RECLAMATION OP THE SOIL. 



which is used in making and afterwards cleaning it. 

 For the rest, the width of the drain depends on the 

 body of water which has to be carried away. 



'The distance between two successive feeders depends 

 on the permeability of the soil, the depth of the ditches, 



Fig. 13. 



a, a. Natural level of ground. 

 b. Feeder, four feet deep. 

 c, c. Layers of soil actually drained. 



d, d. Layers of soil not drained. 

 a to e. About three feet. 



Fig. 14. 



a, a. Natural level of ground. 



b, b. Leaders, (five feet deep), or main drains. 



f, c. Feeders. Depth at upper end, 3 ft. 6 in., at lower end, 4 ft. 6 in. 



(In these diagrams the height is exaggerated.) 



the depth to which the land is to be drained, and the 

 general fall of the locality ; it will accordingly range 

 between 30 and 100 feet. 



c. liaising the Level of Part of the Ground. 



If it is undesirable or impracticable to drain a 

 swampy area, it may, if the water stands at a moderate 

 level, nevertheless be rendered useful, by excavating 



