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City of Rifle Water Conservation Plan Final Report -July 2008 Figure 2-4 presents the water balance graphically. Water demand rose an average of about 9% annually in 2006 and 2007. 2300 2200 2100 2000 ~ 1900 0 ~ 1800 m 3 1700 Q 1600 1500 1400 City of Rifle Potable System Water Balance (2003 to 2007) 2003 2004 2005 2006 2007 2008 1300 2002 WTP Raw Water WTP Finished Water ~ r ~----~ Accounted-for ~ ~~ Used Water ~ ' ~ ~~ ® rc. Sold Water ,. Figure 2-4: Potable System Water Balance (2003 to 2007) 2.5 Water Demand per Capita and per Equivalent Residential Unit Water consumption per capita and per equivalent residential unit (EQR) are common water demand metrics. They are also often used as a basis for projecting future water demands. Table 2-3 tabulates key unit water demand metrics for recent years. Variability in the per capita water use figures likely are due to a combination of inaccuracies in the water use data and population estimates. Based on a typical peak day to average day demand ratio of 2.56 and a typical average day finished water production rate of about 400 gpd/EQR, a peak day finished water production requirement of 1,024 gpd/EQR is used in the 2006 Water Master Plan to project future water infrastructure needs in the "no conservation" case. 2.6 Water Demand Forecast There is currently very significant growth pressure on the City of Rifle. The City provides significant housing opportunities for both the energy industry in western Garfield County and the local and upvalley tourism-based economies. As indicated in Table 2-3, the City has been experiencing rapid growth. City Planning Department and Utility Department staff have made conservative projections of growth over the next 20 years based on recent trends, growth likely to occur in known future developments currently in the planning process, and overall housing market/local industry forces. SGM # 99055A-388 18 Historic Water Use and Forecast Demand