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411 <br /> yPllf� ' ifi;9al y,, <br /> Figure 2. Current state of the diversion approximately 1,000 feet from the point of <br /> diversion. Notice the abundance of marble rubble and exposed bedrock (grey cliff forming <br /> member) with minor soil and debris. View to the west. Photo captured 180918. <br /> 2. Please describe in detail the "Rosgen Arches" and any other stabilization features <br /> to be utilized within the diversion channel. <br /> Rosgen arches, also referred to as porous weirs, will be installed every 20-40 horizontal <br /> feet with at least 5 feet of vertical capture space at each arch location (Figure 1). Porous <br /> weirs are the ideal solution routinely used in mountain environments to redirect flows and <br /> increase channel complexity through scour and sediment sorting. Water will flow over <br /> each arch into the next settling pond effectively slowing water flows (Figure 3). Each zone <br /> of capture, or settling pond, will be monitored and sediment build up will be removed as <br /> needed. <br /> Porous weirs will be constructed by installing waste marble block and rubble along the <br /> diversion trend. Additional waste marble will be used to fortify the banks of each intended <br /> settling pond along the trend. Waste marble boulders and blocks will redirect flow by <br /> concentration water between individual rocks and mindful gaps will be maintained to <br /> ensure clear passage between arches for fish and other aquatic species. Arches will be <br /> constructed to form an upstream-pointing arch, in plan view, with the lowest point located <br /> at the apex of the arch. Porous weirs will also provide time and space for suspended <br /> sediment to fall out of the water column and settle within the succession of resultant arch <br /> settling ponds. <br /> 3—CSQ TR-5 Adequacy Response <br />