| Unit hydrograph (UH) (contd..) |
| The unit hydrograph is a simple linear model that can be used to derive the hydrograph resulting from any amount of excess rainfall. The following basic assumptions are inherent in this model : |
- Rainfall excess of equal duration are assumed to produce hydrographs with equivalent time bases regardless of the intensity of the rain.
- Direct runoff ordinates for a storm of given duration are assumed directly proportional to rainfall excess volumes.
- The time distribution of direct runoff is assumed independent of antecedent precipitation.
- Rainfall distribution is assumed to be the same for all storms of equal duration, both spatially and temporally.
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