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..... l\:l 00 ---1 :;~~:? --...0:-.-- Reply: Credit for return flow is based on the amount of Colorado River water returned. If some of the water treated is determined to have originated from the Colorado River, then that portion would be charged against Nevada's credit. The Bureau of Reclamation, State, and local entities are coordinating the final determinations of those flows that will be treated. In addition, the Bureau of Reclamation has applied to the Nevada State Engineer for a permit to consumptively use up to 14,600 acre-ft/yr of water from Las Vegas Wash. 7.. Comment: The entire Colorado River Water Quality Improvement Pro- gram is geared at salt reduction at. Imperial Dam. With the amount of U.S. bucks involved, I would like to have the actual p/m value reduc- tions expected upstream of this point. In other words, what p/m value reduction can we anticipate in the Virgin River or Lake Mead? Will this project change population growth locations? Reply: The effect on the Virgin River is addressed in reply to your first comment. The cumulative effect of upstream units on Lake Mead is addressed in your fourth COmment as noted. Chapter Ill, Section A.lS of the DRAFT EIS stated that no significant changes in the growth pat- terns of the Colorado River Basin are expected. 8. Comment: There seems to be a discrepancy as to the location of the brine evapo:r-ation ponds near Las Vegas Wash. The. U.S. Geological Survey Flood Prone Map shows that approximately half these ponds are prone to a 100-year flood. According to this report, Corps of Engi- neersFlood Prone Maps show this area not in the path of a 100-year flood. There seems to be a contradiction here. ~{;t);; ~: As yet, the U.S. Geological Survey has not'conducted a flood studY in the vicinity of the Wash. The map referred to was prepared by the U.S. Department of Housing and Urban Development in conjunc- tion with the city of Henderson. The city of Henderson is actively engaged in the construction of flood protection facilities within its corporate limits. As such, an extensive dike and drainage channel have been constructed which will effectively divert all floodflows shown on the subject map around the proposed evaporation ponds. In addition, BMI industries have an extensive system of dikes and drains for flood protection which would intercept flows prior to their reach- ing the ponds. The Corps of Engineers study only discusses floods within the Las Vegas Wash Channel. Due to mapping scales, it is difficult to visu- alize the relationship of the ponds to the Corps' projected flood plain. 170