WMS:Rational Hydrograph: Difference between revisions
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The Rational Unit Hydrograph has a time to peak equal to the time of concentration. Both the rising and receding limbs of the hydrograph have a duration equal to the time of concentration, and therefore the shape of the hydrograph is an isosceles triangle with a time base of < | The Rational Unit Hydrograph has a time to peak equal to the time of concentration. Both the rising and receding limbs of the hydrograph have a duration equal to the time of concentration, and therefore the shape of the hydrograph is an isosceles triangle with a time base of ''2t<sub>c</sub>'' as shown below. This method is chosen by specifying the Modified Hydrograph Method using 1.0 for the recession limb coefficient and ''t<sub>c</sub>'' for the storm duration. | ||
[[Image:RationalHydrograph1.png]] | [[Image:RationalHydrograph1.png]] | ||
Revision as of 20:29, 13 December 2016
The Rational Unit Hydrograph has a time to peak equal to the time of concentration. Both the rising and receding limbs of the hydrograph have a duration equal to the time of concentration, and therefore the shape of the hydrograph is an isosceles triangle with a time base of 2tc as shown below. This method is chosen by specifying the Modified Hydrograph Method using 1.0 for the recession limb coefficient and tc for the storm duration.
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