by opening a valve inserted in the polyethylene 

 hose between the winch and the filtering unit. 



The watermeter is a 1 1/2-inch bronze 

 wobble plate type commonly used by utility 

 companies. It registers up to one hundred 

 million liters in hundreds of liters. Tens 

 and units are read from a rotating needle 

 dial. Calibration of the meter by the Helix 

 Irrigation District Laboratory showed that it 

 registers 2.37 percent higher than the true 

 volume at rates of 75 to 98 liters per minute, 

 the delivery rate range within which the 

 towed pump system operates. 



Each funnel (fig. 9) is formed of 1/1 6- inch 

 PVC sheet stock. A short length of 1 1/2-inch 

 PVC pipe glued tangentially into a hole near 

 the top Serves as the inlet, and a specially 

 machined PVC neckpiece glued to the bottom 

 serves as the mounting for the collecting 

 bucket. The inlet is connected to a pipe from 

 the double-throw valve by a short length of 

 plastic tubing secured with hose clamps. The 



greatest portion of the funnel surface between 

 the inlet and the neck consists of windows 

 covered by 105 /i -mesh stainless steel cloth 

 (the diagonals of the mesh openings are 

 I50fl). The stainless steel cloth is glued 

 along the margins of each window with PVC 

 solvent. All internal areas of glue were made 

 as smooth as possible. 



Each collecting bucket (fig. 10) is a 3-inch 

 length of 2-inch I.D. PVC pipe that is bayonet 

 mounted on the neck of the funnel. Two "J" 

 slots in the upper edge of the bucket fit 

 over a pair of pins projecting from a steel 

 clamp around the neck. The steel clamp is 

 set in a groove around the neck and a rubber 

 "O" ring is set in a lower groove to seal the 



m 



Figure y.--The filtering funnel with the bayonet mounted 

 collecting bucket and the friction fitted cap in place. 



Figure 10.--The collecting bucket with the friction cap 

 detached. The edge of the bucket is recessed to ac- 

 commodate the tension screw of the steel clamp on 

 the neck of the funnel. The rubber "O" ring on the 

 neck of the funnel seals the bucket below the edge of 

 the large recess. 



10 



