A. 
Preamble.
(1) 
The Department of Environmental Protection has recognized the value of buffer zones to the protection of wetlands. 310 CMR 10.02 (2)(b) provides that any activity proposed within the buffer zone which, in the judgment of the issuing authority will alter an area protected under the Act is subject to regulation. It is generally agreed, however, that more protection is necessary for the one-hundred-foot buffer zone than is provided for in the state regulations. Since most of the proposed activities coming before the Commission occur in the buffer zone, this new section has been added to define the Commission's concerns and to set forth measures which must be taken to prevent the detrimental impacts of activities in this area on those wetland values protected by the Orleans Wetlands Protection Bylaw.
(2) 
These adverse impacts can arise from both construction and from the ultimate use of the project involved. They include, but are not limited to, erosion, siltation, loss of groundwater recharge capability, contamination of water bodies by surface runoff carrying heavy metals such as lead, cadmium, copper and zinc, hydrocarbons such as gasoline and motor oil, pesticides and herbicides, bacteria, viruses, and sediments. Nutrient loading of water bodies results from the use of lawn fertilizers as well as septic effluent. Wildlife habitat may be lost through introduction of invasive plants or otherwise and aesthetic values compromised.
[Amended 4-26-2017]
(3) 
One method of protecting environmentally sensitive areas is to provide vegetated areas or buffer zones between structures and the resource to be protected. Such buffer zones can filter or absorb many of the pollutants, encourage water recharge, prevent erosion and sedimentation, provide wildlife habitat and help to preserve the aesthetics of our natural shoreline.
(4) 
Vegetation in the entire one-hundred-foot buffer acts to prevent pollution of groundwater and surface water, functions as erosion control and wildlife habitat, and provides aesthetic improvement. Buffer zones, due to their plant community composition and structure, hydrologic regime or other characteristics that provide important food, shelter, migratory or over-wintering areas or breeding areas for wildlife are presumed to be significant to the protection of wildlife habitat. Buffers around vernal pools are especially important as the adult stages of the amphibians using the pools are generally found within 300 feet of the pool. Trees and shrubs provide important screening of buildings from public areas. Vegetation in the one-hundred-foot buffer also reduces the velocity and the nutrient content of the runoff, which protects the water body.
(5) 
Buffer zones are often compromised by existing structures, or roadways. The remaining buffer is especially important to protect the interests under the Act.
B. 
Presumption. Where a proposed activity involves the altering of a buffer zone, the Commission shall presume that such area is significant to the interests specified in the Orleans Bylaw — Chapter 160. This presumption is rebuttable upon clear and convincing evidence that the buffer zone does not play a role in the protection of said interests. No work will be permitted in the buffer zone which has a significant adverse impact upon the interests (wetland values) protected by the Act or the Orleans Bylaw. In buffer zones adjacent to an ACEC and in the Town Cove/Nauset estuary, the no adverse impact standard will apply.
C. 
Guidelines for work in the buffer zone.
(1) 
Buffer strip. Where work results in eroded or bare ground, the area must be revegetated as soon as practicable or mulched immediately. Where there is new construction or reconstruction, a buffer strip will be required landward of the resource area. It shall consist of natural indigenous vegetation and shall be a minimum of twenty-five (25) feet in width depending on factors below. The Commission may also require that a buffer strip be created where none presently exists to mitigate past buffer alterations. No work will be permitted in the buffer strip except limited vegetation removal or reduction and work necessary to maintain the buffer strip as described under elements of buffer strip.
(2) 
Between twenty-five (25) and fifty (50) feet landward of the resource area, only activities that protect or enhance the wetland interests and values protected under the Act and the Orleans Bylaw will be permitted. It is the Commission's intent to maintain a fifty-foot buffer strip. In determining the feasibility of such a width, the Commission may consider the prior use of the specific area as well as other factors such as the topography, size and configuration of the lot and the impact of a setback of the applicant's ability to obtain substantially the view sought or the desired location of the proposed structure. For new construction, in no instance should the "limit of work" area extend into the fifty-foot area. Notwithstanding the previous statements, landscaping which includes selective vegetation removal and replacement, and selective pruning, and vista cutting, may be permitted at the discretion of the Commission upon clear and convincing evidence that the wetland values noted above will be protected.
(3) 
Between fifty (50) and one hundred (100) feet landward of the resource area, alterations, including construction, will only be permitted where such work can be conditioned by the Commission to fully satisfy the required standards of protection to the wetlands interests identified in the Act and the Orleans Bylaw.
(4) 
When considering guidelines for work in the buffer zone, the site specificity and precedence provision enumerated in § 196A-3K of these regulations should be noted.
(5) 
Installation of underground utilities (gas mains, water mains, power lines, etc.) within the buffer zone are to be considered as new construction and must be conditioned as such. Any installation within the fifty-foot buffer strip of a resource area will require a variance from the regulations.
(6) 
When situating a new building or an addition within the fifty- to one-hundred-foot buffer zone, where feasible the structure should be set back at least 75 feet from the resource area to allow for passage between the building and the fifty-foot buffer and to avoid the intrusion of lawn in the fifty-foot buffer.
D. 
Buffer strip.
(1) 
Goal. The goal of the Commission is to maintain a strip of dense, vegetative cover between the development activity and the resource area to be protected, consisting of indigenous plant materials suitable for the maintenance of wildlife, both flora and fauna.
(2) 
Function. A buffer strip serves to provide wildlife habitat, improve water recharge, reduce pollution and erosion and to maintain the natural appearance of our fresh and saltwater shorelines.
(3) 
Size of buffer strip.
(a) 
Such a strip shall be a minimum of twenty-five (25) feet in width running along the resource area boundary, unless such width is unreasonable in view of the lot size, placement of an existing structure or such other factors as the Commission may consider.
(4) 
The elements of the buffer strip should reflect the indigenous vegetation suitable to the site.
(a) 
Coastal banks should be protected from run off and erosion by planting adjacent areas with at minimum low-growing salt-tolerant shrubs such as roses (Rosa virginiana, Rosa Carolina), bayberry (Myrica pensylvanica) and beach plum (Prunus maritime), and/or a border of field grasses mowed only once a year between October and March to a minimum height of 3 inches.
(b) 
Approval may be granted to maintain dense plantings at the top of a coastal bank at a three-foot height where necessary for view preservation. Fast-growing shrubs such as Rosa rugosa may be pruned to permit regrowth from the plant's base.
(c) 
Freshwater wetlands should retain their bordering native pond shore shrubs such as blueberry (Vaccinium corymbosum), swamp azalea (Rhododendron viscosum), sweet pepperbush (Clethra alnifolia), inkberry (Ilex glabra) and herbaceous plants that grow on the edge of the wetland and on to the bank; for example, blue joint grass Calamagrostis canadensis), rushes (Juncus effuses, J. canadensis) and thoroughworts (Eupatorium hyssopifolium, E. perfoliatum).
(d) 
Where new plantings are permitted in the order of conditions, use of organic fertilizers may be allowed. The use of herbicides should be limited but if needed for invasive plant control, a licensed applicator shall be utilized. Consult Barnstable County Extension Service for further details of I.P.M.
(e) 
Plantings which require heavy watering will not be permitted, particularly adjacent to coastal banks where such watering may result in runoff and erosion.
(f) 
An access path, not more than four (4) feet wide through the strip may be maintained by such mowing as is required.
(5) 
Permissible work in buffer strip. While it is the Commission's intent that no work shall occur in this strip, any work which is proposed must meet a higher performance standard than work proposed elsewhere in the buffer zone, and will generally be limited to habitat improvement or vista cutting. Vista cutting is limited to pruning, lifting and clearing as defined below. Habitat improvement is described under Subsection G, Wildlife habitat. The Commission may require that a buffer strip be created where none presently exists to mitigate past or present construction impacts.
E. 
Pruning, cutting, clearing and planting.
(1) 
Cutting, removal, or other destruction of aboveground vegetation within a resource area as defined in § 196A-2 of these regulations or within a buffer strip as defined above shall be limited. If a buffer strip is to be maintained in grasses or as a wildflower meadow, other appropriate vegetation removal may be approved.
(2) 
Identification of specific view: View clearing in the buffer zone or vista cutting and pruning in the buffer strip or resource area will not be permitted until construction is completed and a specific view identified after occupancy. Applicants are encouraged to consult with the Commission before submitting the appropriate filing and when planning projects that involve the removal or replacement of vegetation in the buffer zone, buffer strip, or resource area.
(3) 
Buffer zone and buffer strip definitions. As used in this section the following terms shall have the meanings indicated:
CUTTING
The removal of vegetation.
CLEAR CUTTING
Removal, to the ground, of all woody vegetation, including mowing of understory brush down to a minimum height of two (2) inches.
SELECTIVE CUTTING
The removal of smaller, weaker, dead and less desirable tree species, leaving the more vigorous and native trees.
VISTA CUTTING
The removal of vegetation that blocks a view.
PRUNING
The removal of branches or parts of branches on shrubs and trees.
SELECTIVE PRUNING
Removal of dead, diseased, obstructing, and weak branches or parts of branches, as well as selective thinning of branches to lessen wind resistance.
LIFTING
Lifting of the canopy by removing lower limbs from the main trunk.
(4) 
Criteria.
(a) 
Pruning. When selective pruning of trees is permitted, the removal of such branches shall be as described above for removal of dead, diseased, obstructing and weak branches as well as thinning of branches to lessen wind resistance. When pruning of shrubs is permitted, the shrubs shall retain their natural shape and features such as fruits and flowers by selecting the optimum height for the shrub and pruning different branches in alternate years. With prior approval, top of coastal bank plantings may be pruned to a minimum of 4 feet yearly.
(b) 
Cutting. When cutting of live trees for a view is proposed, the Commission will require that pruning and thinning the canopy shall be accomplished first. When cutting is the only viable option in a heavily vegetated lot the Commission may allow the removal of up to 5% of existing trees greater than or equal to (>) 6 inches of diameter at breast height, or 10% of existing trees less than or equal to (<) 6 inches of diameter at breast height in any three-year period. All trees proposed to be removed must be clearly delineated on-site. Specific specimen trees may be identified by the Commission for preservation.
(c) 
When removal of fallen or damaged trees is desirable after a storm, the Commission may allow this through either acceptance of DEP-issued emergency regulations, or through the normal administrative review filing procedure. If storm-damaged trees provide an immediate risk to the health or safety of residents, emergency removals can be authorized by the Commission or its agent.
(d) 
Dead and diseased trees may be removed if they endanger a structure or live vegetation. Flush cutting rather than uprooting will be required in some cases.
(e) 
When lifting is proposed, the health of the tree must be considered as well as the impact to wildlife. In no instance shall more than 1/3 of the above ground trunk height be pruned.
(f) 
Clear cutting of land is prohibited. The only clear cutting within jurisdiction that shall take place will be for the clearing of land for the construction of buildings with Commission approval.
(g) 
The Commission may require the replacement planting of native shrubs and trees in areas proposed for tree removal.
(h) 
When vista pruning/cutting is proposed, the Commission encourages that specific windows of view (containing top, sides and bottom and not devoid of all tree canopy species) be identified and shown on a plan. The Commission prohibits property line to property line cutting. Filtered vistas are encouraged and can be normally accomplished through pruning and lifting, although topping of trees may be permitted in specific cases. Clear cutting for a view is prohibited.
F. 
Lawns.
(1) 
Preamble. Lawn fertilization can be a major source of excess nutrients that leach into groundwater or are washed off into roads that lead to water bodies causing eutrophication, unwanted algal blooms, oxygen depletion, fish kills and foul odors. The extent of such eutrophication will depend upon the amount of nutrients added and the flushing capacity of the receiving waters. Insecticides and herbicides used to maintain lawns also contaminate our waters. Under the Orleans General Bylaw Chapter 103, the application of nitrogen and phosphorus is prohibited within 100 feet of resource areas provided it does not meet one of the allowable exemptions under the General Bylaw.
[Amended 4-26-2017]
(2) 
Requirements. Grasses with their fibrous root system tend to be excellent stabilizing plants especially on steep slopes. The same factors that affect trees and shrubs also influence the health of grasses.
(a) 
For any lawns that are to be planted within 100 feet of a resource area, a minimum of 4 to 6 inches of loam is required prior to planting. This will improve conditions for the lawn and also reduce chances of nutrient leaching through the soil.
(b) 
Only hardy species of grass that require little or no fertilizer and those that can tolerate drier conditions are allowed, such as a mixture of fescues, rye grasses, etc.
(3) 
Herbicide use.
(a) 
Because Cape Cod is such an environmentally fragile area, the Commission suggests limited use of herbicides. When they are absolutely required, the Commission recommends that professional advice be sought and that a licensed applicator must be employed if either herbicides or pesticides are used within Commission jurisdiction.
G. 
Wildlife habitat. See § 160-4 OWPB.
(1) 
Preamble. The Commission encourages the preservation of indigenous vegetation for environmental protection and also because of its important function as wildlife habitat. Plants that are sometimes regarded as trash species are often used by wildlife for important functions such as nesting, feeding and protective cover sites. For example, fox grape and other vine-like plants are used as food sources and nesting sites by both native and migratory species. Dead trees, often considered undesirable, are used as nesting and perching sites for a variety of birds and mammals, and as a food source by insect-eating birds. Dense understory in wooded areas may provide nesting sites, travel corridors and protective cover for a wide variety of fauna. In addition to its aesthetic value, wildlife also serves to maintain a natural checks and balances system within various ecological communities. A well-known example of this balance is the predation of birds acting to control the populations of various insects.
(2) 
Habitat improvement.
(a) 
Different groups of native plants make up various habitats, such as a sand plain grassland or pond shore shrub community. These native plant communities or habitats are often overrun with non-native and/or invasive species such as bittersweet, honeysuckle, bamboo, etc. Although these species may provide some cover and food for some animals, the native wildlife is dependent on the local native plant species that these are replacing. Removing non-native plants and replacing them with native species suitable for each habitat can improve the habitat. Within the fifty-foot buffer zone only native non-invasive species may be planted (with the exception of Japanese rose [Rosa rugosa] on coastal banks). Non-native non-invasive plants may be used outside the fifty-foot buffer zone, though the Commission emphasizes the advantages of using native species well adapted to Cape soils and weather conditions.
(b) 
Supporting a greater variety of wildlife is possible by increasing food sources and providing maximum protection. Both are achievable by providing a full range of plant species types for each vegetation layer: the lower level with groundcovers, grasses and wildflowers; the middle layer with shrubs and small trees; and the upper canopy with large trees. Removal of the shrub layer or lifting all the trees would eliminate food sources, reduce protection and prevent some species from nesting or denning on the site. However, the Commission encourages the removal and replacement of invasive species such as bamboo, phragmites, bush honeysuckle, autumn olive, etc. with native species if it can be shown that such removal and replacement will enhance or protect wildlife habitat.
(c) 
No landscaping or vegetation plan associated with any application to the Conservation Commission should propose the use of plant species listed on the Orleans Prohibited Plant List, which is available in the Conservation Department. Planting of invasive plants anywhere within the one-hundred-foot buffer is strictly prohibited.
(3) 
Presumption of significance:
(a) 
The Commission presumes that wildlife will be protected when sufficient open space is left in its natural state to support the indigenous populations of mammals, birds, reptiles, amphibians, and fish.
(b) 
The Commission maintains a list of plants recommended for landscaping.
H. 
Limit of work. All development activity shall be contained within the limit of work as determined by the Commission. The limit of work line as shown on the plan is, therefore, a strict limit, and any work outside this line including pruning and construction staging) will require a new filing.
I. 
Erosion control.
(1) 
Methods of erosion control: Planting of appropriate grasses, shrubs and trees and the use of buffer strips, catch basins, dry wells, diversion ditches, contour terraces, stone trenches earthen dams, grassed waterways, etc. are all recognized erosion control measures and are to be utilized in appropriate places considering specific sites.
(2) 
A fabric silt fence is the preferred method of protecting downside areas from erosion during the construction phase. This erosion control method must be shown on the submitted plan and installed on the contour in order to prevent runoff and erosion. It must be maintained intact until the disturbed area is stabilized and revegetated. Straw bales or straw wattles should only be used to support fabric silt fences in steep terrain or wherever else is deemed advisable to protect the buffer zone. The bales and or wattles must also be maintained intact and the disturbed area must be revegetated as soon as the bales are removed.
(3) 
The silt fence or straw bale/wattle barrier may also serve to delineate a portion of the limit of work on the site and may be required to confine the construction activity as well as to prevent erosion. These must also be placed on the contour.
(4) 
Revegetation/mulching requirements.
(a) 
Any activity that denudes or bares 50 square feet or more of ground surface within 100 feet of a resource area requires immediate seeding of a fast germinating grass such as annual rye grass. Native grass mixes or native groundcovers must be used within 50 feet from the edge of a resource area.
(b) 
This area must be covered with a light mulch to enhance germination and to assist in prevention of runoff.
(c) 
Construction sites must have some method of erosion control to prevent sedimentation into roadways as a result of the bare ground.
(d) 
Erosion control methods may also apply to certain areas outside the jurisdiction of the Conservation Commission. [See § 196A-2B(3).]
A. 
Preamble.
(1) 
An Area of Critical Environmental Concern (ACEC) is established under MGL c. 21A, § 2(7). Pleasant Bay and Inner Cape Cod Bay have been so designated. The landward extent of the Inner Cape Cod Bay ACEC is the ten-foot contour. The landward extent of the Pleasant Bay ACEC is the ten-foot contour plus 100 feet. The additional 100 feet beyond the ten-foot contour included with the Pleasant Bay ACEC is important in reducing anthropologic effects to the water body such as siltation from erosion caused by increased runoff from pavement and buildings or pollution from hydrocarbons or pesticides in the runoff. For the same reasons, this additional protection is also necessary for the Inner Cape Cod Bay ACEC. The natural components of both ACECs include barrier beach systems, dunes and sandy beaches, acres of salt marsh, productive shellfish habitat, large estuaries, anadromous fish runs, floodplain, and extensive areas for boating and swimming. The estuaries are habitat for upland species and waterfowl as well as a spawning and nursery ground for many marine species. The beaches, dunes and marshes protect adjacent upland from storm damage.
(2) 
Clean water must be maintained to protect the marine resources as well as the public health of recreational boaters, fishermen and swimmers. The biological productivity of these estuarine systems is sustained by the contiguous salt ponds and salt marshes that contribute large quantities of nutrients, carbon and energy to the coastal food chain. Minimum alteration of the natural features of the ACEC allows them to function at their natural capacity. These undeveloped expanses also contribute to the scenic beauty enjoyed by Orleans residents and visitors.
B. 
Performance standards.
(1) 
The standard of performance that must be met by proposed development activities in and adjacent to an ACEC is no adverse effect - 310 CMR 10.24(5). It is the responsibility of the applicant to show, using credible evidence from a competent source, that the proposed activity will have no adverse effect, either immediate or cumulative, on the ACEC resources. Additionally, there shall be a performance standard of no adverse impact within 100 feet of the ten-foot contour for the Inner Cape Cod Bay ACEC.
(2) 
Since the Nauset/Town Cove estuary shares all the same characteristics of both the Orleans ACECs, the Commission herein sets the same performance standard of no adverse impact for the Nauset/Town Cove estuary. The Nauset/Town Cove estuary will be defined as 100 feet from the ten-foot contour.
This Section 310 CMR 10.57 is incorporated subject to the changes below.
A. 
Preamble.
(1) 
State regulations at 310 CMR 10.57(3)(b)(1) read "Isolated Land Subject to Flooding is an isolated depression or a closed basin which serves as a ponding area for runoff or high groundwater which has risen above the ground surface." Section 10.57(2)(b) reads "Isolated Land Subject to Flooding is an isolated depression or closed basin without an inlet or an outlet. It is an area which at least once a year would confine standing water to a volume of at least 1/4 acre-feet and to an average depth of at least six (6) inches."
(2) 
Rationale for the change in size in these regulations (see below) is the many small flooding areas which provide filtration and recharge of runoff into the groundwater and the many kettle holes characteristic of Orleans which at times intersect the water table but which are often considerably smaller than the area protected by state regulations. Many of these kettle holes as well as our small ponds, are, or may be, connected hydrologically. With growing concerns about the quality and quantity of our water supply and the quality of our surface waters, the Commission believes a greater degree of protection for isolated land subject to flooding is appropriate until further information proves otherwise.
(3) 
Greater protection will also be provided for many small but significant areas of wildlife habitat which provide seasonal wetland habitats and essential breeding sites for certain amphibians requiring isolated areas that generally flood in the spring and/or summer. Many birds, reptiles and mammals also depend upon these wetlands as a source of food, shelter and breeding habitat. Such wildlife and its habitat also contribute to our recreational and aesthetic enjoyment.
B. 
Definition. "Isolated land subject to flooding (ILSF)" is a depression or closed basin without an inlet or outlet, which serves as a ponding area for runoff of fresh water or for high groundwater which, because of an elevated water table, has risen above the ground surface. ILSF is land which at least once a year, except during periods of drought, confines standing water to a volume which would cover no less than 650 square feet at an average depth of two inches.
C. 
Boundary. The boundary of an area of land subject to flooding shall be determined by one or more of the following, depending upon the availability of information. Where more than one method is possible, the method leading to the largest area shall be used. That boundary shall be:
(1) 
The line enclosing that area having a vegetative cover of 50% or more of freshwater species as defined in § 196A-4 of these regulations; or
(2) 
The line enclosing the largest observed or recorded area of water confined in said area; or
(3) 
The area calculated to be inundated by runoff from the one-hundred-year storm. Such calculation shall be done in accordance with 310 CMR 10.57(2)(b)(3).
D. 
Presumption. Where a project involves removing, filling, dredging or altering of land subject to flooding (both bordering and isolated areas) the Commission shall presume that such an area is significant to the following interests specified both in § 196A-1B of these regulations and 310 CMR 10.57(1)(a)(b): public and private water supply and quality, groundwater supply and quality, flood control, prevention of pollution, wildlife habitat and to the interests of aesthetics and recreation.
E. 
Performance standards. A proposed project that may result in alteration of an isolated wetland shall not result in the following:
(1) 
Flood damage due to filling which causes lateral displacement of water that would otherwise be confined to such area.
(2) 
An adverse effect on public or private water supply or groundwater supply, where such area is underlain by pervious material.
(3) 
An adverse effect on the capacity of said area to prevent pollution of the groundwater, where the area is underlain by pervious material which in turn is covered by a mat of organic peat, or muck or vegetation.
(4) 
An impairment of its capacity to provide for wildlife habitat, including seasonal wetlands (vernal pool) habitat as determined by § 196A-4 of these regulations.
A. 
Preamble.
(1) 
Land subject to coastal storm flowage, including but not limited to coastal beaches, salt marshes, banks, barrier beaches, salt ponds, dunes, land containing shellfish, land under the ocean, and banks of and land underlying fish runs, is important for the protection of public and private water supply, groundwater and groundwater quality, flood control, erosion and sedimentation control, storm damage prevention, water pollution prevention, wildlife habitat, fisheries, shellfish, and to the interests of aesthetics and recreation.
(2) 
Land subject to coastal storm flowage extends from mean low water to the calculated extent of a one-hundred-year storm. During extreme high tides and hurricanes the ability of the land to absorb floodwaters is important to buffer inland areas from flood and wave damage. The more gentle and permeable a seaward-sloping land surface is, the more effective that land surface is in reducing the height and velocity of incoming storm waves. Dredging of land subject to coastal storm flowage has the potential of allowing storm waves to break further inland and to impact other areas which might not otherwise be affected. Filling of land subject to coastal storm flowage is likely to cause displacement of flooding consequences to other areas.
(3) 
Those portions of coastal floodplains which are immediately landward of salt marshes, coastal beaches, barrier beaches, coastal dunes, or coastal banks, require special protection. As sea level rises, these areas will be inundated more frequently by storm and tide. Activities carried out within these traditional areas may interfere with the natural landward migration of the adjacent coastal resource area.
B. 
Presumption. Where a project involves removing, filling, dredging or altering land subject to coastal storm flowage, the Commission shall presume that such an area is significant to the following interests specified both in § 196A-1B of these regulations and 310 CMR 10.57 (1)(a)(b): the protection of public and private water supply, groundwater and groundwater quality, flood control, erosion and sedimentation control, storm damage prevention, water pollution prevention, wildlife habitat, fisheries, shellfish, and to the interests of aesthetics and recreation.
C. 
Performance standards. A proposed project that may result in alteration of land subject to coastal storm flowage shall not cause or create the likelihood of the following:
(1) 
Reduction in the ability of the land to absorb and contain waters.
(2) 
Reduction in the ability of the land to buffer more inland areas from flooding and wave damage.
(3) 
Displacement or diversion of floodwaters to other areas.
(4) 
Damage to other structures or property.
(5) 
Pollution of groundwater, surface water, or salt water.
(6) 
Reduction of an area's capacity to provide for wildlife.
(7) 
An increase in the elevation or velocity of floodwaters.
(8) 
Prevention of the migration of resource areas such as salt marshes due to sea level rise.