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• was active in reworking the mudflow deposit apparent in this <br />vicinity. The presence of active irrigation practices and the <br />fact that these terraces are related to the Colorado River valley <br />complex indicated these areas should be included in the mapping <br />of valley deposits which meet the geomorphic criteria for AVFS. <br />Flood Irrigation Analysis. The Government Highline Canal <br />and the Orchard Mesa Ditches are the two primary sources of <br />irrigation water utilized on the Colorado River valley in the <br />area investigated for this study (see Map 2.1. Both of these <br />ditches obtain their water directly from the Colorado River. All <br />lands deriving water from the Colorado river are shown on Map 2. <br />A very high percentage of the land between the Government <br />Highline Canal and the Orchard Mesa Ditch is currently irrigated. <br />' • The two high terraces of the Colorado River shown on Maps <br />land 2 at the mouth of Rapid Creek are irrigated with waters <br />taken from Rapid Creek. <br />Subirrigation Investigation. The Colorado River valley <br />bottom was investigated for vegetative communities suggesting <br />that shallow groundwaters are available for Subirrigation. The <br />bars along the river bottom are obviously subirrigated with <br />species such as cottonwood (POpulus spp), willows (Salix spp) <br />and salt cedar (Tamarisk sp) present, although the river bars <br />are not conducive to agricultural activities. <br />• <br />8 <br />