Question

Which of the following principles relate to a Unit Hydrograph?

Select the correct answer using the codes given below:

• A. 1, 2 and 3
• B. 1, 2 and 4
• C. 2, 3 and 4
• D. 1, 3 and 4

Answer 1

The correct option is D 1, 3 and 4

In a given period of effective rainfall, the hydrograph of direct runoff from a basin reflects the combination of rainfall characteristics and physical characteristics of the basin.
Effective rainfall is assumed to be constant and uniformly distributed over the basin, i.e., if there are N rain gauges spread uniformly over the basin, then all the gauges should record almost same amount of rainfall during the specified time.
Also the hydrographs of direct runoff due to effective rainfall of equal duration have the same time base.