preparing final design documents for the first detention basin and obtaining State approval.

The study was modeled using Pondpack software.  Runoff was determined using TR-55 and the detention basins were modeled using the storage indication method.

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