A catchment area of 140 km received 120 cm of rainfall in a year. At the...
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A catchment area of 140 km received 120 cm of rainfall in a year. At the outlet of the catchment the flow in the stream draining the catchment was found to have an average rate of 2.0 m/s for 3 months, 3.0 m/s for 6 months and 5.0 m/s for 3 months. (i) What is the runoff coefficient of the catchment? (ii) If the afforestation of the catchment re- duces the runoff coefficient to 0.50, what is the increase in the abstraction from precipi- tation due to infiltration, evaporation and transpiration, for the same annual rainfall of 120 cm? A catchment area of 140 km received 120 cm of rainfall in a year. At the outlet of the catchment the flow in the stream draining the catchment was found to have an average rate of 2.0 m/s for 3 months, 3.0 m/s for 6 months and 5.0 m/s for 3 months. (i) What is the runoff coefficient of the catchment? (ii) If the afforestation of the catchment re- duces the runoff coefficient to 0.50, what is the increase in the abstraction from precipi- tation due to infiltration, evaporation and transpiration, for the same annual rainfall of 120 cm?
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