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• subirrigation Investigation. The terraces adjacent to <br />Rapid Creek were evaluated for vegetative communities that would <br />suggest that subirrigation is occurring. The Tl terrace is <br />obviously subirrigated and is dominated by willows (Salix <br />spp), although no agriculturally significant species were found <br />on this portion of the valley. <br />The TZ terrace associated with Rapid Creek was observed to <br />have cottonwood (Populus spp), greasewood (Sarcobatus <br />vermiculatus), willow (Salix spp) and robust, big sage <br />(Artemesia tridentata) plants. Each of these species <br />indicate that shallow groundwater is available; however, these <br />plants are very deep rooting and there are no plants that <br />indicate subirrigation may be available to agriculturally <br />• important species, that generally have shallow rooting systems. <br />Additional information suggesting the TZ terrace is not <br />subirrigated to agriculturally significant species is the fact <br />that two agricultural operations (the Nash pasture and the <br />Benentendi orchard) require irrigation on the TZ terrace. <br />The T3 terrace did not have any plants indicating <br />subirrigation although this landform was generally in a disturbed <br />state. The native vegetation is dominated by big sage brush <br />(Artemesia tridentata) and blue bunch wheatgrass (AgropYron <br />spicatum) with several annual weeds also present. These <br />species do not indicate that subirrigation is occurring on this <br />Landform. The presence of an abandoned orchard where trees died <br />n <br />U <br />5 <br />