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Last modified
1/26/2010 3:16:45 PM
Creation date
10/12/2006 4:51:53 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8142.100
Description
Trinidad Project - Studies - Operation Studies
State
CO
Basin
Arkansas
Water Division
2
Date
1/1/1996
Author
CWCB
Title
Trinidad Background Info Notebook Part 5
Water Supply Pro - Doc Type
Report/Study
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<br />. <br /> <br />. <br /> <br />. <br /> <br />1.913 <br /> <br />The second event shows additional water accumulated in the Flood Control account <br />du ri ng the Augu st 4, 1981, through August 12, 1981, per i od. The maxi mum amount <br />of flood water in storage occurred on August 12 at 7,071.01 acre-feet. Release <br />of the total 7,071.01 acre-feet is shown to have been made during the August 11 <br />through August 17 period. A review of the records indicate that ditch diver- <br />sions during the flood water release period were zero with minor exceptions. <br />Recorded reservoir releases at the gauging station "Purgatoire River below <br />Trinidad lake" exceeded flood water released plus Project diversions. However, <br />records for the gauge "Purgatoire River at Trinidad" for four out of the seven <br />days of flood water release show significantly less flow than was released from <br />Trinidad Dam. Since these two gauging stations are only about three miles apart <br />and only minimal diversion occurred between the two, it appears that one or the <br />other of the gauging stations is in error. As such, it is inconclusive whether <br />flood release during this event did or did not pass the Project area undepleted. <br /> <br />Ouri ng the th i rd event, a tota 1 of 3,914.00 acre-feet of flood water was stored <br />during the September 3, 1981 through September 13, 1981 period. The maximum <br />accumu 1 at i ve flood water in storage occurred on September 8 at 3,228.31 acre- <br />feet. The total of 3,914.00 acre-feet of stored flood flows is shown to have <br />been released between September 9 and September 15. Review of ditch diversion <br />records indicate that total diversion rates increased during the September 9 <br />through September 12 period. Total recorded ditch diversions reached a maximum <br />of 220 cubic feet per second by September 12. Flow records of total reservoir <br />release, PrOject diversions, the Purgatoire River at Trinidad and Thatcher <br />gauges indicate that the flood water released passed the Project area undepleted <br />by project operations. <br /> <br /> <br />The fourth event shows flood water stored during the April 1, 1982 through April <br />11, 1982 period totaling 259.81 acre-feet. Flood water releases totaling 259.81 <br />acre-feet are, shown to have been made between April 15 and Apri 1 20, 1981. <br />Analysis of the flow conditions during this extended period indicate that the <br />length of time of storage, retention, and release was excessive. Also, the rate <br />of flood water release {maximum of 25 c.f.s.1 was too low. Based on the flow <br />records for this 'event it is inconclusive if release of this water was carried <br />out to avoid depletion to downstream users. <br /> <br />The fifth event of flood water storage and subsequent release occurred over the <br />two day span of Ju ly 31 and Augu st 1, 1984. A tot a 1 of 106.42 acre-feet was <br />stored and released. The flow records indicate that the reservoir release on <br />July 31 was slightly less than flood water released plus project diversions. <br />Therefore, whether the flood water passed the PrOject area without depletion is <br />also inconclusive. <br /> <br />. <br />. <br />. <br />I <br />. <br />. <br />. <br />. <br />Ii <br />. <br />.~ <br /> <br />A letter from the law firm of Hill & Robbins, representing the State of <br />Colorado, dated September 9, 1987, explains the procedure for release of flood <br />flows from Trinidad Oam as requested of them during the meeting of February 5, <br />1987. The letter, after referring to the procedure as outlined in the Operating <br />Principles states, "The water commissioner does this by computing the amount of <br />i nfl ow temporari ly deta i ned. When such flood waters are re 1 eased, the water <br />commissioner requires them to be bypassed by the Project ditches. He does that <br />by either requiring the di,tches to bypass such releases or increasing the <br />release from the reservoir to an amount in excess of what the ditches are <br />diverting." <br /> <br />We bel i eve that requi ri ng each ditch to bypass the fl ood releases wi 11 ade- <br />quate ly protect the downstream interests, provi ded the bypass is measured at <br /> <br />50 <br />
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