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3.7. Equivalent Meters <br />Equivalent meter units(EMUS)are used to allocate meter-related costs appropriately and equitably. Larger meters <br />have the capacity to impose larger demands on the system and are more expensive to install, maintain, and replace <br />than smaller meters. <br />EMUS are based on meter hydraulic capacity and are calculated to represent the potential demand on the water <br />system compared to a base meter size.A ratio of hydraulic capacity is calculated by dividing larger meter capacities <br />by the base meter capacity. The base meter in this Study is the 5/8" meter,which is also the most common meter <br />size. <br />Table 3-9 shows the calculation of meter capacity ratios for each meter size. The capacity in gallons per minute <br />gpm)shows the actual meter capacity of the City's AMI meters and was provided by City Staff. <br />Table 3-9: Meter Capacity Ratios <br />tic 0 <br />1 5/8 inch 20 1.0 <br />2 3/4 inch 30 1.5 <br />3 1 inch 55 2.5 <br />4 1-1/2 inch 120 5.0 <br />5 2 inch 160 8.0 <br />6 3 inch 450 17.5 <br />7 4 inch 790 31.5 <br />8 6 inch 1,400 65.0 <br />9 8 inch 3,500 140.0 <br />10 10 inch 5,500 210.0 <br />Table 3-10 shows the meter counts by customer class and meter size, derived from the customer account data <br />Table 2-5). Table 3-11 shows the derivation of equivalent meters based on the capacity ratios(Table 3-9)and the <br />meter counts(Table 3-10).The capacity ratio for each meter size is multiplied by the meter count in each class to <br />determine the equivalent meters per class. <br />WATER AND RECYCLED WATER RATE STUDY REPORT 41