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refuse, fill, structure or matter in, along, across, or pro- jecting i~to any channel, watercourse, or regulatory flood hazard area which mdY impede, rBtard or change the direction of the flow of water either in itself or by catching or collecting debris carried by such water, or that is placed where the flow of the water might carry the same downstream to the damage of life or pro?erty. An artificial obstruction Shall mean any obstruction which is not a natural obstruct~on. A natural obstruction shall mean any rock, tree, gravel, or other matter that has been located by a non-human cause. BIBLIUGHAPHY 1. United States Department of Interior - Geological Survey Water Supply Paper 997, Follansbee and Sawyer, Floods in Colorado, 1948. Reach means a longitudinal segment of a stream or river. A reach wlll generally include the segment of the flood hazard area where flood heights are influenced by a man-made or natural ob- struction. In an urban area, the segment of a stream or river between two consecutive bridge crossings would typically con- stitute a reach. 2. United States Department of Intarior - Geological Survey Water Supply Paper 1850-B, Floods of June, 1965 in the South Platte River Basin, Colorado, 1969. 3. HEC-2 Water Surface Profiles Computer Program, U. S. Army Corps of Engineers, Hydrologic EngineBring Center, Davis California. Reference Point - A numbered point identifying a specific locatlon for correlating the data shown in various forms through- out the report. 4. "Manual for Estimating Flood Characteristics of Natural- FlOW Streams in Colorado", Jerald F. McCain and Robert D. Jarrett, U. S. Geological Survey, 1975. Stream - Any natural channel or depression through which water flOWS either continuously, intermittently or periodically, including any artificial modification of the natural channel or depression. I i i , , -17- -18-