Question

In a Sarda type fall, rectangular crest is used for discharge upto
1. 6 cumecs
2. 14 cumecs
3. 10 cumecs
4. 20 cumecs

Answer 1

Correct Answer - Option 2 : 14 cumecs

Concepts:

Sarda type fall is constructed on Sarda canal in Uttar Pradesh. It is the combination of small-sized falls resulting in gradual energy dissipation of the water without hydraulic jump formation.

It is a fall with raised crest and with vertical impact. The soils in Sarda command comprised sandy stratum overlain by sandy-clay on which depth of cutting was to be kept minimum.

Design Characteristics of Sarda Fall are:

1. Discharge intensity varied from 1.6 to 3.5 cumec/s.
2. Drop varied from 0.6 to 2.5 m.
3. When the discharge of a canal is less than 14 cumec/s, the section of the body wall is kept rectangular.
4. When the discharge of a canal is more than 14 cumec/s, the section of the body wall is kept trapezoidal with upstream batter 1: 3 and downstream batter 1: 8.
5. The depth of cut-off may range from 1 to 1.5 m.