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& 1 necessary to provide additional supplies of water for the thousands of workmen o casing in hero to build the dan. So a veil was drilled to a depth of 600 feet, and a flow of 3| million gallons of water per day eeoured front this well* how, the two springs and the Big Well supplied- the city for a number of years, until 1942 when the second influx of • orkmen commenced, These were needed in order to build the large Basis Magnesium plant which produced a light strong metal from which airplane parts and incendiary bombs are m&det some 14,000 men were employed on this project, which cost in the neighborhood of $64,000,000* In order to supply all these men with water It was necessary to build a battery of 10 wells from which over 13,000,000 gallons Of water can be produced each day. An •Artesian* well means one from which the water flows naturally, without assistance from mankind* This is made possible by the water entering an impervious strata from a point high In the mountains, and being confined in this channel until it is ftapped* by a well. The water then rises until it attains an outlet and thus we have an artesian flow. However, as more and more wells are drilled, this has a tendency to decrease the flow, ’and in such instances a pump is Installed in the well to assist the water in rising to the top* The temperature here in the desert sometimes reaches 120 degrees in yuly and August, and, of course, a great deal more water is required than in moist, cool oltmatee. The per capita consumption here in those months has reached 640 gallons dallly, which is about four times the national average.^ Trusting you will be able to gain some interest for your class from the above information, 1 am Very truly yours, - 2 ~ General Manager