CE361 - Lecture 12

CE361 - Lecture 12 - Water Resources EngineeringLecture 12...

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1 Water Resources Engineering- Lecture 12 1 Prepared by T. Wagener & P. Reed Penn State University Hydrologic Processes 2
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2 Content 1. Infiltration 1. Unsaturated Flow 2. Infiltration Methods (7.4.2 & 7.4.3) 3 Soil Moisture Profile 4 Figure 7.4.3 (p. 237) Moisture zones during infiltration (from Chow et al. (1988)).
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3 Soil Moisture Profile What value would θ i have if the soil had been saturated, but has now completely drained through gravity forces? 5 Figure 7.4.4 (p. 237) Moisture profile as a function of time for water added to the soil surface. Infiltration Terminology • The infiltration rate f is the rate at which water enters the soil surface [in/hr or cm/hr] • The potential infiltration rate is the rate of infiltration when water is ponded on the soil surface (no ponding means the infiltration rate is less than potential) • The cumulative infiltration F is the accumulated 6 depth of infiltrated water 0 () ( ) t dF t Ft f d and ft dt ττ ==
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4 Ponding Time 7 Figure 7.4.8 (p. 243) Ponding time. This figure illustrates the concept of ponding time for a constant intensity rainfall. Ponding time is the elapsed time between the time rainfall begins and the time water begins to pond on the soil surface.
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CE361 - Lecture 12 - Water Resources EngineeringLecture 12...

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