About the Team
About the Team
About the Team
About the Team
About the Team
Constraints
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Standard
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Internal drainage for bank seepage shall be provided when needed. Geotextiles or properly designed filter bedding shall be incorporated with structural measures where there is the potential for migration of material from behind the measure.
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All revetments, bulkheads, or groins are to be no higher than 3 feet (1 meter) above mean high tide, or mean high water in non-tidal areas
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Structural shoreline protective treatments shall be keyed to a depth to prevent scour during low water.
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Utilize vegetative species that are native and/or compatible with local ecosystems. Avoid introduced, invasive, noxious, or exotic species that could become nuisances. Consider species that have multiple values such as those suited for biomass, nuts, fruit, browse, nesting, aesthetics, and tolerance to locally used herbicides. Avoid species that may be alternate hosts to disease or undesirable pests. Species diversity should be considered to avoid loss of function due to species-specific pests. Species on noxious plant lists should not be used.
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Select plant materials that provide habitat requirements for desirable wildlife and pollinators. The addition of native forbs and legumes to grass mixes will increase the value of plantings for both wildlife and pollinators.
Specifications
Virginia NRCS Construction Specification 795 discusses the materials, equipment, and labor necessary for the installation of geotextiles when installed for slope protection, subsurface drains, and road stabilization. One requirement discusses the material composition, which should have “a composition of at least 95 percent, by weight, of polypropylene, polyester or polyvinylidene-chloride.” VA-795 also gives specifications for the surface preparation, which should “be reasonably smooth and free of loose rock and clods, holes, depressions, sharp objects, projections, muddy conditions, and standing or flowing water.” The specifications for placement include details depending on the purpose of the geotextile, such as for slope protection, which details that “the roll or panel length will be placed parallel to the direction of water flow unless otherwise indicated on the construction drawings.”​
Virginia NRCS Construction Specification 761 discusses excavation when it is used to achieve the grading given in construction drawings. One requirement is that, when possible, excavated materials should be used in earth fill after being inspected for suitability and should not be wasted. Another specification is that the excavated area should be stabilized to ensure workers' safety, "prevent sliding or settling" of the soil, and to "avoid damaging" the area. VA-795 also states that excavation beyond specified lines must be corrected.
Virginia NRCS Construction Specification 721 discusses construction of loose rock riprap revetments, as well as when and what materials should be placed underneath. The specifications for rock that can be used include that the rock must have a bulk specific gravity of at least 2.5 and an absorption 2 percent or less to be used. One requirement discusses fill material and how it must be approved by NRCS and compacted down to "a density equal to the adjacent existing soil material.” VA-795 also gives specifications for filter layers, which must be "spread uniformly" and be "reasonably free of mounds, dips or windrows.”