200 



NEW YORK STATE MUSEUM 



Fig. 13 is a diagram of the revised gagings of Croton river from 

 1877 to 1899, inclusive. 



The maximum, minimum, and mean runoff may be obtained 

 from the tabulations on each figure. 



It is evident that proceeding in the same way as for the fore- 

 going diagrams, figs. 11 to 13, inclusive, diagrams may be prepared 

 for the storage, growing, and replenishing periods, and a curve 

 drawn from which the runoff for a given rainfall may be taken. 



40 



10 10 



40 



UPPER HUDSON RIVER 































































Storage period 



30 











































25 

























































V 









































y 







m 















l B 













I 



« 







30 

























































































































°5 10 15 20 25 



Precipitation in inches 

 5 10 15 20 25 30 35 



Fig. 14 Diagram showing the relation between precipitation 

 and runoff in the Upper Hudson river catchment during the 

 storage period. 



Fig. 14 is such a diagram for the storage period on the Upper 

 Hudson river for the years 1888-1901, inclusive. This diagram 

 shows that aside from the years 1890 and 1894 the runoff of this 

 catchment area was substantially accurate during the storage 

 period. It is probable that in these two years their accuracy 

 may have been interfered with by ice, although just the cause is 

 not definitely known — it may have been in the rainfall. 



Fig. 15 is a similar diagram for the Upper Hudson river during 

 the growing period for the same years. This diagram shows that 

 aside from 1897, the runoffs were substantially right during this 

 period. 



