How to obtain it. 



55 



diverted into the channel DD. The water flows from the direction 

 shown by the arrow at F, and what is not required for the pond 

 passes off by the channel DD, which rejoins the stream below the 

 dam. At the point d a horizontal leaf screen may be placed in 

 the stream, which passes over it, and the amount of water required 

 for the pond KK is drawn off from the box underneath this 

 screen. Should a perpendicular leaf screen only be used, then let 

 it be placed across the stream at the point C. A sluice may be 

 fixed just below it for greater safety, but my experience of the 

 working of these screens is that no sluice is as a rule required, as 

 the surplus amount of water gets away by the channel DD, and 



the screen at C becomes partially stopped by floating matter and 

 prevents any excess of water entering the pond. One great 

 advantage of the horizontal screen is that no fish can escape from 

 the pond in that direction. Where a perpendicular screen only 

 is made use of, it is needful to have another screen below it to 

 keep in the fish. 



It is not at all necessary that the leaf screen be close to the 

 dam. It may be some distance from it, so as to allow the fish 

 access to some spawning ground, and this spawning ground may 

 often be largely increased by making a serpentine spawning race. 

 This, in a great many places which I have examined, the ground 

 will admit of. 



