Question 7 Not yet The Los Angeles DWP has been diverting water from Lee Vining

Question

Question 7 Not yet The Los Angeles DWP has been diverting water from Lee Vining Rush, and Mill Creeks (below the gaging stations) for many years running the diverted water through the Owens Valley aqueduct to Los Angeles. These diversions average 103,408 acre- feet per year (ac-ft/yr). Note: 1 m?= 0.000811 acre-foot. Points out of 1.00 Flag question Taking into account these diversions, calculate the average annual flow into Mono Lake from these three creeks in cubic meters per year (m3/yr) Select one: a. 1.28 x 108 m3/yr O b. 1.27508 x 108 m3/yr c. 1.55 x 10 m3lyr d. 1.2 x 107 m3/yr e. 1.56 x 10 mlyr O

Explanation / Answer

1) There is simply a unit conversion to be done and nothing else.

0.000811 acre- foot = 1 m3

So,

103,408 acre feet = 103408/0.000811

= 127,506,782 m3

Thus 103,408 acre-feet per year also means 1.27508×108 m3 /year. After rounding it off it in form of exponent.

2) The lowering of the lake level resulted in a change of storage of -102,457,272 m3 in 10 years.

Average annual change in storage= - 102457272/ 10

= -10245727.2 m3 / year.

3)Please mention the values precipitation value for Mono lake from question-4. And use the following formula to calculate.

P = R+ E + delta S.

Where P = precipitation

E=evapotranspiration

R= stream flow

Delta S = change in storage.

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