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i ~ ~~ <br />Task 18 -StateMod Support GIS Data Management Interface <br />Background: <br />StateDGI is an existing data management interface that uses ArcView to analyze GIS data and <br />format it for use by a ground water model. To meet current DSS standards the SPDSS Feasibility <br />Study identified the need to update the existing StateDGI to enhance functionality and update the <br />program to the ArcGIS software package. In addition, the current version of the ground water <br />modeling software GMS may include some of the functionality currently performed by StateDGI: <br />Finally, other aspects of the SPDSS identified the need for new GIS tools which could be used to <br />automate and reproduce analyses to create input data for both StateMod and StateCU. These <br />enhancements include the ability to aggregate diversion and well structures; delineate drainage <br />areas; identify the location of surface return flows, assign climate station weights, assign soil <br />parameters to irrigated lands, and calculate canal lengths. <br />This task will make every effort to develop one consistent tool (method) to process GIS data for <br />both ground water and surface water (StateCU and StateMod) models. The consistent tool may <br />range from something that looks and operates like the existing StateDGI to something that <br />operates as a custom tool from the ArcGIS software. Also some of the existing StateDGI <br />capability may be available in a new version of GMS, the ground water modeling graphical user <br />interface. Therefore prior to executing this Task the contractor will investigate, discuss and <br />recommend a development approach for approval by the State's project manager. No work will <br />be performed until the approach is mutually agreed upon in writing between the contractor and <br />State project manager. <br />This task is expected to include extensive coordination with State GIS personnel to insure the <br />tools developed are appropriate and reproducible in-house. At a minimum State GIS personnel <br />will be invited by the contractor to participate in every monthly progress meeting where these <br />task activities are discussed or reviewed. <br />Objective: <br />Develop aGIS-based data management interface that includes standardized command-driven <br />GIS procedures to automate the development of the following required input to StateMod, <br />StateCU, and the Ground Water model. Existing functionality and interfaces within the ArcGIS <br />software package will be utilized wherever possible. <br />^ aggregate non-key diversion and well only structures for use in StateMod and StateCU <br />applications . <br />^ compute the drainage area and average annual precipitation above a user specified location <br />for the area/precipitation weighted distribution of baseflows in StateMod <br />^ estimate the location(s) where surface return flows accrue to the river for use in StateMod <br />applications <br />^ assign climate station weights for key and aggregated structures based on the location of <br />irrigated acreage for StateCU applications <br />^ assign soil moisture available water content to key and aggregated structures based on the <br />location of irrigated acreage for the StateCU applications <br />° distribute precipitation recharge based on land classification and climate station weights <br />Exhibit A-1Page 8 <br />i <br />