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PlAN CX)N!'ENT A. Demand Analvsis 1.... Measuriha Consumotion Most larger utilities monitor their supplies an::l keep records of col1S\.Ul'P'tion an::l use. Source an::l service meters enable utilities to record col1S\.Ul'P'tion infonnation on a regular basis. While metering presents the best method of measuring col1S\.Ul'P'tion, several al~tives are available for utilities without SO\.lrce or service meters: a. If you have an "elapsed time" lI\eter on your well pump, an::l know the pumping capacity of your well at a given pressure, you can detennine how much water is consumed over a given period of time. Calculate back one year an::l detennine your total arumal col1S\.Ul'P'tion. b. If you have a storage reservoir, you can shut down the pumps an::l detemine how much consumption you have in a 24-hour period by the amount of reservoir draw-down you have in the same time period. Record the reservoir level before shutting down the pumps an::l th~ again after 24 hours. Then turn the pumps back on. This should be done once a week for two or three weeks, an::l the results averaged. It is important to remember that without sufficient water storage, you may increase the risk of not having adequate fire-flow. Therefore, it is best to perfonn this exe=ise when the risk of fire is low. These risks are the same, however, as the risks undertaken when emptying storage tanks to clean or repair them. c. A third way to estimate water col1S\.Ul'P'tion is to asStnne an average (non- peak) demand in Washington sta~ of 100-140 gallons per day per person an::l to multiply this amount by the population served within your service area. In EasteJ:n Washington, however, water col1S\.Ul'P'tion is generally much higher due to irrigation. This is the least accurate of the estimation methods listed here. Among its disadvantages is that it does not account for leaks within your system, nor does it account for large users. If using this method, you may want to identify the large users in your service area an::l to estimate their water use. Then, add this number to your residential coIlS1.lIlption estimate. You may also want to add another 10 pe=ent of this new amount for "unaccounted for" water, such as system leaks. b Water Consumotion Factors a. User Characteristics Whether metered or urnnetered, it is important to identify your customer base by type of user (i.e.; agricultural, c:omme=ial, industrial, or residential). Further breakdown of commercial an::l industrial users can also be made (i. e., car wash, laundry, paper mill, etc.). Each of these customer types requires different amounts of water. 8