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Runoff Overview. Tom Hopson. Basic runoff processes. Role in Flood Prediction Process. General Soil Water Processes. General Runoff Terms. Surface Runoff. Infiltration Excess Overland Flow. Saturation Excess Overland Flow. Interflow. Transmissivity Feedback. Soil-Bedrock Interface. - PowerPoint PPT Presentation
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Complex Hydrologic Models
For forecast applications,adding complexity not always warranted:
-limited observations to constrain parameters
-run the risk of over-calibration
Distributed Modeling
-Don’t precisely capture watershed due to discretization-better capture forcing spatial variability and response
Distributed modeling methods allow modeling of smaller and smaller basins. They also allow computation of more realistic runoff within a basin. Flash flood forecasts, for example, have improved with the implementation of distributed models.
Distributed models do however require more complex and more high-resolution data, introducing more uncertainty.