FARM SANITATION 



481 



or bored with a common well auger. These wells are usually 

 oi' considerable diameter in order that there may be a reser- 

 voir for a quantity of water within the well itself. The shallow 

 well is the one most easily contaminated and is the one which 

 should be most carefully protected. It is best that the well 

 be located at some distance from any leaching cesspool, 

 privy, or manure heaps. It is difficult to state just how far 

 away, as some soils are much more open than others and the 

 impurities will travel a correspondingly greater distance 



Fig. 300. A sketch showing hew the water of a shallow well may be- 

 come contaminated from manure yards and cesspools. (Kansas Exp. Sta. 

 Bui. 143.) 



through them. Then, again, drainage lines become quite 

 thoroughly established in the soil in certain directions; and 

 if the well and a source of contamination should happen to be 

 placed in one of these seepage lines, the contamination would 

 take place at a much greater distance than otherwise. It is 

 best, however, that the well, especially a surface well, be 

 located at least 100 feet from any disease-laden filth. 



Much can be accomplished in providing protection against 

 contamination from the surface: (1) The curb or well wall 



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