Unit Hydrographs of Different Duration

For a given unit hydrograph of a specific duration, another one with different duration can be derived for the same watershed by two methods.

Lagging Method Using a unit hydrograph of duration a hours, another one with duration b hours can be obtained by laggingUHa by a hours as many as b/a times and superposing all these hydrographs together. The sum of these hydrographs