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Last modified
1/25/2010 7:09:15 PM
Creation date
10/5/2006 2:21:23 AM
Metadata
Fields
Template:
Floodplain Documents
Designation Number
43
County
Las Animas
Community
Trinidad
Stream Name
Purgatory River and Tributaries
Basin
Rio Grande
Title
Floodplain Information Report - Purgatory River and Tributaries, Vicinity of Trinidad, Las Nimas County, Colorado
Date
4/1/1974
Designation Date
2/1/1975
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />FtnuREFLOQDS <br /> <br />general region ~ere cOMpared, adjusted ~hen necessary, and used for <br />the """,lysis. Tte Intermedi"h Regional Flood ..-Ith a peak diSCharge <br />of 24,500 cubic feet per second is compa~able with the flood of <br />August 2, 1950 that had a peak discharge of 23,900 cubic feet pe~ <br />secor.d. <br /> <br />This section of the report discusses the Intermediate <br />Regional Flood and the Standard P~ojoct Flood and some of th~ hazards <br />of floods. The Corps of Enginee~$, in cooperation with the NC.AA <br />Weather Service, has made comprehensive studies and investigations <br />based on the vast ~eco~ds of experienced storms and floods and has <br />evolved generalized procedures for estimating the flood potential <br />of wate~ways. <br />Only in raro instances has a st~eam experienced the <br />largest flOOd that is possible. Seve~e as the maximum known flood <br />may have been on a stream, it is generally accepted that a larger <br />flood will occur. Larger floods have been experienced on strea~s <br />with similar geographical and physioqraphical Characteristics as <br />those streams in the study area. In any determination of future <br />floods that may occur, it is desirable to consider all storms and <br />floods that have occurred in the region on similar ~atershed$. <br />Severe storms, similar to those causing previous floods, <br />undoubtedl\, >.-111 recur in the Purg"toire River \>atershed to cause <br />future Hoods. Flooding may still be, expected below t;,e dam but at <br />less freC['J"nt intervals than historic event~. f'uture floods alonG" <br />the Purgatoir~ River and tributaries in the study ...rcu c~n equ~l or <br />surpass known h~stor~c floods. <br /> <br />"l'l:e maximUItlknown floods that have ""curred within the <br />geographical region are listed in Table 4. flood characteristics <br />of the Intermediate Regional Flood for averaged maximum conditions <br />within the study area are sho~~ on Table 5. <br /> <br />Intermediate Regional flood <br />The Intermediate Regional rlood is oenerally represent_ <br />ative of floods that have occurred in tte past and may be expected <br />to recur in the future. ':'h" lntormediate Regional flOO<1 represellts <br />a major flood, although it is less severe than the Standard froject <br />n=<l. <br /> <br />The magnitude of the lntermediate Regional flood On <br />the Purgatoire River and tributary study reachea was determlned from <br />statistical analysis of regional annual peak flow records. Also, the <br />variable rainfall and ~unoff charaotoristios of watersheds in the <br /> <br />" <br /> <br />;0 <br />
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