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<br />. <br /> <br />'f <br /> <br />.'f <br /> <br />. <br /> <br />between 50 and 90 percent confidence intervals <br />of the most recent estimates, the situation <br />shall be presented to the Board for resolution. <br /> <br />c. <br /> <br />Hydraulic Analysis <br /> <br />1. Water Surface Profiles. Hydraulic calcula- <br />tions shall be performed to define the water <br />surface profile1' for the ~-, %-, 100-.. gptt <br />~year flood frequencies as developed in the <br />hydrologic analysis. The water surface <br />profiles shall show.-.H- ~.J;.b'lr ~ <br />fEeq~encies eXQ~pt ~wherQ ~ a.~lage <br />~iff9roRee hetween the 18 . sa . Sf ggg ye..ar <br />-flood profilll aaE! the 100-year flood profile o-J. <br />c.-kc..v.ntl ful~ -is lIIss t'h.." 0 2 fllllt. tke 19 S9, 6r <br />J' 509 Y9~r flnnn profi19 Reed Bet Be sa8WR if it <br />would Im~~vye clarity. <br /> <br />2. Floodplain Boundaries. Flooded area maps <br />shall show the floodplain boundaries of the <br />100- <<Hi S99 year floodjl', IIXG9pt '/Rgre tlle <br />fiOQ year flseupliiR 119uRd.ary is ~eliecally tae <br />~S~1Xteo is tR9 100 yoar fleed bOliR~aEY. SYEJR as <br />ia a vtgep m9YRtaiR eaaY9R. the ~gg Y9ir <br />.41oaa1l'1aih Reed Bat be 8S9WR if i t tJQ'11~ <br />ilApre...8 elAxit). Whe.re tl;t9 ~nn yo;ar bOYRSary <br />~yton~c beY9RQ the limitB Qf the ptiblibLSa <br />flggded ace.) map. ~ gn1".o. Otl t1l9 ltu.p ton t'h;af" <br />eff~ct will b~ 5nrr:G:~uL. <br /> <br />3. Methodoloqy. Detailed floodplain informa- <br />tion shall be based on the following methods, <br />or any other method approved by the Board, as <br />appropriate: <br /> <br />a. Step-Backwater Method. Flood water <br />surface profiles may be calculated by the <br />standard step method employing the <br />Bernoulli energy equation with energy <br />losses due to friction evaluated with the <br />Manning equation and other losses <br />evaluated by shock loss equations. <br /> <br />The following step-backwater <br />ogies, and any other methods <br />the Board, are acceptable: <br /> <br />methodol- <br />approved by <br /> <br />1) Hand calculations. <br /> <br />e <br />