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Last modified
1/29/2010 10:11:53 AM
Creation date
10/5/2006 12:11:49 AM
Metadata
Fields
Template:
Floodplain Documents
County
Jefferson
Park
Community
Buffalo Creek
Basin
South Platte
Title
Buffalo Creek Flood Mitigation Plan
Date
11/1/1996
Prepared For
Jefferson County
Floodplain - Doc Type
Flood Mitigation/Flood Warning/Watershed Restoration
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<br />Sodding is a method in which clumps of grass of herbaceous plants and soil are lifted from <br />existing beds and transplanted to the disturbed sites. Small sections or plugs can be dug and <br />lifted from wild land sites or nursery or greenhouse grown. The plugs are placed at a depth in the <br />soil which allows the aerial parts of the plant to be exposed. Large rolls of sod also can be lifted <br />and field planted on areas where surface stability is critical. Sections of sod containing reeds, <br />reed grasses, rushes, or sedges can be dug or lifted from native plant communities using large <br />diggers, front -end loaders, and backhoes. The sod or root mass is then transferred to the planting <br />site and planted. <br /> <br />Reed rolls are very good to use in the splash zone. They are constructed by combining sections <br />of sod, rhizomes, and shoots, and enclosing them within a wire net and placing all components in <br />a trench. Various herbaceous plants can be planted in this manner, but the method particularly <br />lends itself to bullrushes and reed grasses. A trench about 16 inches in width is dug into the <br />bank, wire netting is stretched across the trench; coarse gravel, sod, and reed-clumps are placed <br />in the wire net; and the wire net is then drawn around the material and then tied with wire. A <br />row of stakes or planks are placed on each side of the roll and attached to the wire for stability. <br />The whole system is then covered just enough to leave aerial stems exposed. The upper edge of <br />the roll should not be more than two inches above ground level. <br /> <br />Since the bank zone along Buffalo Creek will be exposed to considerable flooding and current <br />action, shrub-like willow, dogwood, birch and alder transplants or one-year-old rooted cuttings <br />are effectively used in this zone. These transplants or cuttings should be planted one to two feet <br />apart and in rows. Newly planted banks are usually subject to additional erosion and the shrub <br />plantings should have mulch placed over them to serve as temporary protection, or held firmly to <br />the bank using a long term natural/synthetic erosion control mat. Erosion control mats should <br />have the proven performance to withstand flows of 6-8 ft/second for 48 hours duration. <br />Branches of woody plants make good mulch and should be the heaviest on outside curves of the <br />stream where the current strikes the bank. The mulch should be tied down with chicken wire or <br />wire laced between stakes since the mulch may float away when flooded. <br /> <br />Where severe erosion is expected, as is the case along Buffalo Creek, the bank zone should be <br />further protected using a combination of supportive measures. Supportive measures that have <br />been used successfully include willow barriers, fascines, wattles, and stone paving with willow <br />slips among the stones. <br /> <br />Willow barriers or mats are interlaced willow switches 5 to 6 feet long that are placed <br />perpendicular to the bank. The switches are cut from live willow plants and kept moist until <br />planting. The willow switches will sprout after planting, but care must be taken to obtain the <br />switches early in the growing season before the mother stock has started to grow extensively, or <br />in the fall following leaf defoliation. Willow switches are held together and in place by wire or <br />by willow hurdling (willow branches used as a strapping) fastened to stakes. Willow switches <br />are placed in a 6 inch deep excavation and are lightly covered with earth so that the branches are <br />set in each, but not completely covered. <br /> <br />31 <br />
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