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subirrigated. North of the rail loop, in Section 10, the floodplain terraces are irrigated £or grass hay and alfalfa. The upland benches and hillslopea are generally used £or dryland agriculture and rangeland for livestock grazing and wildlife habitat. Irrigation. The Keammerer and Golder study included a land use and irrigation map (this map is included in the Seneca II-W Mine permit as Exhibit 16-3) that depicts the extent of subirrigation, existing land use and the extent of flood irrigation in alluvial areas along Dry Creek within the study area. The extent of subirrigation was determined on the basis of the vegetation growing on the valley fill and alluvial deposits. In general, the subirrigated areas were defined as those that were currently supporting riparian vegetation or vegetation that was striking different from the surrounding uplands. Areas of existing flood irrigation were evaluated using aerial photographs, field checking and water rights information. The water rights information is included in the Tipton and Kalmbach study (see Attachment 14-2, Water Rights Investigation and Augmentation Plan for Dry Creek and Sage Creek), which mas also done for the Seneca II-W Mine. Irrigation potential was evaluated on the basis of the relative size of the valley floor, topographic considerations, and the availability of water. The lower reach of Dry Creek is much different £rom the headwaters. Once the creek exits Dry Creek canyon, it passes through a broad valley of alluvial materials. The valley supports irrigated agriculture, primarily alfalfa and grass hay. This agriculture area is partly on Dry Creek alluvium, but the fields are flood irrigated with water from J.C. Temple Reservoir #1. Temple Gulch, an un- named ephemeral drainage and Dill Gulch tun together to form the western edge of the agriculture area (sea Exhibit 4-2; the area being described in located in Sections 27 and 26). Dry Creek has been channelized and crosses the center of the agriculture area. The fields on either aide of Dry Creek are flood irrigated £rom the Dry Creek Ditch. The Dry Creek Ditch bends eastward and passes under Routt County Road 53 to irrigate two fields of alfalfa in Section 22 and north of Dry Creek. Water from Dry Creek contributes only a small portion of the water diverted into the Dry Creek Ditch - most of the water is supplied from reservoir flood irrigation systems. Downstream of the irrigated alfalfa fields the land use becomes dryland farming. The dryland acreages start in the northeast corner of Section 22 and northwest corner Section 23. The dryland fields are shown on Exhibit 4-1, Land Use Map - TR-07 14-3.3 Revised 03/06