Question

A canal was designed to supply the irrigation needs of 1000 ha of land growing rice of 150 days base period and having a delta of 125 cm. If canal water is used to irrigate wheat of base period of 120 days and has a Delta of 50 cm, the area that can be irrigated is

• A. 1000 ha
• B. 2000 ha
• C. 500 ha
• D. 1500 ha

Answer 1

The correct option is B 2000 ha

$D=\frac{A}{Q}$

$\Delta =8.64\frac{B}{D}$

${\Delta }_{Rice}=8.64\frac{B_{rice}}{D_{rice}}$

$D_{rice}=8.64\times \frac{150}{1.25}=1036.8ha/cumec$

$D_{wheat}=8.64\times \frac{120}{0.5}=2073.6ha/cumec$

$\therefore Q_{Rice}=Q_{wheat}=\frac{A}{D}$

$\therefore 0.964\times D_{wheat}=A_{wheat}$

$\therefore A_{wheat}=0.964\times 2073.6$

$=1998.95ha$

$\approx 2000ha$