EARTHSC 1G03 Lecture Notes - Lecture 26: Porosity, Aquifer, Igneous Rock
19 Apr 2017
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Document Summary
Groundwater consists of: about 95% of the fresh water on earth, 1. 05% of the total water on earth, about 26% of canadian water use, about 20% of us water use. Groundwater is leeched into the ground by rainfall and eventually runs back into the ocean. Unsaturated zone pores of rock/sediment filled with water: water and air fill pores. Water table upper limit of the saturated zone. Water percolates down to the water table. Position of the water table depends on seasonal factors. In general, only water in the saturated zone is considered to be. Water infiltrates from the rainfall etc. , through the soil. Porosity: the fluid storage capacity of rock or sediment. Permeability: the ability to transmit that fluid: the volume of water that can move through a given cross- sectional area per unit time, can also refer to connectedness of fractures in a nonporous igneous rock. Very fine sediments, like clay, typically have low permeability.
