AGRON 160 Lecture 5: Water Lecture 5

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Water moves due to potential energy gradients gravity is the primary force. Infiltration: movement of water from soil surface into the soil: replenishes groundwater increases soil moisture. Recharge: movement of water from unsaturated to saturated zone: groundwater flow: movement of water within saturated zone. Permeability: ability of a material to transmit fluids. Soils and sediments (unconsolidated): clay= smallest grain size. Lowest permeability: silt, sand= largest grain sizes. Porosity: total volume of pore space that can fill with water: sand: 25-40, silt: 35-50% , sandstone: 5-30%, limestone: 1-20% Permeable vs. impermeable: degree to which pore spaces are connected determines movement of water in material. 0. 06 % of all water on earth. Water found within the pore spaces of geologic material beneath the surface of the. Saturated zone: pore spaces are filled with water. Can be found within a few feet to hundreds of feet. Geologic unit that stores and transmits water at rates reasonable enough to supply a well.

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