Agenda - Public Works Committee - 10/19/2021

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Table 1-3.2040 Average and Maximum Day Demands by Community. Cit Avg Day' 2040 Max Day2 2040 Peak % Total Study Area y J1 Demand (MGD) Demand (MGD) Ratio3 Avg Day Demand LRogers 2.5 6.2 2.5 32% Fkamsey 3.5 10.3 2.9 45% JDayton 0.7 1.9 2.7 9% Corcoran 1.1 3.4 3.1 14% Total 7.8 21.8 2.8 1 Average day demand is defined as the total annual water use for a system divided by 365 days,thus the annual average demand. 2 Maximum day demand is defined as the largest daily water use over the course of a calendar year. This is an important criterion for the sizing of infrastructure systems for reliable service. 3 Peak Ratio is the maximum day demand divided by the average day demand. 1.5 Existing Water Infrastructure There are 17 municipal wells listed within the study area. All of these wells draw from the Tunnel City- Wonewoc (TCW) aquifer. The sum appropriation for these wells is 1,635 MGY. Table 1-4 provides a summary of well information, along with storage capacity and distribution system interconnects for each community. Well locations and other water infrastructure are shown in Figure 1-2. Table 1-4.Northwest Metro Municipal Wells and Supply System Features No. of Total Firm Storage Wells Capacity (MG) City Aquifers CapacityL Interconnects (MGD) i Rogers 7 ir TCW El 7.8 6.3 *1 3.15 'r Dayton Ramsey 8 TCW 11 9 4 Anoka '09 Rogers, Dayton 2 TCW 2.1 0 0.5 Champlin, Maple Grove Corcoran 0 - - - - Maple Grove, C , Medina TCW=Tunnel City Wonewoc Pressure zones across the communities range from a low of 1030 in Ramsey to a high of 1170 in a small high pressure zone in Rogers. New pressure zones are anticipated in the southern portion of Dayton and the City of Corcoran which are not currently served by those cities. Portions of Dayton and Corcoran are currently served by Maple Grove. 1.6 Community Development and System Capacity The communities in this study represent different stages of development, as summarized in Figure 1-3. Using maximum day demand as an equivalent to drinking water system capacity, the capacity requirements of the communities can be compared. Rogers and Ramsey currently have community drinking water systems serving large portions of their population. It is estimated that the existing maximum day demand (based on 2015 data)for Rogers and Ramsey is approximately 25% of their projected ultimate demand. Dayton and Corcoran represent less developed communities. Dayton has a community water supply system serving a small portion of the city and Corcoran has none. Both currently purchase drinking water from Maple Grove. The existing maximum day demand for Dayton is estimated to be only 2% of the ultimate maximum day demand, and for Corcoran it is less than 0.2%. Another way to look at it: the capacity of a regional drinking water system in operation today (based on 2015 data) would be based on Rogers and Ramsey at 95% of the capacity. In 2040, this decreases to 75%, and to less than 45% for buildout conditions represented by an ultimate study area demand. Page—4 1 METROPOLITAN COUNCIL