FARM SANITATION 483 



free from contamination. Occasionally drainage lines are 

 so thoroughly established in the soil and through fissures in 

 the rock that the water of the deep wells may be contami- 

 nated from the surface. 



Springs are sometimes used as a source of water supply. 

 It is best that the spring discharge at as high an elevation 

 as possible in order that there may not be many habitations 

 above it. When springs furnish water from some depth, the 



Fig. 301. An improved spring showing how it may be protected from 

 surface water. 



water is quite sure to be free from all organic matter. In 

 considering a spring as a source of water supply, it should be 

 definitely known that a sufficient amount of water will be 

 furnished throughout the year. Most springs are irregular 

 in their discharge and at times furnish little or no water. 



The ideal location for a spring is at an elevation above the 

 farmstead, to which the water may be led in pipes and perhaps 

 allowed to flow constantly, the surplus being wasted. If the 

 spring is below the farmstead, yet high enough to permit a 



