Please Show work! RUNOFF Determine the average annual runoff (m2) from all strea

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Please Show work!

RUNOFF Determine the average annual runoff (m2) from all streams flowing into Mono Lake. 1. Three large streams flow into Mono Lake, all from the Sierra Nevada (Fig. 1.2). These streams are gaged by the Los Angeles Department of Water and Power (DWP), and have the following average annual runoff. Lee Vining Creek Rush Creek Mill Creek 87.3 cfs (cubic feet per second) 44.8 cfs 37.0 cfs What is the combined average annual runoff of these three streams, in m3? 2· The Los Angeles DWP has been diverting water from Lee Vining, Rus stations) for many years, running the diverted water through the Owens Valley aqueduct to Los Angcles. These diversions average 105, 305 acre-ft per year. h, and Mill Creeks (below the gaging Taking into account these diversions, what is the average annual flow into Mono Lake from these three streams, in m3? 3. Two small streams, not gaged, were measured with simple weirs to determine their runoff. The smallest stream, Andy Thompson Creek, was Triangular-notch Weir (90°) measured with a 90° triangular-notch weir. This type of weir is most useful for discharges of less than 1 cfs. The formula for a weir with this geometry is Q = 2.54e/2 where Q is in cfs and h is in ft. Q = 2.54 2.5 The measurement, taken after flow is stabilized, showed the water surface 6.9 inches above the notch. Determine runoff (m3/yr). Q in cfs h in ft

Explanation / Answer

Q 1: Average runoff per second = average runoff (lee vining creek+rush creek +mill creek)

= 87.3+44.8 + 37

= 169.1 cubic feet

Now if feet = 0.3048 m

Hence 1 cu ft = 0.3048^3 cu. m = 0.028317 cu m

Thus in metric units, average inflow to Mono lake = 169.1*0.028317 = 4.7884047 cu m /s

Thus total annual discharge combined = 4.7884047*365.25*24*60*60 = 151110560 cubic meter

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