Routing Runoff

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Routing Runoff

• Environmental Hydrology

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Effect of development on runoff
Ward Trimble, Fig. 5.13
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Predicting Runoff and Storm Flow

• The Rational Equation (the SIMPLE model)
• Peak runoff discharge
• The Curve Number concept
• Storm runoff depth ? runoff volume
• The Graphical Peak Discharge method
• Peak runoff discharge
• Empirical Regression models
• e.g. USGS National Flood Frequency model
• And many others including physically-based
  models!

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Downstream routing of hydrologic response
Ward Trimble, Fig 8.12
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Muskingum routing
S K(O) Kx(I-O)
where S storage I inputs O outputs K
travel time constant for a reach x weighting
factor for a reach
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Muskingum Routing
For more details see Bedient and Huber, 1992.
Hydrology and Floodplain Analysis.
Addison-Wesley.
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Issues in hydrologic prediction
See Ward Trimble, sec. 5.8

• Data availability / quality
• Accuracy / appropriateness of selected estimation
  techniques (aka models)
• Scaling (its about routing, but a lot more!)

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