Simple Lake Mass Balance

A rectangular lake of constant depth, D, has a surface area, A. The annual precipitation is P and annual evapotranspiration is E. This is a terminal lake with streamflow into the lake, S, and no streamflow out.

For,

D = 100 ft

A = 200 acres

P = 0.8 ft

E = 1 ft

S = 40 acre-ft

What is the change in water volume over one year?

Answer