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<br />. .'. . PROJEGr :tlEPOl'lt
<br />ON.
<br />PINON CANON DAM
<br />TRINIIiAD, .COLORADO
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<br />APPENDIX I
<br />HYDROLOGY
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<br />I - INl'RODUCTION
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<br />oc""i ),.:",01. P'UI'pose. - The p'UI'pose of this" appendix is to present biisic
<br />hydrologic data used in developing the project plan for pinon Canon Dam
<br />on Pirion Canon l~rqyo at Trinidad, Colorado.
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<br />II '-. WATERSHED9l!flRflpTERI3rICS
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<br />2 -01. Climate, ,:: 'the · Pinon Canon ArroYo . drainage basin.at Trinidad
<br />is""cha:ir'{lcteri~ed:'by -j:trtense 10 caltil1l1'\<lerstorms,. in summer ...,.rid model' ate,.._
<br />to heavy snowfall in wInter months . The change from summer to Winter. is
<br />chara:pt.eriz~d:~by the sudden disappearance of thunderstorm activity fol-
<br />lowed /by :th.E!l plear winter :we,athertha~' dominates this area between
<br />frontal pas!3"a-gllll. Storms during the summer months ar-e, ,uaually of the.
<br />thunderstorm type and are most active during July and August. These'''
<br />thunderstorll\'S, caused by orographic lifting, usually re!l~!'l theiJ!".Jlla#mum
<br />intensity in late afternoon and evening and are often accompanied'by
<br />very heavy .19cal showers. The. mean annual temperature a1;",Trinidad,as ".
<br />indicated bj!':47 years of intermittent record is 52 degrees Fahr'enh\!itl.t ..,
<br />with a maximum of 99 degrees and a minimum of -26 degree$,~ The b'a$'ln',
<br />is charac1eerized by low relative humidity and the average 'is aOG-hit;' Y
<br />52 percent, 'The prevailing wind at Trinidad is westerly 'With the
<br />greatest.:'Wind movement occurring during the spring month~t The maxi-
<br />mum wind 'velocity recorded at the nearest first order, U;'-:-S. Weather
<br />Bureau Station, Pueblo, Colorado, waa 58 miles per hour froilfthe
<br />northwest. This station shows a wind movement similar to that at
<br />Trinidad,cQolorado. .
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<br />2-02. Precipitation. - The ave~age annual precipitation ~t
<br />T'riniaa:d;"-COl'ora:d(r;,-.tr~stl"d'''un -52'-yeari!t{)f record, is. 1.6-83 inches, Tl)e,..
<br />greatest precipitation occurs auring the spr.~ngand'summer monthS;
<br />April - August, averaging abQ.1.l,t 61 percent ,9f:,the tbtal. .. The maximum .
<br />recorded 24-hour precipi tationat Trinidad lili:S },73 inches an d oc-
<br />curred 1 September 1942. The average annual "anowfall is 57.4 inches,
<br />with a maxi;mum ann4, of Jl,8.5 inche~ and a minimum of 16.0 inches,
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<br />2-03 .t,>~li'ioods.; r:- Flood ~rod.wcj;ri~ ~torms over thEl Pinon Canon. .
<br />drainage area are. generally of the thunderstorm 'type' and occur during
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<br />Appendix I
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