Types of Cross Drainage Structures

Q. Superpassage is a canal cross-drainage structure in which

1. canal water flows under pressure below a natural stream
2. natural stream water flows under pressure below a canal
3. natural stream water flows with free surface below a canal
4. canal water flows with free surface below a natural stream.

Q. What type of cross drainage work is provided when the canal runs below the drain, with FSL of canal well below the bed of the drain?

1. Aqueduct
2. Super passage
3. Level crossing
4. Siphon aqueduct

Q. A cross drainage structure in which natural drain is carried over the canal and full supply level of canal is higher than that of bed of natural drain is called :

1. Syphon aqueduct
2. Super passage
3. Syphon
4. Aqueduct

Q. When an irrigation canal is taken sufficiently above a drainage channel, the cross- drainage is called

1. Aqueduct
2. Super passage
3. Syphon Aqueduct
4. Syphon

Q. If the path of an irrigation canal is below the level of a natural stream, the type of cross-drainage structure provided is

1. Aqueduct
2. Super passage
3. Sluice gate
4. Level crossing

Q. Match List-I (Relative position of canal and drainage channel) with List-II (Type of cross drainage work) and select the correct answer using the code given below the lists:
List-I
A. Canal taken above the drainage channel at its grade
B. Drainage channel taken above the canal at its bed slope
C. Canal taken below the drainage channel
D. Drainage channel taken below the canal
List-II
1. Canal siphon
2. Drainage siphon
3. Aqueduct
4. Super passage

1. A - 2, B - 4, C - 1, D - 3
2. A - 3, B - 1, C - 4, D - 2
3. A - 2, B - 1, C - 4, D - 3
4. A - 3, B - 4, C - 1, D - 2

Q. The following data pertain to a natural drain crossing an irrigation canal:
$\begin{array}{ccc}& \text{Canal data}& \text{Drainage data}\\ \text{Flow}& \text{10 cumecs}& \text{200 cumecs}\\ \text{Bed level}& 112m& 108m\\ \text{Depth of flow}& 1m& 8m\end{array}$
Which of the following type of cross drainage work should be recommended for the above case?

1. Aqueduct
2. Syphon aqueduct
3. Syphon
4. Super-passage

Q. List-I
A. Aqueduct

B. Level crossing

C. Super passage

D. Syphon

List-II
1. The drainage water is carried in a trough supported on piers while the irrigation canal passes below the drain with its FSL well below the slab level of the trough above.

2. The drainage water is carried in a trough supported on piers while the irrigation canal passes below the drain with its FSL above the slab level of the trough above.

3. The canal and the drain approach each practically at the same level.

4. The irrigation canal is carried across the drain in a trough supported on piers with the canal bed level well above the HFL of the drain.

1. $\begin{array}{cccc}\text{A}& \text{B}& \text{C}& \text{D}\\ 4& 3& 2& 1\end{array}$
2. $\begin{array}{cccc}\text{A}& \text{B}& \text{C}& \text{D}\\ 4& 3& 1& 2\end{array}$
3. $\begin{array}{cccc}\text{A}& \text{B}& \text{C}& \text{D}\\ 3& 4& 1& 2\end{array}$
4. $\begin{array}{cccc}\text{A}& \text{B}& \text{C}& \text{D}\\ 3& 4& 2& 1\end{array}$

Q. In a syphon aqueduct, the most severe condition of uplift on the floor occurs when

1. the canal and drainage runs full
2. the canal runs full; the drainage channel is dry, and the water table is at the stream bed
3. the canal is dry, the drainage floor is at HFL, and the water table is at the HFL of the drainage flow
4. the canal runs full; and the drainage is dry