RECLAMATION OF THE SOIL. 



depth, shape and distance from each other require 

 careful consideration. 



--^. -e- 



Fig. 12. 



a, a. Contour lines. e. Leaders. 



e, e. Water parting. d. Main drain. 



b. Feeders. 

 (The figures 170, 160, 150, and 140 give the elevation in feet above sea-level.) 



The gradient, or fall, should be such that the water is 

 carried away with sufficient rapidity, without causing 

 injury to the base and sides of the drains by the scouring 



