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To derive the total flood hydrograph at a catchment outlet from an isolated storm, the order in which the following methods are applied, from the first method to the last method, is P. Obtaining the hyetograph Q. Addition of baseflow R. Estimation of initial and infiltration losses S. Application of unit hydrograph

1. P R S Q
2. P Q R S
3. R P S Q
4. P S Q R

Correct answer: P R S Q

Solution

The correct order begins with obtaining the hyetograph to visualize rainfall data, followed by estimating initial and infiltration losses to determine effective rainfall. Next, the unit hydrograph is applied to convert effective rainfall into runoff, and finally, baseflow is added to obtain the total flood hydrograph.

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