Hydrologic Modeling of the Apalachicola–Chattahoochee–flint River Basin Using the U.S. Geological Survey Precipitation Runoff Modeling System
LaFontaine, Jacob H.
Hay, Lauren E.
Markstrom, Steven L.
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The U.S. Geological Survey (USGS) Southeast Regional Assessment Project (SERAP) was initiated in 2009 to help environmental resource managers assess the potential effects of climate change on ecosystems. One component of the SERAP program is the development and calibration of a set of multiresolution hydrologic models of the Apalachicola– Chattahoochee–Flint (ACF) River Basin. The ACF River Basin, which is home to numerous fish and wildlife species of conservation concern, is regionally important for water supply and is a focus of complementary environmental and climate-change research. Hydrologic models of varying spatial extents and resolutions are required to address varied localto- regional water-resource management questions as required by the scope and limitations of potential management actions. These models were developed by using the USGS Precipitation Runoff Modeling System (PRMS). The coarse-scale model developed for the ACF River Basin has a contributing area of approximately 50,700 square kilometers. Six fine-resolution PRMS models, ranging in size from 396 to 2,690 square kilometers, are nested within the coarse-scale model and have been developed for the following basins: the upper Chattahoochee, Chestatee, and Chipola Rivers, and Ichawaynochaway, Potato, and Spring Creeks. Both coarse- and fine-scale models simulate basin hydrology using daily timesteps, measured climatic data, and basin characteristics, such as land cover and topography. Measured streamflow data are used to calibrate and evaluate computed basin hydrology. Being able to project future hydrologic conditions for this set of models will rely on the use of land cover projections in conjunction with downscaled Global Climate Model results.