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 Projectssherwood overview.jpg

      • ​​Sherwood Lakes Interconnect, CIP 7-048.001:  This project involves an interconnection pipe and sensors to allow South Sherwood Lake to flow into North Sherwood Lake. ​​​

      • North Sherwood Lake Pumping Improvements, CIP 7-048.002:  This project will construct a permanent pump station, permanent intake pipe. The pipe leads from the north lake across Locksley Arch to the pump station, then to a permanent force main (approximately 1,500 linear feet) and a discharge/diffuser structure constructed near the intersection of Nottoway Lane and Olmstead Lane.​

​​Current Update

Pumping protocols have been developed to ensure that a procedure is in place to mitigate flooding in the neighborhood maintaining the lake levels between elevations 3.0-ft and 4.0-ft.  The water surface elevations are monitored once a month or after a rain event whichever is more frequent.  

With funding by CIP 7-048, Public Works Engineering has contracted two projects in the Sherwood Lakes area.

  • The first is an interconnection pipe to allow South Sherwood Lake to flow into North Sherwood Lake. This project is complete. Next, sensors will be installed to monitor water levels.
  • The second project is a pump station at North Sherwood Lake. This pump station will monitor and lower both lakes prior to storms. The lowered lake will provide storm water storage during a storm. There will be no pumping during storms. This will allow the downstream ditches to drain other land. Pumping will restart when downstream gauges show that the stream levels are low enough to accommodate any excess in Sherwood Lakes. North Sherwood Lake Pumping Station" is underway. It should be operational before the end of 2019.​