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Committee says city-installed terrace rain gardens aren’t cost-effective; suggests private incentives
Summary
The Middleton water-resources committee concluded terrace rain gardens are not a feasible municipal solution for phosphorus removal because of high cost per pound and low per-device effectiveness, and recommended considering a private incentive program instead.
The presenter told the Middleton water-resources committee that installing terrace rain gardens citywide would be cost-prohibitive and unlikely to meet the city's TMDL phosphorus-removal goals. The presenter said the meeting figures showed a very high cost per pound of phosphorus removed — stated in the presentation as "2,500 to $31.50" per pound — compared with $50 to $60 per pound under an adaptive-management approach, and that a single terrace rain…
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