204 



on forests^ and surface conditions in general." Hall and Maxwell in 

 their study gathered together the data for a number of rivers from 

 I'ecords which had been kept for sixteen to thirty-four years. The follow- 

 ing data, taken from their table on page 4 of Hall and Maxwell's papers, 

 will furnish proof that floods are on the increase. 



The Potomac River was measured at Hai-per's Ferry, Va. It drains a 

 basin of 9,363 square miles. In the first period of record (1S90-189S) of 

 nine years there wei'e nineteen floods lasting thirty-three days. There 

 were 1,351 days of low water. 



In the second period of record (1899-1907) of nine years there were 

 twenty-six floods lasting fifty-seven days. The increase of rainfall in the 

 second period was only .13 of an inch per year. Days of low water 1,693. 



The Mononpahela River was measured at Lock 4, Pennsyh-ania. It 

 drains a basin of 5,430 square miles. 



In the first period (1886-1896) of eleven years there were thirty floods 

 lasting fifty-five days. There were 912-days of low water. 



In the second ])oriod (1897-1907) of eleven years there were fifty-two 

 Hoorls lasting one hundred days. There were 979 da:.s of low vvater. The 

 rainfall decreased only .08 of an inch per year. 



The Cumherland River was measured at Burnside, Ky. It drains a 

 basin of 3,7.';9 square miles. 



In the first period (1890-1898) of nine years there were thirty-two 

 floods lasting eight-nine days. There were 1.261 days of low water. 



In the second period (1899-1907) of nine years there were forty-three 

 floods lasting 102 days. Thei'e were l..'">76 days of low water. The rainfall 

 decreased .54 of an inch per year. 



The Wateree River was measured at Camden, S. C. It drains a basin 

 of 5,135 square miles. 



In the first period (1892-1899) of eight years there were forty-six 

 floods lasting 147 days. There were 1,164 days of low water. 



In the second period (1900-1907) of eight years there were seventy 

 floods lasting 187 days. There were 508 days of low water. The rainfall 

 increased .25 of an inch per year. 



The Savannah River was measured at Augusta, Ga. It drains a basin 

 of 7,300 square miles. 



'Tourney, James W. The Relation of Forests to Stream Flow. Yearbook of the Depart inentt* 

 of Agriculture, 1903, pp. 279-288. 



» Hall, Wm. T.. and Maxwell, Hu. Forest Service Circular 176, liUO, 



