Which of the following is a semi-modular canal outlet?
An outlet is a small structure that admits water from the distributing channel to a water course of the field channel. Thus, an outlet is a sort of head regulator for the field channel delivering water to the irrigation fields.
Types of outlet
Outlets may be classified under the following there heads :
1. Non-modular Outlet
2. Semi-module or Flexible Module
3. Rigid Module.
Non-modular Outlet:- A non-modular outlet is one in which the discharge depends upon the difference in level between the water levels in the distributing channel and the water course.
Semi-module or Flexible outlet:- A flexible outlet or semi-module is one in which the discharge is affected by the fluctuations in the water level of the distributing channel while the fluctuations in the water levels of the field channel do not have any effect on its discharge. The various outlets in common use that fall under this category are pipe outlets, Kennedy’s gauge outlets, Crump’s open flume outlets, and pipe-cum open flume outlets.
Rigid Module:- A rigid module is one that maintains constant discharge, within limits, irrespective of the fluctuations in water levels in the distributing channel and/or field channel. Gibb's rigid module is the most common outlet that falls under this category.