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Modeling the Impacts of Land Use Activities on the Subsurface Flow Regime of the Upper Roanoke River Watershed

By  and Victoria Ann Barone and Victoria Ann Barone


The goal of this study was to determine the impact of land use activities on the subsurface flow regime in the Upper Roanoke River Watershed in Virginia to determine the impacts of land use change on the subsurface flow system, and to provide a tool for future management decisions. Land use activities can impact the groundwater system in two ways. The volume of water recharging the groundwater system can be reduced due to an increase in low permeable areas. It is assumed in this investigation that the input recharge values reflect the increase of low permeability zones that may occur due to land use activities. Increased water withdrawal associated with an increase in population can be another impact of land use change. This possible increase in water withdrawal is explicitly simulated in this investigation. MODFLOW, the USGS, three-dimensional, finite-difference, groundwater flow model was used to develop a regional conceptualization of the flow system. The fractured bedrock aquifer system consists of three sloping geohydrologic units: the Ordovician to Mississippian clastics, the Cambrian and Ordovician carbonates, and the Precambrian and Cambrian metamorphics and clastics. The 575 mi 2 study area was divided into cells with dimensions of 0.25 miles by 0.25 miles and containing four layers. The upper model layer was used to simulat

Topics: Groundwater Modeling, Simulation, MODFLOW, Fractured Bedrock, Upper
Year: 2000
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