23 



of overflow wa//. 



+- Crest of overflow wa/l 

 ~\Minene inch plsfe 



Section 



Section 



rtiners inch 0/atc 



TYP/C4L /I/HER.? INCH BOX fO/t TffKE OUT 

 FROM &KRVITY f/ff L/HE UMDCR. HO 

 Fig. 16. 



Miners' inch box and takeout from pipe line under no pressure. 



Where a pipe line is under no pressure the conditions of flow are similar 

 to those in an open ditch. The pipe line is placed on grade and to take out 

 water from it, it is necessary to form a takeout box by means of which the 

 water is checked and forced to rise to the height at which it is delivered to 

 the irrigator. This is somewhat similar to the check gates which are placed 

 across an open canal where it is necessary to raise the water level to make 

 a delivery into the head of the irrigator's flume or ditch. For a pipe line 

 the takeout and measuring device can be formed in one structure as shown 

 in Fig. 16. This form of box is used on the Fruitlands Irrigation system 

 near Kamloops and is similar to the boxes used on many irrigation systems 

 of southern California. The box is rectangular and is divided into two 

 compartments by an overflow wall at the bottom of which there is an open- 

 ing, controlled by a slidegate. In one of the side walls of the upstream 

 compartment a miners' inch plate is placed with the center of the orifice 8 

 inches below the crest of the overflow wall. The walls are all reinforced 

 with strands of barb wire. The water enters the upstream compartment 



