Laserfiche WebLink
<br />~~Z"- <br />:4:r,.,.'.",'"..';,".",c~.~ <br />'...1/-',':' < 1',~:~ <br />',it.. '(("~~'.'~, : ~ ,"~ <br />~-I ,'-_...._ _" . ".-j , ,. <br />~p: '~ \::~ ~>"":.-:r )'7 <br />~,~ "<- ,'...... ;~ <br />:~x... ,~_*-:;~~_::-:-.,;->~{J <br />'~'.' ~,7,> .."".",',;7 <br />-;':~..~-~~ <br /> <br />DEPARTMENT OF THE ARMY <br /> <br />ALBUQ:.JERQUE DISTRI'::T_ CORPS OF ENGINEERS <br />P 0 SOX 1580 <br />A.LBUQUERQUE, I~~W MEXICO 87103 <br /> <br />S:,,'_"\ED-P <br /> <br />'~ ..-"r 1\ ''-0 <br />' ,-. - ,/ ~I <br />I LI.JLl~_ <br /> <br />22 \Iay 1973 <br /> <br />q^'" ') jl '073 <br />1'1Ii'1.( ...... 'J.: 1:J . <br /> <br />C::;LO. ','jTiER <br /> <br />LOTry F. Lan::!: <br />~Jt8r resource Engineer IV <br />Colorado Water Conservation Board <br />1~2 Colu~bine Building, <br />1845 Sherman Str2et <br /> <br />CO::-;',)tj{\!,~~\~i:i SOi1RO <br /> <br />;:'':~:',;:...''''', C01.:j:':-~~i<) <br /> <br />'~~ -=:'...15 <br /> <br />Dear :'.!r. Lang; <br /> <br />l1eferel1ce is l'1;::cle to your letter d;::ted 5 April 1973, requesting a floodway <br />analysis for :,;onument Creek located generally bet\~'een the Kettle Creek <br />confluence and Woodman Road Bridge. <br /> <br />Data and computations for the lOO-year flood plain (existing conditions) <br />\,;;;:rc re fined !)cfore attemp~ing a computer analysis of the flood1,vay. Back- <br />lrater studies started v:ith water surface elevations established in the <br />:'!onument Creek Flood Plain Information Report at Woodman Road bridge. <br />Inclosures 1 through 5 show the updated flood plain and "ater surface <br />profiles in !core detail than published in the Report. <br /> <br />During the back\~'ater study, computations reverted to lr.inimum energy 6 times <br />(often failing to balance energ)" heads) indicating highly unstable flow <br />conditions. Results show an average floodway width of 200 feet to maintain <br />the permissible 0.5 to 1.0 foot increase in water surface elevations. <br /> <br />Several features preclude possible use of a floodway for porticns--partic- <br />ularl)" the l'1uanders--along the study reach. <br /> <br />(1) The stream is deeply entrenched with sharp oxbows. <br /> <br />(2) "Ieanders impinge on b:1.nks and ElOl' would "super elevate" at these <br />points. <br /> <br />(3) As pTcviously mentioncrl, ti18 flow is in an unstable range. High <br />yulocities antI llstar:.d int; \-tClve:-;" arc typical for this range. <br /> <br />" <br />