Correct Answer - Option 3 : 0.30
Concept:
Proportionality and setting are some of the criteria by virtue of which the behaviour and functioning of a module can be judged.
Proportionality of a module/ canal outlet: An outlet is said to be proportional when the rate of change of discharge of the outlet is equal to the rate of change of discharge of the distributary channel.
Setting of a module/ canal outlet: The ratio of the depth of the water level of the outlet to the full supply depth of the distributary is known as setting.
Hence, setting of a proportional weir \(= {\rm{}}\frac{{{\rm{outlet\;index}}}}{{{\rm{channel\;index}}}}\)
Calculation:
Given, channel index = 5/3.
Outlet index for an orifice type outlet is = 1/2.
∴ Setting = \(\frac{{{\rm{outlet\;index}}}}{{{\rm{channel\;index}}}} = \frac{{\frac{1}{2}}}{{\frac{5}{3}}} = 0.3\)
Important Information:
Outlet index for an orifice type outlet is = 1/2.
Outlet index for a weir type outlet is = 3/2.
