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Why is proportional flow weir provided in a grit chamber ?

Why is proportional flow weir provided in a grit chamber ? Correct Answer To maintain constant flow velocity in the grit chamber over a certain depth range

Explanation:

Grit chambers:

(i) These are long narrow rectangular channel with an increased cross-sectional dimension which decelerate flow and allow grit to settle.

(ii) These units are provided in order to carry out the removal of inorganic suspended solid and to pass forward the suspended solid in PST.

(iii) These chamber are designed in the form of long channel, which may either be rectangular or parabolic in cross-section.

(iv) The grit chamber is a settling tank with a provision to control flow velocity.

(v) A velocity control device known as proportional weir flow and parshall flume is provided at the outlet of the grit chamber to maintain constant flow velocity irrespective of the flow rate.

(vi) If rectungar section is adopted, proportional weir is provided infront of it and if parabolic section is adopted, pashall flume is provided infront of it.

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