GEOL 1340 Lecture Notes - Lecture 16: Porosity, Land And Water Hemispheres, Rain Gauge
2 Oct 2016
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Over 1/2 return to atm: water on land, evapotranspiration. Transp. in plant: outward mvmt of water thru small openings (stomata) in underside of leaves: runoff. 5% subsurface flow as groundwater: water-balance equation. Deficit occurs if not enough precip. to meet demand. Meteorological: lower precip. , increase t, and decrease in soil moisture. Agricultural: change in soil moisture and weather as affect crop yields. Hydrologic: reservoir levels drop, stream flow decrease and groundwater mining increase. Socioeconomic: water ration, wildfires, etc: groundwater. 50% us pop gets from them: recharge and discharge areas. Found in pores of soil and sediment and narrow fractures in bedrock. Largest reservoir of freshwater that is available to humans. Porosity: % open spaces within given v of rock. Permeability: measure of how easily a rock allows fluids to pass through it. Occurs in areas where precip. seeps decrease to sat zone. Path of flow: aquicludes and aquifers. Aquicludes: rock layer doesn"t transmit water in usable amts.
