DESIGN OF THE CANAL
In the design of a canal one has to find out bed width (B) depth (D), longitudinal slope (S), and velocity of flow (V).
If discharge (Q) and silt factor (f) are given, the method of finding.
This aspect limits only finding the sectional dimensions of the canal.
But how to compute the discharge ata particular reach is an important aspect of canal design.
Discharge in the off-taking canal does not remain constant throughout the length.
Outlets fixed on the canal at regular intervals draw discharge from the canal and supply it to the fields for irrigation.
Evaporation and percolation losses also go on increasing with length of the canal.
Hence because of discharge withdrawn by outlets, and also continuous evaporation and seepage losses.
The remaining discharge in the canal goes on decreasing as canal flows towards the tail.
As discharge at various points on the canal is not constant, the section of the canal will also be changing.
While fixing the discharge for any canal to be withdrawn from a head regulator, one must know the following data.
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