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

Two reservoirs differ by 20 m in water levels and are connected through a confined aquifer (thickness = 5 m, length = 2 km, hydraulic conductivity $K = 3\times10^{-3}$ m/s, porosity $\eta = 0.3$). If Reservoir 1 is contaminated, the time (in days, rounded off to one decimal place) taken by the pollutant to reach Reservoir 2 by advection is __________.
An isolated 3-hour storm occurred over a catchment.
Given the $\phi$–index and rainfall data, compute the total rainfall excess (rounded off to one decimal place).
Two reservoirs differ by 10 m in water surface elevation and are connected by a 50 m long, 10 cm diameter pipeline (friction factor $f = 0.02$). If the last 25 m is replaced with a 20 cm diameter pipe of the same material, the increase in discharge (in %, rounded to one decimal place) is:
Find the depth of flow (in m, rounded to two decimals) in a hydraulically efficient rectangular channel ($n = 1/80$) carrying 64 m$^3$/s at slope $S = 0.01$.
The following figure shows a 2-hour unit hydrograph (1 cm rainfall excess) for a catchment area of 540 hectare. Find the peak discharge (in m$^3$/s, rounded to one decimal place).
The correct order of hydraulic conductivity for the geologic formations is
Centrifugal pumps with suction pipe (shown by solid arrow) and delivery pipe (shown by dotted arrow) are shown in the figures. Choose the option that gives the correct connection.
Consider the following statements:
Statement 1: Goodrich method for reservoir routing is based on hydrologic flood routing method.
Statement 2: Muskingum method for channel routing is based on hydraulic flood routing method.
Which one of the following is correct?