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For a drainage basin of 600 km, isohyetals drawn for a storm gave the following data: Isohyetals (interval) (cm) 12-9 9-6 Inter-isohyetal area (km)

For a drainage basin of 600 km, isohyetals drawn for a storm gave the following data: Isohyetals (interval) (cm) 12-9 9-6 Inter-isohyetal area (km) 128 120 Estimate the average depth of precipitation over the catchment. 15-12 92 6-3 175 3-1 85

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