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City discusses infill rules and on-lot stormwater controls after teardown–rebuild trends
Summary
Staff showed tear-down/rebuild data for Meadowlake and proposed a tiered infill/stormwater permit to require on-lot measures (rain gardens, infiltration trenches, maintenance agreements) for substantial rebuilds to reduce downstream flooding and impervious-area impacts; thresholds and enforcement approaches were discussed.
City staff presented data on teardown–rebuild trends in neighborhoods such as Meadowlake and introduced a proposed infill/stormwater regulation aimed at reducing runoff and protecting downstream neighbors.
Staff said many rebuilt homes approach maximum building-coverage limits but can still provide substantial green space. To address increased impervious area and downstream impacts, staff proposed an infill permit triggered by thresholds tied to substantial rebuilds (Tier 1 starts above an 800-square-foot substantial-rebuild threshold, with higher tiers requiring additional engineering). “We’re gonna require them to do stuff like, maybe a rain garden, maybe, modified, infiltration, French drains, other methods to help control that stormwater,” staff said.
The proposal would require maintenance agreements recorded against properties and allow the city to track infill permits through GIS; staff said voluntary annual inspection submissions may be used initially and the city would balance enforcement with minimizing burden. If property owners fail to maintain required stormwater measures, staff said the matter could move to notice-of-violation procedures and potential fines under the stormwater ordinance, and downstream neighbors retain private legal remedies.
Commissioners and residents raised visual and privacy concerns (views of tall rebuilt houses, driveway expansion and proximity to neighbors) as well as practical questions about long-term maintenance and inspection. Staff said proposed tiers are modeled on comparable Metro requirements but adapted to local conditions and that the measure will be brought back for formal adoption at a near-term meeting (tentatively in June).
