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<br />APPENDIX A <br /> <br />Existing Conditions <br />In this report, this refers to the present extent of urbanization <br />1n the Sheep Draw basin. Alao under this conditIon the irrigation <br />canals and the sOIall1tt1gatlond"lllswereaaau",..d to he relllOved. <br />Roadways were assumed to remain In place. <br /> <br />Expected Probability <br />An adjustment for the skewed distribution of the sample error <br />atoundthecru"popul1l.t1on. <br /> <br />GLOSSARY <br /> <br />FlOOd <br />An overOow On bods that are not normally covered by water..n.<;l <br />that can be used by"",n. Floods hs.... t"oeaa"otial Characteristics: <br />the inundation of land is temporary; and the land is adjacent co and <br />inundated by overflow from a river, stream, ocean, lake, or other body <br />of standing water. <br /> <br />Basin Characteristics <br />Characteristics of a watershed chat affect the relationship <br />b~t~co raInfall and r~noff. Charact~~is(lc~ taken fro~ a topographic <br />map ~ight include size s,~ shape of th basIn, overland slopes, strea~ <br />siopes, and the arrangement of tributarIes. Other charscterlstlcs <br />~Ight Include solI and vegetatIon. <br /> <br />Plood Boundaries <br />The outer li~its of the flooded area for a partIcular flood, as <br />Seeo on an serial photograph or s map. The flood ~y be an assumed <br />flOOd of a given discharge or a given chance of occurrence. It may <br />also be drawn for a flood that has already taken place. <br /> <br />Flood Creat <br />The maximum stage or elevatIon reached by the wsters of a flood st <br />a given location. <br /> <br />CoincidentFlo" <br />The water level On a stresm being st~died may be affected by the <br />flolo'onaootherstrea","hlchjoJ,us...iththestudyetrea",. Ana""ump- <br />tloo muat be made of the flolo' occurring In the other stream when the <br />study Stream is delivering its peak dlscharge. <br /> <br />Flood Ha~ard Areas <br />Cenerally refers to thO' area subject to Uo.ods ull to s.....' <br />spec1fIed....gnitude. <br /> <br />Confluence <br />The pOInt "here tlo'o or more streams Join. <br /> <br />NatIonal Flood Insurance Pro~ram <br />1:he Federal Emergency ~nagement Agency (PEMA) haa ident{fied <br />flOOd-prone commun1tieB and administera the National Flood lnauranee <br />Program (~PIP). Com~nities that asree to join the NFIP adopt a1niuum <br />staodsrda to ",Higate flood losscs. In return, the Federal Government <br />makes flOOd insurance available to property ownera at aubsidi~ed ratea. <br />Loen.s or guara"tee8 by Federal agendea fot CoD8tructlonare not <br />available 10 flood hazard areas that are In noo-NFIP flOOd-prone <br />communities. <br /> <br />Cro"sSecUon <br />A ..urveyed Un" that 1& Eenerally perp"ndleulilt to the directlon <br />of th" 8tre8", flow. It Is usc'd to show the topogr"phy of the floo.:l <br />plaln and the ch8nnel. <br /> <br />Deten.~}oo ~torag,,- <br />The amount of rainfall and/or raInfall runoff ~hich Is Intercepted <br />by ditches, ponds, or natural depressions and Is therefore removed from <br />the normal "urface-runoff pattern. <br /> <br />FloodPlain <br />The relativsly flat area or 10"lands adjoining the channel of a <br />r1ver, atresm, "atereoutse, oceao, lske, or other body of standing <br />waterlo'h1chhaa been or ""'y be covered byflood"ater. <br /> <br />Discharge-Probability Relat}onship <br />The chanc"s (s"e "Prob<lbIllty") of floods of dtfferent "'agnit"dc~ <br />"ccurrlng Olt a glv~n l"catlon. 3"".11er rl<lud~ ,He likely to oCcu.. more <br />otten, while grC<lt.H flo("I~ ar" less com""'n. <br /> <br />Flood Profile <br />A graph shOWing the relatio",ship of ...atH surf..e.. "levstlon to <br />locution, the latter g..n"rslly expreased as th" dhtaaceup,.trearnfrom <br />th" ",outh for a stream ot Io'ater Howlng In ,'" op"n channel. .~ flood <br /> <br />H <br /> <br />;'-2 <br />