Agenda - Parks and Recreation Commission - 04/10/2014

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E. WATER USE PROJECTIONS Water use projections are typically made on a per capita basis for systems without a significant large water using industry. Table 2.4 presents a summary of the historical per capita water usage for Ramsey. TABLE 2.4 PER CAPITA WATER USAGE 2000 2001 2002 2003 Average Service Population 6,270 6,579 6,918 7,264 Residential GPCD 144.76 114.06 102.90 118.86 120.14 Gross GPCD 179.20 167.03 163.01 190.89 175.03 Based on this historical data, key concepts used developing water use projections are as follows: 1) Residential water use data will be projected to be 100 gpcd. This will represent 65% of the total water use in the system. Significant conservation measures will need to be implemented to achieve this level of water demand. 2) Commercial water use will be 15% of the total system use. This is equivalent to 23 gpcd. 3) Sprinkler water use will stabilize at approximately 8% of the total water use. Conservation measures will be implemented to encourage better use of sprinkler systems. This is equivalent to 12 gpcd. 4) Unaccounted water will represent 10% of the total water use. This value is within the upper range of acceptable unaccounted water use values according to the American Water Works Association. This is equivalent to 15 gpcd. 5) Total gross water use is projected to be 150 gpcd. 6) Peak day water usage is calculated using a peaking factor, which is a ratio of the expected peak day flow over average day flow. Recent history indicates that the peak day to average day ratio has been in the range of 3.6 to 4.5. A peaking factor of 3.0 would typically be utilized for long-term projections of a system of the size of Ramsey's. For planning purposes, the peaking factor will be decreased from 3.5 in 2004 to 3.0 in 2009, with a peaking factor of 3.0 used thereafter. This peaking factor assumes that in the planning period water conservation plans will moderate maximum day water usage. Appendix E contains the Water Emergency and Conservation Plan for the City of Ramsey. Table 2.5 provides a summary of the projected average and maximum day water usage. City of Ramsey, Minnesota - M21.34343 Page 2-4 Water System Study Prepared by Bolton & Menk, Inc.