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by the lOO_year flood boundary will be designated" flood plain area and ~ay be regulated accordingly by the local oHicials. GLOSSARY Flood Elevatlon~ Basin. Of'tfle l.nenclosed earth. Or partly enclosed water area Or depression on the surface FLood tres~ elevations for ~he 10-, 53_, 100-, and 500_year floods ~ay be found info<.1rseparatelocationsinthisrepott. !h"floodfrequency_elevationa<lddls_ charge data table {Table 2) lists these ele"atlons at selected reference potnts. Flooded Area Plates 3 thru 19 and 22 thru 41 give the plan view of the flooded area on a contOur base map, and the high-water elevations for the 100_ and lOO-year (loods canbc interpolated from this. FloodProfllePlates 15 thru 61 sho..' the streambed elevation a~d the htgh-water elevations for all four frequency floods. Also, cross section plates 42 thru 44 show a graphical represenracio~ of the high_water elevstion~ dL typic~l vsll~y cro~~ section~ throughout the study reach. OOsi!l;nated Flood Plain. T~c area designated as a flood plain by official action of the Town Council of Wray, Colorado, with the prior concurrence of the Color~do Water Conservation Board. Fi!ty-YearFlood. A flood having an..""rage frequency of occurrence on the order of once in 50 years although the flood may occur 1n any year or ev en in succO!ssiveyears. Uisbasedonstatisticalanalysesofrainfallandrunoff characteristics 1n the gener~l region of the watershed. Five-Hundr~d-Year Flocd. A flood having an average frequency of occunence on the order of once in 500 ye~r6 although the flood may occur in any year or even in successive years. It is h",sedon ",tattsticalanalyses of stteamflo"t"ecords available for the watershed and analyse$ of ~ainfall and runoff characteristics 1n the general reg10n of the watershed. The Flood Profiles may be used in areas where controv~rsy arises over the 100_ and SOD-year flood boundaries on the }~oeded Area Plates. Since the Flood Profile Plates give the elevations and di~tance or stationing from a kr.o..n point, t~e high_ water elevations can be surveyed on the ground to alleviate any discrepancies on the ha~e raap. Flood. An overflow of lands not n~rmally covered by water. Floods have two essential characteristics; the inundation of land is temporary and the land is adjacent to nnd inundated by overflow from a river or stream or an ocean, lake, Or other body of standing water. :'orwally" "flood" h cOlls1der,,-d as any te.mporary ris.. in str"amtlo"or stage, but not the ponding of ~urface water, that results in signific~t adverse e.ff,,-,,~s tll th.e vicini~y. Adve.rse affects may include d>lll:lages fr"", ove.rflow of land areas, tcmrorar/ back~ater effects in sewers and local drainage chann~ls, creationofllnsa"Uarycond:itionsClrotherunfavorables:1tuationsbydepositt6n ofOlate.rialsinstraamchannelsduringfloodree",",sions,rise.ofgroundwat..r coincident with increased stTcamflo~, and other problems. Flood Crest. The maximum stage or elevation reaeh@d by the waters of a fl~od at a given loca~ion. Flood Frequency. The average frequency, statistically determin~d, (or which a specific floodflow..ag'litudemaybe equaUedor exceeded. (FrequenCy,e."presged as an oCeurr~lce wtthin a specified number of years, is the equival~nt of !~~~!_ rence interval ~hich is the averag~ time interval between acrual occurrences ';;:-;:-riood-;;;;;nt of a given or greater magnitude of U"'~.) Flood Pea~. The ma~1mum 1n~rantaneo<.1s discharge. of a floed at s given locat1on. It u5ually OCCU,S at or near thet1meof the f1=d Crsst. flood Plain. The ,elath'''ly flat area 0, lowlands adjoining rh~ channel of a ;;at<:rto"rlieoroce"",lake,OI'..:>therhodyo[standing""'e<, ~ay be covered by floodwater. ,iv"r, ~trca".., or which has h~en 0< " "