Following the vision of the Comprehensive Plan, zoning provides the legal framework for land governance. Each zone within a zoning ordinance states design requirements that govern development. There are a number of traditional zoning requirements that can be used in adaptation efforts to sea level rise.
Zoning can shift development away from sensitive areas & preserve ecological functions of open space, limit the density of development within the floodplain, & ensure new construction is sited to minimize risk to increased sea level rise.
Norfolk is undertaking a comprehensive rewrite of the code, with the goal of creating the most resilient ordinance in the nation. The draft: shapes future development by identifying “safe growth” areas where capital improvements are prioritized; includes more efficient building process; promotes green infrastructure in vulnerable areas; strengthens tree protection & open space requirements; & requires consideration of SLR in development proposal review.
The Dillon Rule should not prohibit localities from using SLR projections to regulate flood risks - General Assembly should provide localities explicit authority to consider climate change when zoning & planning - will help avoid unnecessary lawsuits
Conditional zoning traditionally used to provide flexibility within zoning process - allows applicants to offer reasonable conditions (proffers) during rezoning process, which can help offset impacts from proposed development. However, recent legislative changes to VA proffer system have the potential to affect what actions constitute a reasonable condition to be offered.
Locality feedback: When undergoing rezoning localities could require inclusion of life cycle cost for SLR risk in part of the rezoning report submitted to City Council.
Zoning is a major tool to preserve open space. FEMA estimates the total annual economic value of green-open & riparian space: green open space = $7,853 per acre & riparian space = $37,493 per acre (FEMA Hazard Mitigation Assistance Guidance, 2015)
- Rezonings that reduce development rights = potential opposition from affected property owners
- Zoning areas are not static, but comprehensive zoning rewrites are rare. Zoning codes can often seem confusing & disorganized to those inexperienced with a locality’s specific ordinance requirements.
- While zoning ordinances affect new development & redevelopment projects, areas that are already built out are less influenced by new zoning measures.
- Stigmas of living or buying in a zone with high risk could reduce property values
Overlay districts/zones can impose additional regulatory requirements onto an existing zone for SLR adaptation. Ex: a locality can establish districts based on the VIMS adaptation strategies: protection, accommodation, or retreat. Another district could be preservation. Example conditions in overlay districts: 100 or 500-year flood zones; elevation in relation to SLR projections (requiring certain freeboard requirements); increased setbacks & buffers in coastal districts; zones that only allow for the hard armoring of critical infrastructure & otherwise require living shorelines; density requirements.
Ex: Crisfield, Maryland - elevation based land use/zoning (Mathews County had elevation based zoning in pre-2008 comprehensive plan: 0-10 feet above MSL = low development/agriculture zone)
Land higher than 3.1 ft. = suitable development
Land lower than 2 ft. = suitable for water-dependent passive recreation & resource conservation
Ex: Lancaster, VA - Waterfront Residential Overlay District covers all parcels within 800 ft. of tidal waters/wetlands & requires 100 ft. buffer from HWM and tidal wetlands, & a 50 ft. buffer from non-tidal wetlands.
Ex: Stonington, CT - Coastal Area Management Overlay District, Zoning Commission can require additional E&S measures or conservation easements within the overlay.
Ex: Illinois - Flood Prevention District Act helps finance adaptation; district can apply for funds, issue bonds, acquire property via eminent domain, etc. “The District shall direct the county to use moneys in the County Flood Prevention Occupation Tax Fund"
Setbacks establish a distance from a boundary line where building is prohibited. Coastal development is regulated by a shoreline setback, often measured from the mean low water line. Some localities impose tiered setbacks based on flood risks, erosion-rates, or elevation. Used in combination with a prohibition on hard coastal armoring, these requirements can preserve space for the SLR impact of inward migration of beaches & wetlands.
Ex: NC increased oceanfront setbacks based on long-term average annual shoreline change rates. Setback distance determined by proposed structure’s size + a setback factor of 2 (if shoreline erosion is 2 feet or less). So, structures < 5,000 sq. ft. = 60 ft setback or 30x setback factor. Structures >100,000 sq. ft. = 180 ft setback or 90 times the setback factor.
Ex. Kauai, Hi innovative shoreline setback, applicable to all land within 500 ft./ adjacent to the shoreline. Setbacks for larger parcels (lot depth > 160 ft.) are 40 ft. plus 70x or 100x the annual coastal erosion rate, based on building footprint. The annual coastal erosion rate is amended annually, creating, in practice, a rolling setback. The ordinance also prohibits shoreline armoring or dune alterations, without variances.
Ex: Ogunquit, Me increased shoreline setbacks without changing the setback itself: increased definition of normal high water from 7 ft. above MHW (annual highest tide) to 11 ft. above mean sea level, allowing for a margin of 4 ft. SLR.
Ogunquit zoning ordinance language: "In the case of land adjacent to tidal waters, the normal high water line shall be considered to be the contour line at an elevation of 11.0 feet above mean sea level as determined by a land surveyor based on the nearest USGS benchmark"
Ex: Galveston County, Tx Erosion Response Plan (2012) “may include “A building setback line that will accommodate a shoreline retreat...A prohibition on new construction seaward of the building set-back line…Criteria for voluntary acquisition of property seaward of the building setback line."
Subdivision ordinances: regulate the division of large tracts of land into individual lots - can be used to specify minimum conservation & tree planting requirements.
Ex: Charlottesville’s subdivision ordinance rewards developers with density bonuses for installing additional LID stormwater BMPs. Developer benefits: increased density & sustainable marketing. City benefits: water quality & stormwater reduction.
Cluster development: localities incentivize clustering by allowing increased densities, in exchange for open space preservation. Localities can also provide density bonuses to developers who build on the lowest-risk areas of a subdivided parcel.
Ex: Isle of Wight County sample cluster development ordinance language
Low-density zones: include agricultural, recreational, & open space uses, & allow for the construction of single-family dwellings (SFD) by conditional use permits. Caution: low-density zones reduce development intensity, but can contribute to sprawling land use patterns depending on the level of residential use permitted.
Ex: Loudoun County’s AR-2 zone has a minimum lot size of 40 acres.
1: Up to 250 points (Activity 420, Open Space Incentives (OSI), Manual pg. 420-20):
Credit for requirements or incentives to reserve floodplain portions of new development as open space.
2: Up to 25 points (Activity 420, Open Space Incentives (OSI), Manual pg. 420-20):
Credit for regulations that allow for cluster development (through a PUD or otherwise).
3: Up to 1,450 points (Activity 420, Open Space Preservation (OSP), Manual pg. 420-3):
Credit for preserving open space in the floodplain.
Code of Virginia, § 15.2-2280:
Zoning ordinances generally
Code of Virginia, § 15.2-2283:
Zoning ordinances generally; ordinances shall provide for flood protection & preserve lands of significance for environmental protection
Code of Virginia, § 15.2-2241:
Subdivision ordinance; adequate provisions for drainage & flood control
Code of Virginia § 15.2-2242.8:
Subdivision ordinances; provisions for cluster development
Code of Virginia, § 15.2-2279:
Home building regulation (setbacks, minimum lot size, etc.)
Code of Virginia, § 15.2-2286:
Incentive downzoning provisions, including voluntary agreements resulting in downzoning for tax credit ; certain localities must include standards for clustering SFD, preserving open space
Code of Virginia, § 15.2-2316.2 (C) (3):
Landowners may apply for tax abatement up to 25 years for compensation of fair market value of retired development rights.
Code of Virginia, § 58.1-339.10:
Riparian Forest Buffers Protection for Waterways Tax Credit
Va. Land Cover dataset (Va. Geographic Information Network)
Model Sea-Level Rise Overlay Zone for Maryland Local Governments (Georgetown Climate Center)
Landscape Fragmentation Tool & Estimation Tool for Impervious Surfaces (UCONN Center for Land Use Education and Research)
Citizen’s Guide to Planning and Zoning in Virginia (Chesapeake Bay Foundation)
Center for Watershed Protection (1998). Better Site Design: A Handbook for Changing Development Rules in Your Community.
FEMA. (2015). Plan Integration: Linking Local Planning Efforts
Grannis, J. (2011). Adaptation Tool Kit: Sea-Level Rise and Coastal Land Use. Georgetown Climate Center.
Grannis, J. (2012). Coastal Management in the Face of Rising Seas: Legal Strategies for Connecticut. Sea Grant Law & Policy Journal. vol. 5.1.
HRPDC. (2013). Coastal Resiliency: Adapting to Climate Change in Hampton Roads. Hampton Roads Planning District Commission.
SFRPC. (2013). Adaptation Action Areas: Policy Options for Adaptive Planning for Rising Sea Levels. South Florida Regional Planning Council.
Siders, A. (2013). Managed Coastal Retreat: A Legal Handbook on Shifting Development Away from Vulnerable Areas. Columbia Law School, Center for Climate Change Law.
VA APA. (2014). Managing Growth and Development in Virginia: A Review of the Tools Available to Localities. Virginia Chapter of the American Planning Association.