A series of siphon pipes of uniform diameter are to draw water to irrigate the farm instead of using the traditional method of flooding the area.

A series of siphon pipes of uniform diameter are to draw water to irrigate the farm instead of using the traditional method of flooding the area. The pressure head at the summit of the siphon (considering the datum line at discharge end and neglecting head loss) is equal to:

In an open channel flow, the discharge at a certain section can be measured by the use of the weir, given by the equation: $Q = \frac{8}{15}C \sqrt{2g} ~ \tan (\frac{1}{2}\theta) ~ H^{5/2}$

In an open channel flow, the discharge at a certain section can be measured by the use of the weir, given by the equation:
 

$Q = \frac{8}{15}C \sqrt{2g} ~ \tan (\frac{1}{2}\theta) ~ H^{5/2}$

 

where Q is the discharge, C is the coefficient of discharge, H is the head, g is gravitational acceleration. This formula is for: