WMS:Modified Rational Hydrograph

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The Modified Rational Hydrograph also assumes that the time to peak is equal to the , but allows for the duration of the storm to be longer than , resulting in a trapezoidal shaped hydrograph as shown below. A coefficient to modify the slope of the receding limb may also be applied with this method.

File:WMSImage80.gif

where:

  • = time of concentration.
  • = Flow at time , in cfs.
  • = Peak flow.
  • = falling limb coefficient
  • = storm duration


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