EARTHSC 1G03 Lecture Notes - Lecture 18: Aquifer, Walkerton E. Coli Outbreak, Layer Cake
22 Nov 2016
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Document Summary
Locate, develop and protect aquifers (water supply) Locate suitable future waste disposal sites: glacial deposits in southern ontario. Repeated episodes of glaciation over past 2 million years. Coarse-grained sediment (sands, gravels: groundwater system. Water beneath the surface of the earth. From areas of recharge to areas of discharge (streams and lakes) Aquifer: a rock or sediment that holds and transmits enough water to be useful as a source of water. Aquitard: a rock or sediment with slow rates of water movement. Measure of how readily fluids pass through material. Glacial deposits from a "layer cake" of aquifers and aquitards. 80% rural wells in southern ontario contaminated by pesticides. Contamination by untreated agricultural sewage was responsible for walkerton tragedy (2000) Most often work well but release chlorides, nitrates, potassium, organic carbon from cleaning fluids. Produces and stores wide range of chemicals. 1 l of gas can contaminate 4, 000, 000 l of groundwater.
