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SPECIFICATION - 391 - 5 <br />Terrace or <br />upland Inactive floodplain <br />1 on valley floor <br />Active floodplain <br />(greater than 333 <br />Teet) <br />A. Active Floodplains Greater Than 333 Feet in Width <br />/Terrace or Upland <br />upland Buffer width (zones 1 and 2) <br />equals a minimum of 45 feet <br />on either side. Calculation: <br />A150 feet x 0.30 = 45 feet <br />Buffer width (zones 1 and 2) <br />equals a minimum of 100 feet <br />on either side. Calculation: <br />Floodplaln width x 0.30 <br />Active 11 <br />(greater <br />r <br />Active feet) <br />channel <br />(showing bankfull <br />high water) <br />Buffer width (zones 1 and 2) <br />equals a minimum of 35 feet <br />on either side <br />p Upland <br /> Nate: incised f35 ?`?l 3r <br />channel banks fe <br />or <br />I <br />I <br />. <br />e. <br />l <br /> ?----? ° <br />? <br />N---? <br />h' <br />e° <br />?l <br />mthis <br />su b <br />tc <br />Active oodplain <br />150 feet e <br />e <br />t to Active channel <br />Acv channel hannel Active floodplain <br />150 feet failure during buffer (incised) or water <br />(showing bankfull <br />bli <br />h <br />t <br />t <br /> <br />high water) es <br />s <br />men <br />a <br />period body (sfi wing <br />banldull high water) <br /> <br />0. Active Floodplains Less Than 333 Feat in Width C. Incised Channel Without Floodplains <br />and All Water Bodies <br /> <br />Terrace or <br />j Buffer width (zones 1 and 2) <br />equals a minimum of 35 feet <br />upland <br />/ Inactive floodplain <br />j <br />ll <br />fl Buffer width (zones 1 and 2) <br /> on va <br />oor <br />ey equals a minimum of 60 feet <br /> / on floodplam side. Calculation: <br /> 200 feet x 0.30 = 60 feet . <br />Active floodplain <br />200 feet <br />Active channel <br />(showing bankfull <br />0. Active Floodplain On Only One Side of the Channel high water) <br />Figure 2. Examples of riparian forest buffer widths for water courses and water bodies. <br />Concentrated flow erosion or mass soil movement will be controlled in the up-gradient area <br />immediately adjacent to zone 2 prior to establishment of the riparian forest buffer. This area is <br />delineated and identified as zone 3 (see Figure 3). Zone 3 shall be designed in accordance with <br />criteria in the Filter Strip Standard (393). <br />NRCS,CO <br />AUGUST, 2006