Question

Match List-I (Main provision) with List-II (Surplussing arrangement) and select the correct answer using the codes below the lists:

List-I
A. Minor irrigation work
B. Medium irrigation project in interior area
C. Earth dam across main river
D. Masonry dam on good rock

List-II
1. Saddle spillway
2. Syphon spillway
3. Ogee spillway
4. Surplus weir

Codes:
A B C D

• A. 4 2 1 3
• B. 4 2 3 1
• C. 2 4 3 1
• D. 2 4 1 3

Answer 1

The correct option is A 4 2 1 3

Straight drop spillway or overall spillway may be constructed on small bunds or on thin arch dams etc. Ogee or overflow spillway is widely used with concrete, masonry, arch and buttress dams.
For earthen and rockfill dams a separate spillway is generally constructed in a flank or a saddle away from the main valley. It is also called chute or trough spillway.
Schemes involving-cultivable command area (CCA) upto 2000 ha are minor irrigation schemes; those involving CCA between 2000 to 10,000 ha are medium irrigation schemes; and those involving CCA greater than 10,000 ha are major irrigation schemes.
A surplus weir is a masonry weir with its crest level equal to full tank level. It is used in tank irrigation (minor irrigation schemes).
Syphon spillway is provided within the body of the gravity dam in medium or major irrigation projects.