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Clive staff propose technical stormwater changes to restore pre‑law runoff controls
Summary
City engineers recommended changing rainfall-distribution methods and adding a 25% climate‑adjustment to detention calculations to regain the level of runoff control Clive had before a recent state preemption law; council asked for more modeling and outreach to builders before formal adoption.
City staff and outside engineers told the Clive City Council on July 10 that a draft rewrite of the city’s post‑construction stormwater manual would adopt new calculation methods intended to comply with a recent state law while preserving local flood‑control levels.
Aaron, a water‑resources engineer with Cooler Engineering Company, told the council the update responds to SF455 and “we found by looking at a big sample of case studies … we would have seen something like 19% increase in storm water leaving those sites” if the city had not updated its methods. Staff said the draft balances two technical changes: using a temporal six‑hour rainfall distribution instead of the older SCS 24‑hour curve, and applying a 25% increase to the precipitation depth used when computing required detention…
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