Low-Impact Development Code Update: UGAs PUBLIC HEARING Thurston - PowerPoint PPT Presentation

Low-Impact Development Code Update: UGAs PUBLIC HEARING Thurston County Planning Commission August 17, 2016 Allison Osterberg, Senior Planner Resource Stewardship Department

What is LID? • Ecology definition: Low-impact development (LID) is a stormwater and land use management strategy that strives to mimic pre-disturbance hydrologic processes of infiltration, filtration, storage, evaporation, and transpiration by emphasizing conservation, use of on-site natural features, site planning, and distributed stormwater management practices that are integrated into a project design. • Key LID Principles  Conserve vegetation  Reduce and disconnect impervious surfaces  Infiltrate runoff on site

LID Best Management Practices Bullet Points? Information? Photos? Rain Garden Porous Pavement Bioretention Area Thurston County http://www.co.thurston.wa.us

Why do we need to update the codes? • NPDES Municipal Stormwater Permit, reissued in 2013 • Review codes to make LID the “preferred and commonly -used approach to site development” • Should consider measures to minimize:  Impervious surfaces  Loss of native vegetation  Stormwater runoff • Deadline: December 31, 2016

How are the codes reviewed? • Interjurisdictional Work Group  Discussed codes for Lacey, Olympia, Tumwater and UGAs • City Review Process  City staff propose initial changes  Routed through City Planning Commissions and Councils • Internal County Workgroup  Multiple county departments  Reviewed recommended changes from cities • Thurston County Planning Commission • Board of Commissioners – Final Adoption

Lacey UGA – TCC 21 Changes Related to LID  Adds definitions for LID facility, LID principles, native vegetation, permeable paving, rain garden, vegetated LID facility, vegetated roofs  LID facilities are explicitly permitted within front, side, and rear yard setbacks  Landscaping requirements are removed from individual zoning chapters and consolidated in the Landscaping chapter (21.80)  Requirement that screening and landscaping use native or drought tolerant vegetation  Additional specificity on what to include in a landscape plan

Lacey UGA (TCC 21) Consistency Changes  Update lot size, yard setbacks, and coverage limits  Low-density residential 0-4  Low-density residential 3-6  Moderate density residential  High density residential  Update permitted uses  Moderate Density Residential: 6-12 units per parcel; parcels >10 acres must provide a mix of housing types with 50% multifamily  High Density Residential: 12-24 units; parcels >10 acres must provide a mix of housing types with 50% multifamily  Removes zoning street types – to consolidate into street standards

Lacey UGA (TCC 21) Consistency Changes  Update parking standards  Makes minimum required parking optional  Establishes standards for required bicycle parking  Allows discretion for parking spaces above or below the min/max  Establishes parking ratio for mixed use development  Update landscaping standards  Shifts focus on native plant materials, rather than emphasis on grass  More enforceable standards for different types of landscaping  Removes standards for open space in multifamily projects

Tumwater UGA (TCC 22) LID-related Changes  Add definitions for hardscape, impervious surface, native vegetation, permeable pavement, pervious surface  Encourage use of LID stormwater management facilities in site design  Landscape plan required to be prepared by a licensed WA landscape architect, certified nurseryman, or certified landscaper  Landscaping required to use native plants and soils whenever possible  Pervious materials allowed and preferred for surface parking  Parking: Allow a maximum of 15% compact stalls, 8 x 15 feet  Multifamily High Density Residential Zone: Sets impervious coverage of 70% (previously building coverage only)  Mixed Use Zone: Limit impervious surface coverage to 85% (previously building and parking coverage)

Tumwater UGA (TCC 22) Consistency Changes  Update parking standards  Updated intent section, more design emphasis on pedestrian use  Establishes standards for required bicycle parking  Remove credit for on-street parking  New process for allowing increases to parking  Exempt parking in structures from required limit  Revised parking space requirements for some uses (multifamily, banks, shopping centers, warehouses, medical clinics, etc  Update landscaping standards  Landscaping plan required for multifamily or manufactured homes (5+ units), or building expansions over 4,000 sq ft or 25%

Olympia UGA (TCC 23) LID-related Changes  Adds definitions  Decreases allowed max impervious surfaces  Sets limits for hard surfaces  Credit for optional clustering, 65/10  Credit for vegetated roofs (NR zone)  “Soil and vegetation plan” rather than tree plan  60% native vegetation required in landscaping  “Small space” rather than compact space  New process for increasing or decreasing allowed parking  Pervious materials allowed for all parking areas, not only overflow  Smaller aisle widths

Olympia UGA (TCC 23) Consistency Changes  Update landscaping standards  Updates screening standards for waste containers and storage  Requires landscaping plans for four or fewer multifamily units  Update parking standards  Expands credit for on-street parking for all non-residential uses  Updates bicycle parking requirements and design standards  Encourages location of surface parking at rear of building

Questions? Staff Contact Allison Osterberg osterba@co.thurston.wa.us (360) 754-3355 x7011 Project Website http://www.co.thurston.wa.us/waterresources/lid