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Figure shown below represents a symbol ‘A’, it signifies?

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Figure shown below represents a symbol ‘A’, it signifies?

(a) Septic tank

(b) Soak pit

(c) Gutter

(d) Water storing tank

I have been asked this question in my homework.

Question is from Design of Septic Tanks topic in portion Road Estimating, Sanitary and Water Supply Work of Civil Engineering Drawing

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The correct option is (a) Septic tank

Easiest explanation: A septic tank collects and treats wastewater at a property that is not connected to the mains sewer system. Installed underground, a septic tank makes use of natural processes to treat the sewage it stores. Usually made up of two chambers or compartments, the tank receives wastewater from an inlet pipe. Wastewater enters the first chamber and separates over time, with solids settling at the bottom, oils and greases forming a layer of scum at the top, and a layer of relatively clear water remaining in the middle.

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