Normal values of overflow rate for plain sedimentation tank using coagulants, is__________.

750 to 1000 litres/hr/m²

1000 to 1250 litres/hr/m²

1250 to 1500 litres/hr/m²

1500 litres/hr/m²

Correct Answer : 1000 to 1250 litres/hr/m²

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Normal values of overflow rate for plain sedimentation tanks in litres/hr/m², generally range between

100 to 250

250 to 500

500 to 750

750 to 1000

Correct Answer : Option (C) : 500 to 750

When gravity and pumping systems of water distribution are adopted, the type of distribution reservoir, is____.

intz tank

elevated tank

stand pipe

ground source reservoir

Correct Answer : Option (B) : elevated tank

If n is porosity, y is specific yield and r is specific retention of any soil, the relationship which holds good, is_____.

n + y = r

y + r = n

n + r + y = 0

n + y + r = 1

Correct Answer : Option (B) : y + r = n