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<br />II- INVESTIGATIONS
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<br />2-01. Preliminary re~~sance report investigations, - Investi-
<br />gations made in connection with the. pre~iminary reconnaissance report
<br />consisted of a general reconnaissance, with a view toward determining the
<br />flood control needs of the area in the city of Trinidad subject to inun-
<br />dation from floods originating in Pinon' Canon, The investigations in-
<br />cluded an analysis of the flood damages, engineering design of structures,
<br />estimates of cost, and an analysiS of the economic justification of the
<br />plan ,of improvement. These investigations were preliminary in scope in-
<br />'asmuch as the report was prepared to indicate the probability of develop-
<br />ing a desirable pro'ject within the intept and limits of the authoriiw.
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<br />, 2-02 . Other Purgatoire River inve,stigations, - The Flood Control
<br />Act approved 22 De,cember 1944 (Public Iiaw 534, 7tJth Congress, 2d Session),
<br />authoriiieda floodway pro.ject on the Purgatoire River for l(lcalflood
<br />Protection at Trinidad, Co~orado. A definite project report on the
<br />authorized Trinidad Floodwa.y,has been prepared and submitted to the
<br />Office, Chief of Engineers, 't'hrough the Southwestern Division Engineer,
<br />for approval. Investigations for revision of the Review Report on Flood
<br />Control"oh,Purgatoire River iJ;lclude consideration of a proposed multiple-
<br />purpose reservoir at the' Piedincint Bridge Dam site on Purgatoire River
<br />above Trinidad, The pinon ",Canon Dam project reported herein i$ com-
<br />pletely indepen4ent of the'authorizedfloodwayor any propo$ed reservoirs,
<br />(lh Purgatoire ,River. Floods originating on Pinon Canon cause damage
<br />before they enter the Purgatoire River. Therefore, benefits which would
<br />accrue to the flood control improvement from preventionof'flood damages
<br />on 'Pinon Canon would not dupl:l.cate benefits estimated to accrue to the
<br />autl10rized Trinidad Floodway' on 'the Purgatoire Hi ver.
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<br />2-03. Proje~t repor~)iI:iVestigations: ,.:. Investigations which form
<br />the, basis of this projlilct:teport were, 6f a more detailed nature and con-
<br />sisted of topographic;sltt.veys,soils, fe>undation, hydrologic, hydrauliC,
<br />structural, and economic studies. HydrologiC imd hydrauliC studies were
<br />conducted to establ;i,sh, the spillway design f;Lood,project design flood
<br />and the hydraulic design' of the proposed dS!ll .and appurtenant structures.
<br />Detailed stJ:'uctUral ,cj.~signana:lyses were made to determine the engineer-
<br />ing features 0+ the,'pfoject. .orhe'l:'est!1ts,;cif,tl1~' detailed studies and
<br />,investigations are, contatned'itr thlil accompll!1Y'irig,appendices of ,this report,
<br />,,' ,),Economic studies',wElre ,made of benefits and costs to determine the economic
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<br />r,,:'~~ustification pf' tqe'::Ji>1~6r improvement.,
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<br />(:t~I,' :"100A..L COOPERATION REQUIRED
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<br />3-01, Local cooperation.,' -.Authorizing legislation stipulates that
<br />responsible local agencies give assUrances satisfactory to the Secretary
<br />, of the Army that. they will: (a)providi;l without' cost ,to the United states
<br />all lands, easements, and riglrt:s..6f~wllY' necessary for the construction, of:"
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