iy6 



INDEX 



Limestone: 



definition of, 37. 

 drilled wells in, 43. 

 ground waters in, 43, 83, 161. 

 pollution in, 46, 83. 



Marble, definition of, 38. 

 Marl, definition of, 36. 

 Mississippi-Great Lakes water province, 

 64. 



Nitroglycerine, use of, in wells, 113. 

 Odor of water, 169. 



Pacific Coast water province, 67. 

 Packers, types of, 116. 

 Packing, method of, 116. 

 Percussion drilling: 



cost of, 119. 



method of, 105, 106. 

 Piedmont Plateau water province, 62. 

 Pipes: 



corrosion of, 102. 



cost of, 153. 



depth laid, 153. 



freezing of, 27, 153. 



lead, use of, 27. 

 Plugging, method of, 116. 

 Pneumatic tanks: 



advantages of, 158. 



cost of, 159. 



use of, 157-158. 

 Pollution of ground waters, 44-47, 81-83, 



164. 



Pollution of springs, 21, 22, 25, 26. 

 Pollution of wells: 



artesian, 58. 



deep, II, 112. 



driven, 98. 



dug, 77, 83, 84, 86-88. 



general, 75, 164. 

 Ponds: 



artificial, 8. 



pollution of, 7-8. 



use of, for water supplies, 8. 

 Pores, ground waters in, 40, 41, 42, 81-82. 

 Porosity of rocks and soils, 29, 72. 

 Pressure tanks, See Pneumatic tanks. 



Pumping: 



gasoline used for, 129. 



power used for, 129. 



windmills used for, 129. 

 Pumps: 



centrifugal, 127. 



chain, 120-121. 



deep well, 120, 122, 125. 



force, 125-126. 



pitcher, 121. 



power, 127-129. 



rotary, 127. 



siphon, 127. 



suction, 120-122. 

 Punching: 



cost of, 119. 



method of, 68, 95. 

 Purification of water supplies, 168-172. 



Quartzite: 



cost of drilling in, 119. 



definition of, 37. 



ground waters in, 43. 



porosity of, 29. 

 Quicksand : 



ground waters in, 43, 72. 



screens used in, 72, 115. 



troubles with, 40. 



Rainfall: 



absorption of, 4. 



distribution of, 2. 



on roofs, 147. 

 Rain water, purity of, 160. 

 Rams, hydraulic, use of, 21, 128. 

 Reservoirs: 



artificial, 8. 



water supplies from, 154. 

 Rivers: 



pollution of, 12. 



use of, for water supplies, 12. 

 Rock waters: 



movements of, 52. 



occurrence of, 42-44, 72, 82, 83. 



safety of, 44. 

 Rocks: 



absorption of water by, 4, 29. 



air circulation in, 139-142. 



classes of, 35. 



