Data from nonpoint source monitoring studies are usually reduced to a pollutant load per storm basis. An event expected concentration (EMC) is multiplied by the value of runoff. EMCs are calculated by integrating the polluto-graph (instantaneous load with time) with the hydrograph. After sampling several storms, these load per storm data are used to estimate annual load from the basin. It is assumed that the monitored storms are representative samples of storms usually occurring in the basin during the year (Whipple 1983).
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