xxviii TABLE OF CONTENTS 



CHAPTER XIX 



THE WATER SUPPLY IN DRY AREAS 



Page 



1. THE SCARCITY OF WATER 442 



(a) This fact should be carefully considered. 



(b) Various results from the determinations. 



(c) The two principal sources of water. 



(d) The abundance of ground water. 



(e) The available character of ground water. 



(f) The necessity for determinations. 



2. WHY WATER Is SCARCE 444 



(a) Because of the low precipitation. 



(b) Because of the character of the precipitation. 



(c) Because of the hardness of the unbroken soil. 



(d) Because of the chinook winds. 



(e) Because of the rapid evaporation. 



3. THE SOURCES or WATER IN DETAIL 446 



(a) Water caught from roofs and in draws. 



(b) Water which comes from springs and streams. 



(c) Water which comes from irrigating ditches. 



(d) Water which comes from wells. 



(e) Water which comes from artesian sources. 



4. How WATER THAT FALLS MAY BE SAVED 449 



(a) By constructing cement lined cisterns. 



(b) By erecting dams of proper construction. 



(c) By piping from distant springs. 



5. How WATER MAY BE RAISED 450 



(a) By wind power. 



(b) By gasoline power. 



(c) By steam power. 



(d) By electrical power. 



6. RESERVE WATER AND HOME BUILDING 452 



(a) Essential to operations in the home. 



(b) Essential sometimes in the garden. 



(c) Essential sometimes in the orchard. 



(d) Essential sometimes in growing shelter belts. 



(e) Essential sometimes to the keeping of live stock. 



7. APPLYING RESERVE WATER TO THE SOIL 455 



(a) The ordinary limit of such application. 



(b) The small amount that is called for. 



(c) Citation of instances of application. 



8. DRY FARMING WITH VERY LIGHT RAINFALL '. . 456 



(a) Crops grown at Indian Head, Sask., in 1894. 



(b) Crops grown in Utah in 1910. 



(c) Crops grown in Montana in 1910. 



