2. A small watershed consists of 2 km² of forest area (c = 0.1), 1.2 km² of cultivated area (c = 0.2) and 1 km² under grass cover (c = 0.35). A watercourse falls by 20 m in a length of 2 km. The 807 0.2 (t +12) ⁰.5 Estimate the peak rate of runoff for a 25-year frequency. IDF relation for the area may be taken as: I = - ; I in cm/hr, T- yr, t in minutes. P-R-[I = 15

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