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<br />Ob.tructlonmeansanydam,wall,wharf,embilnkmenl,l"vee,dlke,pile,
<br />abutment, projection, excavation, Channel rectification, bridge, conduit, culvert.
<br />building, wire, fence, rock, gravel,refuse, fIll, structure or matter in, along.
<br />"cross. or projecting into any channel, watercour.e, or regulatory flood hazard
<br />area which rr,ay Impede, reurdorchange the direction of the flow of water, either
<br />In It,eTfor by catching or collectlngdebri, carried by such water, or that is
<br />placed where the flow of the water might carry the same downstream to the damage
<br />of lIfe or property. An artificial obstruction shall mean any obstruction which
<br />i,notanatu'..! obstruction. A natural obstruction shall mean any rock, tree,
<br />gravel,orothermatter that has been located bya non-human cause.
<br />
<br />Reach means a longitudinal segmentofa stream or river. Areachwil\
<br />gcnar~include the segment of the flood hazard area where flood heights are
<br />influenced by " man.made or natural obstruction. In an urban ared, the segment
<br />of a stream or river between two con,ecutive bridge crossings would typically
<br />constitute a reach.
<br />
<br />Stream means any natural channel ar depression through whiCh water flows
<br />either continuously, Intermittently or periodkally, Including any artificiai
<br />modification of the natural channel or depression.
<br />
<br />Watershed ~eans the contributing drainage area above" specified point on a
<br />stream or basin.
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<br />REFERWCES
<br />
<br />L
<br />
<br />Colorado Department of Highways, Topoqraphic Mapping of the
<br />fork VJlley by Air Photo SlJr'lcys, Grand Junction, ColoradO
<br />ColoroJdoGeoloqlcal Survey Departfrlent of NatlJral Resources and Colo-
<br />rad" Olvl,i"n of Planning, 1974. RoaringForkandCrystaIV"lleys-
<br />AnenvironrncntalandEngineeringGeologyStudy, Eagle,Garfleld,
<br />Gunn Ison and PI tkln Count I~s, c.olorddo. Envi ronm.ental Geology No.8.
<br />
<br />Roaring
<br />1973.
<br />
<br />7.
<br />
<br />3.
<br />
<br />Co lor ~ do Wale r Conse rva t I on Boa rd, Co lor ado Depa rtmen t 0 f r~a t u r a I
<br />Re,ource"1976. Manual for Estimating Flood Characteristics of
<br />f.latural-FlowStreamslnColorado. Manualllo. 1.
<br />
<br /><.
<br />
<br />Colorado Water Conservation Board and U.S. OepartrnentofAgrielJl ture,
<br />M;,ly, 1965. >iaterand Related Land Resources Colorado River Basin in
<br />Colorado. Ecanomic Research Service - Forest Service - Soil Conserva-
<br />tlonService, Oenver, Colorado
<br />
<br />5.
<br />
<br />U.S. DepartnlentoftheArmy. Corp,ofEngineers,SoJcrameoto, Cillifornla
<br />June 1973, FloodPI..in Information, Roaring Fork River and Castle and
<br />Hunter Creek" Aspen, ColoradO.
<br />
<br />6.
<br />
<br />U.S. Departmcnt of the Army Corps of Engioeers, HydroiogicEng;neeri ng
<br />Center, Da'{isCJlifornla, Computer Progr"m7Z3-x6-L20U"HEC-2 liater
<br />SlJrfaceProflles, 1973.
<br />
<br />7.
<br />
<br />Cllmatoloqical Data - 1975 Colorado Sunmary, U.S. Departrocnt of Comnerce,
<br />National Occanic and Atmospheric Ad~inistratlve onvironmcntdl Data Service.
<br />
<br />8. U. S. Geological Survey, 197~. I-Iater Resources Data for Colorado.
<br />P~rt I. S',Jdoce '~ater Records.
<br />
<br />9
<br />
<br />U.S. Geo]o~icill Survey, 1964. Magnl tude i1nd Frequency of Floods in
<br />the United'SUtes. Part 9. Colorado River a..sin. liater Supply Pilper
<br />1683. United States Government Printing Office, Washington, D.C.
<br />
<br />u.S. Geological Swrvey.1964. Compilations of Records af SlJrface liaters
<br />of tl'reunlteJStates,Dctol>er 195D to Septe,nber 1960. Part 3. C"I"',1dQ
<br />River Ba,in. \>Iater-SupplyP"per 1733. United State, Gov"rnnent Printing
<br />Office, W~shington, O.C.
<br />
<br />U,S. Geoloqic~l Survey, 1%4. CQinpilation of "eco,-ds of Surface Waters
<br />of the Un I ted States thro"gn Scpte",ber 19iQ.. P~rt 9. Colorado Ri ver
<br />S-as;n. \.later Supply Paper 1313. United States Govern1l'ent Printing
<br />Offlcc,'..'a,hingtoo.D.r:.
<br />
<br />12,
<br />
<br />\<lei ghl-~,cldu<;I,I; n Enqin"crs,
<br />Qu~1 i tv Manage"",nt. PI un for
<br />
<br />I~(_. fldY 197~. ROM inq F(,,~
<br />tne Colo. Dept. of Health.
<br />
<br />RI ve r S~sin Wilter
<br />--~-
<br />
<br />;,.
<br />
<br />T"~1ln iCdl Ad~endun" ,"C I ud ,n9 ~y<lrolo'l" F, c I d Survey r"'t~,. JrlU rlyurdul Ic
<br />Inforr.lt ion (BJckw~ter Computer Proqram InplJt and O\Jt~lJt) -wr Ight-Mc-
<br />ldughl in Engineer', D"~v,'r. ColordJo.
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