io 6 o 
Journal of Agricultural Research 
Vol. V, No. 23 
mental data as would the general curve equation. The experimental 
data indicate, however, that the general curve equation would hold true 
for a greater range of notch lengths and heads than would the general 
straight-line equation. Table I, for the Cipolletti notches, gives the dis¬ 
charge values for the different heads as read from the curve, the experi¬ 
mental discharge values (observed discharges) at greatest variance with 
the curve discharge values, and the values of the exponents n and coeffi¬ 
cients C necessary in the Cipolletti formula to give the discharges ob¬ 
tained in the experiments. The values of n and C in the table show that 
the discharges for any notch, if plotted logarithmically, would not give a 
straight line, since neither the n’s nor the Cs are constant. A compari¬ 
son of the curve discharge values and the observed discharges in the 
table also serves to indicate the accuracy of the experimental data.. 
The variations of the n’s and Cs also hold for the rectangular notches, 
but are not so pronounced as in the case of the Cipolletti notches, since 
the discharge curves for rectangular notches are flatter. 
