EFFECTS OF TERRAIN MODIFICATION ON SURFACE WATER RUNOFF FROM THE BLUEBERRY COTTAGES WATERSHED AT MOUNTAIN LAKE, GILES COUNTY, VIRGINIA
During construction two stormwater retention basins were constructed intentionally, while an unintentional stormwater basin resulted from modifications to the natural topography. Two larger catchment areas feed these basins. The study area was divided into land use coverage zones and assigned appropriate runoff coefficients. After classifying land use areas, annual flow values were estimated for pre and post construction models. Utilizing ArcMap 10.1, the catchment areas’ annual flow values were removed from the post construction annual flow value to account for the water lost within the system as a result of development. Comparison of the pre and post construction values showed a decrease in surface water runoff into the lake. This decrease in flow to the lake can be correlated to a decrease in lake water levels.
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