Get Full Government Meeting Transcripts, Videos, & Alerts Forever!
Moline officials propose tighter stormwater rules, citing new rainfall data and pollution controls
Summary
City staff and consultants recommended updates to Moline’s stormwater ordinance including use of Bulletin 75 rainfall data, lowering the permit threshold from 1 acre to one-third acre, required volume control for the first inch of runoff, and velocity control to reduce downstream erosion.
City staff and consultants presented proposed revisions to Moline’s stormwater ordinance aimed at updating design standards and adding best management practices to better address changing rainfall patterns and protect the river.
The changes being recommended would adopt the Illinois State Water Survey’s Bulletin 75 rainfall data, lower the additional impervious-area threshold for Class 2 drainage permits from 1 acre to one-third acre, require design using a critical storm duration rather than a fixed 24-hour event, add a "first-inch" volume-control requirement for impervious surfaces, and require velocity-control measures so post-development runoff does not exceed pre-development velocities.
"This updated rainfall data will allow the city to better plan for the current runoff," said Scott Desplinter, a consultant with CMT, referring to…
Already have an account? Log in
Subscribe to keep reading
Unlock the rest of this article — and every article on Citizen Portal.
- Unlimited articles
- AI-powered breakdowns of topics, speakers, decisions, and budgets
- Instant alerts when your location has a new meeting
- Follow topics and more locations
- 1,000 AI Insights / month, plus AI Chat
