ENCLOSING DAMS. 



53 



H. W. S 



L.W. 



lowered, the inside of the dam was filled with clay and bags of 



gravel. 



After the panels were placed in position and the dam filled 

 with clay, etc., the spaces be- 

 tween the twin piles were filled 

 in by driving close sheet-piling, 

 then by converting the lower 

 side of the dam into a continu- 

 ous row of sheet-piling ; extra 

 piles were also driven at the 

 sides of some of the twin piles 

 where it appeared that the 

 panels had not sufficient hold. 



Dam at Entrance of Avon- 

 mouth Dock. 1 For closing the 

 entrance of the lock while the 

 outer clay dam was being re- 

 moved, Mr. Brunlees constructed 

 a timber dam somewhat on the 

 principle of a dock gate (Figs. 

 40, 41). The foundation or base 

 consisted of whole-timber close 

 sheet-piling driven 18 feet into 

 the sand below the foundation 

 of the lock. Above the level of the sill, the timbers were 

 arranged much in the same manner as the horizontal timbers 



'. . W? N. 



FIG. 40. 



SCALE 



40 FEET 



FIG. 41. 



of a gate, strutted to the side walls of the entrance, and forming 

 trusses of a simple and inexpensive character. On the outside, 



.y vol. lv. p. 8; vol. li. p. 153. 



