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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 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 ? Correct Answer 3000 m<span style="position: relative; line-height: 0; vertical-align: baseline; top: -0.5em;font-size:10.5px;">3</span>

Concept:

The drainage coefficient is defined as the depth of water to be removed in 24 hours from the entire drainage area.

  • It is used for the design of drainage systems for agricultural lands.
  • In agricultural lands, open ditches or drains are the most commonly used surface drainage structures.
  • The rate at which the open drains should remove water from a drainage area depends on:
    • Rainfall
    • Size of the drainage area
    • Characteristics of the drainage area
    • Nature of the crops grown
    • The degree of protection required for them from waterlogging

​Calculation:

Given:

Drainage coefficient = 1.25 cm ( i.e Depth of water removed per day)

Area = 12 ha = 120000 m2

(1 ha = 10000 m2)

Water removal period = 2 days

The volume of water removed = Drainage coefficient × Area × Time = (1.25/100) × 120000 × 2 = 3000 m3

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