# GATE Questions & Answers of ground water hydrology - steady state well hydraulics and aquifers

## What is the Weightage of ground water hydrology - steady state well hydraulics and aquifers in GATE Exam?

Total 4 Questions have been asked from ground water hydrology - steady state well hydraulics and aquifers topic of Hydrology subject in previous GATE papers. Average marks 1.25.

Dupuit’s assumptions are valid for

Water table of an aquifer drops by 100 cm over an area of 1000 km2. The porosity and specific retention of the aquifer material are 25% and 5%, respectively. The amount of water (expressed in km3) drained out from the area is _________

The relationship between porosity ($\eta$), specific yield (Sy) and specific retention (Sr) of an unconfined aquifer is: