The ordinates of a 4-hour UH of a catchment are given in Table 12. 18. Derive the flood hydrograph in the catchment for the storm figures presented in Table 12. 19.

The storm loss rate (Φ index) for the catchment is estimated as 0. 43 cm/hour. The base flow at the beginning is 10 m³/s and will increase by 1. 5 m³/s every 8 hours until the end of the direct runoff hydrograph.

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TABLE 12.18 Ordinates of 4-Hour UH of Problem 17 Time (hours) Q (m/s) 0 0 22 2 468 25 50 85 125 25 16 18 20 22 22 26 60 36 25 16 10 12 14 160 185 160 110 91 24 26 28 8% 8 0