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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />3) rocks and vegetation along the drainage channel become sparse, <br />leaving the soil subject to severe erosion. <br /> <br />Reach D - At the lower extremity of reach C, a second diversion and <br />conveyance structure is required to divert the water approximately 1000 <br />feet laterally from the "main basin" to the "lower basin" in which Juniata <br />Reservoir is located. This reach terminates atop the rim of the basin <br />which was formed by a massive slide. Slope instability requires that much <br />of reaches D and E be watertight to inhibit further slippage. <br /> <br />Reach E - Coming off the rim of the lower basin the water must be conveyed <br />down through the slide area about 1500 feet to the lower basin <br />drainageway. Average grade is 15%. <br /> <br />Reach F - Much like Reach C, the lower basin drainageway is sparsely <br />vegetated and highly erodible, following the natural drainage channel to <br />the reservoir. The drainageway flows a distance of 4000 feet at an <br />average slope of 3.25%. Special consideration must be given to the <br />crossing of the Kannah Creek Highline Ditch. <br /> <br />In essence, this diversion alternative is nothing less than a relocation of the <br />stream. As such, Alternative B could employ several different types of channel <br />construction to implement the overall objectives of the alternative. For <br />comparison purposes, a pipeline option is also presented. <br /> <br />The various conveyance options addressed herein are denoted as sub-alternatives <br /> <br /> <br />B-1 through B-4, and are briefly described below. See Figure 3-4 for typical <br /> <br /> <br />cross sections. <br /> <br />3-6 <br />