A measured hydrograph for the Little Miami River emptying into
the Miami River is approximately triangular in shape. The peak
discharge occurs 2 hours into the storm (storm duration of 2 hours)
and measures 350 cfs. There is no base flow before the event and
the discharge drops to zero 6 hours AFTER the peak. The drainage
area is 650 acres (1 acre = 43,560 ft2 ).
a)Sketch the storm hydrograph
b)Sketch the unit hydrograph
c)During the storm someone reported there were 3 inches of rain
measured in the area. If the drainage area is a predominantly
grassy area (C=0.3) does this make sense? If not, are his gauges
measuring too high or too low? Show calculations to support your
answer of too high or too low
d)If a 2 -hour storm produces 3 inches of runoff and is
immediately followed by a 2-hour storm of 2.5 inches of runoff,
what is the storm peak discharge (in cfs)?
Flow (cfs) 1000 900 800 700 600 500 400 300 200 100 0 0 1 2 3 4 5 6 7 8 9 Time (hours) 10
A measured hydrograph for the Little Miami River emptying into the Miami River is approximately triangular in shape. The
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A measured hydrograph for the Little Miami River emptying into the Miami River is approximately triangular in shape. The
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