A storm with constant rainfall intensity (i = 12 mm per hour, duration Tp = 6 hours) precipitates on a soil surface with an initial moisture deficit Δθ 0.32. The conductivity and the wetting front suction head of the soil are = 6 mm/hr and 4 =15 mm, respectively. = (1) If there is no surface ponding at the beginning of precipitation, please estimate the time it takes for water to pond on the surface (tp). (2) Estimate the cumulative infiltration depth (F) at the ponding time. (3) If rainfall intensity were much higher, and surface ponding occurred immediately as precipitation started, please estimate the time it took to infiltrate F = 4.8 mm, and the infiltration rate (f) at that time.
A storm with constant rainfall intensity (i = 12 mm per hour, duration Tp = 6 hours) precipitates on a soil surface with an initial moisture deficit Δθ 0.32. The conductivity and the wetting front suction head of the soil are = 6 mm/hr and 4 =15 mm, respectively. = (1) If there is no surface ponding at the beginning of precipitation, please estimate the time it takes for water to pond on the surface (tp). (2) Estimate the cumulative infiltration depth (F) at the ponding time. (3) If rainfall intensity were much higher, and surface ponding occurred immediately as precipitation started, please estimate the time it took to infiltrate F = 4.8 mm, and the infiltration rate (f) at that time.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:**Educational Content: Understanding Rainfall Infiltration**
A storm with constant rainfall intensity (\(i = 12\) mm per hour, duration \(T_D = 6\) hours) precipitates on a soil surface with an initial moisture deficit \(\Delta\theta = 0.32\). The conductivity and the wetting front suction head of the soil are \(K = 6\) mm/hr and \(\psi = 15\) mm, respectively.
1. **Time to Surface Ponding (\(t_p\))**:
- If there is no surface ponding at the beginning of precipitation, estimate the time it takes for water to pond on the surface (\(t_p\)).
2. **Cumulative Infiltration Depth (\(F\))**:
- Estimate the cumulative infiltration depth (\(F\)) at the ponding time.
3. **Immediate Surface Ponding Scenario**:
- If rainfall intensity were much higher, and surface ponding occurred immediately as precipitation started, estimate the time it took to infiltrate \(F = 4.8\) mm, and the infiltration rate (\(f\)) at that time.
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