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<br />~ <br /> <br />.) <br /> <br />.) <br /> <br />-I; 1988 THE PUBLIC RECORD CORPORATION <br />J\LL RIGHTS RESERVED <br /> <br /> <br />lICRI,I.88 <br /> <br />Page 13 <br /> <br />a. Step-Backwater Het~oc. Flood ~ater ,urfac~ profiles <br />may be calculated by t~e standard stpp met~od employing <br />the Bernoulli energy equation with energy losses due to <br />friction evaluated with the Mannino eouation and other <br />losses evaluated by shock loss equationi. <br /> <br />b. Alternative Methods. An alternative hydraul ic <br />methodology may be a.ccepted ny the Board provided it <br />has been recommended for general U5e by a governmental <br />agency or notable scientific body, is well documented <br />and.is available to the genoral user, In the case of a <br />computer program, documentation shall include a <br />published user's manual and a programmer's manual. <br /> <br />4. <br /> <br />Floodelain Oelineat<on Procedures. <br />boundaries shall be delineated <br />methods: <br /> <br />The floodplain <br />by one of the following <br /> <br />a. Flood Contour Method. A referencE line shall be <br />shown down. the center of the low flow channel on the <br />work maps for all streams studied by detailed methods. <br />Flood contours, derived from the water surface profile <br />and corresponding to the maP contours, shall be used to <br />define the boundaries of the 100-year floodplain on the <br />work maps. The flood contours shall have a vertical <br />interval equal to the contour interval of the work map <br />if al the average slope of 'the water surface profile <br />between cross sections is flatter than one to <br />one-hundred, or bl the width of the floodplain is <br />~reater than 200 feet, or cl there are, in the judgment <br />of the engineer, unusual topographic features. <br />Alternate flood contours or index flood contours may be <br />used in lieu of the above flood contour interval if the <br />slope of the water.surfac~ profile, in combination with <br />the work map contour interval and scale, would result <br />.in an average horizontal spacing between flood contours <br />of lesl than 1 inch. A copy of the work map shall be <br />prOVided to the Board for review by the staff prior to <br />designation and.approval under this rule. <br /> <br />b. MaD Contour Method. A reference .line shall be shown <br />down the center of the low flow channel On the base map <br />for all streams studied by detailed methods. For the <br />selected channel and floodplain cross sections, the <br />100-year flood water surface elevations and floodplain <br /> <br />THE CODE OF COLORADO REGULATIONS <br /> <br />2 CCR 408-1 <br />