Rivers_flooding_2

Rivers_flooding_2 - River Flooding Cause of flooding runoff...

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River Flooding Cause of flooding runoff exceeds the river’s ability to carry water in its channel Channel size (width, depth) develops to accommodate the average annual maximum flow Runoff determined by: Quantity and duration of rainfall event (or snowmelt) Infiltration capacity (soil type, vegetation) Topography (steepness of slopes)
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Stage height of water in or above channel Bankfull stage stage that just fills channel Flood stage any stage above bankfull Crest maximum stage in flood event
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Gauging station Measures stage at a given location Gauging station
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Measuring stream discharge at gauging station Stage is converted to discharge using rating curve Record of discharge vs time is hydrograph Hydrograph Discharge (cfs) Stage (ft) Discharge (cfs)
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There are approximately 7000 gauging stations in the U.S.
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Realtime Streamflow Conditions 5 10 25 75 90 100 Streamflow (percentile) relative to 30 year average
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Thursday 2/10 0.2 in. rainfall Mon-Tu 2/14-2/15 0.8 in. rainfall
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Flash flood (also called upstream flood) Downstream flood Small areas affected Large areas affected
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Hydrograph for flash flood following brief rainstorm (Texas) Gauging station 1 Gauging station 2
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Downstream flood event on Savannah River system
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Rivers_flooding_2 - River Flooding Cause of flooding runoff...

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