6. A certain catchment the depletion curve of the hydrograph at the outlet may be described with the equation 4.11. The flood hydrograph Q (mm/d) at the outlet, as given below, was produced by a rainstorm of 50 mm.

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6. A certain catchment the depletion curve of the hydrograph at the outlet may be described with the
equation 4.11. Theflood hydrograph Q (mm/d) at the outlet, as given below, was produced by a
rainstorm of 50 mm.
I 2 3 4 s 6 7 8 9 10 11 12 13 14
Q (mm/d) 1.72 1.50 1.31 1.14 1.00 6.00 10.0 6.00 4.00 | 3.00 2.62 2.29 2.00 1.75
Day
a Plot the hydrograph and separate direct runoff from base flow by a straight line.
b Estimate the direct runoff, in mm.
c Estimate the total base flow contribution from this rain storm.
[Answer: b) 18mm, c) ± 25 mm]
Transcribed Image Text:6. A certain catchment the depletion curve of the hydrograph at the outlet may be described with the equation 4.11. Theflood hydrograph Q (mm/d) at the outlet, as given below, was produced by a rainstorm of 50 mm. I 2 3 4 s 6 7 8 9 10 11 12 13 14 Q (mm/d) 1.72 1.50 1.31 1.14 1.00 6.00 10.0 6.00 4.00 | 3.00 2.62 2.29 2.00 1.75 Day a Plot the hydrograph and separate direct runoff from base flow by a straight line. b Estimate the direct runoff, in mm. c Estimate the total base flow contribution from this rain storm. [Answer: b) 18mm, c) ± 25 mm]
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