450 GEOLOGY OF THE DENVER BASIN. 



5. The Oakes well, on the corner of Curtis and Twelfth streets, illus- 

 trates the method of casing sometimes in use. The well was completed in 

 1884 and is 365 feet deep. Cost, $1.12J per foot. It was cased with a 

 2-inch iron pipe to bed rock, with 1^-inch pipe to 329 feet and with 

 lj-inch pipe for the lower 36 feet. The last was perforated for 30 feet 

 with 30 J-inch holes to the foot, and wrapped with a 60-mesh copper- 

 wire gauze. A seed-bag and cement packing were used. The well was 

 abandoned some time after 1886. 



6. The Eckhart well, near the corner of Fifteenth and Stout streets, 

 was begun in August, 1883, and was completed in seven weeks. It is 397 

 feet deep and is cased nearly to the bottom with 4-inch pipe. It was not 

 sunk in the usual way, but was bored by a hand-machine turned with a 

 lever, the cutting arrangement being composed of steel-bits shaped like the 

 bit of a grooving-plane. The well, including the casing, cost at the rate of 

 $2.50 per foot. The pressure at first was reported at 32 pounds, but it had 

 fallen to 7J when tested a little later on. This well gradually ceased to 

 flow, until it was found necessary to use a hydraulic ram to force the water 

 into a reservoir in the house. The ram ceased to work about April 1, 1884, 

 after which a pump with an 8 or 10 foot rod was used until about December 1, 

 18S5, when this also ceased to work. The decrease in flow is supposed 

 to be due to careless casing and packing. A 4-pound charge of giant 

 powder was exploded in the bottom of this well, with the effect of slightly 

 but not permanently increasing the flow. 



8. The county well, at the court-house, was to have been sunk to a 

 depth of 1,500 feet, but difficulties encountered and the delays caused 

 thereby induced the abandonment of the attempt at 930 feet. Below 650 

 feet, or after passing into the Laramie, the bore showed alternate layers of 

 sand and clays, the latter greatly in excess. The two important flows of the 

 well are the 600-foot and the 910-foot; they are cased separately. The 

 600-foot flow was originally 60,000 gallons per day. In 1886 it had dimin- 

 ished to but little over 2,880 gallons, and in December, 1890, the water 

 was pumped. The 900-foot flow is moderate in size and differs essentially 

 in the quality of its water from the upper flows (vide analyses, p. 461). 

 A curious fact was observed in connection with this flow, namely, that 

 despite the small discharge the pressure was 57 pounds per square inch. 



