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Category A <br />Discharge: > 621 m3/s (22,000 cfs) <br />Purpose: Overtop the floodplain, completely mobilize the bed surface <br />Duration: 5 days per year, averaged over a period of several years <br />Frequency: One out of every three years <br />Category B <br />Discharge: > 283 m3/s (10,000 cfs) <br />Purpose: Initiate bed material transport, inundate low-lying bars <br />Duration: 30 days per year, averaged over a period of several years <br />Frequency: Every other year <br />Category C <br />Discharge: 115 -155 m3/s (4,000 - 5,500 cfs) <br />Purpose: Maintain sand in suspension over riffles <br />Duration: 10 days per year, on the receding limb of the annual hydrograph; in typical <br />years, this would occur in the period from late June to early July <br />Frequency: Every year <br />iv