WATER AND ICH SUPPLY 



275 



the dairy house, should stand on slightly elevated ground 

 so as to insure drainage away from it. 



Construction of Well. In a properly constructed 

 well, no water should enter, it except near the bottom. 

 This compels the water to pass through a thickness of 

 earth sufficient to purify it where the wells are of a 

 reasonable depth. 



Where there is no rock or hard clay and where the 



Fig. 85. Soil Strata. (From Harrington's "Practical Hygiene.") 



water can be had at a reasonable depth, the driven well, 

 commonly known as the Abyssinian tube well, is the 

 cheapest and one of the safest. This well is made by 

 driving into the ground a water-tight iron tube, the lower 

 end of which is pointed and perforated. 



In case rocks and hard clay must be penetrated, or great 

 depth must be reached to secure water, the bored or 

 drilled well, piped from top to bottom with water-tight 

 iron pipes, will be found most satisfactory. 



