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<br />PURGATOIRE (PICKET WIRE) RIVER, COLO.
<br />
<br />27
<br />
<br />10,' appendix A,and profiles are shown on map No, 11,' appendixA.
<br />Structural details are shown on map No. 12,' appendix A. The engi,
<br />neering features are given in table No.9.
<br />
<br />T..ABLE .N o. 9.-Engineering feat-ur.e.s .oj T.eCQmmended channel improvement at
<br />. . . Trinidad, Colo. .
<br />Drainage .area above inlet, square niilesw_ _ ___
<br />Type of channeLh______~___h______h__h
<br />
<br />742.
<br />Unpaved rectangular section w~th
<br />reinforced concrete cantilever
<br />walls and riprapped back-up
<br />levees. Unpaved trapezoidal
<br />sections with riprapp'ed side
<br />slopes both upstream and
<br />downstream from rectangular
<br />section. Riprap protected,lev.
<br />ees above and below the im.
<br />proved' channel. . Mass con-
<br />crete 'control ,weirs at critical
<br />scour points' throughout im-
<br />proved channel.
<br />1.31.
<br />1.05.
<br />
<br />Over-all length of improvOlJlent, miles___ _ _ _ _ __
<br />Over-all length of improved channel, miles~ _ _ __
<br />Rect"angular section:
<br />Length (including transitions), feet______ 8,150.
<br />Width, feek ____,----'-----:------------- 150.
<br />Depth, feet (variable)____,___________,_ 16.0 to 27.0.
<br />Height. of cantilever wall above top of "
<br />footing, feet (variable)"________,_,_,_ 16.6 to 25.8.
<br />
<br />UpstI~~~tta&~~~~~~~ ~:~~i~~~ _ _ ____ __ _,- _ _ _ __
<br />
<br />Width at toe of slopes, fect____________~
<br />Average dopth, feet________________.:.___
<br />..Downstream trapewidal section:
<br />Length, fee~_ _ _ ___ ____________________
<br />Width at toe of slopes, .feet________'-____
<br />Depth, feet___________________________
<br />.Upstream drop structure (above Animas Street
<br />Bridge) :
<br />Elevation of crest, feet above mean sea
<br />
<br />level______ _____ ___~_____ ___________ 6,991.0.
<br />Elevation of toe apron, feet aboV"c mean
<br />sea.leveL__ ____________:.________'____ 5,976.6.
<br />Fall, feek___________~____..'_.;.,_________ 14.6.
<br />Downstream drop structure' (above Commer-
<br />cial Stre~t Bridge):
<br />Elevation of crest, feet above mean sea
<br />,lev,e!._,_____________,__,_,________, 5,975.0.
<br />Elevation. of toe apron, feet above mean
<br />sea leveL__..,_______..________';.._______ 5,965.8.
<br />Fall, feeL___________..________....:~_____ 9.2..
<br />Elevation of entrance control weir crest, feet
<br />above mean sea leveL___..________________ 5,996.0.
<br />Elevation of outh}t control weir crest, feet
<br />above mean sea leveL____________________ 5,962.5.
<br />Length of levees outside improved channel,
<br />feet,____ ___ __,__ __ ____________ ________, 2,300,
<br />CapAcity of channol, cubic feet per second_,--_ 45,000.
<br />79. Estimate of first costs and annual charges.-The estimated cost
<br />of the recommended improvem,ent, including overhead and con-
<br />tin!\eDcios is $1,034,500. The estimated annual charges are $42,200.
<br />Estnnate details are shown in table No. 10.
<br />
<br />1,140,
<br />100.
<br />19.0.
<br />
<br />1,250.
<br />150.
<br />16.5,
<br />
<br />I 'I'hls map Is llot printed.
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