List of top Water & Wastewater Treatment and Management Questions on Groundwater Flow asked in GATE ES

If \( d \) is the depth of an aquifer through which water is flowing, then the relationship between permeability \( K \) and transmissibility (also known as transmissivity) \( T \) is given by _______.
In a field test of a geological formation of permeable soil (porosity = 20 %), the hydraulic gradient was found to be 2 %. The actual seepage velocity of the flow was found to be 0.0025 m/s. Assume that the flow is in the laminar regime. The permeability \( K \) of the aquifer is _______ m/s (rounded off to three decimal places).
A water jet discharging from a 4 cm diameter orifice has a diameter of 3.5 cm at its vena contracta. The coefficient of velocity is defined as the ratio of the actual velocity of the jet at vena contracta to the theoretical velocity of the jet. If the coefficient of velocity is 0.98, the coefficient of discharge for the orifice will be _______ (rounded off to two decimal places).