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<br />IV-4 <br /> <br />In some areas, particularly in the vicinity of Evans Avenue, it may be <br />Tlecessaryto rip the Channel bottom to allow the degradation process to <br />occur. In ~edch 4 drop structures should tie provirled between 3rd Avenue <br />and 13th Avenue to maintain dstablechannel. These drops should be <br />designed to provide riffles for aeratioTlof the water and to pass small <br />watercraft. <br /> <br /> <br />r <br />, <br />I <br /> <br />ErOSion control in Reach 8 will be accomplished using a Minimum Maintenance <br />Alignment, stabilization of banks and protection of crossings bet\\l(!en <br />bends. Erosion control measures should be implemented, whenever appro- <br />priate, when the natural channel phenomena have brought thechdnnel into <br />the desired alignments. Tn some instances, the channel may have to be <br />realigned using construction techniques. At that time the chdnnel banks <br />will be stabilized using vegetation, ripraoor acombinationofriprap with <br />vegetation. ChaMel invert degradat10n will be allowed to occur until the <br />u1timateelevation is achieved and then will be stabi1ized with rock arm Dr_ <br />ing of crossings. <br /> <br />lJEAVERDN'i. An exa;npleof dtempordrycontrol is a beaver da'1l built <br />across the South Platte River near Littleton. <br /> <br /> <br />STHEIIM BANK EROSllJ.~. An <br />eXd",~l," of the e~TrtlnQ se- <br />vere ~tre"" bank eros i on as <br />d n'~Il1t of natunl U1tCn- <br />tro:ledr'iI'crujnJrHico;. <br /> <br /> <br />MAN-MADE HYDRAULIC Cm~TROLS. <br />'i.r 0 1 1 S t Ii e J i s t t>n ~;i L 1 € u i<" <br />Company Zuni pow.:rplarlt. <br /> <br />An dXrl-OlPl e of a IIldfl-lnade hydrdl'] i~ con- <br />,11th iJOdt ull.Ite dt thp Pllhlic <;ervir:e <br />