26 



BULLETIN 71, U. S. DEPARTMENT OF AGRICULTURE. 



ditches the tile lines would need to remove 

 only the ground water, and from the 

 measurements of the ground water profile 

 it would appear that they would easily 

 fulfill this purpose. When the reservoir 

 canal is deepened these lines of tile could 

 be given sufficient fall to insure satisfac- 

 tory operation. The cost of maintenance 

 alone on these extra ditches would nearly 

 pay the interest on the cost of the tile 

 work above the cost of ditches; in addi- 

 tion, the saving in land would be consid- 

 erable. Furthermore, if tile were prop- 

 erly laid they would give sufficient drain- 

 age all of the time, while ditches give 

 their best results only for the first few 

 weeks after they are cleared of grass and 

 weeds. 



Pumping Plant. 



The location of this plant is quite 

 favorable, as it is on the lowest ground 

 in the tract and at the junction of three 

 large canals, making the distance that 

 the water must travel to reach the plant 

 about as small as practicable. 



Steam for the three following pumping 

 units is furnished by two water-tube 

 boilers and one return tubular boiler, 

 crude oil for fuel and a feed-water heater 

 being used. 



First, a 40,000 gallon per minute 

 maximum capacity rotary chamber-wheel 

 pump, rope driven from a 16 by 24 inch 

 automatic noncondensing engine; second, 

 one 42 by 16 inch Menge pump, connected 

 by a rope drive and a bevel gear to a 16 

 by 24 inch automatic noncondensing en- 

 gine; third, one centrifugal pump with 

 36-inch diameter discharge pipe, direct- 

 connected to a double vertical engine. 

 Pumps 1 and 2 discharge into open flumes 

 at an average head on pump of about 

 10 feet, which is about 5 feet greater than 

 necessary. Pump 3 has a siphon on the 

 discharge pipe, but the end is not always 

 submerged. 1 



The capacity of this plant has usually 

 been large enough to remove the water 

 before any damage has resulted from 

 flooding. Due to the rope drives, the 

 plant has been stopped several times for 

 repairs when the loss of a pump was a 



1 U. S. Dept. Agr., An. Rpt. Office Expt. Stas. 

 1909, p. 420, 



