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<br />e <br /> <br />The preliminary analysis described above establishes a starting point for the <br />selection of design alternatives. This starting point may include a bridge <br />length, an embankment height, and auxiliary gpenings and segur proteetign <br />schemes. Other alternatives are generated by varying the control variables <br />above and below the starting point. Auxiliary opening schemes may be varied <br />in combinations with the main channel structures. <br /> <br />. <br /> <br />Most often the selection process will necessarily involve arbitrary control <br />criteria (such as the criteria for providing scour protection). Because of <br />. this, the designer should, after selecting the LTEC design, review the <br />criteria to determine if other design alternatives should be investigated. <br /> <br />TABLE 4.1 Design Alternatives for <br />a Two Variable Analysis <br /> <br />BRIDGE/AUXILIARY <br />OPENING COMBINATION EHl <br /> <br />EMBANKMENT HEIGHT <br />EH2 EH3 - - - - - - - EHm <br /> <br />e <br /> <br />BLl & XOk Al ,1 <br /> <br />BLl & XOk+ 1 <br />BL2 & XOk <br />BL2 & XOk+l - <br /> <br />Al,2 Al,3 - -Al,m <br /> <br />BL & XO - - - - - - - - - - - - - - - - - - - - - - A <br />n 0 n,m <br /> <br />, <br /> <br />e <br /> <br />13 <br />