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Development of digital groundwater flow models of the Mississippi River Valley alluvial aquifer in eastern Arkansas was prompted by the growing concern about large water-level declines in the alluvial aquifer and by the need to better understand the flow system. Several flow models have been developed previously, but at scales that are too large for analyzing the effect of future pumping at a farm or local scale. Models developed and described in this report are at a one-square-mile cell scale that can be used to define local conditions. Because of the size of the study area, two models (a north model and a south model) were developed; the Arkansas River divides the study area and functions as a hydrologic boundary to the models. Both models simulate groundwater flow in one layer with recharge entering the aquifer from surface infiltration through the overlying confining unit and from seepage through riverbeds.

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