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<br />APPENDIX A <br /> <br />ExtorteR Conditions <br />In this report, this refero to the present extent of urbanization <br />In the Sheep Draw basIn. Aloa under thin condition the 1.rl88tloo <br />canal. and the small Irrigation dams were Bosumed to be re~ved. <br />Roadways were aSHamed co remain In place. <br /> <br />Expected Probability <br />An adJuet~nt for the skewed distrlhutlon of the oample error <br />around the true population. <br /> <br />GLOSSARY <br /> <br />Flo(>d <br />An overflow on lands chsc lice not ooc.....l1y covered by water and <br />that canbl! used bYllllln. Floodah.avetvoessontlal,,-hllcacterhtlca, <br />the Inundation of land 10 temporary; and the land Is adjacent to and <br />inundatl!dbyoverflo"fro1ll81:iver,Btteall,ocean, lake, OC othec body <br />of "tanding water. <br /> <br />BasIn Characteriatlca <br />Characteristics of a watershed that affect the relatlonuhip <br />1::et""cn rainfall and runoff. Characte'18t1cs t"ken from a topographic <br />map might include al~e and shape of th, basin, overland slopes, stream <br />slopes, and the arrangement of tributaries. Other characteriatics <br />..Ight Include aotl and vegetation. <br /> <br />Flood Boundar1es <br />The outer I1mit" of the flooded area for. partlcular flood. .s <br />"een on an 8crlal photograph or a map. The flood may be an as"umed <br />fl~d of a given discharge or a given chance of OCcnrrence. It may <br />also be drawn for a flood that haa already taken place. <br /> <br />Flood Crest <br />The ma~i..u.. stage or elevation reached by the waters of a flood at <br />a given locatlon. <br /> <br />Co1ncident Flow <br />The water level 00 IT at ream being studIed may be affected by the <br />flow on another atresm ~ieh joi~a with the study stream. An aasump- <br />tion muat be made of the flow occurrlng in the other stream when the <br />study atre".. 1a delivering ita pesk dlscharee. <br /> <br />Flood Hazard Aress <br />Generallyreferll to the area subject to floods up to aOID" <br />speclf1e<l...gnltude. <br /> <br />Confluence <br />'IhepolntwheretwoorlOOreatrealll.8joln. <br /> <br />lIationall'loodfnsutSnceProgra.. <br />'Ihe Federal EIDergency Manage~ent Agency (FEMA) haa Identified <br />flood-prone cOIDmunitles and admlnister8 the National Flood Inaurance <br />Progra," (NFIP). Communlties that agree to join the XFIP adopt ,"1nlmum <br />8tan<iardstom1t1gatef100dlosse8. In return. the Federal Govern....nt <br />~kea flood tnsursnce available to property Owners at subsidized rates. <br />Loan8 01' guarantees by Federal agenclea for conatructionare not <br />avaIlable In flood ha~ard IIreaa that are In non-NFIF flood-prone <br />cO,"llIUnlties. <br /> <br />CrosaS"ction <br />A 8urveyed lIne ~hat Is generally perpendicular to the dIrectIon <br />oftbe streallflow. It Iaus('d toahowthe topography of the flood <br />plaIn and tile channel. <br /> <br />Detention Storage <br />The amount of rainfall and/or rainfall runoff whIch Is Intercepted <br />by ditches, ponds, 01' natural deprea~lon8 and 18 therefore removed from <br />the norms! surface-runoff pattern. <br /> <br />Flond Plain <br />The relatively flat area Or lowlanda adjoining the channel of a <br />river, strealO, watercourse, ocean, lake. nr other body of Handing <br />"aterwhich hs. becn or may be covered by floedwater. <br /> <br />Dlscharge-Probabil1ty Relationship <br />The chanc",s (see "ProbabUlty") of floods of dIfferent ......gnlt"<I..s <br /><lec'" rl ng ~t a gt ven loeat ion. Smaller floods .,re like iy ~o occur 1lIOre <br />of ten, whll"s,o,lter fl""dsa,eles.co",,"on, <br /> <br />floodProflle <br />A graph ahowb'g Llo.. r"ht1onshlp of wst", surface elcvat10n to <br />loca~ion, the latter gcncrall~ expressed as Lloe dIstance upsLres," froa <br />the O\outlo for a strea.. of wster Howlng In An open channel. A flood <br /> <br />,-, <br /> <br />H <br />