THE FLOW OF WATER IN DEAIK TILE. 5 
DESCRIPTION OF EXPERIMENTAL PLANT. 
PUMPING PLANT. 
A complete 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 th^i. 
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 mth the least frictional losses. 
The pxmap 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 pimap 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 wei;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. 
