The error in discharge $$\left( {\frac{{{\text{dQ}}}}{{\text{Q}}}} \right)$$  to the error in measurement of head $$\left( {\frac{{{\text{dH}}}}{{\text{H}}}} \right)$$  over a rectangular notch is given by

A. $$\frac{{{\text{dQ}}}}{{\text{Q}}} = \frac{1}{2} \times \frac{{{\text{dH}}}}{{\text{H}}}$$

B. $$\frac{{{\text{dQ}}}}{{\text{Q}}} = \frac{3}{4} \times \frac{{{\text{dH}}}}{{\text{H}}}$$

C. $$\frac{{{\text{dQ}}}}{{\text{Q}}} = \frac{{{\text{dH}}}}{{\text{H}}}$$

D. $$\frac{{{\text{dQ}}}}{{\text{Q}}} = \frac{3}{2} \times \frac{{{\text{dH}}}}{{\text{H}}}$$

Answer: Option D