MD-DE-DC Water Science Center
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Slide 16 of 26
It is particularly important to make discharge measurements when stream stages are high. Such measurements define the upper ends of ratings. As such, they form the basis for flood warning, flood forecasting and estimates of annual flow volumes. The means of making current meter measurements are provided at most USGS gaging stations. Measurements during high stages are often made from bridges or cableways.
Sometimes, it is impossible to make current-meter measurements during large floods. When direct current-meter measurements cannot be made, discharge is measured indirectly by surveying the high-water marks left by the flood and using hydraulic formulas to calculate discharge associated with the peak stage.
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://md.water.usgs.gov/publications/presentations/md-de-dc_rt98/sld016.htm
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Friday, May 30, 2008
