THE FLOW OF WATER IF DRAIN TILE. 5 



DESCRIPTION OF EXPERIMENTAL PLANT. 



PUMPING PLANT. 



A eomplete pumping plant was installed to supply the water 

 necessary to carry on the tests. The pump used was an 8-inch 

 side-suction centrifugal pump. Its economical capacity was 1,800 

 gallons per minute. The suction pipe, 10 inches in diameter and 

 approximately 40 feet long, was laid sloping from the pump to the 

 intake ditch or sump. The discharge pipe, 8 inches in diameter, 

 was so arranged that the entire capacity of the pump could be de- 

 livered to the supply tank with the least frictional losses. 



The pump was run by a 30 h. p. engine rated at 200 r. p. m. It was 

 equipped with an oscillating-type magneto with the make-and- 

 break spark. It was started on gasoline, and after becoming warm 

 operated on kerosene. The engine was connected to the pump by a 

 10-inch, double thickness, endless leather belt. 



SUPPLY TANKS. 



In order to maintain a constant flow through the tile line, a supply 

 tank 7 feet 9 inches by 7 feet 9 inches by 10 feet 9 inches deep (A, 

 PL I) was built to receive the pump discharge. On the side of this 

 tank opposite the entrance of the pump discharge pipe, a measuring 

 weir and a hook gage wer.e installed. A baffle board extending from 

 the top of the tank to within 2 feet of the bottom was constructed. 

 Thus the movement of the water from the discharge of the pump 

 was quieted sufficiently to obtain a quiet surface on the water at the 

 hook gage and weir. 



Since the entire discharge of the pump was not required for all the 

 experiments, an overflow tank (B, PL I) was built. Its size was 

 9 feet 6 inches by 9 feet 6 inches by 5 feet 6 inches deep. A trough 

 from this tank carried the overflow water back to the intake ditch. 



For regulating the flow into the supply tank, an 8-inch gate valve 

 was inserted in the pump discharge pipe. This valve is shown in 

 Plate I, between tank B and the pump house. The water not 

 required for the experiment passed through another 8-inch gate 

 valve into the overflow tank. When the entire discharge from the 

 pump was used in the tile, the gate valve in the overflow tank was 

 closed. 



Another tank containing baffle board", hook gage, and weir was 

 used at the lower end of the tile line to measure the discharge from 

 the tile as a check on the amount of water entering the tile. How- 

 ever, the measurements from this tank, as will be explained later, 

 were not used in the final computations. 



Both weir tanks were covered with boards to prevent any surface 

 movement on the water being set up by winds. 



