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SPDSS Phase 4 Task 48.2 Development of <br />Calibration Targets and Criteria -Final <br />To: Ray Alvarado, CWCB <br />From: Camp Dresser and McKee h1c. <br />Mike Smith, Mark McCloskey, Bill Fernandez, and Gordon McCurry <br />Subject: SPDSS Groundwater Component Phase 4 Final Task 48.2 Technical <br />Memorandum, Development of Model Calibration Targets and Criteria, <br />South Platte Alluvial Groundwater Model <br />Date: October 8, 2008 <br />Introduction <br />Phase 4 Task 48 of the South Platte Decision Support System (SPDSS) includes calibrating a <br />groundwater flow model of the alluvial aquifer system within the South Platte Alluvium <br />Region within Water Division 1. T11e model includes wlconsolidated alluvial deposits of t11e <br />South Platte River ma>1lstem, extending downstream from C1atfield Reservoir to t11e Nebraska <br />state line at Julesburg. In addition, the model includes unconsolidated alluvial deposits of the <br />major tributaries to the South Platte River downstream of Chatfield Reservoir. <br />This Technical Memorandum (TM) was undertaken under Task 48.2 of Phase 4 of the SPDSS, to <br />develop calibration criteria, including selection of field data (targets) to be used daring the <br />model calibration. This TM summarizes the methodology and data that are anticipated to be <br />used in the model calibration process. <br />Approach <br />Calibration targets and calibration criteria Have been developed for bofll the steady-state and <br />transient model simulations for the SPDSS alluvial groundwater model. A general description <br />of model calibration and the process that will be used to calibrate the SPDSS model are <br />described in Sections 1 and 2, respectively, of this TM. Several types of data are used as targets <br />in the model calibration; using multiple targets increases the confidence fllat the model <br />accurately represents the stresses imposed on it. The calibration targets and the periods used to <br />represent the steady-state and transient calibration periods are discussed in Section 3. The <br />numeric values (criteria) that will be used to evaluate how well the model is calibrated are <br />described in Section 4. Sections 5 and 6 provide a summary and recommendations, <br />respectively. The following table sununarizes t11e sections contained in this TM. <br />P~ SPDSS T~8 2 Final TM 10-08-0t~.doc <br />