IIIO 
Journal of Agricultural Research 
Vol. V, No. 33 
(*2) The formula 
0-3.247LH 1 ’ 48 - 
(rifiSy 
gives discharge values for i-, 1.5-, 2-, 3-, and 4-foot rectangular notches 
that agree within a maximum of approximately 1.2 per cent and within 
an average of 0.28 per cent with the curves plotted from the experimental 
data. 
(3) The discharges through the 0.5-foot rectangular notch do not fol¬ 
low the same law as those for the longer notches. The formula 
C-i.SBffy.+ssgo) 
gives values consistent with the curve plotted from the experimental 
data. 
(4) The Francis formula gives values within approximately 2 per cent 
of the actual discharges, so long as the head does not exceed one-third 
the length of the notch. 
(5) Within the limits of the experiments the formula 
Q= 2 > .08L 1 * 022 H aAM - 003L) 
gives discharge values for the 1-, 1.5-, 2-, 3-, and 4-foot rectangular 
notches that agree within a maximum of 0.7 per cent, and an average 
of 0.26 per cent, with the values given in the curves plotted from the 
experimental data. 
(6) The formula Q=* 1.566# 1 * 504 gives values for the 0.5-foot rectan¬ 
gular notch that agree within 1 per cent with the curves plotted from the 
experimental data. 
(7) The curve-line formula for rectangular notches takes account of 
the law of variation of the discharge curves better than does the straight- 
line formula and, consequently, it appears that it will give closer values 
for higher heads and longer notches than those experimented with. 
(8) The formula 
Q= 3 . m7 LH^~(j^^H^+o.6o 9 H^ . 
gives discharge values for the 1-, 1.5-, 2-, 3-, and 4-foot Cipolletti notches 
that agree within 0.5 per cent with the curves plotted from the experi-. 
mental data, except in the case of the lower heads on the i-foot notch, 
where the maximum divergence is approximately per cent. 
(9) The discharges through the 0.5-foot Cipolletti notch do not follow 
the same law as those for longer notches. The formula 
Q = 1.593^(1+ g o ^)+o. 5 8 7 H 2 - 6S 
represents the discharges through such a notch. 
