VARIABILITY AND PREDICTABILITY 
OF WATER SUPPLY 
Questions 
How predictable 1s precipitation in an arid region? 
Are there distinct drought cycles? 
What are the prospects for usable ground water occurrence in 
arid areas? 
What 1s the practicability of locating and estimating volume and 
rate of natural recharge of underground water supplies? 
Within a given watershed, to what degree can the water sources 
and water yield be determined? 
