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C150104 Feasibility Study
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C150104 Feasibility Study
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Last modified
8/4/2011 10:05:51 AM
Creation date
3/4/2008 10:37:41 AM
Metadata
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Loan Projects
Contract/PO #
C150104
Contractor Name
Groundwater Appropriators of the South Platte
Contract Type
Grant
Water District
0
Loan Projects - Doc Type
Feasibility Study
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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />58% of the days where flows are below 120 cfs, which also equates to a long term average of37 days <br />where the flows at the State line are supplemented by releases. More severe assumptions in the <br />modeling reduced these benefits down to approximately 24 days of augmentation to compact flows. <br /> <br />D. Water Supply <br />The construction of an off channel reservoir would be dependent on a junior water right for diverting <br />water or the transfer of a senior right. Flows in the South Platte River significantly increase during <br />the winter months due to return flows entering the river. There is generally no call on the river <br />during the winter months, which would allow a junior diversion to the reservoir to operate. This <br />would provide the prime opportunity for diverting water to the reservoir. <br /> <br />On a number of days during the April 1- October 15 period, the historic gage flows of the South <br />Platte River at Julesberg have exceeded 120 cfs. This would indicate that a reservoir could divert <br />some water during this time period as well and store it for re-regulation when the flow in the river <br />drops below 120 cfs at the state line. This would allow the reservoir to fill and refill. <br /> <br />An analysis of the gage flows was done using this concept. Several diversion capacities were <br />assumed to optimize the effectiveness of a 2,000 acre-foot reservoir. Using the fill and refill concept, <br />a 2,000 acre-foot reservoir would be able to re-regulate up to 2,400 acre-feet annually. The flows in <br />the river increase above 120 cfs enough in the late summer months to usually allow filling by the end <br />of October. The primary control on filling and refilling the reservoir is the outlet capacity back to the <br />river. Optimization modeling will be necessary at the preliminary design stage for selecting final <br />sizes of the reservoir components. <br /> <br />Flows in the river would also be augmented by returns flows entering the river from the Tamarack <br />Project. These flows will also provide some benefit to the river which could be enhanced by the <br />operation of this project. The exact relationship of how these projects are operated is still in the <br />formative stages. <br /> <br />This study conclusively shows that the winter flows in this reach of the river are adequate to fill a <br />reservoir of this size the majority of the time. Flow records for the South Platte River were analyzed <br />for a 30 year historic study period (1966-1996). One can assume from historic records that any other <br />diversions that occurred during the winter months would be reflected in the gage and that the <br />recorded flows would be in priority for a junior diversion on the lower reach of the river. The <br />information available indicated that in all but two of the years (1977 & 1978), there would be <br />adequate flows in the river to allow for the diversions needed to fill the reservoir. The information <br />and assumptions that were used to estimate the quantity of water, which was available for dliversion, <br />are as follows: <br /> <br />· Average daily stream gage records were obtained for the USGS Jules burg gage station <br />for the period of 1966-1996. <br />· Criteria for when diversions would be allowed were based on the requirements of the <br />South Platte River Compact and the Colorado prior appropriation doctrine. <br /> <br />Table 2 entitled "Summary of Reservoir Operations - Fill/Refill Scenario" is a summary of the flows <br />estimated to be available for diversion into the reservoir site. The USGS gage records wen~ recorded <br />as average daily flows at the Julesburg gage. Flows in the river during the winter months were <br />assumed to be available for storage. In addition, flows during the period April 1 - October 15 were <br />assumed to be available for diversion if the Julesberg gage was above 120 cfs. Flows during this <br />time period would be diverted under a refill right for the reservoir. There were no detailed <br /> <br />7 <br />
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