A 200 km² watershed has a lag time of 100 minutes. Baseflow is considered constant at 20 cm. The watershed has a CN of 72% and 30% of imperviousness. Use HEC-HMS to determine the direct runoff for a storm using the SCS UH method. Precipitation data are presented in Table 12. 5.

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TABLE 12.5 Precipitation data for Problem 2 2000-01-01, 2000-01-01, Date 00:00 03:00 2000-01-01, 06:00 2000-01-01, 09:00 2000-01-01, 12:00 Incremental rainfall (cm) 0 0.5 1.25 1.25 0.5