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<br />Revised 30 Bep 8"-,,;;'
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<br />HYDROJ,OGY
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<br />]'ORrIFICATION CREIDK AT CBAIG, COM.
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<br />1" O'bjecto__tthis appendix: presents th~ synthesis of the standard.
<br />project 8ll.d maxilnu.-n proba.ble floods used as a. basis for flood-control
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<br />studies of Fortlfic~tion Creek a.t Oraig, Oo~o~
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<br />2. ~~~'al dp.BcrJ"[It1o.n~,~:~ortificatio!l Creek, in the northwestern
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<br />ps.rt of Colo:r.e.d.o, is a tribut&.T'".r to Yampa Jiver. The stream has a
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<br />dra.inage ~rea of 259 squa.!'e miles. I..:oat of the aroa 13 composed of
<br />rolling hills with a. covel~ of engeb~Jsb and graes., Tho slope of Fo:rtifi-
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<br />cation Creek i. relativel,y nat for much of it. l~l-mile 1enl!:th (iilclud1hl!:
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<br />So~th Fork of Fortifioation Creek)i for the lower 26 miles it has an
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<br />average slope of only 12 feet pel' mile. The northeast par.t of the area
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<br />is mountainous with ~ cover of grasses. bruBh. and trees. El~tion
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<br />ranges from .6,200 feet at Craig to ).0.500 feet OIl the northe':1.st boundary.
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<br />General topography is shown on plate 1. A:1 elevo.t1on_a;:-ea curve is shown
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<br />3. H..v.irometeorological charac~er:l.Bt1G~. ..-Most storm precipitat'on
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<br />Paclf~c origin. Precipitation at this type covers ma.n,y thousands of
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<br />square miles and usually falls as snow. Dur:l.t1g the spring alld summer the'
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<br />principal sonrce of moiettU'e is the Gulf of Mexico.
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<br />that comprise ~he Continental Divide cauee much of the moisture in the
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<br />air from the Gulf to preoipitate on the eastern elopes.. Consequently.
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<br />heavy precipit~tion ~uriQg the opring and Sl~~er is infrequent in the
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<br />fall intensities of short duration are common durlQg the Bummer. L~ge
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<br />floods from general s~er storma and thunderstorms life very infreqUl'Dt..
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