Hard armoring has been the traditional approach to shoreline protection. This includes the construction of bulkheads, seawalls, revetments, dikes, tide-gates, & groins, among others. Areas with considerable development & critical infrastructure may require hard armoring.
Hard armoring can protect valuable development & critical infrastructure from coastal flooding & erosion. These practices can allow for continued use of a developed area, even as sea levels rise. However, armored shorelines have a number of potential drawbacks to consider. As such, localities should carefully consider where to implement hard armoring.
In its 2015 Floodplain Management and Repetitive Loss Plan Update, Portsmouth summarizes its work in identifying & funding improvement projects. The City repaired tide gates that had maintenance issues & is preparing a cost estimate for the construction of additional floodgates.
Louisiana designates Levee Districts to maintain and operate the state’s flood and hurricane protection systems, including levees, floodwalls, pump stations, and floodgates. These districts are typically funded through property & revenue taxes.
FEMA HMA Grants: Non-localized Risk Reductions Projects are eligible for HMGP & PDM funding, including the construction or modification of dikes, levees, floodwalls, seawalls, groins, jetties & breakwaters.
Virginia Shoreline Resiliency Fund: The VSRF was created to act as a revolving loan program for shoreline protection. Although it is as of yet unfunded, the program may one day be a useful tool in living shoreline implementation.
Over 80% of Virginia’s shoreline is privately owned. Property owners have a tendency to prefer traditional hard armoring solutions, as they are well understood & neighboring properties often have existing riprap & bulkheads.
• Can provide a high degree of protection to valuable infrastructure & development
• Popular support among property owners
• Can protect large areas, making them especially useful for urban areas
• Expensive to construct, maintain & repair
• Armoring tends not to mitigate erosion, but rather shift it downstream to other vulnerable areas
• Can create a false sense of security (failure of a seawall or levee = potentially catastrophic consequences)
• May encourage further development along the coast
• Limits the upland migration of wetlands
• Virginia does not require removal of structures inundated by SLR
No construction that has the potential for encroachment on or damaging primary sand dunes or beaches can occur without review and approval by the VMRC and a local Wetland Board. A Joint Permit Application is required for the majority of development projects within tidal waters, wetlands, & coastal primary sand dunes/ beaches within Virginia. While living shorelines are technically the preferred method of shoreline management within the Commonwealth, in practice many localities approve projects using traditional hard armored structures. A stringent permitting process can prohibit implementation in instances where natural infrastructure would be more effective.
1. Up to 1,000 points (Activity 530, Flood Protection, Manual pg. 530-6):
Credit for small-scale flood control projects that protect insurable buildings. Projects must protect against at least the 25-year flood.
2. Up to 1,600 points (Activity 530, Flood Protection:
Retrofitted Buildings, Manual pg. 530-2): Credit for installation of individual property barriers, including levees, berms, & floodwalls that protect insurable buildings located in the floodplain. Barriers must protect against at least the 25-year flood.
Va. Code § 10.1-658:
The General Assembly supports & encourages measures which prevent & mitigate effects of stormwater surges and flooding
Va. Code § 15.2-970:
Localities may construct a dam, levee, seawall or other structure to prevent tidal erosion, flooding, or inundation
Va. Code § 28.2-1100:
VIMS shall engage in research and provide training & technical assistance to Board of Conservation and Recreation on erosion along tidal shorelines
Clean Water Act, Section 404, River and Harbors Act Sec. 10:
Grants ACOE authority for essentially all ground-disturbing activities in navigable waters & adjacent wetlands
Adams, S., Crowley, M., Forinash, C., & McKay, H. (2016). Regional Governance for Climate Action . Institute for Sustainable Communities.
City of Hampton. (2014). City of Hampton Tidal Floodplain Study and Protection Plan.
Grannis, J. (2011). Adaptation Tool Kit: Sea-Level Rise and Coastal Land Use. Georgetown Climate Center.
Mitchell, M., Hershner, C., Herman, J., Schatt, D., & Eggington , E. (2013). Recurrent Flooding Study For Tidewater Virginia . Virginia Institute of Marine Science.
Titus, J.G., D.E. Hudgens, C.Hershner, J.M. Kassakian, P.R. Penumalli , M. Berman, and W.H. Nuckols. 2010. “Virginia”. In James G. Titus and Daniel Hudgens (editors). The Likelihood of Shore Protection along the Atlantic Coast of the United States. Volume 1: Mid-Atlantic. Report to the U.S. Environmental Protection Agency. Washington, D.C.