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WSP11413
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Last modified
1/26/2010 3:17:20 PM
Creation date
10/12/2006 4:57:05 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8443.600
Description
Narrows Unit - Studies
State
CO
Basin
South Platte
Water Division
1
Date
2/1/1963
Author
Bor,
Title
Site Selecion Presentation to the South Platte Steering Committee
Water Supply Pro - Doc Type
Report/Study
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<br />~4 <br /> <br /> <br />< <br />use ot the'water belonging to a downstream senior priority ditch. <br />At the same time determination could be made of the magnitudes of <br />upstream "within" and "out of priority" diversions. The first <br />line ot Table 2 indicates how upstream diversions were made--3,OOO <br />acre-feet per year were obtained through exercising direct flow' <br />rights, 10,400 acre-feet were out of priority diversions and the <br />value in parentheses shows the 'magnitUde of' out of pribrity <br />diversion which was obtained by exchange. :!.'he remaining portion <br />would have been diverted under priorities in the 'upper area to <br />ditches other than those which we have shown using the water. <br />This was due to the "ideal" nature of our studies. <br /> <br />The second step of our exchange studies involves allowing <br />I <br />upstream junior priority ditches to divert to satisfy existing <br />demands ifl (1) the flow between the point of' diversion and the <br />reservoir was sufficient; (2) the flow was historically diverted <br />by downstream ditches, and (3) there is water in storage to <br />replace the out of priority upstream diversion. M seen in line <br />2 of ~able 2, 18,000 acre-feet was by exchange from Weld Oounty <br />Reservoir, and 26,&>0 acre-feet was obtained by exchange with ' <br />Narrows Reservoir. The sum of the two parts indicates that <br />26,500 acre-feet may be exchanged by Weld Oounty and 33,800 acre- <br />feet by Narrows under adjusted historic conditions. <br /> <br />Reservoir Operation <br /> <br />This subject will be covered later in detail so I will <br />outline very generally some of the more important aspects. These <br />involve water supply and ditches participating in reservoir <br />service. <br /> <br />Reservoir Yield <br /> <br />The storable flow at the site includes return flow from with <br />project exchange service, inundated lands water supply generation, <br />evaporation savings from reservoir replacements, and unused flow <br />, in the river. Evaporation as a result of on-channel storage was <br />estimated on an annual basis and subtracted from the gross supply <br />to get the new water yield. <br /> <br />Participating Ditches <br /> <br />There was not a sufficient reservoir supply to adequately <br />meet all downstream requirements from either reservoir. In' <br />determining the criteria we adopted the policy of providing nearly <br /> <br />~ <br />
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