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<br />have identified organics, solids, nutrients, heavy metals, and <br /> <br /> <br />micro-organisms as important components of urban stormwater <br /> <br /> <br />runoff. <br /> <br /> <br />Urban surface waters are typically collected in storm <br /> <br /> <br />sewers, combined sewers, or may appear as diffuse surface waters <br /> <br /> <br />which flow into the nearest stream or artificial channel. Recent <br /> <br /> <br />studies have found that the impact of this waste source on water <br /> <br /> <br />quality management objectives is significant. As a result, many <br /> <br /> <br />cities have initiated programs to cope with urban stormwater <br /> <br /> <br />runoff problems. <br /> <br /> <br />This research was undertaken to evaluate the characteris- <br /> <br /> <br />tics of stormwater runoff. Major emphasis was placed on charac- <br /> <br /> <br />terizing the runoff from urban areas under rainfall and snowmelt <br /> <br /> <br />conditions. Brief attempts were made at analyzing the impact <br /> <br /> <br />from mountain watersheds and agricultural lands. The aim of the <br /> <br /> <br />study was to provide a basis for developing a more complete <br /> <br /> <br />picture of the need for stormwater pollution abatement in Colorado <br /> <br /> <br />and the mountain states. <br /> <br /> <br />The urban runoff portion of the study was conducted in the <br /> <br /> <br />City of Boulder, Colorado which is serviced by separate storm <br /> <br /> <br />and sanitary sewer systems. Hence, the urban stormwater aspects <br /> <br /> <br />of the study are limited to runoff collected by separate storm <br /> <br /> <br />sewer systems and the characteristics of stormwater runoff refer <br /> <br /> <br />to separate storm sewer discharges. <br /> <br /> <br />The specific objectives of the research were to characterize <br /> <br /> <br />urban stormwater runoff under the conditions of rainfall and <br /> <br />2 <br /> <br />. <br /> <br />, <br />