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<br />• Lastly, neither of the drainages within the study area exhibits geomorphic activity. <br />There is no evidence of significant variable flow in the hydrologic condition. There is <br />no evidence of scour or deposition in the channel. Channels are well vegetated with <br />old and established vegetation, indicating long periods of stable growth conditions. <br />The lack of cottonwood seedlings and saplings is further indication of the lack of <br />geomorphic activity, since this species is dependent on flooding, erosion and deposition <br />for reseeding. <br />CONCLUSION AND SUMMARY <br />This investigator deduces that a riparian community probably existed historically in <br />these drainages, but was eliminated by the isolation of theses drainages by significant <br />linear construction to the south (railroad, highway, and airport facilities). Construction <br />of significant linear facilities which transected the upstream flows of these drainages <br />effectively removed the forces which established and maintained the riparian areas and <br />communities. At this temporal point, riparian communities, as defined and conceived, <br />are not present in this location. <br />Based on a field investigation of Spring Creek and the unnamed drainage traversing the <br />Carol Ann Pit site, and analysis of the definitions of riparian researchers and regulatory <br />agencies, it was concluded that Spring Creek and the unnamed drainage are not riparian <br />• areas. <br />• <br />-7- <br />