SUBJECT INDEX 



327 



Temperature, of air, increase in his- 

 toric time, 172 



of water, increased by use, 219 

 Temporary overdraft, 279 

 Transmissivity of aquifers, 98 

 Treatment, of industrial water, 219 



of sea water, 273 



of sewage, 218 



U 



Underflow, 137 



leaving drainage basin, 155 

 Underground storage, alternative to 



surface storage, 241 

 Units of water measurement, 37n 

 Utilization of water, 213 



inventory of, 237 



Vegetal cover, draft on water re- 

 sources, 85, 163, 181 

 in recharge basins, 189 

 Volcanic rock aquifers, 41, 89 



W 



Waste, reduction of, 61 

 Waste water, legal right to, 255 



use of, 214 

 Water-bearing formation, 4 

 Water conservation, by economy in 

 use, 268 



by nonuse, 278 



by storage in reservoirs, 269 



for maintenance of quality, 268 



Water cost, 181 

 of barren land, 185, 187 

 of "deteriorated" vegetation, 185 

 of forest cover, 179 

 of grass cover, 184 

 of riparian vegetation, 180 

 of surface reservoirs, 241 

 of water-loving vegetation, 83, 84, 

 153 

 Water rights, 243 



based on priority of use, ground 



water vs. surface water, 261 

 importance of reasonable cost, 256 

 Water table, 32 



lowered, by drainage, 194 

 by dry cycles, 77, 171 

 by erosion, 170 

 by navigation channel, 212 

 by pumping, 33, 257 

 by storm sewers, 191 

 raised, by flood-protection devices, 

 208 

 by irrigation, 90, 152, 193, 199 

 by sedimentation, 152 

 regulation of, 197, 272 

 Watercourses, 136 



potentialities of, 144, 226 

 surface waters in, 247 

 Waterlogging, by artesian pressure, 

 199 

 by irrigation, 86-90, 152 

 by levee construction, 208 

 by sedimentation, 152 

 reduced, by drainage, 197 

 by pumping, 197 

 Well drilling, advance in techniques, 

 230 



Yield of wells and springs, increased 

 by surface reservoirs, 205 



