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<br />, II,- I~\1ESTIGATIOl'lS
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<br />2~01,. PreliminarYreCohnc\issan~e report investigations. - Investi-
<br />gations made in connection with theprelilni.nary reconnaissance report
<br />consisted of a general reeonnaissance, with a view toward determining the
<br />flood control needs of the area in tpe city of Trinidad subject to'inun-
<br />dation from floods originating in P;Lnon Canon. The investigations in-
<br />eluded an analysis of the flood damages, engineering design of struetures,
<br />estiniates of costi and.an analysis olf the econoniic justiJicat:\.on of the
<br />plan of improvement.Theeei~ves1;.ig~tions were pre.limi~ .1nscope in-~
<br />asmueh as the report wasp,epllred to; irlillcate the proba,b;Llity of deve:j.op-
<br />ing a desirable pr()j'i'ct ,within,tl!e, iptent CU1d.limitll~f. theatithority.
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<br />, 2-02. Other PuriSl,l.to:\.re River iinv<;lstigations. - The Flood Control
<br />Aet approved 22 Deeember .1944 (Publi:c Law 534, 75th .Oongres.s,2d Session),
<br />authorized a floodway project on the'P\1!'gatoire .River for Ioeal flood
<br />proteetion at Trinidad,.. Colorado. At definit.e project report on the
<br />authorized Trinidad Floopway has bee~ prepar:~d ~dsubmitted to the
<br />Office, Chief of Engineers, through ~he, Southw.estern Division Engineer,
<br />for approval. Investigations for re~ision of the Review. Report. on Flood
<br />Control on Purgatoire. River inelude iconsideration of a proposed multiple~
<br />purpose reservoir at the Piedmont :Br:idge Dam. ,site on Purgatoire River
<br />above Trinidad" T'he Pinon Qanon Dan! projeGt reported herefn is com-
<br />pletely independent ,of the aUthpriz~d flQodwayor aAV proposed reservoirs
<br />on Purgatoire River. Floodso/,;Lgin~tingon:Pinon Canon eausedamage
<br />before they enter thePurg9ctoipEi,Riyer.Thel;eJ;ore, benefits which would
<br />acerue to the flood control improvenlentfromprevention of flood damages
<br />on Pition Canon would ,not duplicate benefits estimated to acerue to the
<br />authorized Trinidad Flootlway on the [Purgato:\.re River., . .
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<br />2 -03. Projeet report investig~tionll. - Invesj;,igationS'which form
<br />the basis of this projeet report werle of .a more diltailed .nature and con-
<br />sisted of topographic surveYs, soilfj, foundati.on.~dr'olbgic, hydr'aulie,
<br />struetural, and economi.e' studies. liYdr'ologic ari.dhydr'aulic studies were
<br />eondueted to establish thespillwayidesign flood,projeet design flood
<br />and the hydr'aulic .designof the proposed dam and appurteriantstruetures.
<br />Detailed struetural design analYsesiwere ,made. to'determirie the engineer-
<br />ing features of, the project. ,:The r~sulisof the';detailed studies and .
<br />investigations are Gontained". in the! aeconiJ:l&nying appendices of this repqrt.
<br />Eeonomie .studies were made of.,benef~ts and costs to determine the economic..
<br />justifieation of the plan of: improv~ment. .
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<br />III -,;IiicA:L C6O:PERATION Rji;QUIRlI'b ,.. ...
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<br />3..01. .' L~cal eooperatiod. -All;horiztng legislati'onstipulates that
<br />responsible .loeal agencies give assi.lrariees satiSfaetory to. 'the Secretary
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<br />of the Nrrru that they wili11:'a} proYidew.ith,out eqst.to the United States "
<br />all,lands,easements, and ri.ghts-ofj"Way.neoo"Rary for the ".oP13I,~"IM,i.nl' c,f
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