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<br />ADVANTAGES: <br /> <br />1) Can be used In a complex erosion problem area with frequent 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 />Bankllne Revetment - Assuming one cubic yard at .$23/cublc yard, the total cost wou I d <br />equate to $23/bank-foot. <br /> <br />Windrow Revetment - Assuming 1-1/4 cubic yards at $23/cubic yard, the total cost wou Id <br />equate to $29/bank-foot. <br /> <br />u\:" ~),u l_"":DROW ( "1- <br />~l ~ 1/3 -~~....._-- <br /> <br />!. ... ~"".ltl~I'IIIII'I.'."III1",",""'" C""~...""'_''':''':'''~''''~'IIJI;~_.r~.i"~,''''';,';I'''''' <br />A "I,""""";,. ~~-~~-- /~ <br />\ "","'II,,,II,'-A,. '.,'111,") ~ \ \ I i,/ / -~.::-.. <br />"""';""""-" ~ <br />' " " \ 'I / <br />\ \," ~------ ---- - / / <br />,,\ BI. ---~ <br /> <br /> <br />~~_/ <br /> <br />--~/ <br /> <br />Flow <br /> <br />----- <br /> <br /> <br />~ Stone All ---~ <br /> <br />Normal \ Normal <br />Water Surface \~'iUrface <br /> <br /> <br />TYPICAL SECTION kA ~ TYPICAL SECTION B-B <br /> <br />MAINTENANCE REQUIREMENTS: Continued monitoring and repairing of the riprap blanket <br />requ I red. <br /> <br />ENVIRONMENTAL ASPECTS: <br /> <br />Bankllne 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 protection 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 Introduction of the aquatic substrata allows tor a <br /> <br />14 <br />