64 



Kuichling plotted available data and derived the following formulas: 



' 44000 ] 



Q = + 20, M, for floods exceeded occasionally; 



tM + 170 J 



r 127000 ] 



and Q + ' \- 7.4 } M, for floods exceeded rarely. 



[m + 370 ■ J 

 In U. S. Geolog. Survey Bulletin No. 147, 

 r 46790 



Q 



,M4-320 



+ 15 M, is proposed. 



Many other foiinulas have been proposed and are given in a paper by Mr. 

 Fuller in the Trans. Amor. Soc. C. E., Vol. XXXIX, p. 1068. 



When applied to the Wabash they give widely varying results because 

 none of them was made for the topographical and meteorological conditions 

 which characterize our floods. 



Fig. 1. Drainace Area of tlie Wabash Itiver above Lafayette, Ind. 



The following extract from an article by the author in Engineering News, 

 April 24, 1913, will explain the conditions causing and accompanying this flood. 



A series of heavy rains, extending over the entire drainage area of the 

 Wabash River, commenced March 21 and continued at intervals vmtil March 

 26, raising the river to unprecedented heights, causing the loss of many lives 

 and the destruction of several million dollars of property. 



Previous floods which did niucli danuige occiu'rcd June 11. ISoS, August 



