Sherwood Lakes Stormwater

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Overview

The Sherwood Lakes subdivision is located along Princess Anne Road, ​approximately ​three-fourths of a mile south of the intersection of Sandbridge Road and Upton Drive.  The neighborhood was developed in 2008 along two lakes that were originally borrow pits that were in operation for 20-30 years.  The stormwater management system in the neighborhood was designed based on these lakes maintaining a normal water surface elevation of 3.0-ft.  Based on recorded gauge readings at the lakes, the actual water surface elevation varies from about 4.5-ft to 6.0-ft depending on the surrounding ground water level, thus causing diminished storage capacity of the lakes.  Consequently, during severe rainfall events, or back-to-back rains, the lakes are overtopping their banks and causing flooding.
In May 2017, an engineering analysis of the hydrology and hydraulics of the two lakes was completed.  Improvements were identified to lower and maintain the elevation of the lakes to 3.0-ft, and to limit the rise in the lakes during storm events.  The FY18 capital improvement program recently adopted by the City Council provides $3.0 Million to help improve the Sherwood Lakes drainage system.​

Current Drainage Improvement Projects

      • Sherwood Lakes Drainage Improvements, CIP 7-048:  This multi-phase project will include the construction of two stormwater pump stations, and a connection between the two lakes.​​ 
      • Sherwood Lakes Pumping Project:  This project will construct a permanent intake pipe from the north lake across Locksley Arch to an existing City owned parcel at 2265 Locksley Arch.  In addition, a permanent force main (approximately 1,500 linear feet) and a discharge/diffuser structure will be constructed near the intersection of Nottoway Lane and Olmstead Lane.

​​Current Update

Public Works Operations has positioned one 8-inch portable pump to maintain the lake levels between elevations 3.0-ft and 4.0-ft until the program of planned improvements has been constructed.  Pumping protocols have been developed to ensure that a procedure is in place to mitigate flooding in the neighborhood.  The water surface elevations are monitored once a month or after a rain event whichever is more frequent.  Public Works Engineering has issued a work order to begin preliminary design on proposed initial improvements currently funded in CIP 7-048.