THE WATER SUPPLY IN DRY AREAS 



453 



Under conditions that are very dry, it may not be 

 possible to catch and retain enough water from roofs 

 to supply even the needs of the household. Especially 

 is it so in the case of the new settler, as the shack which 

 he builds is small. In choosing the site for the same, 

 unless the presence of ground water is assured, the pos- 

 sibility of collecting flood waters should be kept in mind. 



DRY LAND MONTANA FARM GARDEN. 

 Courtesy Great Northern Railway Co. 



Of course, where the presence of ground water is as- 

 sured, the problem is easy. 



For the needs of a garden, water must come from 

 a tank or reservoir of considerable .capacity, or from 

 wells. The amount of the supplemental water for the 

 garden of the farmer, when well managed, is not very 

 large. Where the precipitation^ is not less than 15 inches 

 per year, it may be dispensed with altogether. With a 



