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Johnston hears technical briefing on CIWW capacity, conservation actions and possible large purchases of treatment capacity
Summary
City staff and Foth engineers presented long-term water-demand projections, CIWW expansion options and immediate conservation actions after CIWW staged shortages. The council was asked whether to pursue capacity purchases (options include 630,000 gallons already bought and a recommended 700,000-gallon request at the Grimes expansion) knowing costs can run into millions per million gallons.
City staff and a consulting engineer presented an extended briefing on water use trends, regional capacity options and near-term conservation steps tied to Central Iowa Water Works (CIWW) operations.
Matt (city staff) summarized 20 years of population and water-use data, noting an approximate historical growth rate of 3.65% annually and that average-day use has risen with population while maximum-day purchases have trended down after irrigation-rate changes. He told council the city must plan capacity for peak-day demand, not just average-day consumption.
Nathan Whipple of Foth explained the demand graph and confidence bands used to plan purchases: the city currently has a contractual CIWW supply…
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