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Person

Nicole C Gammill

Hydrologist
Oklahoma-Texas Water Science Center

Email: ngammill@usgs.gov
Office Phone: 405-698-4422
Fax: 405-843-7712

Location
Broadway Executive Park - Building 7
202 NW 66th Street
Oklahoma City , OK 73116-8224
US

Supervisor: Shana L Mashburn
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The U.S. Geological Survey (USGS), in cooperation with the Oklahoma Water Resources Board (OWRB), constructed a finite-difference numerical groundwater-flow model of the Washita River aquifer by using MODFLOW-2005 (Harbaugh, 2005) with the Newton formulation solver (MODFLOW-NWT). The 1973 Oklahoma Groundwater Law requires that the OWRB conduct hydrologic investigations of the State’s aquifers to determine the maximum annual yield (MAY) for each groundwater basin. The MAY is defined as the total amount of fresh groundwater that can be annually withdrawn while allowing a minimum 20-year life of that groundwater basin. For alluvium and terrace groundwater basins, the life requirement is satisfied if, after 20 years...
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