204 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1910. 



Measurements at Burlington, Iowa (.}0 miles above KeokU-k). 



Method of measure- 

 ment. 



Double floats. 

 ....do 



...do 



...do 



...do 



...do 



....do 



Rod floats. 

 ....do.... 



Measurements made under direel ion of— 



Lieut, (i. K. Warren, United States Army. 



Maj. F. V. Farquhar, Corps of Engineers, United 

 States Army. 

 Do. 

 Do. 

 Do. 

 Do. 



Montgomery Meigs, United States civil engineer. 



W. V. N. Powelson and Lieut. C. S. Hookwalter, 

 United States Navy. 

 In.. 



1 In 18GG there was no standard gauge at Burlington and this gauge reading la ap- 

 proximate only as compared with the present gauge, which was established in 187-. 



The observations listed above, purposely selected as showing the 

 least discharge of record, have led the engineers of the development 

 to establish in their calculations a minimum discharge of 20,000 

 second feet. Other observations of minimum discharge, made in 

 190C> under the direction of Mr. Cooper by a current meter, may 

 serve to show the safe margin of surplus power often available over 

 the amount calculated on the basis of the above minimum. 



Measurements at TfashvUle, Iowa (6 mile* above Keokuk). 



The waters at Keokuk can not accurately be called turbulent. 

 They are not hurled over hidden bowlders and irregular rock with 

 the speed of a Niagara. The river has much less velocity and pre- 

 sents rather the smooth appearance of water running down an in- 



