Recommendations

Sedimentation tank stilling walls Settling tank: hydraulic superficial loading rate Rectangular section trough Conventional settling tank: triangular weirs at the edges of the settled water troughs Conventional settling tank: horizontal flow velocity

Caixa de areia para água

Default

Input data

Flow (Q)

Depth (y)

Width (b)

Length (L)

Output data

Q/A

Settling critical velocity (vs)

Horizontal velocity (U)

Description

Calculates grit chamber installations for water intake structures in rivers.

Given the flow and the grit chamber dimensions, calculates the superficial flow rate, the settling critical velocity and the horizontal velocity.

Notes:

According to Brazilian standards, the critical sedimentation velocity must be equal or less than 2.4 cm/s.
According to Brazilian standards, the actual lenght of the grit chamber (L) must be equal to the theoretical lenght multiplied by 1.5.
According to Brazilian standards, maximum horizontal velocity shall not be greater than 0,30 m/s.

Caixa de areia para água

References

VIANNA, Marcos R. Hidráulica aplicada às estações de tratamento de água. 6. Ed. Belo Horizonte, 3I, 2019.