Agenda - Council - 12/12/2017 - Laserfiche WebLink

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development is projected to be similar to existing land use. Thus, historical water use will be utilized to project future water demands. Key concepts used developing water use projections are as follows: 1. Residential water use will be projected to be 90 gallons per capita per day (gpcd). This will represent 60% of the total water use in the system. Conservation measures have been implemented with the intent to achieve this level of water demand. 2. Commercial water use will be 35% of the total system use. This is equivalent to 53 gpcd. 3. Other water use will be approximately 4% of the total water use. Conservation measures have been implemented, including the adoption of water conservation rates and the requirement for new development to install 4-inches of MnDOT premium soil to reduce infiltration of irrigation water. This is equivalent to 6 gpcd. 4. Unaccounted water will represent 1 % of the total water use. This value is well within the range of acceptable unaccounted water use values according to the American Water Works Association. This is equivalent to 1 gpcd. 5. Total gross water use is projected to be 150 gpcd. 6. Peaking 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 decreasing over the past 9 years. A peaking factor of 3.0 would typically be utilized for long-term projections of a system of the size of Ramsey's. This peaking factor is representative of the ratio over the past 4 years, and will be utilized for future projections. Figure ES.1 provides a summary of the projected average and maximum day water usage for the planning period. C. EXISTING FACILITIES Existing facilities include water supply, treatment, storage and distribution facilities. Infrastructure needs for each of these functional categories is as follows: City of Ramsey, Minnesota — R13.104504 Page 2 Comprehensive Water System Study Prepared by Bolton & Menk, Inc.