At the last main hole of building sewerage, ______ is provided.

What is the exposure limit of H2S in a day?

What is the depth of concrete required for half-round channels for surface drains?

What is the minimum diameter of the pipe used to collect black water?

H2S gas is denser than air.

Rain water from roofs can be allowed to flow through the house sewers.

________ should not be placed near water body.

What is the quantity of powder required in 1000 litres of water for sterilization?