GATE ES · 2025 · ES
Question 54: Groundwater Resources
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Question 54
ESNAT2 marksNeeds review
A homogeneous isotropic confined aquifer of uniform thickness 30 m has hydraulic conductivity of 5 m/day and porosity of 0.3. There are two observation wells X and Y along a radial line from a fully penetrating pumping well at 100 m and 200 m distance, respectively. The well is pumped at a uniform rate to produce steady drawdown of 5 m at X and 3 m at Y. If a non-reactive pollutant enters at the observation well Y, then the time taken by the pollutant (under advection) to reach the observation well X is __________ days. (rounded off to two decimal places)
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2025ES
GATE ES 2025 · Paper 1
Environmental Science and Engineering · Original paper archive
- Section
- Environmental Science and Engineering
- Question type
- Numerical answer (NAT)
- Marks
- 2 marks
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