18 
BULLETIN 181, U. S. DEPARTMENT OF AGEICULTUEE. 
(7) The probable maximum rate of run-off as determined from a 
hydrograph constructed according to (3) and (6). 
The time required for the Pearl River to rise is shown by the line 
ah in figure 4, A and B, and was about six days in each case. It I 
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would be impossible to predict precisely the effect of improved drain- 
age conditions upon this interval of time, but owing to the increased 
velocity of flow in the channel a less time would be expected, and in 
the computations this time will be taken as five days. 
