CRAIGEND. 



137 



sary. Only once it failed, and flooded the dam, with the usual 

 sequence, the escape of most of the fish. The supply was led into 

 the dam through a bulk-head in the side of the old course above the 

 junction of the new cut (Fig. 88). A screen was fixed, not unlike 

 the ordinary leaf-screen, but so designed that no dirty water should 

 pass through (Fig. 89). The principle is simple, merely making use 



PIG. 89 scale 



of the suction, which is generally so troublesome in ordinary intakes. 

 It was accomplished as follows : the screen was laid level with the 

 bottom of the stream (Fig. 90) ; the side of the screen nearest the 



Fio. 90 scale ^. 



dam was cut at an angle, and the sides of the burn were revetted 



