Admin Order 58-12-14 - Laserfiche WebLink

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An assessment of the types of facilities constructed in the past year in Eugene shows that a proportionally higher number of green infrastructure/LID 6 facilities over mechanical treatment facilities are being implemented by private development. More specifically, for the period of time from July 1, 2008 through June 30, 2009: • Of the 124 land use applications reviewed for stormwater development standards purposes, three times as many proposals incorporated green infrastructure/LID facilities, as compared to those that incorporated mechanical water quality treatment facilities (90 vs. 34, respectively). • With respect to residential building permits issued, 54 of the 55 incorporated green infrastructure /LID facilities, and one incorporated mechanical treatment. • With respect to commercial building permits issued, 35 of the 69 incorporated green infrastructure /LID facilities (including: 2 filtration planters; 6 vegetated swales; 9 grassy swale; 7 vegetated filter strips; 5 rain gardens; 2 soakage trenches; and 4 pervious pavers), and 34 incorporated mechanical treatment facilities. In summary, the City's approach to regulating stormwater management is a combination prescriptive- choice- incentive -based approach. The Stormwater Development Standards and Stormwater Management Manual prescribe the basic requirements, offer a range of choices including many green infrastructure /LID choices to suit a wide range of site - specific conditions, and incentivize the preferred choices through financial and other means. The owner /developer must meet the stormwater development standards, and is allowed to make choices in terms of stormwater facility type utilized, suitable for each individual property. The City provides outreach and training, and sets an example through its capital projects. In addition, the City is actively working to identify additional incentives and reduce or eliminate barriers to implementing LID, in accordance with City Council direction. The outcome of this approach is that the vast majority of residential developments and a slight majority of commercial /industrial developments are choosing green infrastructure /LID facilities. The City will continue to seek ways to further increase the use of these facilities. 6 Green infrastructure facilities for purposes of the City's categorization include vegetated swales, filter strips, and rain gardens, which are all pervious in nature. Soakage trenches are infiltration facilities, therefore pervious by design, but are not vegetated. Therefore, soakage trenches are considered LID facilities, but not green infrastructure as the term is commonly used. Mechanical facilities are not pervious in nature. RR -SC Stormwater Basin Plan Comments Pg.8 of 17