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<br />The initial pool level for the 1963 simulation was slightly greater <br />than the 1967 initial pool level. During bDth 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 intemperate 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 surface, it never thi ckened appreci abl y. The thermocli ne <br />was usua.lly one to two meters thi ck, but extended for four meters for <br />one week duri ng 1967 and three meters for a week duri ng 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 sur'face inflow the bottom waters <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 />withdrawals extended to the floor of the reservoir, such that there was <br />no indication of a "dei:ld 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 />relationshi ps 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,itwas felt that there was a possibility that the <br />.sali nHycou'ld cr,eaj:ecterrsity differ,enc:es.inexcess .0fthOse resulting <br />from temperature. In such a case,chemical stratification could develop <br />and i nhibitthe above descri bed 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 />20 <br /> <br />,-',;: <br /> <br /> <br />",-<;.", <br /> <br /> <br /> <br /> <br /> <br />