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large canals, ditches, drains and other features that have been digitized from USGS 1:24,000 <br />scale maps to identify preliminary irrigation service areas. <br />Using GIS analysis and interpretations, the Contractor will prepare a series of base maps <br />showing the alignment of canals and ditches and preliminary irrigation service areas. With an <br />anticipated 120 maps, the Contractor will make initial contact with Division 1 engineers and <br />water commissioners in each water district and discuss overall water use and management, <br />and obtain names and contacts of key water users such as company presidents, supervisors <br />and/or ditch riders familiar with specific ditch systems. The anticipated level of effort from <br />water commissioners and Division 1 personnel for this subtask is shown in Table 3. <br />91.3 Mapping and Irrigation Service Areas and Verifying Irrigated Field Boundaries, Crop <br />Types with Water Users. Preliminary maps described in Tasks 91.1 and 91.2 above will be <br />used as the basis for mapping of service areas for both surface water and groundwater <br />irrigation. It is stressed that the water commissioners and water users will not be relied upon <br />to actually conduct the mapping, but their input will be essential in preparing the interim and <br />final work products. The anticipated time required in meetings and discussions from each <br />water commissioner is shown in Table 3. The Contractor will make contact with each water <br />user associated with the diversion structures and will have prepared in advance draft maps <br />with specific features to include the following: <br />• Digitized irrigated parcel polygons overlaid on USGS DRGs <br />• Irrigation ditch structure IDs tied to each polygon <br />• Legend of ditch ID and corresponding ditch name <br />• Points showing headgate locations where available <br />• Crop type for the irrigated acreage polygons <br />The Contractor will make advanced contact with each of the water users, explaining the <br />purpose and objectives of the project, and soliciting their support. The Contractor will visit <br />offices of all the large irrigation ditch companies (anticipated are 54 structures diverting <br />more than 10,000 af), and approximately two thirds of the smaller companies. The Contractor <br />will consult with them regarding their surface water irrigation systems, and groundwater use <br />and management. The users will be presented with preliminary maps of their systems and <br />requested to review irrigation parcel boundaries, crop type mapping, well locations and, <br />especially, irrigation service areas. For these activities, the Contractor will go over the <br />preliminary mapping and discuss the systems in detail. Maps and resources of the water users <br />will be used extensively in revising the preliminary maps and resolving errors. <br />Based on findings from consultation with water users and water commissioners, the <br />Contractor will revise maps of field boundaries, well locations, crop types and irrigation <br />service areas. <br />91.4 Review, Revision and Final Mapping. After preparing final draft results, described in <br />Task 91.3 above, the Contractor will engage water users, water commissioners, and water <br />conservancy districts in a presentation and review of the products. This final review will be <br />conducted during a full two-day workshop in each water district and will be held at a central <br />location in the district. Water commissioners will be requested to participate, as shown in <br />Table 3, for each of the two days in their respective district. All base maps, draft, and final <br />products and data will be available for the entire district. Water users and water districts will <br />C:IDocuments and SettingslckFlMy DocumentslSection DISPDSSISpatia/.doc ~ 0 <br />