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~ .~ <br />x a ~ x~ -,~+~-? <br />~ m ~ p ;' <br />''t., , <br />.r <br />~ Y <br />J jd '. T 1Y;k Z~~ <br />`T ~ ~ ~. <br />~~ E ~F •1~ ~dBUY r d ~~. c~ <br />1 ~ <br />,F-,= <br />~ ., <br />r= ~~ a-t. <br />4~~~ <br /> a <br />'~. U <br />f <br />~.. i... <br />;u ~ .sue a ~4r~ ~ ~ ~ _ P_ ~t a <br />,_~ _ _ _`~ <br />;i <br />~ <br />~~ .. <br />4 <br />~ a, _ .. _Y~ -. a <br />_ ~ <br />. <br />f <br />v ~ ~ "_~ <br />~ - - s~_y _]J[.~~ ate': ,w ~.~ ~ <br />dlt _. a's _ s m _ ~~~r~ ~.. ts-4~ _ <br />~ Q v- .. <br />~ T ~:~~"ter -e._ ~~ ss. a-=~ ~_~ _ ~ ~~ ",~-~ ~ <br />~ _ ~s~ <br />._ '~ RR T. '~~ <br />a~ <br />_ - ~• .,~.- <br />fmc ~i <br />..,ire <br />_ ,'°~!~'+' <br />~ <br />~ ~~- s~1~-'sue ++-~ <br />7 bz..~ ~ .,ate-' Y <br /> <br />'~ <br />.~" `~ <br />_ <br />~„ <br />~_ <br />rp <br />"aiRi4 ~^ ~ L '. s <br />ac- 'U,~ er, <br />- ~ Tr ~ ~. <br />F• :. <br />- <br />-~kR - ~.. <br />!Y[F T~~ +.~., ..~,~~~Y~,°~` <br />``, <br />_ 3I1i1 <br /> <br /> <br />x ~~~: <br />Y ~;. <br />~" <br />~~ ~,.,. .,~ti' -- <br />.eF T~ 4 14 % <br />"~ a~ ~ n ~~ <br />LTV !' g 4... <br />~ ~ ~~ <br />s ~ ~ <br />+, <br /> <br />• <br />~ <br />F p ' ~ a <br />.. <br />".~ <br />y <br />~,, ~. <br />~+ .r 4''~ `_ 4a <br />~ ~°.4 <br />3 <br />~r ~ } ~ <br />3 rr ~~ <br />e ~+ ~ n y .. <br />`~_^x <br /> <br />2.2.7 Terrace Main Canal to Gunbarrel (Reach 3) <br />M 6 q ~d°4m~ P ~' .e <br />~~~ ~~ ~ L v <br />,i- <br />e~:'iu <br />r~ ~ ~ <br />4 ~ ~ <br />'„ ~~ <br />~~ ~~.__ <br />Below the Terrace Main Canal, the floodplain widens into the alluvial fan physiographic landform. <br />Channel aggradation and avulsion would typically occur here under natural conditions. However, <br />channel confinement and river training to accommodate the irrigation diversions have impacted the <br />river in this reach. There are four ditches in this reach that have the appropriations to divert 167.73 cfs, <br />or 22 percent of the two-year event. The channel sinuosity and slope, l.3 and 0.8%, respectively, are the <br />same as in the reach immediately upstream. <br />This reach experiences significant bank erosion as the channel attempts to adjust to the reduced flows <br />downstream of Terrace 1Vlain Canal and Valdez irrigation diversions. A pilot stabilization project was <br />built in January 2000 to determine the effectiveness of rock vanes, j-hooks, and riffles to minimize bank <br />t ~ <br />Alamosa River Watershed Restoration Master Plan and Environmental Assessment Page 2-17 <br />Figure 2-13. Photo Above Irrigation Diversion (photo by Alan Miller) <br />Figure 2-14. Photo Below Irrigation Diversion (photo by Alan Miller) <br />