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<br />: <br /> <br />." <br /> <br />. <br /> <br />The fOllowing procedure ean be used to account fo~ the !lydrologic aspects <br />of a split flow probl.. <br /> <br />1. Make an initial RBC-2 run which redue.. the split flOlfS all the way <br /> <br /> <br />CIownstream. <br /> <br /> <br />2. Alter the bydroloqie model (RIC-I), at the split flow reach, to reflect <br /> <br /> <br />the lost flow an" execute it again. Analvze the effect tllat the split <br /> <br /> <br />flOlfS had on the peak discharges downstream frOlll the split flow reaeh. <br /> <br /> <br />3. If the assumption of redueing the lost flow is Yali~, then no further <br /> <br /> <br />analysis are needed. If the lost flow is only partially effective <br /> <br /> <br />downstrellll, then the lost flows should be returned further downstre_. <br /> <br /> <br />'!'his can be aCCOllll'lished by modifying the RBC-2 discharge ends to <br /> <br /> <br />reflect the expected reduetions downstream frQl'l the split flow reaeh and ( <br /> <br /> <br />returning the s~lit flows back into the model. <br /> <br /> <br />4. An RBC-2 run should he made and steps 2 and 3 repeated until an <br /> <br /> <br />acceptable solution is aehieved. <br /> <br />'!'his procedure is appliCable for simple split flow problems which <br /> <br /> <br />do not IIaye more than three or four separate split flow reaches. For <br /> <br /> <br />the _re comolicated split flow problem, an unsteady state Drogr_ <br /> <br />should be used. The DMOPER (Dynamie Wave Operational Model) proqr_ <br /> <br /> <br />developed by the National Weather Service (reference 8) is a one <br /> <br /> <br />diaension unsteady state proqrlllll that can be used to IIOlve the split <br /> <br /> <br />flow proble. <br /> <br />C' <br /> <br />18 <br />