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4 - • Source of half of drinking water for U.S population...

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The Nature of Underground Water Subsurface water Water contained within soil, sediments, and rock Primary inputs to the underground subsystem is precipitation and snowmelt that infiltrates into the ground. Recharges Water first passes through the zone of aeration Uppermost zone Pore spaces in soil and rocks contain air and water. (soil water= water in the zone of aeration) Rarely becomes saturated and if so, it is temporary due to large rainfall event or snowfall. Water drains downward via gravity to lower levels called percolation. Zone of saturation Lowest of the 3 layers of underground water Called groundwater Water table Marks the upper limit of the zone of saturation Depth of water table varies depending on precipitation, outflow, and removal Aquifer – a porous and permeable layer of sediments or rock that acts as a storage medium and transmitter of water. Supply water for human use. Groundwater Utilization Groundwater Vital resource to most of the world
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Unformatted text preview: • Source of half of drinking water for U.S. population • Irrigation consumes bulk (2/3) • Ogalla Aquifer Springs • Natural outflows of groundwater to the surface. Related to landform configuration, level of water table and position of the aquifer. • Spring fed channels • Slope Erosion • The Work of Streams and Stream Gradation • Fluvial Landscapes Fluvial Geomorphology: The study of flowing water as a land-shaping process, together with the study of the resulting landforms. This includes action of channelized and unchannelized flow moving downslope by the force of gravity. Fluvial Landforms: landforms shaped by running water which picks up particles and moves them downslope. Heavy rainfall can lift large volumes of sediment and carry them downstream. Running water erodes mountains and hills, carves valleys and deposits sediment. Fluvial Landform carved out by the Colorado River and its tributaries...
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