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Item 15 - Ord. 480-VVVV PresentationITY C1F SOUTHLP Amendments to Ordinance No. 480 to add regulations for streamway buffer and aermeable aavement (Ord. No. 480-VVVV Sustainability Plan • Adopted in 2015 (Ord. No. 1104) • Contains recommendations to integrate economic and environmentally sustainable practices into City policies, procedures and operations. w�v un2030 City of Southlake Sustainability Master Plan An Element of the Southloke 2030 Comprehensive Plan Adopted by5a'—N City—.111 Ordlnanre Na. llM Febeuary ]], ]g]5 P"pnred by Phoning&O mi'pm—Serv—obP—"t Ado X® E Strategic Link Citizens Survey Strategy Map 47 City of Southlake Strategy Map Southlake 2030 Plan IE 203 Amendment Details - Creek Buffer • A Tier 1 recommendation of the 2015 Sustainability Master Plan is the implementation of a stream/creek/ floodplain buffer. • The intention of the buffer is to reduce erosion, preserve habitat, increase open space, and minimize impacts from site development and increases in impervious coverage. Benefits of Creek Buffer • Can be used as 0 nonstructural stormwater filtering and infiltration zones; Keeps structures out of the floodplain and provides a right-of-way for large fl( events; Benefits of Creek Buffer Helps to preserve ripariai ecosystems and habitats Sustainability Master Plan - Goals and Objectives Goa! T Sustainabrfit�r Encourage the conservation, protection, enhancement and proper rnonagemerrt of the natural and built environment. Objective 7.I Maintain and implement policies to reduce the use of nonrenewable resources, such as energy in the neating, cooling, and operation and maintenance of city facilities. Objective 7.2 Promote public awareness and education on such sustainability issues as public health, energy and water conservation and overall environmental stewardship. Ob,'ective 1,3 Promote sustainable public and private development practices and patterns, building design,, water -use reduction and waste reduction while maintainine the existIne character of tree Objective 7A Protect surface, storm~, and groundwater quality from septic discharge, impervious surface runoff, improper waste disposal and other potential contaminant sources. Objective T5 Conserve, restore and promote tree and plant cover that is native or adaptive to the City and region while also protecting existing significant vegetation and maintaining the existing character of the City. No Num Sustainability Master Plan Water Resources Recommendations Recommendation / Policy Consider the development of a stream/ creek/ floodplain buffer area ordinance in order to reduce erosion, preserve habitat, increase neighborhood open space, create unique neighborhoods and minimize impacts to citizen safety and property. Implementation Metric Update the environmental resource protection map of the existing streams/creeks and research reasonable buffer areas in order to preserve and protect these areas. Amend the zoning/subdivision ordinance to implement the buffer area. Strategic Link Quality Development; C1, C3 Vision, Goals & Objectives Tie 7.4 Department Responsible PD5 Priority Tier Sustainability Master Plan — Water Resources iply providing a buffer area adjacent to is, creeks, and floodplains can protect quality by allowing the ecosystem to illy collect and treat pollutants in runoff , they reach surface waters. Buffer areas ilso reduce erosion, preserve habitat, se open space, and reduce flooding." - Pg. 18 No. WR3 Sustainability Master Plan Water Resources Recommendations Recommendation / Policy Implement iSWM (Integrated stormwater Management - NCTCOG) site development controls. Implementation Metric Adopt a variety of site development controls that were adopted as part of the iSWM program intended to treat stormwater runoff and/or mitigate the effects of increased stormwater runoff peak rate, volume, and velocity due to urbanization. Amend the Zoning Ordinance / Subdivision Ordinance accordingly. Vision, Strategic Link Goals & Objectives Tie Quality Development, L4, 1.11 Infrastructure; B5, C3 Department Responsible PW, PDS Priority Tier 2 Proposed Amendment to Ord. No. 480 • Allow bufferyard credit on property boundary containing buffer or on boundaries parallel to the buffer • Allow 1 for 1 tree credit for saving native trees within the buffer • Area measured 25ft from top of bank or 50ft from the creek centerline • No disturbance within stream buffer except for uses allowed in bufferyards Width and planting reduction allowed for bufferyards parallel to stream corridor I_ 000 Off-street parking Building C� Saving trees in buffer would allow for reduction in tree planting requirements. nTaMMMeMIM Conventional Asphalt P61-1351:11FE!,Porous Asphalt F Asphalt (close-urq WR4 Sustainability Master Plan Recommendation / Policy Explore opportunities to allow for pervious paving/open grid paving. Implementation Metric I Strategic Link There may be opportunities to allow for pervious paving/open grid paving for Duality larger developments with Development, substantial parking. Consider Infrastructure; modifying City policies to C3 require pervious paving when parking areas exceed a certain size. Vision, Goals & Objectives Tie Department Responsible PDS Priority Tier 2 x Benefits of Permeable Pavement: • Reduces stormwater runoff and "first flush" pollution; • Allows rainfall to percolate into soil rather than sheet flowing into waterways; • Reduces surface temperatures by absorbing more heat than impervious paving; • Reduces pooling of water during rain events Source- Sustainability Master Plan, pg. 18 Permeable Pavers at DPS North Permeable vs. Conventional Surfaces Surface Cost Per Sq Ft Installed* $1.44 to $10.06 Conventional Concrete Permeable Concrete $2.00 to $14.00 (28-30% higher for permeable) Conventional4. to $7.40 Permeable(9-10% higher for permeable) - -. • - - $5.00 to $17.86 (45-70% higher than std concrete) * Installed costs accounts for associated drainage structures and base aggregate costs, but does not account for maintenance or any land value factors. • • Proposed Amendment to Ord. No. 480 INCENTIVIZED OPTION: Permeable Concrete and Asphalt may be used to offset stormwater utility fees. Definition added for permeable pavement. L • fir' • �,�,; ,, ti - Y pv - - Y • r ^ rL • Permeable pavers may be approved on a case by case basis. • Soil infiltration of 0.5 in/hr or greater required. Proposed Amendment to Ord. No. 480 • REQUIRED OPTION: 20% of off- street parking required to be permeable on sites or developments larger than 1 acre. a -. ., ••9 0.�•,ti ._,. �- ,�. .7� -• � •., ,• •' fir. • �- a: . ,. Y - .fa 1- 7 `41111W - �01 - — r L I • Permeable pavers may be approved on a case by case basis. • Ordinance may be revisited in the future to consider adjusting percentage. Anticipated Schedule • July 26th —SPIN Meeting • August 18th —Planning and Zoning Commission • September 6th —Council 1st Reading • September 20th— Council 2ndReading CITY OF SOUTH AKE