4.10. A detention pond needs to be designed with a total capacity of 30 ac-in. of stor- age. The inflow hydrograph for the pond is given in Figure P4-10. Assume that that pond is initially 50% full and outflow will cease when the pond is again 50% full. Graphically determine the peak outflow from the pond assuming a linear rise and fall in the outflow hydrograph. Draw the outflow hydrograph. At what time does outflow cease? (Hint: The outflow hydrograph will peak at the intersection of the inflow and the outflow hydrographs. Also, make use of the fact that the available volume for storage is equal to the area between the two triangular hydrographs and must be equal to 50% of the storage.) vita alepoltaler ogradar ydw nislqz (0)
4.10. A detention pond needs to be designed with a total capacity of 30 ac-in. of stor- age. The inflow hydrograph for the pond is given in Figure P4-10. Assume that that pond is initially 50% full and outflow will cease when the pond is again 50% full. Graphically determine the peak outflow from the pond assuming a linear rise and fall in the outflow hydrograph. Draw the outflow hydrograph. At what time does outflow cease? (Hint: The outflow hydrograph will peak at the intersection of the inflow and the outflow hydrographs. Also, make use of the fact that the available volume for storage is equal to the area between the two triangular hydrographs and must be equal to 50% of the storage.) vita alepoltaler ogradar ydw nislqz (0)
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:4.10. A detention pond needs to be designed with a total capacity of 30 ac-in. of stor-
age. The inflow hydrograph for the pond is given in Figure P4-10. Assume that
that pond is initially 50% full and outflow will cease when the pond is again
50% full. Graphically determine the peak outflow from the pond assuming a
linear rise and fall in the outflow hydrograph. Draw the outflow hydrograph.
At what time does outflow cease? (Hint: The outflow hydrograph will peak at
the intersection of the inflow and the outflow hydrographs. Also, make use of
the fact that the available volume for storage is equal to the area between the
two triangular hydrographs and must be equal to 50% of the storage.)
2320)
Dar al engin
Flow (cfs)
8
6
4.
2
0
0
0
2 4
68 10
O Time (hr)
12
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