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The practice of more frequent rate changes 60,000 gallons per year requires treatment <br /> is in line with the advice of financial of approximately 83,000 gallons of <br /> planners, who believe it is generally prudent wastewater per year,which is the estimated <br /> to project sewerage rates for several years in flow per Residential Equivalent Connection <br /> advance when determining the rate for a (REC). The factors include adjustments for <br /> single year. Forecasting spending allows a seasonal variation, water meter variation <br /> community to forecast revenue needs, to and inflow and infiltration into the system. <br /> even out rate increases and to avoid a A formula incorporating these effects was <br /> sizeable increase in a single year. Special developed by MCES's engineering staff: <br /> local circumstances, such as a rebate from <br /> MCES or a fund surplus, may make it <br /> possible to keep rates level for a period of Water sold/(x)(y)(z)=sewage flow <br /> time. x 0.94(adjustment for seasonal variation) <br /> y= 0.875(adjustment for variation in water <br /> How Community Residential metering) <br /> Rates were Compared for this z= 0.88(adjustment for Ill into the system) <br /> Study <br /> Local Comparisons <br /> To compare rates across communities in the <br /> Twin Cities metropolitan area, MCES <br /> requested information from their customer <br /> communities. These communities sent <br /> MCES their sewer ordinances, or their <br /> sewer service charge schedules. <br /> For the volume-based charges, the estimated <br /> average annual sewerage rate is based on <br /> 5,000 gallons per month or 60,000 gallons <br /> per year of metered water volume. Because <br /> of several factors, metered water use of <br /> • <br /> 10 Study of 1998 Sewerage Rates <br />