## Canal Head & Drainage & Seepage Theory Question For GATE

Canal Head & Drainage & Seepage Theory Question For GATE In the dynamic world of civil engineering, navigating the GATE examination requires a deep understanding of canal dynamics. Join us in this exploration of essential questions, focusing on Canal Head works, Drainage works, and Seepage Theory, to fortify your knowledge base and position yourself for success

## one mark questions

**Q 1)** Profile of a weir on permeable foundation is shown in figure I and an elementary profile 'upstream pile only case' according to Khosla's theory is shown in figure II. The uplift pressure heads at key points Q, R and S are 3.14 m, 2.75 m and 0 m, respectively (refer figure Il).

What is the uplift pressure head at point P downstream of the weir (junction of floor and pile as shown in the figure I)?

(a) 2.75 m

(b) 1.25 m

(c) 0.8 m

(d) Data not sufficient

**[GATE-2016 SET-II]**

**Q 2)** The ratio of the rate of change of discharge of an outlet to rate of change of discharge of the parent channel is defined as__________?

**[GATE-1994]**

**Q 3)** When a canal is passed under the drainage such that the full supply level of the canal does not touch the underside of the supporting structure, the cross drainage work is called

a________?

**[GATE-1994]**

**Q 4)** For the head regulator, the most severe condition of uplift pressure on the floor occurs when

(a) the flow in the river is at flood level and canal is running at full supply depth

(b) the canal runs and the river flow is at high flood level.

(c) the canal runs at full supply depth and the river flow is at pond level

(d) the canal runs dry and the river flow is pond level

**[GATE-1992]**

**Q 5)** In a syphon aqueduct, the most severe condition of uplift on the floor occurs when

(a) the canal and drainage run full

(b) the canal runs full; the drainage channel is dry, and the water table is at the stream bed.

(c) the canal is dry, the drainage floor is at HFL, and the water table is at the HFL of the drainage flow

(d) the canal runs full; and the drainage is dry

**[GATE-1991)**

## Two Marks Questions

**Q 6)** Group I contains three broad classes of irrigation supply canal outlets. Group Il presents hydraulic performance attributes.

Group I | Group II |

P. Non - Modular Outlet | 1. Outlet discharge depends outlet on the water levels in both the supply canal as well as the receiving water course |

Q. Semi- Modern Outlet | 2. Outlet discharge is fixed and is independent of the water levels in both the supply canal as well as the receiving water course |

R. Modular Outlet | 3. Outlet discharge depends only on the water level in the supply canal. |

Outlet discharge depends only on the water level in the supply canal.

(a) P-1; Q-2; R-3

(b) P-3; Q-1; R-2

(c) P-2; Q-3; R-1

(d) P-1; Q-3; R-2

**[GATE-2017 SET-I]**

**Q 7)** A weir on a permeable foundation with downstream sheet pile is shown in the figure below. The exit gradient as per Khosla's method is

(a) 1 in 6.0

(b) 1 in 5.0

(c) 1 in 3.4

(d) 1 in 2.5

**[GATE-2008]**

**Q 8)** Uplift pressures at points E and D (Fig. A) of a straight horizontal floor of negligible thickness with a sheet pile at downstream end are 28% and 20%, respectively. If the sheet pile is at upstream end of the floor (Fig. B), the uplift pressures at points D_{1} and C_{1} are

(a) 68% and 60% respectively

(b) 80% and 72% respectively

(c) 88% and 70% respectively

(d) 100% and zero respectively

**[GATE-2005]**

**Q 9)** While designing a hydraulic structure, the piezometric head at bottom of the floor is computed as 10 m. The datum is 3m below floor bottom.. The assumed standing water depth above the floor is 2 m. The specific gravity of the floor material is 2.5. The floor thickness

(a) 2.00 m

(b) 3.33 m

(c) 4.40 m

(a) 6.00 m

**[GATE-2003]**

**Q 10)** In connection with the design of a barrage, identify the correct matching of the criteria of design with the items of design.

**Item of design**

- (i) Width of waterway
- (ii) Level and length of downstream floor.
- (iii) Depth of sheet piles and total length of barrage floor
- (iv) Barrage floor thickness

**Criteria of design**

- (A) Scour depth and exit gradient
- (B) Lacey's formula for wetted perimeter and discharge capacity of the barrage as computed by weir equations
- (C) Uplift pressure variation
- (D) Hydraulic jump considerations

(i) | (ii) | (iii) | (iv) | |

(a) | A | B | C | D |

(b) | D | C | B | A |

(c) | B | A | D | C |

(d) | B | D | A | C |

**[GATE-1998]**

## Five Marks Questions

**Q 11)** The cross-section of a weir is shown in below figure. Relative density of concrete is 2.5 Match the following

- P. uplift pressure head as per Bligh's theory
- Q. uplift pressure head as per Lane's theory
- R. thickness of floor as per Bligh's theory
- S. thickness of floor as per Lane's theory

- 1. 0.67 m
- 2. 0.645 m
- 3. 1.676 m
- 4. 1.612 m

P | Q | R | S | |

(a) | 4 | 1 | 2 | 3 |

(b) | 1 | 3 | 2 | 4 |

(c) | 4 | 3 | 2 | 1 |

(d) | 4 | 3 | 1 | 2 |

**[GATE-1996]**

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