DRAINAGE. 



99 



pleteness with which the water of rains is removed from below, 

 do we lessen the evaporation by which this crust is so largely 

 formed. 



DRAINING OPERATIONS. 



LAYING OUT THE WORK.* 



The Outlet. — The first important point, in arranging a sys- 

 tem of drains, is to seek the lowest suitable point at which an 

 outlet can be obtained. This should be, whenever possible 

 without too great cost, at least four feet (better four and a half 

 feet) below the general level of the land near it, that the drains 



Outlet, secured with masonry and grating. 



may be covered to that depth, even in the lowest part of the 

 land to be drained, though it is sometimes better to place the 

 drains at a less depth for a short distance, than to incur the cost 

 of deepening a ditch on a neighbor's property for a very long 

 distance. 



The position and depth of the outlet being established, it 



* For want of space, the reasons for adopting the methods herein set forth are not 

 discussed. They are those which experience has shown to be the best. 



