GATE 2026 AG – Question 34
A tile drainage system with drainage coefficient 25 mm drains $0.2\,\mathrm{km^2}$. Find average discharge in $\mathrm{m^3/s}$,to three decimals.
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Correct answer: 0.055 to 0.060
Explanation
The standard drainage coefficient means depth removed per day. Area is $0.2\times10^6=200000$ m²,so daily drainage volume is $0.025(200000)=5000$ m³/day. Divide by 86400 s/day:$Q=0.0578704$ m³/s, rounded **0.058**. The daily time basis is implicit in the printed coefficient.