Constructing a hydrologic model of the Ichawaynochaway Creek watershed
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The Ichawaynochaway Creek is a major tributary to the Flint River, which flows through one of the most important and productive agricultural lands in southwest Georgia. Understanding the basin’s hydrologic response to natural perturbations such as precipitation, and artificial impacts of surface and groundwater withdrawal is important to the environmental and economic well being of the basin. An HSPF hydrologic model has been formulated to simulate the system’s behavior upon such perturbations. The model has been calibrated against two independently observed in-stream flow data sets at two different locations. The “goodness of fit” is reasonably good, with the Correlation Coefficient, the Coefficient of Determination, and the Nash-Sutcliffe Model Efficiency Coefficient all being satisfactory. Upon satisfactory calibration, the model can be used to generate unimpaired incremental in-stream flow, which will be fed into a surface water hydrologic model accessing artificial effects on both water quantity and water quality.