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<br />. <br />'. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br /> <br />19 <br /> <br />4. Construction of new conduits <br />5. Construction of new lined channels <br /> <br />6. Levees <br />7. Zoning only with an information program <br />8. Removal of structures from floodplain <br />9. Warning system <br />10. Flood proofing <br /> <br />There are 36 reaches and 10 classes of alternatives. Each <br />alternative can be put in at many design levels (2, 10, 100 year, <br />etc.). If four levels are considered, there is a theoretical <br />maximum number of 410 = 1,048,576 alternatives for each reach. <br />This large number of combinations illustrates the need to screen <br />alternatives for the overall project. <br />A more reasonable procedure is to identify the most promising <br />alternatives for each reach or group of reaches taken together. In <br />that manner, the number of alternatives can be managed much better. <br />Table 11-3 gives a list of the reaches grouped together for this <br />purpose. A total of six likely dam sites have been identified and <br />the corresponding reaches are labeled accordingly, The number of <br />Decision Units has been reduced to 25 and many call for no measures <br />other than zoning since they are presently unoccupied. <br />The formulation of alternatives may now be reduced to a fairly <br />neat package consisting of various combinations of measures for the <br />different Decision Units. <br />To further reduce the Decision Units to a manageable number, <br />they are divided into those that require little action because <br />they are substantially unoccupied, those where possible dam sites <br />