# Water and Wastewater Systems (242.605) Assignment 1 – Stormwater, Water Supply and Demand

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MonthFlow Volume ( x 104m³)June0.52.50.5July90.50.5August50.50.5September0.50.51.5October0.50.50.5November0.50.511.5December0.542January0.554February1.5135March2101April2100.5May1020.5Note: Factor F is the last digit of your ID. If your ID is 1234567, then (1+F/100) = 1.07.Question 2: Water Balance (Total 8 marks) A 4,000 km² catchment receives 102 cm of precipitation in one year. The average flow of the river draining the catchment is 34.2 m³/S. Infiltration in estimated to be 5.5 x 10^-7 cm/S and evapotranspiration is estimated to be 40 cm/yr. Determine the change in storage in the catchment over one year. The ratio of runoff to precipitation is termed the runoff coefficient. Compute the runoff coefficient for this catchment.

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