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CRITERIA FOR DESIRABLE STORAGE CAPACITY <br />There are many criteria, or "rules of thumb" based on past experience, <br />for determining the amount of storage necessary for the safe and smooth <br />operation of a municipal water system. Some of these are discussed here and <br />the needs of Loveland are compared with the optimum in each case. <br />It must be noted here that the assumption is made that, in all cases, <br />the treatment plant is maintained at such capacity as to be able to treat a <br />maximum day's demand and that the transmission system can deliver that quan- <br />tity of water to the reservoir units. <br />A storage tank or reservoir may be provided for any one or all of the <br />following reasons: <br />1. As an emergency supply of water in the event of disruption in <br />the operation of the main source of supply. <br />2. To handle peak loads which are above the capacity of the main <br />source of supply. <br />3. To provide water for fire protection. <br />4. To provide for a more uniform and more economical operation of <br />the main supply by drawing from storage during high demand <br />periods and by refilling during periods of low demand. <br />5. To help maintain adequate pressures in the system. <br />The storage facilities in the Loveland system are being used for all of <br />these purposes. With all plant facilities in operation, and at the design <br />loading, the draw -down from the total storage facilities will normally be <br />used only to provide adequate pressures and flows at peak demands, unless <br />an extremely heavy fire demand or a breakdown within the system coincides <br />with a maximum domestic demand, the storage tanks will never be drawn down <br />over thirty per cent. <br />- 16 - <br />