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• <br />additional calibration will be conducted after reviewing and potentially modifying the <br />conceptual model. <br />• After the model is calibrated a sensitivity analysis will be conducted. The sensitivity analysis <br />will be undertaken as described in Task 48.2. The results will be evaluated and will provide <br />insight into data gaps, conceptual errors and other aspects of the model that could be <br />improved in the future. These will be discussed in the model documentation. <br />Deliverables: <br />• ATM will be prepared documenting the calibration. A draft will be presented to the State for <br />review and comment. It is anticipated this TM will be up to 10 pages in length, not including <br />figures, tables and appendices. The model input and output files will be included with this <br />TM in a machine readable format. After resolution of comments, this report will be presented <br />to the PRC for review and comment. After resolution of comments, the report will comprise <br />Appendix M of the final report as described in Task 48.6 below. <br />• It is anticipated that the draft TM for this task will be submitted to the State approximately 10 <br />months after State approval of the Phase 3 model and that the final TM will be ready <br />approximately 12 months after State approval of the Phase 3 model. <br />• Ail model input and output required to duplicate the model execution, calibration, verification <br />and sensitivity analysis will be documented and provided in digital format to the State in a <br />format suitable for posting on the CDSS web site. <br />Task 48.4 Develop Unit Response Functions <br />• The calibrated model will be used to develop unit response functions (URFs) describing the <br />impact and timing of a unit addition or removal of groundwater on streamflow. These URFs <br />will be developed using the calibrated transient model by applying a constant stress at a given <br />point and simulating the impact on various reaches of the river over a 20 to 100 year period, <br />using a monthly time step. Up to 500 points may be evaluated, selected in coordination with <br />the State depending on the spatial variability in the calibrated aquifer properties, stream <br />parameters and aquifer stresses. The Iocations of the unit stresses will be selected to represent <br />different reaches of each simulated alluvial valley, with most located in the South Platte <br />alluvium. This unit stress will be exercised along with existing stresses in the model for 20 to <br />100 years as developed in consultation with the State. <br />• This evaluation will use automation tools developed as part of Task 50. <br />Deliverables: <br />• ATM will be prepared documenting the development of unit response functions. It is <br />anticipated this TM will be up to 10 pages in length, not including figures, tables and <br />SPDSS_Phase4_gw_SOW 09-IS-06.doc 14 <br />