Low-Impact Development Code Update Process€¦ · 8/17/2016 · Low-impact development (LID) is a...
Transcript of Low-Impact Development Code Update Process€¦ · 8/17/2016 · Low-impact development (LID) is a...
Low-Impact Development Code Update: UGAs
PUBLIC HEARINGThurston 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
Thurston Countyhttp://www.co.thurston.wa.us
LID Best Management Practices
Bullet Points?
Information?
Photos?
Rain Garden Porous Pavement Bioretention Area
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
(360) 754-3355 x7011
Project Websitehttp://www.co.thurston.wa.us/waterresources/lid