Lecture 12

Lecture 12 - Water Resources EngineeringE i i Prepared by...

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Water Resources Engineering- ecture Prepared by T. Wagener & P. Reed Penn State University 1 Lecture 12
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ydrologic Processes Hydrologic Processes 2
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ontent Content filtration 1. Infiltration 1. Unsaturated Flow filtration Methods (7 4 2 & 7 4 3) 2. Infiltration Methods (7.4.2 & 7.4.3) 3
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oil Moisture Profile Soil Moisture Profile 4 Figure 7.4.3 (p. 237) Moisture zones during infiltration (from Chow et al. (1988)).
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oil Moisture Profile What value would θ i have if the soil had been saturated, but has now ompletely drained through gravity Soil Moisture Profile 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.
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nfiltration Terminology 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 ss than potential) less than potential) • The cumulative infiltration F is the accumulated depth of infiltrated water () ( ) t dF t Ft f d and ft t ττ == 6 0 dt
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onding Time Ponding Time t p 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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hanging Infiltration Rate with Time Changing Infiltration Rate with Time f eventually becomes constant. Its alue is close to the saturated value is close to the saturated hydraulic conductivity.
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Lecture 12 - Water Resources EngineeringE i i Prepared by...

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