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<br /> <br /> <br />0 <br />0 <br />a? <br />? 0 <br />0 <br />0 0 <br />•t? <br />"" <br />?a <br />• QQ? a4 <br />° 0 <br />.?pa <br />a° ° <br />° <br />a : <br />p op 'n . <br />oo g- <br /> <br />• <br />oQQb a? .'pd , • 12 A ?a <br />aQ.?p°a0?(f ?t? °? ••? Qp?4?o o.a <br />INSTALLATION IN STORM WATER CHANNELS <br />FIGURE 0 <br />Longitudinal anchor trench at top of slope <br />• Space anchors 12 in (300 mm) along bottom of trench <br />FIGURE 0 <br />Key anchor trench at toe of slope <br />0 Figure 4 shows general installation layout and details for TRMs and NPfRMs in storm water channels. <br />? Excavate an initial anchor trench 12 in (300 mm) m1rdmurn deep and 12 in (300 mm) minimum wide across the channel at <br />downstream end of project (see Figure 5). Deeper initial anchor trench is needed in channels that have the potential for scour. <br />? Excavate longitudinal anchor trenches 12 in (300 mm) minimum deep and 6 in (150 mm) minimum wide along both sides of the <br />installation to bury edges of mat (see Figure 6). The trench shall be located 2-3 ft (600.900 mm) over crest of slope. <br />? Place roll end into the initial anchor trench and secure with anchoring devices at 12 in (300 mm) minimum Intervals <br />(see Figure 5). Position adjacent rails and secure in anchor trench in same manner. Backfill and compact soil into trench. <br />? Unroll mat in the upstream direction over the compacted trench. <br />? Continue i nstallation as described above, overlapping adjacent rolls as follows: <br />Roll edge: 6 in (150 mm) minimum with upslope mat on top. Secure with one row of ground anchoring devices on 12 in <br />(300 mm) minimum intervals (see Figure 7). <br />Roll end: 12 in (300 mm) minimum with upstream mat on top. Secure with two rows of ground anchoring devices staggered <br />12 in (300 mm) minimum apart on 12 in (300 mm) minimum intervals (see Figure B). <br />? Fold and secure mat rolls snugly into intermittent check slots. Lay mat in the bottom and fold beck against Itself. Anchor through <br />both layers of blanket or mat at 1 ft (300 mm) intervals then baddill and compact soil (Figure 9). Continue rolling upstream over <br />the compacted slot to the next check slot or terminal anchor trench. Check slots are placed at 25 to 30 ft (7.6 to 9.1 m) intervals <br />perpendicular to flow. <br />4' _.