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<br />( <br /> <br /> <br />Flood Damage Frevention ~~a5ure$ <br />Follo~inq the destructive September 1904 flood, the city <br />and concerned railroad companies cooperated in a project involvi~g <br />channel straightening and construction of concrete retaining walls <br />along the Purgatoire River throl.1gh the city's more congested urba n <br />area. In 1936 and 1938, thcworl<s Progress IIdminhtratior.did <br />additional bank protection work, including repairs to sections that <br />had suffered flood damage. The Pinon Canyon Dam, completed in 1954 <br />by the Corps of Engineers, protects a highly developed area of about <br />40 acres in the northwestern and central sections of the City from <br /> <br /> <br />floods originating in the precipitous pinon Canyon Arroyo. This <br />earthEill detention dam will detain flood di$charg~s up to and <br />including the Standard Project Flood, and an ungated outlet will drain <br />the reservoir within a reasonabl~ tiIne. Discharge from the ungated <br />outlet will not appreciably effect flood flows from the uncontroll~d <br />area below the dam. Th~ Corps' Trinidad Lak~ Proj~ct, located on the <br />Purgatoire River about four miles southwest of Trinidad, prOVides <br />regulation of flood discharges up to and including the Standard Pro- <br />ject Flood. Potentially damaging flows will be r~gulat~d as necessary <br />to li~it downstre~ flows to nonda~agin1 rat~s. Water stored in th~ <br />flood control pool will be released at the maxim~ nondamaging rate. <br /> <br />Tl", Soil C,,,,.erv,,tl,,n 5"""ioe ""n~t,,ucteJ darr,s on Ci1rt-"on a"d :'ishcr3 <br /> <br />Figure 12. P.OSPIT~L CANYON G P~~LL ARROYO BRIDOES <br />Top--u.s.Hi'lhway160-350culvcrtonllospit'lICanyo:\atMileO.29. <br />Bottom--Li<:denAv"'tluebrid"eonPo;.'ellArrovoatMilel.3C. <br /> <br />Feak Arroyos to prev~nt recurrent damag~s to the watershed and the <br />city of Trinidad. The structures are of earth construction with <br />ungated spillways that provide regulation of storms with a recurrence <br />interval greater than the Intermediate Regional flood. ~n earthfill <br />dike and unlined vegetativ~ channel, approximat~ly 2,000 feet in <br />length, diverts a small tributary of Fishers peak Arroyo into the <br />Fishers Peak Arroyo flood retarding structure. <br />The existing city zoning ordinance (~. 851, 5er1esof <br />1963) does not provide specifically for th~ preservation of flood- <br />ways or control development in flood prone areas. However, as a <br />condition fOl: participatin'l in t~L" N"tional l"lood InsuU.nce program, <br />~rinidad has llqrced to illlplelllent n<>oc! plain zoning in the reasonably <br /> <br />" <br /> <br />" <br />