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SPDSS_Task7-2_WellUseWellAugmentationPlans
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Last modified
4/17/2013 9:38:15 AM
Creation date
6/11/2008 2:31:12 PM
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Decision Support Systems
Title
SPDSS Task 7.2 - Well Use and Well Augmentation Plans
Description
This memorandum and associated appendices characterizes the 20 largest well augmentation plans and develops recommendations for representing well use and augmentation in SPDSS modeling efforts.
Decision Support - Doc Type
Task Memorandum
Date
12/14/2007
DSS Category
Groundwater
DSS
South Platte
Basin
South Platte
Contract/PO #
C153953
Grant Type
Non-Reimbursable
Bill Number
SB01-157, HB02-1152, SB03-110, HB04-1221, SB05-084, HB06-1313, SB07-122
Prepared By
Leonard Rice Engineering
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• Each well depletion Plan structure associated with an augmentation plan should be assigned a <br />priority date (administration number) to identify periods when the lagged well depletions are <br />in or out of priority with respect to downstream water rights. Absent other information, the <br />priority date for the well depletion plan structure should be based on the most junior ground <br />water right associated with wells in the augmentation plan. <br />Augmentation Plan Replacement Supplies and Recharge Accretions <br />The plans decreed in the 1970s and those subsequently filed and decreed typically follow a <br />similar mode of operations, based on the review of 12 augmentation plan decrees, conversations <br />with DWR personnel and ditch and reservoir company representatives, and review of data in <br />HydroBase and DWR's straightline diagrams. <br />• Diversions to recharge should be operated based on direct flow recharge water rights (for cfs <br />amounts) or recharge storage rights (for ac-ft amounts) with the ability to fill and refill when <br />the rights are in priority. Water rights specific to recharge use are difficult to extract from <br />HydroBase due to the many ditches decreed for recharge and multiple other uses. Therefore, <br />the information related to recharge water rights included herein are typically from decrees, <br />the straightline diagrams, and conversations with users. <br />• Due to the lack of specifics available for most recharge sites, it is recommended that recharge <br />sites be represented using: <br />- Specific capacities outlined in augmentation plan decrees or discussions with water <br />users, or <br />- Capacity equal to recharge storage right amounts (in ac-ft) plus direct flow right <br />amounts (in cfs) times 1.9835 ac-ft per cfs * 31 days per month. This approach <br />provides a demand for recharge "reservoir" ID to be modeled with the augmentation <br />plan. For example, an augmentation plan with a 100 cfs direct flow and two 400 ac-ft <br />recharge storage rights would have a total recharge storage capacity and target of <br />6,949 ac-ft (equal to 100 * 1.9835 * 31 + 2 * 400). <br />• Seepage loss rates should be assigned to recharge sites based on the engineering properties of <br />the underlying soils (e.g., standard permeability rates per Water District based on STATSGO <br />coverage) and an estimated average depth of five feet per recharge site. Recharge site <br />volumes, simulated diversions to recharge, and associated seepage losses should be used to <br />estimate the amount of un-filled capacity that can be filled in subsequent time steps. <br />• Diversions to recharge pit(s) should be simulated in priority year-round under the <br />augmentation plan recharge right(s) whenever excess capacity is available in the ditch. Ditch <br />losses should be accounted as input to recharge only during the non-irrigation season (i.e., if <br />no irrigation water is in the ditch). <br />• Accretions from seepage along the ditch length and/or multiple recharge sites under a <br />specific ditch augmentation plan are typically administered in aggregate on a monthly basis <br />below the main ditch headgate (for ditch plans) and/or above major calling rights (for ditch <br />plans and non-ditch plans). Model representation of river accretions should be accounted in <br />recharge Plan structures similar to how well augmentation plans are administered. <br />• Pumping augmentation wells to provide replacements directly to the river is typically done <br />when river depletions cannot be fully replaced by other sources. Lagged depletions from <br />augmentation well pumping represent an additional demand on the well augmentation plan. <br />13 of 16 <br />
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