(Solved): Designing a long-rectangular settling basin for type-2 settling: A city must treat about \( 15000 \ ...

Designing a long-rectangular settling basin for type-2 settling: A city must treat about \( 15000 \mathrm{~m}^{3} / \mathrm{d} \) of water. Flocculating particles are produced by coagulation, and a column analysis indicates that an overflow rate of \( 20 \mathrm{~m} / \mathrm{d} \) will produce satisfactory removal at a depth of \( 3.5 \mathrm{~m} \). Determine the size of the required tank (and dimensions from volume), retention time, and horizontal velocity.