Question

For a saddle siphon, the maximum operative head is 6.25 m. The width and height of the throat of the siphon are 4 m and 2 m respectively. The coefficient of discharge is 0.90. How many units are required to pass a flood of 300 cumec?(Take g = 10 m/s${}^2$)

• A. One
• B. Two
• C. Three
• D. Four

Answer 1

The correct option is D Four

The discharge through one unit,

$Q=C_{d}A\sqrt{2gh}$

$=0.90\times (4\times 2)\times \sqrt{2\times 10\times 6.25}$

$=80.5m^3/s$

Thus number of units needed

$=\frac{300}{80.5}\simeq 4$