EARTHSC 2GG3 Lecture Notes - Flood Warning, Strahler Number, Hydrograph
5 Sep 2014
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Document Summary
Lecture 31, november 15, 2013: groundwater, precipitation, and stream flow, some of the precipitation in an area percolates through soil to become groundwater and is collected by rivers and streams. Losing streams lose water into the ground. In wet climates, groundwater flows into gaining streams, ensuring year-round flow. In dry climates, water from streams feeds the groundwater. These losing streams may dry up between rainstorms: areas of moderate to high annual rainfall: Changes in precipitation result in changes to groundwater levels, but stream inflow is generally constant: semi-arid to arid regions: Water from losing streams sinks into ground and streams may dry up between storms. Flash floods can occur after any major or prolonged rainfall. Precipitation and surface runoff: runoff - liquid water that travels over the surface of the earth, moving downward due to the law of gravity, some precipitation flows as surface runoff during torrential rainfall.
