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C150243 PIF Documents
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C150243 PIF Documents
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Last modified
8/30/2016 11:32:30 AM
Creation date
8/30/2016 11:32:15 AM
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Loan Projects
Contract/PO #
C150243
Contractor Name
Aurora, City of
Contract Type
Loan
Loan Projects - Doc Type
Contract Documents
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the demand rates to calculate total treated water demands. Population projections,based on <br /> an annual growth rate of 1.7 percent, indicate that Aurora's current population of <br /> approximately 300,000 will increase to over 600,000 by 2050. <br /> Water Supply and Water Rights <br /> Aurora Water,through the PWP,will re-divert legally re-usable water.As a general rule in <br /> Colorado,appropriators are allowed one use of water and the water left over after that use <br /> goes downstream to the next user.The exception to this rule is legally re-usable water. <br /> Legally re-usable water is water from trans-basin sources (Aurora's Colorado River and <br /> Arkansas River water rights),deep wells (Aurora's Denver Basin wells)or previously court <br /> changed water rights (Aurora's South Park water rights).Colorado water law does not <br /> require approval to re-divert legally re-usable water if the water is withdrawn through a <br /> ditch diverting from a stream(excerpted from BHF,2006). <br /> To save money on water treatment by taking advantage of natural purification processes, <br /> Aurora Water plans to divert its legally re-usable water through tributary wells constructed <br /> close to the South Platte River,rather than through ditches.Tributary wells affect stream <br /> flow on a delayed basis,and as a result, Colorado water law requires all tributary wells in <br /> over-appropriated basins (the South Platte River is over-appropriated)to obtain water court <br /> approved plans for augmentation.The water court will approve a plan for Augmentation if <br /> Aurora Water demonstrates that the time, location, and amount of well depletions equal the <br /> re-usable water sources Aurora Water has available at the same location on the stream. <br /> Aurora Water has ample re-usable water resources to obtain the plan for augmentation, and <br /> its counsel anticipates water court approval of the augmentation and pumping plan.There <br /> are no legal impediments to obtaining the required water court approvals to operate the <br /> Prairie Waters Project(excepted from BHF,2006). <br /> Water Storage <br /> Storage within the raw water supply system is extremely important to meet annual <br /> operational needs as well as demands during extended dry periods.Aurora Water utilizes <br /> its storage facilities annually to meet fall and winter water demands.The need to use <br /> reservoirs for annual operation will continue into the future and will become even more <br /> critical with additional City growth. <br /> During dry years when direct diversions do not satisfy annual water demands,water <br /> demands are met by water delivered from long-term reservoir storage.A review of supplies <br /> versus demands shows that this hydrologic situation occurs about 15-percent of the time,or <br /> on average about once every seven years. <br /> Development of the Prairie Waters Project <br /> In development of the PWP,Aurora Water initially considered 37 raw water supply project <br /> elements. These elements were screened down to 24 potential project components,and <br /> subsequently evaluated using a decision analysis tool.Evaluation criteria used in the <br /> decision analysis tool included permitting,institutional,public,schedule,cost,yield, <br /> flexibility,and sustainability considerations. The criteria were assigned a weight and each <br /> project component was scored and ranked. <br /> 3 <br />
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