EARTHSC 2GG3 Chapter Notes - Chapter 1: Surface Runoff, Hydrograph, Silt
15 Apr 2018
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Document Summary
Most floods in north america occur in spring. This is a result of ice jams, a melting snowpack, and rain. A flood officially begins when a river achieves bankfull discharge (the discharge at which point water first floor out of the channel) They are produced by rain of long duration or by rapid melting of a snowpack. They are characterized by a snow but substantial rise in discharge. Outburst floods can be caused by the sudden draining of lakes that were originally dammed by a glacier or other material. These include both earthen and concrete levees, floodways, and storm-water retention basins. Breaks in levees can cause high energy flows of water that quickly inundate an area. The level the river surface must reach in order for it to cause property damage. A graph showing changes in discharge or changes in stage over time. The average time between floods of a certain size.
