April 29 2016
April 29 2016 GEO 100
Popular in Physical Geology
Popular in Geology
This 3 page Class Notes was uploaded by samantha Flavell on Saturday April 30, 2016. The Class Notes belongs to GEO 100 at State University of New York at Oswego taught by Rachel Lee (P) in Fall 2015. Since its upload, it has received 17 views. For similar materials see Physical Geology in Geology at State University of New York at Oswego.
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Date Created: 04/30/16
April 29, 2016 Geo 100800 Prof. Nandini Kar Mines and Quarries Typically Work Below water Table *When worked, belowsurface mines and quarries have to be actively pumped. *Stop working and they fill up with water to the height of the water table The Water Table *The water table is the top of the zone of saturation *Water table position changes with rainfall During seasonally rainy periods the water table rises During prolonged droughts, the water table falls *Ponds dry up if the water table falls below the Ponds bottom Water Table Topography *The water table is not flat, it is a sloping surface *The water table is a subdued replica of the topography The water table is high where the land is high The water table is low where land is low *Water flows from higher to lower elevations *Typography is useful for estimating groundwater flow Influent and Effluent *When groundwater flows into streams they are called Effluent *When the water table drops, streams become Influent and water leaks from the stream bed into the ground Wetlands *Wetlands are areas of low topography (poor drainage) where the water table approaches the Earth’s surface. They include coastal regions (salt marshes), swamps and seasonal ponds **They are classified based on characteristic Oxygenpoor soil, specially adapted organisms and water coverage during the nominal growing season. Perched Water Table *Perched aquifers are common since the geology of the near surface can be fairly complex. *Parts of an aquifer can become perched as a result of slight variations in the clay content of sediments. *clayrich sediments tend to be impermeable Groundwater Moves: often very slowly *Groundwater flows due to variation in pressure below ground Springs *Springs and seeps appear where geological boundaries intersect the Earth’s surface Artesian Flow *In some areas groundwater is under pressure in a confined aquifer. This results in artesian flow, where water can rise to the surface without pumping Characteristic US Aquifers *Great Plains: Water derived from the Colorado Front Range *Atlantic Coast: Water moves through young, poorly lithified sediment *Basin and Range: Waters concentrate in sands of alluvial fans
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