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Publication Abstract

Yield Assessment for Lake Vermilion, Vermilion County. McConkey, Sally A. and H. Vernon Knapp, 2001  Illinois State Water Survey, Champaign, IL,  ISWS CR 2001-04    Full Text Available
The City of Danville's public water supply is operated by the Consumers Illinois Water Company, Vermilion Division (CIWC). Lake Vermilion impounds the North Fork Vermilion River. Water is released to supply the intake pumps located approximately one mile downstream of the lake. A low channel dam creates a pool at the intake structure. Reservoir storage is used in essentially the same manner as if the intake were located in the lake, drawing stored water from the lake when the natural inflow of the North Fork alone is insufficient to supply the city's water needs.

Long-term planning for the city's water needs requires an evaluation of the existing system's sustainable yield. The sustainable net yield from the water supply may be defined as the water withdrawal rate that can be expected to be delivered during droughts of specific frequencies, e.g, 10-, 25-, 50-, and 100-year return periods. Several factors define the sustainable net yield of the CIWC water supply system, including the North Fork streamflow patterns, the storage volume of Lake Vermilion, precipitation on and evaporation from the surface of Lake Vermilion, and the amount of water that bypasses the intake and is not withdrawn.

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