At a water elevation of 6391ft, Mono Lake has a volume of 2,939,00 ac-ft, and a surface of 48,100 ac. Annual inputs to the lake include 8in. of direct precipitation, runoff from gauged streams of 150,000 ac-ft per year, and ungauged runoff and ground-water inflow of 37,000 ac-ft per year. Evaporation is 45in. per year.

A. Make a water budget showing inputs, in ac-ftper year and outputs in ac-ft per year. Does the input balance the output?

B. Will the average lake level rise or fall from the 6391ft elevation over the long-term?

C. What would be the lake surface area when the inputs blance the outputs? ( Assume that the volume of gauged and ungauged runoff and ground-water inflows remain constant with a change in lake surface area).

D. What is the residence time for water in Mono Lake when the water surface is at 6391ft?