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<br />CAMP DRESSER & McKEE INC.
<br />
<br />_tal eng....... ~
<br />f'Ivn= & "'"""--' C<>">$V//an..
<br />
<br />Writer's T owor, Suile 1100
<br />, 660 South Alb;on Sueet. _. Colotodo B0222
<br />303758-4351
<br />
<br />June 4, 1980
<br />
<br />Dr.' John Liou
<br />Federal Emergency Managew~nt Agency
<br />Bldg 710, Denver Federal Center
<br />Lakewood, CO 80225
<br />
<br />Dear John:
<br />
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<br />
<br />In reference to our prel iminary Hydroloic Review for Nine.',
<br />Colorado Communities, and our discussions concerning this:c, .'
<br />sumnary, we would like to request approval of the hydrologic'
<br />analysis for the following communities:" '
<br />
<br />COmmtlliity
<br />La Junta
<br />
<br /> , ,
<br /> , .
<br /> '. . ' . Stream 10';'yr' .' 50';'yr 100-yr 500c)'r'
<br /> Arkansas R.' 31,678. '. 69.183 90.465 156.200
<br /> King Arroyo 1,700 5.000 7.500 . 17.000
<br />. . Anderson Arroyo 2,230 ' 7.000 10,500 .23.000
<br /> Arkansas R.:' 11,200 . 28.000 40,000 B4 .000
<br /> Willow Cr. @ 2,850 . 8.400 12.700 28.000
<br /> Siphon : ~...
<br /> . -..
<br />
<br />tamar
<br />
<br />These flo~ rates'are contained in hydrologic reports for the Cities
<br />of La'Junta and Lamar) prepared by the A~ Corp of Engineers. in
<br />1978 and 1974. respectively. We have checked the'hydrologic results
<br />and found that all the'rivers studied by'theCOE used standard
<br />hydrologic methods. Further, the 100-yr frequency flow for King
<br />and AnderSon Arroyos show reasonable ,agreement with CDM's regional ...
<br />Arkansas River',trioutary analysis, as presented in the H,ydrologic ,'.:c\:
<br />Sutrrnary for Ntne Colorado Communittes~ (April 30'. 1980). The ....
<br />results for the' Arkansas River at ta Junta and Lamar from CDM' s','~ .
<br />statton'analysis fallwithtn the'90% confidence limits of the CDE ,
<br />analyses'tn thes'e reaches' '/',;C<>:', "."," ""';',0'",'",;,;,';
<br />.' .~. . - -' ".' - . ":=<':~.:.-:'-~' - . '. - :-^-::~~>-:~':'~'~':;,>~:::~~~~'~-':- . ;...:. - ',' --
<br />
<br />The hydrologic summary wi11~e"l"€visedwhen.all :.the hydrol.ogk
<br />analyses for eachcommuntty is finalized. If you have any further'
<br />questions or comments ,on the' flow rates. reconnnended for the cities.
<br />of La' Junta and Lamar, please let me know as soon as possible.
<br />
<br />Very truly yo' urs,':',;'" "", ' '." "'
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<br />CM.W DRESSER & McKEE
<br />
<br />Richard N. Wray
<br />Project Engineer'
<br />RNW/mrc.
<br />
<br />cc: Gene Jencsok~ CflCS
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