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I I I I I I I I I I I I I I I I I I I CHAPTER IV: WATER 1.0 WATER REQUIREMENTS 1.1 General Over the past decade the Ci ty has experi enced an erratic growth pattern. Wi th the vast resources of coal, oil shale and oil in the region, the City is subject to state, national, and international changes in the energy markets. This energy-based economy can make dramatic swings, which in turn, could leave the City in a water-short situation if the rapid expansion of the early 1980's were to recur in the next decade. The City provided treated potable water to about 10,000 people in 1986. Popul ati on proj ecti ons for the year 2000 have va d ed consi derably among recent forecasters, from a high of 35,000 to a low of 15,000. Information furnished by the City of Craig indicates a 3 percent annual population growth rat~ if present trends continue. Figure IV.l shows population projections from 1985 through 2030. The estimated city popul atio~ for the year 2028 of 35,OQO people has been selected as the basis for dete~nining Craig's future water requi rements. The 35,000 popljl ati on estimate was sel ected because the installed pump capacity of the City's river diversion facilities is 12.6 million gallons per day, which can deliver water, at the maximum daily rat"!, to about 35,000 people. 1.2 Per Capita Use Rates The July, 1979 and February, 1986 reports by Norton, Underwood and Lamb, Inc. proposed water system improvements be made by the City. In those reports an average daily water use rate of 130 gallons per capita and a maximum daily use rate of 360 gallons per capita were developed. In addition, the peak hourly consumption rate was estimated as 612 gallons per capita per day. These values appeared reasonable and were adopted for this study. Estimated maximum daily demands are important for future system planning because water storage, and water treatment and di stributi on facil i ti es are - 16 -