Decision Support Systems
4/17/2013 9:38:15 AM
6/11/2008 2:31:12 PM
Decision Support Systems
SPDSS Task 7.2 - Well Use and Well Augmentation Plans
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
SB01-157, HB02-1152, SB03-110, HB04-1221, SB05-084, HB06-1313, SB07-122
Leonard Rice Engineering
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believed to be accurate. However, this information should not be relied upon in any legal <br />proceeding. <br />BACKGROUND <br />Water rights transfers, substitute water supply plans, and augmentation plans have been and <br />continue to be used more frequently in the South Platte River basin as compared to other river <br />basins in Colorado. Well use in the basin grew significantly after the 1950s drought and well <br />development increased over time through the 1970s. The Water Right Determination and <br />Administration Act of 1969 established the requirement that wells operate within the priority <br />system. The wells continued to operate from this point forward under substitute water supply <br />plans approved by the State Engineer. Because of several Colorado Supreme Court decisions and <br />the drought of 2002, the Colorado Legislature passed House Bill 02-1414. The bill requires, in <br />most cases, that augmentation plans be filed with the Water Court prior to submission of a <br />substitute water supply plan for approval. This bill was amended in 2003 under Senate Bill 03-73 <br />to allow wells in the South Platte basin up to three years to file plans for augmentation with the <br />Water Court while operating under temporary plans approved by the State Engineer. <br />DEFINITIONS <br />For consistency in terminology, the following definitions are used herein: <br />Decreed Alternate Point Wells -Wells decreed as alternate points to surface water rights that <br />divert based on the priority of the surface water right. Requirements for wells to be considered <br />alternate points has changed over time, but the decreed alternate point wells used herein are <br />based on older decrees, which do not require the wells to be located within a specific distance to <br />the river. Representation of decreed alternate point wells should account for lagged depletions to <br />the river but should not require replacement when diverted in priority. <br />(Well) Augmentation Plan -Method for junior ground water right diverters to replace pumping <br />depletions in the river to protect senior water rights. Augmentation plans are administered based <br />on terms and conditions adjudicated by the Water Court. Elements of a well augmentation plan <br />typically include: <br />• Demands -Lagged river depletions in time and location due to well pumping. <br />• Supplies -Replacement /augmentation sources, including natural stream flows, recharge <br />water rights, recharge pits, and reservoirs. <br />• Operations of the supplies to meet the demands. <br />Ditch Augmentation Plan - An augmentation plan associated with a ditch service area that <br />provides replacement water predominantly to wells irrigating under the ditch (e.g., Fort Morgan <br />Canal augmentation plan). The wells covered by these plans may or may not receive surface <br />water supplies directly from the ditch. <br />Ground Water Only Acreage -Irrigated parcels that use ground water as the only supply <br />source based on the SPDSS 2001 GIS Irrigated Acreage Assessment. <br />2of16 <br />
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