Question

An earthen dam is 200 m across (i.e., the distance from the upstream face to the downstream face) and underlain by an impermeable bedrock. The average hydraulic conductivity of the material of which the dam is constructed is 0.065 m/day. If the water surface elevations in the reservoir and the tail water are 25 m and 4.5 m, respectively, estimate the magnitude of leakage from the reservoir to the tail water per 100-m width of the dam.

Fig: 1