Lecture7 - Water Budget IV: Soil Water Processes P = Q + ET...

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Water Budget IV: Soil Water Processes P = Q + ET + G + ΔS
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Infiltration Infiltration capacity: The maximum rate at which water can enter soil. Infiltration capacity curve: A graph showing the time-variation of infiltration capacity if the supply were continually in excess of infiltration capacity. Infiltration rate The rate at which infiltration takes place expressed in depth per unit time. Converted to volume (ft3/s, m3/d) by multiplying rate times area Assumes spatial homogeneity of rate
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Infiltration Movement of water into the soil Water moves through spaces between soil particles (SLOW) Water moves through old root channels, animal burrows, and between soil blocks (FAST) Percolation is the movement of water through
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Wetting Profiles
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Matrix Potential Capillary forces Water has high surface tension Leads to zone above the “water table” that where pores are saturated Capillary Rise Varies from a few cm to m (!) Texture dependent Also accelerates infiltration into unsaturated soils
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Matrix + Gravity When soil is saturated
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Lecture7 - Water Budget IV: Soil Water Processes P = Q + ET...

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