POND CONSTRUCTION 



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Figure 8. — An inexpensive pond outlet gate that can be made from materials on hand. 



collecting fish outside (fig. 9) . The 

 other has the outlet kettle and catch 

 basin inside the pond. 



The plan of a conventional type 

 of catch basin and outlet is shown 

 in figure 10. Built of concrete, this 

 structure makes it possible to con- 

 trol the water level and to drain 

 the pond. The outlet is at the low 

 point in the bottom of the pond, 

 usually midway of one side. The 

 catch basin should extend 6 to 10 

 inches above the bottom of the pond. 



The chimney usually has two sets 

 of slots. The outer slots are pro- 

 vided for a screen (.4), which pre- 

 vents fish from leaving the pond 

 and debris from entering the pipe- 

 line. The screen is made of hard- 

 ware cloth on a wooden frame which 

 fits into the slots. The screen may 

 be as fine as 8 meshes to the inch 

 or as coarse as 4, depending on the 

 use to which it will be put. 



The second set of slots is for 

 dam boards, or stoplogs, which are 



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