The error in discharge due to error in the measurement of head over a rectangular notch is given by
1
\(\frac{{dQ}}{Q} = \frac{1}{2}\frac{{dH}}{H}\)
2
\(\frac{{dQ}}{Q} = \frac{3}{2}\frac{{dH}}{H}\)
3
\(\frac{{dQ}}{Q} = \frac{3}{4}\frac{{dH}}{H}\)
4
\(\frac{{dQ}}{Q} = \frac{5}{2}\frac{{dH}}{H}\)