Fluvanna and Buckingham Counties, Virginia
Burgess & Niple provided professional services for the development of an intake designed to withdraw surface-water supply for two combined cycle, natural-gas-fired power plants and other public users. The project includes a river intake, 85,000 feet of 24-inch-and-larger pipeline, a pump station and upground reservoir.
Assignments for the project included boundary surveys for approximately 1,000 acres, soil boring layout, geotechnical studies (including underwater borings), wastewater permitting, Phase I and Phase II ESAs, state/Corps of Engineers permit applications, preliminary design of several upground storage alternatives, and a preliminary engineering report. Work on an operating plan included climatic data acquisition and processing to estimate available stream flows in advance, allowing the operator to plan water withdrawals based on environmental restrictions and expected flow volumes on a 6-hour basis.
The permitting requirements for water withdrawal involved extensive hydraulic and hydrologic studies to determine design conditions and environmental effects. Environmental regulations restricted withdrawal to periods of relatively high flows, and the allowable withdrawal rates varied based on stream flow and season. Coordination with allocations and related studies completed earlier by existing water users was important. The work included extensive analysis and modeling of natural and modified stream flow regimes, with critical review by state and federal agencies.
The ultimate intake solution was a well screen system to be installed as an infiltration gallery in the streambed gravel.
Other work included assistance to the owner in acquisition of property and pipeline right-of-way, and related surveys and geotechnical studies, including the following services:
Burgess and Niple is currently carrying out detailed design of the water supply facilities under a separate design-build contract.