Fig. 10. Elevation and plan of a wooden pond sluice. 

 In very vdde sluices, the single bottom board and the cover bdard of the 

 horizontal shank, and the wall of the vertical shank, opposite the sluice 

 boards, may be replaced by little cross boards fitted closely to each other. 



Woter lavel 



F^ond bottom 



Bottom 

 pond ditch 



ilg. 11. ABJVE: Cross sectiai through a pond da-ti vrfth suitable and 

 correctly built-in sluice. BELOlv: Tito hardly suitable types of sluice 

 installation. CH03SL1NED: Natural ground; DOTTED: Filled ground. 



66 



