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dE • 034: la1.iY Ai' yw Terraces are provided on the sideslopes of the Segment 1 and proposed for closure of the infill segment and Segment 2 to minimize the length of overland flow and reduce flow velocities. The terraces on the infill segment and Segment 2 are sloped inward toward the upper sideslopes, creating shallow ditches. The terrace ditches convey stormwater runoff to the inlet risers and down the letdown pipes. The grassed terraces must be well maintained with vigorous growing grass to retard sideslope flow and to hold the transitional edge to steeper sideslopes. The terraces should be inspected at least quarterly, or after a four -inch rainfall event and repaired as needed. Terrace mowing should be performed as needed to maintain a vigorous Pensacola bahia grass cover. Letdown Structure Inspection and Maintenance Stormwater management for the north, south, and east sideslopes closed Segment 1 is accomplished by terrace ditches on the benches located at elevation 40, 60, and 80 feet NGVD. The terrace ditches flow to two open flume letdown channels located on the northwest nd southwest corners. The top surface is drained by the closed conduit system located on the southeast corner. Eight closed conduits will be used for the closure of Segment 2. An additional two closed conduit letdown pipes will be installed, one on each of the north and south slopes of the lateral expansion area between Segment 1 and Segment 2. Section -mat -lined terrace ditches on Segment 1 flow to the open flume letdown channels. The flumes, located on the northwest and southwest corners of Segment 1 are lined with concrete filled soil mat for erosion protection. The Segment 1 flume letdown structures terminate at the bottom ditch. The bottom ditch is also lined with concrete - filled section mat and riprap for erosion protection. Cs?zS7:-ua'J k..�et t.. m{ ;: th F-37 ! L, 'tf.'.'4{•);�: �Nl��l~•fJiFi .Y TON,'�`�'.j1'F11