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STERLING WATER CONSERVATION PLAN MAY 28, 1996 Water Distribution The first pipeline to serve Sterting was made up of wood. It was installed in 1911 and took water directly from the "springdale springs" artesian well and piped it into the Town of Sterting without treatment. Domestic water is conveyed to the distribution system via four transmission mains, a 24" diameter steel pipe, a 24" diameter ductile iron pipe, a 16" diameter ductile iron pipe, and a 14" cast iron pipe. Sterting's distribution system is in average condition and has the capacity to transport enough water to meet customer needs. Today, approximately 85 miles of pipelines serve domestic water to customers. Distribution mains range in size from 4" to 24" in diameter. Materials include cast iron, ductile iron, plastic (PVC), and steel. Lines are currently being constructed by developers to serve new areas. Unaccounted-for Water The difference between total water production and water sales is referred to as unaccounted-for water. Table 9 shows the amount of unaccounted for water each year since 1988. Sterting's unaccounted-for water has averaged 24 percent of water produced since 1988. Estimates have been made for known uses of unmetered water. These uses include pari< irrigation, fire fighting, construction water, and water inain & hydrant flushing. The unknown-losses are probably due to leaks and unauthorized uses. Table 9 - Unaccounted-for Water 1.988 198.9 1990 1991 1992 1993 1994 1995 AVG Production 3.119 3,JA.6 3.056 3.128 3.TIO 3.467 4.TI5 4,342 3.4.55 Consumption 2.759 2,538 2.595 2.752 2.558 2.460 3,050 2..385 2.640 DIfference 420 708 461 376 552 987 1,065 1.95'7 816 96 Unaccoutted for \396 2296 1596 1296 1896 2896 2696 4.596 2A-96 All volues ore in ocre-feet SOUICe: Sterling Public Worl<'s Office If all of the City's facilities and customers were -metered, -system losses coutd be readily calculated with reasonable accuracy by subtracting the total of all of the metered water use from the total water delivered by the Cil). I low. fer, with some of the delivered water being to unmetered customers and since most City facilities are also not metered, there are several unknowns when estimating system losses. The besr estimate is that our system losses are approximately 15 percent of the total amount delivered. This would represent about 350 acre-feet of losses per year. The larger than nonnal unaccounted-for water amount in 1995 was due to a large water line leak in the South Platte River. Due to the fact that it was in the river bed, it was not noticed until some time later. If all customers and City facilities were metered at that time, a regular review of unaccounted-for water would have indicated the leak a lot sooner, and therefore saved a considerable amount of water and money. Page30