The following four hydrological features have to be estimated before one can compute the flood hydrograph at any catchment outlet:
1. Unit hydrograph
2. Rainfall hydrograph
3. Infiltration index
4. Base flow
The correct order in which they have to be employed in the computations is1
1, 2, 3, 4
2
2, 1, 4, 3
3
2, 3, 1, 4
4
4, 1, 3, 2