;3(i 1- 



WATEK-TKANSI'UKT. 



structiou to the rest of the sluice are added to strengthen the 

 structure. They maj' however consist only of coarse drv stone 



Fig. 20.^. 



Masonrv-diiiii at Heireiiwies (Blnck Forest). 



masonry ; (h) is the channel for the passage of the water in the 

 direction {m ii) and is closed by a sluice-gate. 



Fig. 201, shows another weaker kind of wooden sluice in the 



