What happens to the 35% cap on impervious coverage for residential property?
The 35% cap on impervious coverage was a surrogate for water quality controls on phosphorus. The proposed 0.41 standard has an equivalency of 14-16% impervious coverage. This means development exceeding the 0.41 pounds of phosphorus-per-acre-per-year standard must treat stormwater using Best Management Practices (e.g. rain gardens, cisterns, infiltration trenches) before it leaves the site. The 35% cap is no longer needed as a water quality performance standard. However, the city plans to add lot coverage limits in Chapter 48, Zoning under an amendment to the proposed ordinance.

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1. Why is the city changing the stormwater ordinance?
2. What are the new stormwater development criteria?
3. How does impervious cover impact volume of stormwater runoff?
4. What happens to the 35% cap on impervious coverage for residential property?
5. What does the new standard mean for single-family homeowners?
6. How does this relate to the city’s new Stormwater Utility Fee?
7. Will this solve drainage problems in my neighborhood?
8. When does this go into effect?
9. Where can I find more information about stormwater?