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Unformatted text preview: KARST LANDSCAPES ** Groundwater * 2nd largest potential source of freshwater (22%) * accumulates by percolation through the soil & rock * how well it percolates is controlled by: Porosity & Permeability P Porosity: the percentage of the total volume of a rock or soil that consists of pore space (spaces within a rock) t Permeability: capacity of a material to transmit fluids or how well fluids will move through it ** water passes through the zone of aeration , a permeable layer; has a permeability rate > .01m/day ** collects in the zone of saturation , which is above an impermeable layer i (rate < .01m/day) * the water table is the upper limit of the zone of saturation u * this zone of saturation may be an unconfined aquifer , with a permeable layer above & an impermeable layer below p * or a confined aquifer which has an impermeable layer above & below it, & is recharged in select places * may develop other features: * artesian well: a flow of water onto the surface under pressure from a confined aquifer * spring : a surface flow of water that emerges from underground, not under pressure from an unconfined aquifer * stream: water flowing on the surface, in a watercourse, where the water table is above the surface; permanent or temporary...
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- Spring '08
- Geography, Aquifer, Limestone, cave, Sinkhole