The Green and Ampt infiltration equation is a loss function used to compute the cumulative infiltration, F (cm) for a given infiltration rate, f (cm/hr). Recall that, f = Ks • (1 – (M • Wf)/F). For the given soil properties and infiltration rate, answer the following.
K | 1 | cm/hr |
Wf | -11 | cm |
M | 0.2 |
|
t (hr) | f (cm/hr) | F (cm) |
0 | 0 | 0 |
0.01 | 15.34 | 0.15 |
0.25 | 3.32 | 0.95 |
0.50 | 2.42 | 1.55 |
0.75 |
| 2.07 |
(a) Compute the infiltration rate, f (cm/hr) for F = 2.07 cm, and show your computations.
(b) Compute the cumulative infiltration resulting from a constant rain rate of 0.5 cm/hr for 1 hr.
(c) At saturation, what is the infiltration rate in cm/hr? Justify.
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