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Question
A tile drainage system draining 12 hectares, flows at a design capacity for two days, following a storm. If the system is designed using a drainage coefficient of 1.25 cm, how much of water will be removed during this period?
A.
1500 m3
B.
4500 m3
C.
3000 m3
D.
3500 m3
Answer ( Option C)

3000 m3

Solution

Drainage coefficient (D.C.) : Drainage coefficient is defined as the depth of water to be removed in 24 hours from the entire drainage area.  
Given: 
Area = 12 heaters = 12 × 104 m2 
D.C. = 1.25 cm (i.e. Depth of water removed per day)
Water removed period = 2 days
Hence, Volume of water drained in two days = 2 × 1.25 × 10–2 × 12 × 104 = 3000 m3 
Hence, option (c) is correct answer.

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