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<br />- <br /> <br />ADVANTAGES: <br /> <br />1) Can be used In a complex er05 ion problem area with frl;lQuent bends and <br />straight runs In the stream. <br /> <br />DISADVANTAGES: 1) Moderately high Initial cost. <br /> <br />2) Frequent repairs after slump of windrow. <br /> <br />COSTS: <br /> <br />Bankl ins Revetment - Assunllng one cubic yard at $23/cubic yard, the total cost would <br />equate to S23/bank-foot. <br /> <br />Windrow Revetment - Assumilg 1-1/4 cubic yards at $23/cubic yard, the total cost would <br />equate to S29/bank-foot. <br /> <br />e ~ },; /1 WINDROW <br />:--~" ~V " / <br />--<t\?ft~t:,,~r~~M;-- /( ~2c <br />''-''\1 j<,/ ~~'1jW" 5 ~A'J <br />I~' . V", I ", c, <br />I I, >~=-- ,I, <br />A I > -"7 -- -~""'_' <br />\ ,^l, '- ~-~'~ <br />":,,,~l$:e::.-~ -'>~~ "- <br />'~ /1 ~ <br />~ s~-_.' B -, <br />. \A <br /> <br />Flow <br /> <br />'~ <br /> <br />Jurface 1011" <br />or~l ) <br />limch Fill S' <br />, Normal <br />\.- ---.! i\ Wat:": SurFace <br /> <br />, <br />, <br />, <br /> <br />Stone All <br /> <br />2~J.ffi, , <br />~ <br />\, <br />,~~urf"ce <br /> <br />Normal <br /> <br />TYPICIIL SECT, ON AA ''', <br /> <br />TYPICAL SEerlON B'B <br /> <br />MAINTENANCE REQUIREMENTS: Continued monitoring and repairing of the riprap blanket <br />required. <br /> <br />ENVIRONMENTAL ASPECTS: <br /> <br />Sankllne Revetment - This technique is used to control undercutting of an eroding <br />bankllne, and consists of protecting the lower underwater slope with sufficient materials, <br />such as rock, sandbags~ or precast blocks, to prevent further erosive undercutting of the <br />banks. The upper bank receives a lesser treatment. This protection method Is a <br />modification of rlprap prote,;tlon In that the portion of the bank underwater receives the <br />primary protection and the portion of the bank above water receives little or no <br />prOTeCTion. As in rlprap, "the IntToductlon of The aquaTic substrata al lows for a <br /> <br />14 <br />