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<br />Floodplain <br /> <br />Flood Profile <br /> <br />FloodSta.o:e <br /> <br />Freeboard <br /> <br />Left Bank <br /> <br />LOK-Pearson Type III <br />Distribution <br /> <br />Meander <br /> <br />Obst...uction <br /> <br />Peak Discha....'!e <br /> <br />Precipitation <br /> <br />An a...e. in and adjacent to a st...eam which ia subject <br />to flooding aa a result of the occurrence of a 1% Chance <br />Flood.' Thua itia aoadverse topaat, current, or fore- <br />seeable conatruction Or land use aa to constitute. <br />significant hazard to pub1i<: health and safety or to <br />prope...ty. <br /> <br />A graph showing the relationship of water surface <br />elevation to location, the latter generally expressed <br />as a distance above the mouth for a stream of water <br />flowing in an open channel. It is generally drawn to <br />show the surface elevation for the crest of a specific <br />flood, but may be prepared for the conditions at a <br />given time Or stage. <br /> <br />The stage Or elevation at which overflow of the natural <br />banks of a strea~ or body of water begins in the reach <br />or area in which the elevation is measured. <br /> <br />The distance between the nOJ:"mal or design water level <br />and the top of a dike Or conduit which is left to allow <br />for wave action and floating debris. <br /> <br />The bank on the left side of a river, stream, or water <br />COurSe as the observer looks downstream. <br /> <br />A statistical dist...ibution used in flood frequency <br />analysia; which is described by three parameters: (I) <br />the mean, (2)theatandarddeviation. (J)theco"ffi- <br />eient of skewness of the logarithma; of the sample <br />obaervationa. <br />The winding of a stream channel. <br /> <br />Any natural or manmade object existing in, along, across. <br />or projecting into any channel, watet course, or regula- <br />tory flood naeard area which may impede, retard. or <br />change the depth 0... the direction of flow of water either <br />by itself or by catcning or collecting debris carried <br />by such water, Or that is placed where the flow of the <br />water might carry the Same downstream to the damage of <br />life or property. <br /> <br />The largest value of streamflow attained by a flood, <br />uaually reported in unita of cuhic feet per second (cfs). <br /> <br />The discha...ge of water, in liguid or solid state, out <br />Qf the atlll<>!lphere, geneutly upon al!lnd 00 ....cer !lUr- <br />facc. rrecipitationinclUdes rainfall,snow, hail,and <br />slcet, and is therefore a ~r" general term th..n rainfall. <br /> <br />-97- <br /> <br />Probability <br /> <br />Reach <br /> <br />Recurrence Interval <br /> <br />Reference Point <br /> <br />Residual Damagea <br /> <br />Retention <br /> <br />Riprap <br /> <br />Ri!l;htBank <br /> <br />Runoff <br /> <br />Side Slope <br /> <br />Skewness <br /> <br />Stre"", <br /> <br />Watershed <br /> <br />i <br />I <br />I <br /> <br />The annual chance of occurrence of specific hydrOlogic <br />events, such as rainfall over a specified area 0... peak <br />diach.....ge at a spe<:ified location. It is expresaed in <br />percent, e.g., 5% representing one chance in 20 of the <br />event oc<:urring in any year Ot an average recurrence <br />of once in twenty years. <br /> <br />A segment of the rive... defined between two specified <br />points. <br /> <br />The average interval of time, in years, within which <br />a given flood will be exceeded once. <br /> <br />A numbered point identifying a specific location for <br />co...relsting the data shown in various forms through- <br />out the report. <br /> <br />Damages resulting frOm peak flowa which are greater <br />than the deaign flows, and for which the drainage <br />improvementa designed to handle apecific magnitude <br />flows cannot protect. <br /> <br />The prevention of runoff from entering the atorm or <br />combined Sewer aystem by storing it On a surface area <br />or in a atorage basin. <br /> <br />Broken rocks placed on earth surfaces to prevent erosion <br />from the action of flowing water. <br /> <br />The bank on the right side of a river, stream, or water <br />course, looking downatream. <br /> <br />The quantity of rainrall which flows Over the surface <br />to enter the stream aa diacharge volume. The difference <br />in quantity between rainfall and runoff represents losses <br />toinfiltr.1tiO"""u,i"t"<"epLLo,,. <br /> <br />The slope of the banks of a channel, d_. oretllbankment. <br />The steepness of rhe bank is usually specified using a <br />ratio of the length of horieontal run per one foot of <br />ve...tical riae. <br /> <br />Anuolericalmeasureorindexofasymmetryofafrequency <br />distribution. From a practical standpoint. the teem <br />indicates the position 0... negative curvature of a floodl <br />frequency relation. <br /> <br />Any "..tu...al channel or depression through which water <br />flows either continuously, intermittently or periodi- <br />tally. including ~ny artificial modification of the <br />natural channel or depres~ion. <br /> <br />fhe drainage area aituated above a specified point on <br />a stream inclUding the a...ea drained by tributary streams <br />which enter the main atream above this poi.nt. <br /> <br />98- <br />