Laserfiche WebLink
535 Addressing looking ahead (e.g. parking lots), Mr. Freihammer noted triggers when <br />536 additional impervious surfaces are being considered (e.g. reconstructing parking <br />537 lots) and information proposed at next month's PWETC meeting to discuss those <br />538 triggers, and research from other cities and watershed districts as to how to identify <br />539 that threshold or interpret further restrictions or requirements to mitigate larger <br />540 parking surfaces. <br />541 <br />542 Further discussion included probability projections for 100 year rainfall events and <br />543 shifts from previous precipitation data as more intense rainfalls are realized; and <br />544 flexibility of this plan update to reference and incorporate those higher volumes <br />545 during that time period; identifying data now being used versus past use of "Atlas <br />546 14" data; and whether certain areas of the city needed more strict requirements for <br />547 flood areas versus those allowed more leniency where no or little flooding was <br />548 experienced. <br />549 <br />550 Additional discussion included newly -constructed stormwater retention ponds and <br />551 city -required emergency overflow spillways or larger retention ponds in those areas <br />552 already recognized as being more susceptible based on historical flooding and <br />553 current/relevant climate data (changes to #4, 5 and 6 accordingly). <br />554 <br />555 Mr. Johnson clarified that, in part of the plan, areas considered "flood prone" were <br />556 identified and language changed to add more protection for those areas, not specific <br />557 goals, but just added language within the flood portion of the plan and <br />558 corresponding maps giving more leeway for flood zones instead of using normal <br />559 standards based on lower probabilities. <br />560 <br />561 Member Wozniak noted #7 related to minimizing impervious surface, and recent <br />562 City Council approval for a residential stormwater fee for purchasing credits to <br />563 allow more impervious surface areas. <br />564 <br />565 Mr. Freihammer clarified that the intent of the fee was in lieu of mitigating efforts <br />566 on site that were not feasible; and noted this did not encourage impervious <br />567 coverage, but required sequencing and mitigate on-site if at all possible; and only <br />568 allowed if no stormwater structure was available to tie into or contaminated soils <br />569 that may be tapped into would cause more harm. <br />570 <br />571 Goal 2 - Surface Water Protection <br />572 Discussion included the City Council's adoption of a lower threshold (4,000 versus <br />573 10,000 square feet); goals for water quality as addressed by flood protection, <br />574 encouragement for rain gardens and other BMP options; identifying the purpose of <br />575 a rain gardens and underground BMP's for larger areas: all goals to reflect a broad <br />576 spectrum of goals and policies for the city. <br />577 <br />578 Chair Cihacek asked where actual code enforcement for wetland areas and zoning <br />579 regulations would be addressed in the plan language for city enforcement for <br />580 wetland use. <br />Page 13 of 20 <br />