INDEX 



175 



Fossils, definition of, 38. 

 Freezing of pipes, 27, 153. 

 Freezing of tanks, 156. 



Gas, occurrence in wells, 88. 



Gasoline engines, use of, for pumping, 129. 



Glacial drift: 



artesian flows from, 56. 



water province, 59. 

 Gneiss: 



definition of, 38. 



ground waters in, 44. 

 Granite: 



artesian flows from, 56. 



cost of drilling in, 119. 



definition of, 37. 



ground waters in, 44. 



pollution conditions in, 83. 



porosity of, 29. 

 Gravel: 



definition of, 36. 



driven wells in, 40. 



ground waters in, 40. 

 Great Basin water province, 66. 

 Ground water: 



absorption of, 30-31. 



amount of, in crust, 30. 



depth of, 108-110. 



effect of drainage on, 86. 



effect of forests on, 86. 



from lakes or streams, 31. 



"lakes," 33. 



location of, 48-50. 



mineralization of, no. 



movements, 51, 83. 



occurrence, 28-34, 4- 



pollution of, 45, 46, 164. 



quality of, 109-110. 



recovery of, 4. 



relation of quality to depth, 109-110. 



relation to mountains, 32. 



"rivers, "32. 



safety of, in rocks, 44. 



sanitary tests of, 165-167. 



source of," 28. 



source of mineralization of, 45, 160. 



temperature of, 33. 

 Ground-water, movements in: 



bedding planes, 82. 



Ground-water, movements in: 



caverns, 82. 



faults, 83. 



joints, 82-83. 



open passages, 81, 82, 83. 



rocks, 81-82. 

 Ground water, occurrence in: 



caverns, 43. 



cleavage planes, 43. 



joints, 43, 44. 



pores, 40, 41, 42. 



rocks, See Rock waters. 



Hardness of water: 



cause of, 162. 



treatment for, 170. 

 Hard pan: 



definition of, 36. 



Head, fluctuation of, in wells, 133, 138. 

 High Plains water province, 64. 

 Hot air engines, use of, for pumping, 129. 

 Hydraulic drilling, method of, 105, 107. 

 Hydraulic rotary drilling: 



cost of, 1 19. 



method of, 105, 107. 



Iron, in water supplies, 169. 



Jetting: 



cost of, 119. 



method of, 68, 103-104. 

 Joints: 



artesian flows from, 55, 56. 



definition of, 39. 



ground waters in, 44, 72, 82, 83. 



pollution of waters in, 46. 



Lakes: 



distribution of, 7. 



pollution of, 6. 



purification of, 6-7. 



use for water supplies, 7. 

 Lavas, artesian flows from, 57. 

 Lime compounds, use of, in water puri- 

 fication, 170, 172. 

 Limestone: 



artesian flows from, 55-56. 



caverns in, 17, 43, 83. 



cost of drilling in, 1 19. 



