148 W. & L. E. GURLEY, TROY, NEW YORK 



FLUMES 



Automatic water stage registers may be used to advantage 

 on flumes that have been rated in a proper manner. In such 

 cases the record of stage is made by the water stage register, 

 and this record is applied to a table of discharge. 



WEIRS 



A similar application of automatic registers is desirable 

 at weirs for measuring flow in cases where the head on the 

 \N ir varies. 



I-'K.. 



(lurlcy rriiili::^ KCL' 

 Survey on Alplaus Creek near Charlton, N. Y., to record 

 the flow over a V-notch weir. 



If refined measurements are required the coefficients used 

 in the weir formula by which the discharge is computed should 

 be obtained from an actual rating of the weir used. Weir 

 coefficients that are obtained in the laboratory do not apply 



