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WSP11043
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Last modified
1/26/2010 3:15:49 PM
Creation date
10/12/2006 4:41:07 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8443.100
Description
Narrows Unit - Project Description
State
CO
Basin
South Platte
Water Division
1
Date
2/1/1978
Author
US DoI BoR
Title
SPECIAL REPORT Investigation of Review Issues Narrows Unit - Colorado Pick-Sloan Missouri Basin Program
Water Supply Pro - Doc Type
Report/Study
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<br />.. ~. '" -~ <br />lu~,j <br /> <br />The initial pool level for the 1963 simulation was slightly greater <br />than the 1967 initial pool level. During both years the above <br />described spring pattern occurred. During the summer of both years, <br />near surface stratification developed. However, there was no extensive <br />deepening of the thermocline as is usually the case in temperate lakes and <br />reservoirs. The thermocline that developed was never below 2.5 meters <br />in either year and was at about one meter deep for most of the time <br />that defined stratification was present. In addition to the thermocline <br />bei ng near the surfac~, it never thi ckened apprec i ab 1 y. The thermocl i ne <br />was usually one to two meters thick, but extended for four meters for <br />one week during 1967 and three meters for a week during 1963. On the <br />whole, the reservoir did not exhibit stable stratification during <br />either year. In both cases there was warm water inflow to the surface <br />throughout the summer. Despite the surface inflow the bottom wa ters <br />were warmed continually and rather extensively during both years. <br />This would indicate a 'surface exchange across the thermocline as well <br />as the influence of longwave radiation. Since the thermocline remained <br />relatively shallow, the hypolimnion was quite extensive and comprised <br />the greater part of the reservoir volume. In addition, the bottom <br />withdrawal s extended to the floor of the reservoir, such that there was <br />no indication of a "dead zone" in the area deeper than the outlet <br />works. On the basis of the extent of the hypolimnion, and consequently <br />the large dissolved oxygen reservoir, along with the evident surface <br />exchange, which was probably due to a combination of inflow-outflow <br />relationships and diffusion, it was concluded that the bottom waters <br />should remain aerobic during the summer. <br /> <br />The South Platte River carries a large salt load throughout most of the <br />year. Due to this, it was felt that there was a possibility that the <br />~alinity could c~eate density differences in excess of those resulting <br />from temperature. In such a case, chemical stratification could develop <br />and inhibit the above described exchange. However, the results of the <br />analysis indicated that the differences in salinity between the inflowing <br />water and the reservoir pool would be insufficient to overcome the <br />density differences resulting from purely thermodynamic processes as <br />described above. Therefore, there would be little likelihood of any <br />chemical stratification occurring. <br /> <br />I <br /> <br />. <br /> <br />20 <br />
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