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GLOSSARY OF TERMS 6eadng The hodlootal angular meaSuremenT of a line, in degrees, east or wesT of a north-south reference line. Flood An overflow on lands not normally covered by waTer and that are used or usable by man. Floods have two essential characteristics: The inundatIon of land Is temporary; and the land IS "dJacent to and Inundated by overflo.l from a river or stream or an ocean. lake or other bOdy of standing waTer. Normally a flood Is considered as any temporary rise In stream flow or STage, but not the pondlng of surface water, that results In slgnlflcantadverseeffectslnthevlclnlty.'Adverseeffoctsmay include damages from overflow of land areas, temporary backwater effects In sewers and local drainage channels. creation of unsanitary conditions or other unfa\lOrable sItuaTIons by deposition of materialS In stream channels during flood recessions. rise of ground water coin- cident with Increased sTreClm flow, and other problems. flOOd Crest The mClxlmum stage or elev"tlon re"ched by the waters of a flood lIt a given location. Flood Plain The relatively ftat area or low I"nds adjoining the channel of a river, stream or water course or ocean, take or other body of stand- ing water. whIch has been or may be covered by floodwater. Flood Protlle A graph showIng the relationship of water surface elevation to location, The latter gener"lly expressed as distance ebova mouth for astrellmofwater flowing In an OpBfl channel. IT Is generally drawn toshowsurfaceelevatlonforthecresTofllspec1t1cflOOd,butmay be prepared for conditions at a given time or STage. 10 flood Stage The stage or elevation at which overflow of the natural banks of a stream or body of water begins In the reach or area In which the eleva~ tion Is measured. HeadLess The effect of obstrveTlons, such as narrow bridge opening!' or build- Ings That limit the area Through which water must flow, raising The surface of the Wllter upstream from the obstruction, Intermediate Regional Flood A flood having a one percent probability of occurren(;(l In any year or an average frequency of occurrence In the order of once In 100 years. Thefloodmayoccurlnenyyear.ltlsbasedonstatlstlcalllnalyses of STream flow records Ilnd analyses of rlllnfall llnd runoffcharllcte rlstlcs In the general region of the watershed. Left Bank The benkon The leftsldeofarlver,streamorwatercourse, look- Ing downstream. ReforencePolnt A numbered point identifyIng a specific locatIon for correlating the d~ta ~h~n J~ varlDv~ for~ throughOUT thn reporT. RlghtSanl< The banI< on the righT side of e river, stre~m or water course, looking downstream. StllndClrd Project FlOOd The flood that may be expected from the most severe combInatIon of meteorologl~1 end hydrologIcal condItions That ere considered rOll~onably ch3r3ctorl~tlc of tho geographlclll area in which The draInage basin Is located, excluding extremely rare combinations. "