. Water Supply and Irrigation Papers of the United States Geological Survey . ncountered; at 435 feet iron pyrites was met; and at 445 feeta vein of fine liquid asphaltum, which rose 45 feet in the well. At456 feet a line petroleum oil was struck; at 490 feet a substratum ofclear fresh water, which rose to within 46 feet of the surface of theground; at 500 feet a strong current of natural gas; at 525 feet ahard sandstone; at 540 feet a very hard white sandstone; at 550 feetanother stream of water that rose within 35 feet of the top. The wellstopped at 659 feet in hard, white rock. SEWAGE FARM.
. Water Supply and Irrigation Papers of the United States Geological Survey . ncountered; at 435 feet iron pyrites was met; and at 445 feeta vein of fine liquid asphaltum, which rose 45 feet in the well. At456 feet a line petroleum oil was struck; at 490 feet a substratum ofclear fresh water, which rose to within 46 feet of the surface of theground; at 500 feet a strong current of natural gas; at 525 feet ahard sandstone; at 540 feet a very hard white sandstone; at 550 feetanother stream of water that rose within 35 feet of the top. The wellstopped at 659 feet in hard, white rock. SEWAGE FARM. The sewage of the city of San Antonio is conducted about 4 milessouthwest of the city and there utilized for irrigating purposes. Earlyin 1897 R. W. Hamilton & Co. made a contract with the city wherebythe firm, in consideration of an annual payment of $1,000 to the city,was to receive all the sewage and the use of a tract of 350 acres ofland. The company had to grub the land, erect houses, constructditches, etc., before they could realize any income from their \ _^ Fig. 15.—Cross section of sewer-farm ditch at San Antonio. The sewage is delivered in the form of a half invert 44 inches indiameter, and to provide for an increased flow a dyke is constructedon each side of the invert, converting the whole into a canal thebottom of which is formed by the invert. (See fig. 15.) Three hun-dred and fifty acres are irrigated on what is known as the sewer farmproper, and the company has rented 150 acres from an adjoiningfarm, making in all 500 acres irrigated in 1901. In addition to this,about 3£ miles from the city the pipe line lias been tapped and 50acres are irrigated from the lateral. The flow is second-feet,and 1,200 acres could readily be irrigated from it. At present thesurplus is allowed to waste. In September, 1901, the city leased the sewer farm and all of thesewage to R. II. Russel, J. A. Simmons, and others for a term of ninety-nine years. The lessees are t
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