WMS:Modified Rational Hydrograph: Difference between revisions
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| Line 5: | Line 5: | ||
where: | where: | ||
* <math>t_c</math> = | * <math>t_c</math> = Time of concentration. | ||
* <math>Q</math> = Flow at time <math>t</math>, in cfs. | * <math>Q</math> = Flow at time <math>t</math>, in cfs. | ||
* <math>Q_p</math> = Peak flow. | * <math>Q_p</math> = Peak flow. | ||
* <math>r</math> = | * <math>r</math> = Falling limb coefficient | ||
* <math>s_d</math> = | * <math>s_d</math> = Storm duration | ||
Revision as of 15:30, 7 April 2016
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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