List of top Water Resources and Environmental Hydraulics Questions asked in GATE Environmental Science and Engineering

With reference to the gate shown in the figure, the gate will start opening automatically when the water level 'h' above the hinge is ________ m (rounded off to 2 decimal places).

Consider a watershed and isohyets as shown in the figure. The average rainfall in the watershed is __________ mm (an integer value).

Water is flowing FULL through a rectangular tunnel of size 3 m (width) × 2 m (height). The average velocity of flow is 1 m/s. The frictional head loss is observed to be 1 m per km. Consider acceleration due to gravity (g) as 10 \(m/s^2\). The correct statement(s) is/are

Consider two horizontal layers of an aquifer as shown in figure. Each layer is isotropic and homogeneous. Flow is parallel to the stratification. Thickness and horizontal hydraulic conductivity of layer-1 are $h_1$i and $K_1$, respectively. Thickness and horizontal hydraulic conductivity of layer-2 are $h_2$ and $K_2$, respectively, where $h_1$ is not equal to $h_2$. The equivalent horizontal conductivity $K_x$ for the aquifer system is given by _____

Consider second order kinetics ($r = −kC^2$) under steady state condition. The ratio of volume of a complete mixed reactor (CMR) to that of a plug flow reactor (PFR) to achieve 90% reduction in the concentration is _______ .
Inlet concentrations in both the reactors are same.

In the context of fluid flow, which of the following statement(s) is/are correct?

In a rectangular open channel, the flow is critical, and the flow depth is 2 m. Select the correct statement(s)