5.4 ERMUSR 11-09-2005 - Laserfiche WebLink

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I Ile I10-19-05 Elk River Municipal Utilities I Justification of WAC Fees A typical water well & treatment plant initial construction costs are approximately I $1,250,000. At a 15 year term, 4% interest, annual payments are $108,000 or total principal and interest payments of 15 years x $108,000 = $1,621,800 I The last water tower constructed was 1.5 million gallons at an approximate cost of $1,500,000. At a 15 year term, 4 % interest, annual payments are $130,000 or total principal and interest payments of 15 years x $130,000 = $1,950,000 IAt the time of this water peak, we had 3991 meters on the system. IA typical well will produce 1,200,000 million gal. of water in 20 hours of pumping In 2005 our peak day was 5,638,000 gal. for 3991 water meters or 5,638,000/3,991 = I1413 gal. per meter. One well has enough capacity to serve approximately 1,200,000 gal/1413 gal/meter= 850 meters Water well and treatment plant cost per meter is approximately $1,621,800/850 meters = $1908/meter IIn regard to determine how many meters a water tower can support, there are many different criteria for determining and sizing water towers. The most pertinent for this I application is the total storage = average daily consumption. Elk River's average day is approximately 1,800,000 gal/3991 meters =451 gal /meter. Our last water tower of 1,500,000 gal can support 1500000/451 gal = 3326 meters. IWater tower cost per meter is approximately $1,950,000/3326 meters = $586/ meter. I If the WAC fee is to pay for the initial cost of the wells, treatment plants and water towers, and if a WAC unit is equivalent to 1 per meter, one could justify a WCA fee of $1908 + $586 = $2494/WAC unit.. Due to the residential—commercial mix, 1 meter is I approximately equivalent to 1.2 WAC units. Therefore the cost per WAC unit is more in the $2494/1.2 =$2078 range.