Question

Identify the correct statements :
Flood hydrograph of two meteorologically homogeneous catchments of equal area A and B under rainfall are shown in figure below. If all other factors remains the same, relative to A catchment B has

1. a low drainage density
2. considerable large forest cover
3. reduced catchment slope and stream slope
4. has an elongated shape
Of the above, the correct statements are

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

Answer 1

The correct option is D 1, 2, 3 and 4 are correct

• Low drainage density results in increased base time (also increase in time of peak flow)
• Large forest cover reduces the runoff discharge.
• Reduced catchment slope and stream slope delay the time of peak flow.