Bui. 854, U. S. Dept. of Agriculture. 



Plate VI. 



. P. R. 0-623 



Fig. I.— Changing the Grade of the Flume. 



Note 12-inch plank laid along top of flume for men to work on while changing grade 



B. P. R. D-699 



Fig. 2.— Laying 10-Inch Concrete Tile in the Flume. 



