A water-supply reservoir has been lined with clay to limit leakage (infiltration) through the bottom. An assessment of the effectiveness of the liner is required to fulfill the terms of the construction contract. The following data have been collected for a test week:

The surface area of the lake is 40 hectares. The reservoir surface elevation fell 15.5 cm during the week. If the evaporation for the week was estimated to be 3 cm, what was the amount of leakage in cubic meters for the week?

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Day Parameter Stream inflow (msec Stream outflow (msec 0. City use (m3/sec) Precipitation (em) 0.0 0.2 0.4 0.5 . 0.2 0.1 0.1 03 02 0 0.1 0.3 0.2 0.3 0. 03 0.3 0.3 0.0 7.0 2.5 0.0 00 0.0 0.30.2 0. 0.0