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Johnston hears water-capacity options and enacts enforcement for conservation under CIWW stages
Summary
Staff presented CIWW capacity projections and recommended buying capacity to maintain a high confidence level; council also received an update that CIWW enacted stage 3 mandatory irrigation restrictions due to high nitrate levels and capacity strain, and Johnston staff began enforcement.
City staff and an engineering consultant updated the council on Johnston’s water-use history, near-term supply options and the conservation response after Central Iowa Water Works (CIWW) moved through staged restrictions this month.
Staff reported Johnston’s current contractual supply of about 6.69 million gallons per day and noted the city previously purchased 0.63 million gallons of capacity in the Sailorville (Grimes) expansion. Consultant Nathan Whipple (Foth) presented demand projections and confidence bands based on historical max-day versus average-day peaking factors. That analysis shows a range of future needs and two key CIWW expansion opportunities: the Grimes…
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