216 



UJ 



01 



CO 



>- 



_J 



0. 





NOTE. The ponds can of course be of any dimensions, according to requirements 50 yards 

 long by 25 broad would be a convenient size. The faint lines at the lower end of the 

 ponds represent a drain as deep as the deepest part of the pond, so that all the water can 

 be drawn off when necessary. 



