i 7 8 



INDEX 



Stovepipe wells 1 . 



method of sinking, 105, 107. 

 Streams: 



pollution of, 12. 



use of for water supplies, 12. 

 Sunlight, purification of water by, 6-7. 

 Surface waters: 



sources of, 6. 



pollution of, 6-8, 12. 



use of for water supplies, 7, 8, 12. 

 Syncline, definition of, 39. 



Tanks: 



construction of, 155. 



cost of, 157. 



elevation of, 157. 



freezing of, 156. 



house, 150. 



location of, 155. 



natural, 8. 



pneumatic, See Pneumatic tanks. 



size of, 156. 



water supplies from, 155. 

 Taste of water supplies, 169. 

 Temperature of ground waters, 33. 

 Till: 



definition of, 36, 42. 



dug wells in, 42. 



ground waters in, 42, 8l. 



pollution conditions in, 45, 81. 

 Trap: 



artesian flows from, 57. 



cost of drilling in, 119. 



definition of, 37. 

 Tuff, definition of, 37. 

 Turbines, use of, 129. 

 Typhoid fever on farms, I. 



Underground: 



streams, 13, 17, 20. 

 passages, See Caverns, 

 waters, See Ground waters. 



Valve: 



buckets, 120, 121. 

 foot, 122. 



Water, See also Ground waters, Rain, 

 Springs, Surface waters. 



Water: 



absorption by rocks, 4, 29. 



absorption by soils, 29, 30. 



alga3 in, 171. 



alkalinity of, 170. 



analysis of, 164. 



bacteria in, 172. 



bacteriological examination of, 164-166. 



boiler, 162. 



color of, 1 68. 



consumption of, per capita, 157. 



deep-seated, 53. 



hardness of, 162, 170. 



harmful and harmless ingredients in, 163. 



iron in, 169. 



lifting of, 120-130. 



mineralization of, 160. 



occurrence of, See under names of spe- 

 ific rocks and soils. 



odor and taste of, 169. 



original purity of, 1 60. 



pumping of, 120-130. 



purification, artificial, 168-172. 



purification, natural, 6-7. 



running, convenience of, 151-152. 



sanitary tests of, 165-167. 



sources of ground, 28. 



sources of surface, 6. 



suspicious, 163. 



temperature in ground, 33. 



turbidity of, 169. 

 Water bearing formations, 35-39. 

 Water provinces, principal, 59. 

 Water supplies: 



on farms, i. 



purification of, 168-172. 

 Water table: 



definition of, 50. 



description of, 50. 



form of, 51. 

 Water works: 



dams, use of, 154. 



elevated tanks, use of, 155. 



farm, 151-159- 



gravity supplies from reservoirs, 154. 



gravity supplies from springs, 153. 



gravity supplies from wells, 152. 



siphon, use of, 152. 

 Weathered-Rock water province, 61. 



