Which one of the following expresses the error in discharge due to error in the measurement of head over a triangular notch?
(a) $\frac{dQ}{Q}=\frac{5}{2}\frac{dH}{H}$
(b) $\frac{dQ}{Q}=\frac{3}{2}\frac{dH}{H}$
(c) $\frac{dQ}{Q}=\frac{7}{2}\frac{dH}{H}$
(d) $\frac{dQ}{Q}=\frac{1}{2}\frac{dH}{H}$
