Discharge. Three large creeks flow into Mono Lake from the Sierra Nevada. These

Question

Discharge. Three large creeks flow into Mono Lake from the Sierra Nevada. These creeks are gaged by the Los Angeles Department of Water and Power (DWP), and have the following average annual discharge:
ERTH 330: California Water Spring 2018

Lee Vining Creek 83.5 cfs (cubic feet per second (ft3/sec)) Rush Creek   42.7 cfs Mill Creek   34.0 cfs
Calculate the combined average annual discharge of these three creeks in cubic meters per year (m3/yr). Note: 1 m3 = 35.3147 cubic feet (ft3), and 1 year = 31,536,000 seconds. USE THE CORRECT ORDER OF OPERATIONS (PEDMAS). a) 1.46 x 108 m3/yr b) 1.51 x 108 m3/yr c) 1.43 x 108 m3/yr d) 1.431 x 108 m3/yr e) 1.510 x 107 m3/yr

Explanation / Answer

Ans - d) 1.431 x 108 m3/yr

Given three cricks discharges

Lee vining creek discharge = 83.5 cfs

Rush creek discharge = 42.7 cfs

Mill creek discharge = 34 cfs

total discharge = 83.5 + 42.7 + 34 = 160.2 cfs

given

1 year = 31,536,000 seconds

total discharge in 1 year = 160.2 x 31,536,000 = 5052067200 ft3/ yr

1 m3 = 35.3147 cubic feet

total discharge in m3/ yr = 5052067200 / 35.3147 = 1.431 x 108 m3/yr

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