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Select the correct option considering the following statements.  a) The effective rainfall is uniformly distributed within its duration of specified period of time. b) The effective rainfall is distributed throughout the whole area of the drainage basin.

Select the correct option considering the following statements.  a) The effective rainfall is uniformly distributed within its duration of specified period of time. b) The effective rainfall is distributed throughout the whole area of the drainage basin. Correct Answer Both the statements (a) and (b) are true

Concept:

The following assumptions are made while using the unit hydrograph principle:

1. Effective rainfall should be uniformly distributed over the basin, that is, if there are ‘N’ rain gauges spread uniformly over the basin, then all the gauges should record almost the same amount of rainfall during the specified time.

2. Effective rainfall is constant over the catchment during the unit time.

3. The direct runoff hydrograph for a given effective rainfall for a catchment is always the same irrespective of when it occurs. Hence, any previous rainfall event is not considered.

This antecedent precipitation is otherwise important because of its effect on soil-infiltration rate, depressional and detention storage, and hence, on the resultant hydrograph.

4. The ordinates of the unit hydrograph are directly proportional to the effective rainfall hyetograph ordinate.

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