18 - Laserfiche WebLink

Table 3-6: System-Wide Peaking Factors System Peaking Factors Peaking Factor Base Max Day Max Hour I 1 Base 1.00 100% 0% 0% 100% 2 Max Day 1.40 71% 29% 0% 100% 3 Max Hour 2.50 40% 16% 44% 100% 4 Average Max Day/Max Hour 56% 22% 22% 100% Table 3-7 shows the customer class-specific peaking factors based on the maximum bi-monthly usage divided by average bi-monthly usage for each class and tier. This peaking factor is used as a proxy for the class and tier- specific Max Day peaking factors(Column B), which are based on the current tiers. The Max Hour peaking factor is calculated based on the relative factor from the system-wide peaking factors. For example, the Residential class Max Hour peaking factor(Column C, Line 1) is calculated as follows: Residential Max Day Peaking Factor[Bl]x(System-wide Max Hour peaking factor[Table 3-6,B3]/System-side Max Day peaking factor[Table 3-6,B2])=Residential Max Hour peaking factor[CI] Table 3-7: Class-Specific Peaking Factors PeakingLine Customer Clas�, Max Day Max Hour Factor Peakin,�Factor 1 Single Family Residential 1.71 3.05 2 Tier 1 1.22 2.18 3 Tier 2 1.98 3.53 4 Tier 3 2.42 4.32 5 Tier 4 2.62 4.68 6 Multi-Family Residential 1.19 2.13 7 Commercial/Industrial 1.30 2.33 8 Irrigation 1.99 3.55 9 Recycled Water Irrigation 2.17 3.87 3.6. Peak Capacity Table 3-8 shows the calculation of additional capacity required to meet Max Day and Max Hour demands. The Max Day(Column D) and Max Hour(Column G) were derived in the previous subsection (Table 3-7) for each customer class and tier. Annual use(Column B) is derived from the water usage projections(Table 2-6)based on the current tiers. Note that the total annual use for each class(Column B, Lines 1, 6-10) are equal to the total water use for each class in the projections. Annual use is then converted to average daily use(Column C), assuming 365 days in a year. The Max Day capacity in ccf per day(Column E)is calculated by multiplying the average daily use(Column C)by the Max Day peaking factors(Column D). The Max Day extra capacity in ccf per day(Column F) is equal to the Max Day capacity(Column E) less average daily use (Column C). 38 CITY OF PLEASANTON