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1 <br />Thus, it appears that, in order to satisfy projected water demand in Southern Nevada, a <br />desalting plant of approximately 30 mgd (1.31 M3 /sec) capacity should be built in Mexico <br />between the years 1999 and 2004 -- based on the scenario and assumptions outlined above. <br />Following completion of this first phase, another capacity increment of 30 mgd (1.31 M3 /sec) <br />�� P P h' <br />would be needed every five to ten years thereafter, depending on which water conservation <br />scenario applies after the turn of the century. <br />For the case where all of the water withdrawn at Lake Mead is used consumptively, i.e. if <br />complete reuse is contemplated. then correspondingly larger desalting plants need to be built <br />in Mexico. In that case, a one on one relationship would exist and for each 50,000 ac -ft <br />(62 x 106 M3) /year diverted at Lake Mead a 50,000 ac -ft (62 x 106 M3) /yr capacity desalting <br />plant would have to be built in Mexico. <br />5.0 ISSUES AND CONSIDERATIONS <br />There are many issues and considerations -- environmental, technical, institutional, legal, <br />political -- that need to be addressed in completing a bi- national project of this magnitude and <br />complexity. These issues will need to be fully addressed to complete this project successfully. <br />Though the scope of this White Paper does not provide for a detailed presentation of all the <br />issues, we have provided a brief discussion of early identifiable issues as a basis for developing <br />the magnitude of the challenges facing this international project. These issues can be <br />identified as being either located in Mexico or the United States, or as extensions of past <br />agreements between the two countries as in the 1944 Mexican Water Treaty. <br />7 Carollo Black & Veatch <br />