WMS:Modified Rational Hydrograph: Difference between revisions
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The Modified Rational Hydrograph also assumes that the time to peak is equal to the | The Modified Rational Hydrograph also assumes that the time to peak is equal to the <math>t_c</math>, but allows for the duration of the storm to be longer than <math>t_c</math>, 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. | ||
[[Image:WMSImage80.gif]] | [[Image:WMSImage80.gif]] | ||
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where: | where: | ||
* | * <math>t_c</math> = time of concentration. | ||
* Q = Flow at time t, in cfs. | * <math>Q</math> = Flow at time <math>t</math>, in cfs. | ||
* | * <math>Q_p</math> = Peak flow. | ||
* r = falling limb coefficient | * <math>r</math> = falling limb coefficient | ||
* | * <math>s_d</math> = storm duration | ||
Revision as of 23:13, 7 March 2013
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.
where:
- = time of concentration.
- = Flow at time , in cfs.
- = Peak flow.
- = falling limb coefficient
- = storm duration
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