WATER RESOURCES 199 
world is wealthy enough to afford. Yet water is a renewable re- 
source, but it has a value measurable in dollars, and each usable 
gallon that flows unused to the sea is an unforgivable waste. 
The arid areas of the west and of other parts of the world have 
water resources to develop as a foundation for urban centers, for 
industry and for the agricultural hinterlands. Research, planning, 
and construction should proceed at an increasing rate to make the 
promise of today the actuality of tomorrow. There is much to be 
done, and we should set ourselves to the task of doing it promptly, 
cooperatively, and vigorously. 
