GEOL107 Lecture Notes - Lecture 11: Hydraulic Head, Aquifer, Aeration
2 Oct 2018
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Document Summary
Is incredibly important (and most abundant) freshwater resource to earth"s humans. Flows slowly (typically centimeters or inches per day) Flows in direction determined by changes in hydraulic head (water pressure relative to elevation datum) - may not always flow downhill (mostly does, but follows pressures) Rivers and streams typically flow at km/hour. Measure of the amount of void spaces in material. Measure of interconnectedness of void spaces in material. Material through which water can easily flow. Material through which water cannot easily flow. Doesn"t have boundary at it"s top or bottom (generally top is open) Pores filled with air or partially filled with water/air) Boundary between zone of aeration and zone of saturation. Occurs where, due to lens of sediments acting as aquiclude, secondary water table is located above main water table. Drill into opening - to a saturated zone. Local lowering of water table around well due to removal (pumping) of groundwater to surface.
