ure Z. — Intensity-duration-frequency curves for reourrenae intervals of 2 to 50 years 

 and dicrations of 2 minutes to 6 hours for the Davis County Experimental Watershed. 

 Curves for precipitation Zone 1 are shown in Za, Zone 2 in Zb, Zone 3 in Zc, and 

 Zone 4 in 2d. (Log-extreme distribution) 



3 

 

 z 



z 

 u 

 Z 



z 



z 

 o 



A, 



St 

 0. 



4 S6789IO 15 



RECURRENCE INTERVAL, YEARS 



20 3S 30 



40 



SO 



B 



3 

 

 z 



Z 

 Z 



Z 



Z 



o 



ly 



4 5678910 IS 



RECURRENCE INTERVAL. YEARS 



20 3S 30 



SO 



10 



