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• <br />Approach: <br />The overall approach is to prepare and document the individual components of the model. The <br />model will then be presented to the State and then to the Peer Review Committee (in Task 51.5) <br />for review and acceptance. The key components of the model under this Phase 4 effort are to <br />develop and configure the stress inputs, develop calibration targets and criteria, calibrate the <br />model, and then apply the calibrated model to developing unit response functions for stream- <br />aquifer interactions. These are described under Tasks 48.I through 48.4 below. In addition, the <br />unit response functions will be compared to existing stream depletion factors as described in Task <br />48.5. Each of these components will have a technical memorandum developed, which will <br />become an appendix of the overall modeling report prepared under task 48.6. <br />Task 4$.1 Configure Stress Inputs <br />This task will develop and document the model inputs used to simulate aquifer stresses and <br />boundary conditions. As described below, some of the stress inputs will be developed from <br />information provided by other SPDSS Contractors. Aquifer stresses include activities that add <br />water to or remove water from the groundwater system and include pumping, recharge, <br />evapotranspiration, discharge to streams, flow to or from adjacent aquifers, and boundary inflow <br />and outflows. Diversion locations will also be finalized in the model as part of this task. <br />Some of the information regarding stresses on the alluvial aquifer, including agricultural <br />pumping, canal and diversion locations, diversion amounts, evapotranspiration and recharge, <br />will be obtained from other contractor teams, in formats compatible with the data centered <br />modeling interface tools. This information will be reviewed and processed to develop model <br />input files using the tools developed under Task 50. These tools will be used to convert each <br />set of aquifer stress data (pumping, recharge, etc) into the correct model cell and model stress <br />period. It is anticipated that in many cases a given model cell will contain several different <br />zones of a given aquifer stress (different recharge values representing irrigation, for example) <br />and also multiple wells and multiple canals and streams. <br />Based on review of StateCU model output, it is anticipated that the native ET and recharge <br />will be provided for each model stress period in a format compatible with Task 50 DMIs. <br />Agricultural pumping will be determined by other contractors using StateCU and provided to <br />CDM in formats that are consistent with the Task 50 preprocessors. Municipal and industrial <br />pumping estimates are being developed in Phase 3, Task 41. These water budget components <br />will be processed by CDM and converted to model input f les using the Task 50 processes and <br />tools. <br />Since much of the stress-related model input data is being prepared by other contractors, this <br />task will not proceed until the information from other contractors is available. The task budget <br />includes a limited amount of time for coordination with these other parties as described in <br />Exhibit D3, Task Compensation. <br />SPDSS Phase4_gw_SOW_09-IS-06.doc <br />