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Item 6H PresentationItem 6H Amendments to Ordinance No. 480 to add regulations for streamway buffer and permeable pavement (Ord. 480 -VVVV) Sustainability Plan •Adopted in 2014 (Ord. No. 1104) •Part of City’s Comprehensive Plan, Southlake 2030. •Contains prioritized recommendations to maximize efficient use of public resources. Background Citizens Survey Strategy Map Southlake 2030 Plan 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. •Permeable pavers may be approved on a case by case basis. •Soil infiltration of 0.5 in/hr or greater is required, per iSWM specifications. Proposed Amendment to Ord. No. 480 •REQUIRED OPTION: 20% of all off- street parking areas required to be permeable on sites or developments that are larger than 1 acre. •Permeable pavers may be approved on a case by case basis. •Ordinance may be revisited in the future to consider adjusting percentage. Proposed Amendment to Ord. No. 480 •HYBRID OPTION: 20% of all off- street parking areas required to be permeable on sites or developments that are larger than 1 acre. •Any use of permeable pavement above base required amount qualifies for incentive. •Added requirement to use matching materials for use of permeable and conventional pavement Benefits of Permeable Pavement: •Reduces stormwater runoff and “first flush” pollution; •Allows rainfall to percolate into soil rather than sheet flowing into waterways; Source: Sustainability Master Plan, pg. 18 •Reduces surface temperatures by absorbing more heat than impervious paving; •Reduces pooling of water during rain events Permeable vs. Conventional Surfaces Surface Cost Per Sq Ft Installed* Conventional Concrete $1.44 to $10.06 Permeable Concrete $2.00 to $14.00 (28-30% higher for permeable) Conventional Asphalt $0.46 to $7.40 Permeable Asphalt $0.50 to $8.11 (9-10% higher for permeable) Permeable Pavers $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. Permeable vs. Conventional Surfaces Surface Cost Per Sq Ft Installed* Conventional Concrete $1.44 to $10.06 Permeable Concrete $2.00 to $14.00 (28-30% higher for permeable) Conventional Asphalt $0.46 to $7.40 Permeable Asphalt $0.50 to $8.11 (9-10% higher for permeable) Permeable Pavers $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. •Consider incentivizing or requiring use of pervious pavement Amendment Details – Permeable Pavement Sustainability Master Plan Proposed Amendment to Ord. No. 480 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 nonstructural stormwater filtering and infiltration zones; •Keeps structures out of the floodplain and provides a right-of-way for large flood events; Benefits of Creek Buffer •Helps to preserve riparian ecosystems and habitats. (From iSWM Technical Manual, rev. 9/14) Sustainability Master Plan – Water Resources “(S)imply providing a buffer area adjacent to streams, creeks, and floodplains can protect water quality by allowing the ecosystem to naturally collect and treat pollutants in runoff before they reach surface waters. Buffer areas can also reduce erosion, preserve habitat, increase open space, and reduce flooding.” - Pg. 18 Sustainability Master Plan – Goals and Objectives Sustainability Master Plan – Built and Natural Environment Pg. 39 Sustainability Master Plan Water Resources Recommendations iSWM •The adopted Integrated Stormwater Management (iSWM) Manual assists cities in meeting TCEQ stormwater requirements, in part by preserving certain natural site features conducive to abatement. iSWM •Preservation and conservation of existing stream and riparian areas within a site listed as “Integrated Site Design Practice”s in the iSWM Technical Manual. Sustainability Master Plan Water Resources Recommendations Typical Creek Buffer Profile (From iSWM Technical Manual, rev. 9/14) 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 STREAM ON PROPERTY BOUNDARY Saving trees in buffer could allow for reduction in tree planting requirements. Off-street parking Building STREAM INTERIOR TO SITE Width and planting credit allowed for bufferyards parallel to stream corridor •Section 4 and Section 34 do not agree on number of garage sales allowed Amendment Details – Garage Sales •Section 4 and Section 34 do not agree on number of garage sales allowed Amendment Details – Garage Sales Option 1 – Amend Section 4 GARAGE SALES – Occasional sales (garage sales and patio sales only) at retail, not to exceed two (2) three (3) in number on the same premises in any one calendar year, by a person who does not hold himself out as engaging in, or does not habitually engage in, the business of selling such property at retail; provided that (1) the sale shall be confined to the garage and/or patio of the premises; (2) no new merchandise acquired solely for the purpose of resale on the premises shall be sold at such occasional sale; (3) the duration of each such sale shall not exceed three (3) consecutive calendar days; (4) a permit shall be secured at least 72 hours prior to and shall be prominently posted on such premises during such sale; (5) the permit fee amount shall be as established by the City Council; (6) only one sign shall be permitted, not to exceed two (2) square feet in area, upon the premises where and when the sale is taking place. All other signs relating to the sale, either on or off the premises, shall meet the requirements of all sign regulations adopted by the City. Option 2 - Amend Section 34 ACCESSORY USE District Where Permitted aa. Yard or garage sales, subject to the following requirements: 1)No more than 3 2 garage sales within any 12 month period may occur. 2)The duration of the sale shall not exceed 72 hours. (As amended by Ord. No. 480-UUUU) AG, RE-5, RE-7, RCS, SF-1A, SF- 1B, SF-2, SF-20A, SF-20B, SF-30, MF-1, MF-2, TZD*, EC* Proposed Amendment to Section 45 to add “RE-5” and “RE-7” in place of former “RE” district SPECIFIC USE PERMIT District Where Permitted 43. Accessory buildings located in the front yard. SF-1A, SF-1B and RE, RE-5 and RE-7 PLOT PLAN REQUIRED 50. Electric vehicle charging space(s) •Level 1, Level 2, or Level 3/Rapid Charge for commercial or public use. Subject to the requirements set forth in Section 45.20 of this ordinance. All except AG, RE RE-5, RE-7, RCS, SF-1A, SF-1B, SF- 2, SF-20A, SF-20B, SF-30, MH, MF-1 PZ Action August 18, 2016; Voted 4-0 to recommend approval, noting that both options for the paving will go to Council, further noting P&Z's recommendation with respect to the number of garage sales allowed within section 4, Definitions and section 34, Accessory Uses be two allowed per year and not three, and approving the final component of the amendment. CC 1st Reading October 4, 2016; Approved 4-0, noting that the recommendation of mandatory versus incentivized use of permeable material, Council is not making a recommendation rather is directing staff to provide options and clarity at 2nd reading as it relates to no requirement with incentives, a requirement plus incentives and any new options to address concerns regarding the feasibility of implementing the process. Also noting that in terms of garage sales, Council is allowing a maximum of two (2) per year per address and specifically noting that all other changes proposed in this ordinance are approved at 1st reading. Also noting that related to the creek setback regulations that it will be the greater of 25 feet or 50 from the centerline of the creek. Questions?