In this paper we systematically evaluate a GIS-enabled and data-intensive modeling system to assess the system's capability to simulate the regional-scale ground water flow in 26 of 38 USGS 8-digit Hydrologic Unit Codes (HUCs) across Michigan's Lower Peninsula. All models simultaneously simulate the glacial and uppermost bedrock aquifer layer in the peninsula. Specifically, the modeling system is used to simulate the long-term average static water levels and base flow in the glacial aquifer, and long-term average piezometric heads in the bedrock aquifer. The results are compared with the measured ground water levels from Michigan's statewide ground water database (MSGWD) and USGS-estimated base flow values. The coupling between the models and data allows real-time and interactive analysis of the assumptions and boundary conditions used in the conceptual models. Overall, this paper presents the most extensive regional-scale modeling and evaluation effort in Michigan to date that provides critical insight into the state's ground water systems. We postulate that the results of this research will have significant implications on the sustainable management of Michigan's ground water resources and ground water dependent ecosystems.
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