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:ModifiedRationalHydrograph.gif
where:
- = time of concentration.
- = Flow at time , in cfs.
- = Peak flow.
- = falling limb coefficient
- = storm duration
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