Aquaculture Engineering

Design of Canals - Design of feeder channel

Unit 11 - Water distribution and control structures

Design of Canals

Design of feeder channel
The feeder channels used in an aqua-cultural farm are either lined channels and build up channels (i.e, flume) or unlined channels. While lined channels and built up channels are non-erodible and can with stand the erosion satisfactorily, unlined channels are generally erodible.

However for design purpose, the most economical section is always designed. For maximum discharge through a rectangular section for a most economical rectangular channel section b = 2d and

For maximum discharge through a trapezoidal section i.e., for a most economical trapezoidal channel section

For maximum discharge though a circular channel i.e., for a most economical circular channel section.
d = 0.95 D
Where,
d = Depth of flow
B = Base width
k = Side slope (i.e., 1 vertical to k horizontal)
D = Diameter of circular pipe

Dimensions of the most economical channel section can be easily computed in the following steps.