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<br />" <br />, <br /> <br />above mout~ for a stream of water flOw; nq in Il~ aoen channel, <br />It is generally drawn to Show surfaco elevation for t~e crest of <br />II speCi! Ie flood, but 'My be prepared for co<tdltions at II glv<:lo <br />tirneorstage, <br /> <br />ot occur,..""c,, In tMor1er01 once In 10, 'i0, 10'1,01"" "GO years, <br />rBspectivClly, The flood may occur in <my y,,~r. I" is based on <br />statistical analyses of streaMflow recnros ane ~naIY5n~ n' rain- <br />fall IInQ runolt characteristics in the oeneral roo ion of the <br />watershed, <br /> <br />FloodSta<1o <br />The stage or elevation at whiCh overflow 01 tho natural <br />banks of II strell~ or body of water bog ins In the roach or area <br />in whiCh the elevation is mflllsured, <br /> <br />Top at Wat..rw.~y <br />This is tho root of the openine in II stream crossing <br />through which wate,.. flow$ unde,.. ~rmal conditions, It is tho <br />unde~~ide of the deck span - ~omoti"'es ca lied ., low 5t<l6 I'., the <br />roof of a box culvert, o~ tho crown of an arched or circular cui. <br />ve~t . <br /> <br />Head Loss <br /> <br />The effect of obstrucfions, such ~S na~row b~idgo open- <br />Ings or bui Idl ng5, thilt I imit the a~ea rhrough which w~te~ must <br />flow, raising the su~face of the water upstream f~om th~ obstruc- <br />tion, <br /> <br />leHBank <br /> <br />The b~nk On tho left side of J rivQr, stroam, or water <br />courSe lookingdownstrear:1, <br /> <br />Reference Point <br />A numbered point ioontlfylnga sfl<}cific locMlonused <br />lorcorreliltinQthedatashown in various forms throuQhout thA <br /> <br />1 <br /> <br />rep("J~t. <br /> <br />Ri<lhtRi'lnk <br /> <br />The bank On tl1<) right side 01 " ~ ivor, stre~"', o~ water <br />COurSe looking downstream. <br /> <br />10-, ')Q-, I CO~, and 500-Yea~ F iood <br />A llood having" 10, 2, I, or .2 !le"c('nt p~obabll i ty, <br />respeCTively, ot occurrence in any vear or an avor~ge Irequoncy <br /> <br />" <br /> <br />30 <br />