EXCESSIVE RAINS 



47 



storms. 

 18 



The equations for the three curves are y= o.'s 



12 



y = ~"<fs ana ^ = ~~o^6' respectively. 



Fig. n, from an article * by J. de Bruyn-Kops, of Savannah, 

 Ga., shows even more markedly the variation in the position 

 of the curve, depending on the number of infrequent, isolated 



RELATION BETWEEN 



INTENSITY AND DURATION 



OF VARIOUS STORMS 



SAVANNAH, GA. 

 1889.1906 



--^*' Maximum 



Once in 2 years 

 Once in each year 

 ice each year 



3 times each year 



4 times each year 

 times each year 



15 30 45 60 



Duration of Storms in Minutes 



FIG. ii. 



storms of maximum intensity, which are chosen to locate the 

 position of the curve on the diagram. In Fig. n there are 

 seven curves, each one so drawn as to indicate definitely the 

 intensities of. storms of designated frequency, varying from 

 storms of such high intensity as to give absolute maxima for 

 the seven years considered through those storms occurring once 



* Trans. Am. Soc. C. E., Vol. LX, p. 250. 



