## Gravity Dams and Spillways in Irrigation Question For GATE

Gravity Dams and Spillways in Irrigation Question For GATE. In the realm of hydraulic engineering, the fusion of gravity dams and spillways forms the backbone of irrigation infrastructure. As GATE aspirants set sail on the waters of knowledge, this blog post serves as a compass, navigating through the intricacies of gravity dams and spillways, all while unveiling critical questions tailored for success in the GATE examination.

## one mark questions

**Q 1)** The base width of an elementary profile of a gravity dam of height H is b. The specific gravity of the material of the dam is G and uplift pressure coefficient is K. The correct relationship for no tension at the heel is given by

(a) (b/h) = 1/√(G-K)

(b) (b/h) = √(G-K)

(c) (b/h) = 1/(G-K)

(d) (b/h) = 1/ √K(G-K)

**[GATE-2008]**

**Q 2)** Which one of the following equations represents the downstream profile of Ogee spillway with vertical upstream face? [(x, y) are the coordinates of the point on the downstream profile with origin at the crest of the spillway and Hy is the design head].

(a) (y/H_{d}) = -0.5(x/H_{d})^{1.85}

(b) (y/H_{d}) = -0.5(x/H_{d})^{1/1.85}

(c) (y/H_{d}) = -2.0(x/H_{d})^{1.85}

(d) (y/H_{d}) = -2.0(x/H_{d})^{1/1.85}

**[GATE-2005]**

**Q 3)** A concrete gravity dam section is shown in the figure. Assuming unit weight of water as 10 kN/m^{3} and unit weight of concrete as 24 kN/m^{3} the uplift force per unit length of the dam (expressed in kN/m) at PQ is____?

**[GATE-2016 SET-I]**

**Q 4)** A launching apron is to be designed at downstream of a weir for discharge intensity of 6.5 m^{3}/s/m. For the design of launching aprons, the scour depth is taken two times of Lacey scour depth. The silt factor of the bed material is unity. If the tailwater depth is 4.4 m, the length of launching apron in the launched position is

(a) √5m

(b) 4.7 m

(c) 5 m

(d) 5√5 m

**[GATE-2005]**

## Five Marks Question

**Q 5)** Figure shows the section (non-overflow portion) of a straight gravity dam built with concrete. Considering water pressure and uplift pressure, and neglecting the other external forces acting on the dam, check whether the resultant passes through the middle third of the base for the reservoir full condition. In the figure, RL stands for Reduced Level in meters and MWL stands for Maximum Water Level. (Unit weight of water is 1000 kg/m^{3} and that of concrete is 2400 kg/m^{3})

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