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<br />the Front Range were determined to vary from 71 to 386 gallons per person per <br />day (White and others, 1980, p. 29-32), and use rates in the Denver metro- <br />politan area have ranged from 167 to 231 gallons per person per day during <br />1974 to 1982 (U.S. Army Corps of Engineers, 1986a). <br /> <br />Water Disposition <br /> <br />Disposition information consists of water-disposal method and disposition <br />type (fig. 3). Water-disposal method was categorized as eitqer self disposal <br />or public disposal. However, for this study, water-disposal methods were not <br />investigated in great detail. The Colorado State Department of Health <br />provided a listing of about 900 facilities permitted to discharge return <br />flows. These were separated into public-disposal systems (sanitation-district <br />dischargers) and self-disposal systems (other dischargers, primarily <br />industrial). For public-disposal systems, an attempt was made to quantify <br />return flows by using return-flow-measurement data that were available, <br />information about treatment-plant capacities, and information compiled from <br />direct queries with treatment-plant operators. For permitted dischargers <br /> <br /> <br /> <br />EXPLANATION <br /> <br />DELIVERIES. IN <br />MILLION GALLONS <br />PER DAY <br /> <br />D Less than 0.6 <br /> <br />D 0.6 to 2.0 <br /> <br />~c~:12.0 to 10 <br /> <br />10 to 60 <br /> <br />4,,_,,-_, <br /> <br />III Greater than 60 <br /> <br />Figure 5.--Public-supply-system deliveries, by counties, during 1985. <br /> <br />13 <br />