Q3. It was rained on a basin, where the soil has a k constant of 1.7, an initial infiltration rate of 3.2 mm/hr, and an infiltration rate of 2.3 mm/hr minutes later. The precipitation depths versus time are tabulated below: t, hr 600 615 600 645 700 715 710 745 g00 815 80 g00 915 2.0 ΣΡ, cm 0.0 0.4 3.8 5.0 5.0 5.0 UH, (m'/s)/cm 0 35 10 65 85 75 50 35 25 18 12 6 a) Obtain Horton's infiltration equation (10 points), b) Calculate the depth of total infiltrated water, the depth of surface runoff, and the runoff coefficient (20 points),
Q3. It was rained on a basin, where the soil has a k constant of 1.7, an initial infiltration rate of 3.2 mm/hr, and an infiltration rate of 2.3 mm/hr minutes later. The precipitation depths versus time are tabulated below: t, hr 600 615 600 645 700 715 710 745 g00 815 80 g00 915 2.0 ΣΡ, cm 0.0 0.4 3.8 5.0 5.0 5.0 UH, (m'/s)/cm 0 35 10 65 85 75 50 35 25 18 12 6 a) Obtain Horton's infiltration equation (10 points), b) Calculate the depth of total infiltrated water, the depth of surface runoff, and the runoff coefficient (20 points),
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Q3. It was rained on a basin, where the soil has a k constant of 1.7, an initial infiltration rate of 3.2 mm/hr, and an
infiltration rate of 2.3 mm/hr minutes later. The precipitation depths versus time are tabulated below:
t, hr
600
615
630
645
700
715
730
745
800
815
80
845
900
915
| ΣΡ, cm
0.0
0.4
2.0
3.8
5.0
5.0
5.0
UH, (m/s)/cm o
10
35
65
85
75
50
35
25
18
12
6.
2
a) Obtain Horton's infiltration equation (10 points),
b) Calculate the depth of total infiltrated water, the depth of surface runoff, and the runoff coefficient (20 points),
c) 30-minute unit hydrograph (UH) ordinates are also tabulated above. Obtaining 15-minute UH and neglecting the losses
except for the infiltration, determine the direct runoff hydrograph. (30 point).
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