Item A: Low Impact Development: Results of Review

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Gresham’s Department of Environmental Services has developed a Green Development Practices Manual for two of its planning districts as well as Green Street Standards for local, arterial, and collector streets. Stormwater SDCs are reduced for installment of qualifying quantity and quantity best management practices. Approved on- site stormwater mitigation will also reduce monthly stormwater utility fees. Portland’sOffice of Sustainable Development oversees the city’s Green Building Program which currently provides a bonus Floor Ratio Area for buildings based on three ranges of ecoroof coverage (vegetated roof system) in relation to the building’s footprint: 10-30%, 30-60% and 60% or greater earns one, two and three square feet of additional floor area per square foot of ecoroof respectively. However it should be noted that this incentive is not being utilized since developers are able to achieve the bonus FAR without the addition of an ecoroof. Portland otherwise provides financial assistance to developers who can meet established Leadership in Energy and Environmental Design (LEED) standards. Portland’s Bureau of Environmental Services (BES) oversees a Sustainable Stormwater Management program that includes the city’s 1) Green Street Program by which the Portland City Council recently adopted a Green Street resolution to promote and incorporate the use of green street facilities in public and private development; 2) source of Ecoroof educational outreach including related seminars, case studies, local monitoring and specifications (Stormwater Management Manual); and 3) Clean River Incentive and Discount Program which provides a 35% credit towards its monthly stormwater management charge (utility fee) for registered private stormwater facilities. Stormwater SDCs may also be reduced by the reduction of on-site effective impervious surface area through incorporation of LID techniques such as use of vegetation and permeable paving. Wilsonville is updating its Stormwater Master Plan and LID principles and practices will be encouraged. Per Wilsonville’s adopted Transportation Systems Plan any alternatives to existing street design standards, for which Green Street concepts are considered viable, are approved by the Development Review Board and the City Engineer. B. Current Incentives in Eugene Several incentives are currently provided that accommodate goals of LID, including the following: Stormwater System Development Charge (SDC) Credit Impact Reduction – two forms of separate and potentially additive credits may be provided: Destination and Quantity Reduction – proportional to the reduction of runoff entering the public system from the fully developed site (detention facilities are not eligible). Must meet standards for stormwater destination as specified by EC in a manner which demonstrates ongoing reduction in impact to the public system. Pollution Reduction – Reduction of stormwater pollution through water quality treatment techniques, beyond minimum requirements, may result in a single-level water quality credit of 10% of the total (gross) stormwater SDC. Stormwater User Fee Credits Impact Reduction – two forms of separate and potentially additive credits may be provided: Destination and Quantity Reduction – credit is proportional to the reduction of runoff entering the public system from the fully developed site (detention facilities are not eligible). Must meet standards for stormwater destination as specified by EC in a manner which demonstrates ongoing reduction in impact to the public system. Pollution Reduction – Reduction of stormwater pollution through water quality treatment techniques which meet minimum requirements qualifies for an ongoing reduction of the monthly user fee equal to 10% of the impervious area portion of the charge. September, 2008 City of Eugene LID Report, Page 18 of 26