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Runoff Overview

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.

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Runoff Overview

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  1. Runoff Overview Tom Hopson

  2. Basic runoff processes

  3. Role in Flood Prediction Process

  4. General Soil Water Processes

  5. General Runoff Terms

  6. Surface Runoff

  7. Infiltration Excess Overland Flow

  8. Saturation Excess Overland Flow

  9. Interflow

  10. Transmissivity Feedback

  11. Soil-Bedrock Interface

  12. Groundwater Ridging

  13. Pre-Event Water

  14. Contributing Area and Runoff Volume

  15. Basin Size and Runoff Timing

  16. Basin Shape

  17. Stream Meanders

  18. Basin Slope

  19. Soil Properties

  20. In Depth: Soil Formation Processes

  21. Soil Texture Classification

  22. Soil Composition

  23. Soil Profile

  24. Surface Properties

  25. Runoff Modeling Concepts -lumped -semi-distributed -distributes

  26. Complex Hydrologic Models For forecast applications, adding complexity not always warranted: -limited observations to constrain parameters -run the risk of over-calibration

  27. Lumped Modeling Semi-Distributed Modeling

  28. Distributed Modeling -Don’t precisely capture watershed due to discretization -better capture forcing spatial variability and response

  29. 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.

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