Simulating Lake-groundwater Interaction with MODFLOW
Council, Gregory W.
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Simulating the interaction between groundwater and surface water can help in assessing the impacts of development on water resources. A new computer modeling package (LAK2) was developed for simulating lakegroundwater iteraction with the popular MODFLOW (Modular Three-Dimensional Finite-Difference Ground-Water Flow Model) program, including lake-steam interaction using MODFLOW's steamflow routing (STR2) package. The new package solves for steady-state or transsiieenntt lake stage, or the stage cca nb e specified by the user. The new lake package builds on the capabilities of previously-documented packages (LAK1 by Cheng and Anderson and RES1 by Fenske and others). The utility of the LAK2 package is demonstrated with a real-world example in which modeling is used to predict lake level decline at four lakes in response to groundwater drawdown resulting from the operation of a proposed underground mine.