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Module 4 - Construction of a gravity fed system

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→ Circular tank<br />

- Horizontal reinforcement by sections <strong>of</strong> 1 meter starting from the top<br />

Wall thickness (cm)<br />

Diameter (m)<br />

10 cm<br />

1.5 - 2 m<br />

10 cm<br />

2 – 2.5 m<br />

10 cm<br />

2.5 - 3 m<br />

10 cm<br />

4.5 - 5 m<br />

10 cm<br />

6 m<br />

Height* (m)<br />

Diameter <strong>of</strong> irons used (mm) and mesh (cm)<br />

0 – 1 m Ø8 / 25 Ø8 / 25 Ø8 / 25 Ø8 / 25 Ø8 / 25<br />

1 – 2 m Ø8 / 25 Ø8 / 25 Ø8 / 25 Ø8 / 15 Ø10 / 17.5<br />

2 – 3 m Ø8 / 15 Ø8 / 15 Ø10 / 12.5 Ø12 / 15<br />

3 – 4 m Ø8 / 15 Ø12 / 12.5 Ø12 / 10<br />

* by choosing a given height we can calculate easily the tank capacity:<br />

capacity = height x 3.14 x r 2 = height x 3.14 x diameter 2 / 4<br />

Standard examples <strong>of</strong> tank capacity are given to the following table:<br />

Capacity (m 3 ) 2 5 10 45 90<br />

Height (m) 1 1.45 1.7 2.65 3.25<br />

Diameter (m) 1.75 2.25 2.75 4.75 6<br />

- Vertical Reinforcement (distribution reinforcement)<br />

• Bottom <strong>of</strong> the tank to the middle height Ø8 / 10 cm<br />

• From middle height to the above <strong>of</strong> tank Ø8 / 20 cm<br />

In practice, you just have to stop one steel bar out <strong>of</strong> two starting from half way up.<br />

- Apron reinforcement<br />

Ø6 / 15 cm – square mesh or Ø8 / 30 cm – square mesh<br />

- Cover slab reinforcement<br />

Internal diameter <strong>of</strong> tank<br />

(m)<br />

Diameter <strong>of</strong> reinforced<br />

concrete (mm)<br />

Mesh<br />

(cm)<br />

2 m Ø 6 25 cm 8 cm<br />

3 m Ø 6 17 cm 8 cm<br />

4 m Ø 8 17 cm 10 cm<br />

5 m Ø 8 10 cm 10 cm<br />

6 m Ø 10 11 cm 10 cm<br />

Slab thickness<br />

(cm)<br />

17

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