GATE CE 2026 Set 1 — Question 65
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Environmental Engineering → Drinking Water Treatment → Sedimentation
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Question
The maximum demand at a water purification plant has been estimated as 12 million litres per day. For the raw supplies, a rectangular sedimentation tank is to be designed with mechanical sludge removal arrangement. Consider depth of the tank as 4 m, detention period as 6 hours, and velocity of flow as 0.003 m/s.The width (in m) of the detention tank is _________ (rounded off to two decimal places).
Correct answer
11 to 12
Solution
Given:
Maximum demand, MLD L/day
Convert to :
Detention period, hours
Velocity of flow,
Depth of tank, Step 1: Calculate the volume () of the tank.
Step 2: Calculate the length () of the tank using velocity of flow.
Step 3: Calculate the width () of the tank.
Alternatively, using cross-sectional area ():
Rounding off to two decimal places, the width is m.
Maximum demand, MLD L/day
Convert to :
Detention period, hours
Velocity of flow,
Depth of tank, Step 1: Calculate the volume () of the tank.
Step 2: Calculate the length () of the tank using velocity of flow.
Step 3: Calculate the width () of the tank.
Alternatively, using cross-sectional area ():
Rounding off to two decimal places, the width is m.
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