92 



ENGINEERING FOR LAND DRAINAGE. 



are peculiar in one respect, and that is this : No rule or 

 plan applicable to one locality will strictly apply to an- 

 other. A design for a park in one city will not be 

 suitable for another, owing to varying natural features, 

 as well as requirements which must be met. A soil 

 in one locality will drain as readily and perfectly with 

 drains 1 50 feet apart as others will with drains 40 feet 

 apart, and upon this fact depends the distance apart 

 that drains should be placed. It -Cvould be a waste of 

 labor and material to place drains 40 feet apart in 

 some of our soils, while, on the other hand, to place 

 drains at intervals of 150 feet in some soils would 

 come far short of accomplishing thorough drainage. 

 The cost of the work has much to do with the dis- 



80 rods 



Fig. 20. — Drainage of a 40-acre Field containing 

 Pond with Higli Land surrounding it, 



tance apart at which drains are usually placed, and 

 thorough drainage is often sacrificed to this. As ob- 



