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<br />DISADVANTAGES: 1) <br /> <br />Basket, subject to rust and deterioration If not coated against <br />corrosion. <br /> <br />2) Limits use of riverfront. <br /> <br />3) Basket cost high if purchased already constructed. <br /> <br />NOTES: Prefabr i cated bas {ets have been marketed I n Europe for many years; however, <br />baskets for the construction of bank protection works in the United Statl:ts have been used <br />widely only in the past 15 years. The basic element of the basket works Is the cage. The <br />cage Is a rectangular wlr'rmesh structure divided by diaphragms Into cells. The mesh is <br />generally galvanized steel wire, which is coated if it Is to be US6lj in a corrosive <br />environment. The baskets can also be of homemade variety and the total project can be <br />done over a period of time depending on the funds and rran-hours avar lable,. <br /> <br />COSTS: Assuming 1-1/2 cubic yards at $47/cublc yard, the cost equals $70fbank-foot. <br /> <br />MAINTENANCE REQUIREMENTS: The life of rock-fl I led wire basket protection depends on the <br />durability of the wire. Replace broken wires with galvanized or plastic coated wire. The <br />baskets occasionally are rooved during severe storms, but can often be replaced. Such <br />movement Indicates foundation failure or scour at the toe. Repair al I storm damage as <br />quickly as possible. <br /> <br />ENVIRONMENTAL ASPECT: The major advantage of rock-fl I led wire baskets Is that they can be <br />designed and placed In forms that are physically and visually compatible with the <br />surroundings. Another cdvantag6 Is that because the rock Is contained within wire <br />Inclosures, they can be placed at steep angles~ requiring disturbance of only a minImum <br />width of shoreline. Thl~ feature Is particularly beneficial where space Is limited such <br />as In urban areas, recreational developments~ and sensitive environmental areas. A third <br />advantage Is that soli an,l other debris accumulate In the openings between the rocks which <br />form the cages. Vegetation will become establ lshed in the soi I and further help them <br />blend Into the envlronme1t. Vegetation growing on the baskets provides some wildlife <br />habitat, and where they Etxtend underwater the rocks provide attachment sites for benthic <br />organisms. These benthic organisms In turn provide food for fish. <br /> <br />22 <br />