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UNITED STATES DEPARTIfENT OF AGRICULTURE �chnical Guide <br /> Soil Conservation Service Section IV <br /> Colorado All Field Offices <br /> July 1981 <br /> STANDARDS AND SPECIFICATIONS <br /> CRITICAL AREA PLANTING (ac.) <br /> (342) <br /> Standard Elanningconsid era t-ions <br /> Definition Other conservation practices, including <br /> but not limited to diversions, land <br /> Planting vegetation, such as trees, smoothing, obstruction removal, surface <br /> shrubs, vines, grasses or forbs, and subsurface drains, and underground <br /> on highly erodible or critically outlets, maybe necessary to prepare a <br /> eroding areas (does not include tree critical area for planting. Site pre- <br /> planting mainly for wood products) . paration accomplished through the appli- <br /> cation of the above practices should <br /> Purpose result in a site meeting the following <br /> standards. <br /> To stabilize the soil, reduce damage <br /> from sediment and runoff to downstream 1. Land slopes should not exceed 50 <br /> areas , and improve wildlife habitat percent (2:1) and should be flatter <br /> and visual resources. where feasible and practicable. <br /> Conditions where practice applies 2. Soils or soil materials must have <br /> sufficient depth and potential <br /> On highly erodible or critically ero- fertility to support the type of <br /> dible or critically eroding areas. vegetation to be established. <br /> These areas usually cannot be stabil- <br /> ized by ordinary conservation treat- 3. materials such as rocks and trash <br /> ment and management and, if left that will interfere with planting <br /> untreated, can cause severe erosion must be removed. <br /> or sediment damage. Examples of <br /> applicable areas are dams, dikes, 4. Runoff water from the site or adja- <br /> mine spoil, levees, roadsides, cuts, cent areas must be controlled in a <br /> fills, surface-mined areas, and de- manner that will prevent serious <br /> nuded or gullied areas where vegeta- erosion and damage to the planting. <br /> tion is difficult to establish by <br /> usual planting methods. Spat}€-ica[ios <br /> Critical area planting should be Tops oiling <br /> applied only on sites that have the <br /> capability of supporting vegetation. In the event that the soils have insuffi- <br /> Some critical areas are so hostile to cient depth or have physical character- <br /> plant growth, because of climate, istics unsuitable for development of <br /> soils or slope, that stabilization vegetative cover , topsoil or soil material <br /> can be achieved only through struc- having the capability of supporting the <br /> tural measures. planned vegetative planting shall be <br /> brought in and spread over the deficient <br /> areas. The material must be applied <br /> uniformly in sufficient depth to support <br /> the type and quality of vegetative cover <br /> planned for the site. Source of materials <br /> must be approved by the responsible <br /> technician. <br /> TGN 0170 <br />