Assessing Water Balance Using a Hydrologic Model

Author(s): Duffy, S.; Parajuli, P.

The availability of water within soil is fundamental to the success of agricultural, ranching, and forestry practices. The amount of water than is present within the soil column depends on climate, land use, land management practices, and soil characteristics. The objective of this study is to assess water balance parameters such as surface flow, soil moisture content, and water quality parameters using field studies and the Soil and Water Assessment Tool (SWAT) model simulations.

Two watersheds located in northeast (Town Creek, 1775.2 km2) and central (Upper Pearl River, 7,588 km2) Mississippi were chosen as the focus of this study. Soil samples from four fields of varying land use were collected monthly and analyzed to determine actual soil water content. Theoretical soil water content was predicted by developing two independent computational models using SWAT. The models were calibrated and validated using monthly stream flow data obtained from USGS gauging stations. Field-observed soil water content and model-predicted soil water content was analyzed statistically. Further model-simulated uncalibrated water balance and water quality outputs will be presented.

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Technical Sessions

1 Best Management Practices #1
2 Delta Water Assessment
3 Flood Assessment & Mgmt.
4 Wetlands
5 Watershed Mgmt. #1
6 Non-Point Source Assessment
7 Modeling
8 Water Quality
9 Best Mgt. Practices #2
10 Delta Water Conservation
11 Sedimentation
12 Storm Water
13 Watershed Mgt. #2
14 Public Water Systems
15 Surface Water Assessment & Evaluation

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