204 



oil forests' and surface eoiulitioiis in general.' Hall and Maxwell in 

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

 records which had been kept for sixteen to tliirty-four years. The follow- 

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

 will furnish proof tliat floods are on the inereast. 



The Potomac River was measured at Harper's Ferry, Va. It drains a 

 basin of 9,363 square miles. In the first period of record (1890-1898) of 

 nine years there were 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 wer(- 

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

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



The MonoHfjahela h'ircr was measured at Lock 4. Pennsylvania. It 

 drains a basin of 5,430 square miles. 



In the first period (18S6-1SU6) of eleveji years there were thirty floods 

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



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

 Hoods lasting one hundred days. Tliere were 979 days of low water. The 

 rainfall decreased only .08 of an inch per year. 



The Cumberland River was measured at Buruside, Ky. It drains a 

 basin of 3,739 square miles. 



In tlie 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. Tliere were 1.57(> days of low water. The rainfall 

 decreased .54 of an inch per year. 



The Wateree River was measured at Camden. S. (\ It drains a basin 

 of 5,185 square miles. 



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

 floods lasting 147 days. Tliere were 1,164 da.^s of low water. 



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

 floods lasting 187 days. There were ."bs days of low water. Tlie rainfa'll 

 increased .25 of an inch per year. 



'J']ie i^avannuh River was measured at Augusla. (ia. It drains a basin 

 of 7,300 Sfiuare miles. 



' Touiiioy, JuniL'.s VV. The Relation of Forests to Stream Flow. VcMrhook of tlio Dopartmonts 

 of .^Kriculture, 1903, pp. 27fl-288. 



' Hail, \\m. 1,. and Maxwell, Hu. Forest Service Circular I'ti, liilO. 



