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51. rates of withdrawal during maximum months may he considerably in excess of this figure. Based on the records of the Las Vegas Land and Water Company, it is estimated that the maximum sustained rate of withdrawal during 1948 reached approximately 53,000 acre-feet per year, or 47.2 MOD. This is estimated as the sustained rate of withdrawal for the month of July 1948. Peak dally rates and peak hourly rates may have exceeded even this figure. However, since the annual rate of withdrawal from the artesian basin for 1948 was at least the safe capacity of the basin, the peak monthly rate of 53,000 acre-feet per year (47.2 MOD), must be considered the maximum safe sustained rate. * 8.2 Lake Mead - Water from Lake Mead is the only other source of supply available to Las Vegas Valley. At the present time, the maximum withdrawal from this source is limited to 300,000 acre-feet per year (268.0 MOD). Lake Mead water is available to the Henderson area through the facilities of the Basic Magnesium Plant. The firm capacity of the present supply facilities is limited by the installed pumping equipment. With one booster pumping unit out of service, the capacity of the system is 31.8 MOD, or about 35,000 acre-feet per year. A balance of about 265,000 acre-feet per year (237.0 MOD), is therefore available to the Las Vegas Valley from Lake Mead.
