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<br />001082 <br /> <br />Draft - 9/81 <br /> <br />Appendix II <br /> <br />Municipal Treated Water <br /> <br />This appendix explains the reasoning and data behind Table 1 <br /> <br />in the section of Chapter 5 entitled .Municipal Treated Water.. <br /> <br />It discusses how the assumption of 200 gallons per capita per day <br /> <br />(gcd) total demand was reached and deals with both demand and <br /> <br />consumption of municipal treated water for industrial use, indoor <br /> <br />use and outdoor use. The term .demand. refers to the total <br /> <br />amount of water delivered (supplied). The term .consumption. re- <br /> <br />fers to that portion of total deliveries which does not find its <br /> <br />way back to a wastewater treatment facility and thus is unava!l- <br /> <br />able for further uses. <br /> <br />, <br />~ <br /> <br />The Denver Research Institute (DRI) has formulated daily per <br /> <br />capita demand projections for the Denver Metropolitan Area. <br /> <br />These projections, shown below, ....were based on a computer <br /> <br />regression analysis of the historic demand data against time and <br /> <br />annual precipitation,. (Milliken et aI, 1975, p. VI-24). At the <br /> <br />50 percent confidence level, the projected per capita demand fig- <br /> <br />ure would probably be exceeded every other year; at the 90 per- <br /> <br />cent confidence levei, one year in 10; and at the 96 percent <br /> <br />confidence level, one year in 25. Thus the figures for the 90 <br /> <br />and 96 percent confidence levels can be said to represent demand <br /> <br />during dry years. <br />