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<br />)0
<br />
<br />Obstruction. Anydam,wal1,wharf,embankment, levee, dike, pi le,abut-
<br />ment, project ion, excavation, channel recti ficat ion, br idge, cand.. it, c~lvert.
<br />building, wire, fence,rock,gravel,refuse, flll, structure or matter ,n,
<br />along. across, or projecting intoanychannel,watercourse:or;egulatory
<br />flood hazard area which may impede, retard or change the d,rectlon of the
<br />flow of wHer, either in Itself or by catching or collecting d~bris carried
<br />by such water, or that is placed where the flow of the water m~g~t_carry
<br />the same downstream to the damage of life or property. An art,f,clal ob-
<br />,tructionlsanyobstructionwhich is not a natural obstruction. A natural
<br />obstruction 1s any rock, tree, gravel, or other matter that has bec~ located
<br />by a non-human cause.
<br />
<br />Reach. A longitudinal segrnent of a stream or river. A reach will
<br />generally InClude the segment of the flood hazard area where flood heights
<br />are influenced by a man-made or niltural obstruction. In an urban area,
<br />the segment of a stream or rlver between two consecutive bridge crossings
<br />would typically constitute a reach.
<br />Stream. Any natural channel or depression through which water flows
<br />either continuously, Intermittently or periodically, Includlnganyartifi-
<br />cial modjflcatlon of the natural channel or depresslon.
<br />
<br />Watershed. Tl1econtrlbutlngdralnaqeareaabovea.pecifledpolnton
<br />a stream or basin.
<br />
<br />>0,
<br />
<br />,.
<br />
<br />REFERENCES
<br />
<br />L
<br />
<br />ColoradO Geological Sur.ey Department of Natural Resources and ColoradO
<br />DivislonofPlannlng, 1974. Roarlnq ForkandCrystaj Valjeys-An
<br />Environmentaj and En Ineerln Geolo Stud Ea Ie Garfield Gunnjson.
<br />and Pitkin Counties, Colorado. Environmental Geology No.
<br />
<br />"
<br />
<br />Colorado Water Conservation Board and U. S. Department of Agriculture,
<br />rlay, 196$. l<IaterandRelated Land Resources Colorado River Basjnin
<br />Colorado. Economic Research SerVice - Forest Service - 5011 Conser-
<br />vationServlce, Denver,Colorado.
<br />
<br />),
<br />
<br />U.S. Department of the Army Corps of Engineers. Basalt, Colorado
<br />Hydrolo'lY, AU9ust. 1976. Internal Offjce Memorandum, Sacramento Distria,
<br />CorpsofEnglneers,Sacra"",nto, California.
<br />
<br />",
<br />
<br />u. S. Department of the Army Corps of Engineers. Computer Program
<br />723-X6-L202A,HEC-2I<1aterSurfaceProflles. HydrologleEngineering
<br />Center,Davls, California, 1973.
<br />
<br />5,
<br />
<br />u. S. Department of the Army Corps of Engineers, Investigation of ,Iood
<br />Problems on Roaring Fork River, Colorado. L.A. District, Corps of
<br />Engineers, Los Angeles, California, 1958.
<br />
<br />6. U. S. Department of Commerce. Climatological Data-1976ColoradoSurtJ'n,Jry.
<br />National Oceanic and Atmospheric Administrative Environmental Data Service.
<br />
<br />7, U. S. Geolo!) ieal Survey. Com j lations of Records of Surface >I"ter~ of
<br />the United St<ltes, October 1950 to SePtember 190, Part9,Co)oradoRi.er
<br />8,,~ in. Water Supply Paper 1733. U. S. Government Print I ng Office,
<br />Washington D.C., 1964. -
<br />
<br />8. U. S. Geolog ical S~rvey. Compi lut Ion of Records of Surface Waters of
<br />the United States through September 19$0, Part 9, COlorado River aasln,
<br />~ater Supply Paper 1313, U. S. Government Printing Office, Washington D.C.,
<br />1954.
<br />
<br />9. '..r ight-McLaughl in Eng inccrs. Floodp lain Informat Ion R~port, Ro,}r i,Cll.
<br />ForkRI.er, Aspen to a".alt, Pitkin Count y,Colorado, prepare dfor
<br />Pitkin County and the Colorado Water Conservation Board, August 1976.
<br />
<br />..rlght-l1cLaughlinEngineers.
<br />Manag"mentPlatl,preparedfor
<br />1974.
<br />
<br />Roaring Fork River aasln Water Qual~_
<br />the Colorado Department of Health, rlay.
<br />
<br />II. Wright-McLaughlin Engineers. TeChnical Addendum, Floodplain Information
<br />Rei><'rt, Roaring Fork & Fry Ingpan Rlvers, Includes hydrology. fl~ Id
<br />,,,rvey notes, .:ond nydruul)c information (backwater computer program
<br />i'wutandoutPur), Denv('r,Colorado, September 1977.
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