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Clive council adopts amended stormwater manual, moves to six-hour storm model and a future-conditions modifier
Summary
The council approved amendments to the post-construction stormwater management manual to adopt a six-hour temporal rainfall model and a +0.25 future-conditions modifier; staff and the homebuilders association will continue technical discussions and engineering clarifications, and the resolution passed 5-0.
The Clive City Council on Aug. 14 approved a resolution adopting amendments to the city's post-construction stormwater management manual by a vote of 5-0.
Pete, presenting for city staff, told the council the amendments contain two primary policy changes: switching to a six-hour temporal rainfall model to better reflect current Midwest storm patterns, and adding a "future conditions" modifier of 0.25 to design flows to account for larger and more intense storms expected over…
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