WMS:Rational Hydrograph

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 $2t_{c}$ as shown below. This method is chosen by specifying the Modified Hydrograph Method using 1.0 for the recession limb coefficient and $t_{c}$ for the storm duration.

Related Topics

• Computing Hydrographs with Rational Method
• Rational Method Equation