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

Which of these is negative effect owing to the drier soil conditions?

What is the recommended slope ratio for soil water pipes?

What is the minimum diameter of pipes used for drainage of waste water?

_______ is generally used in food processing units.

What is the odour threshold limit of H2S gas?

________ should not be placed near water body.

Grease should not be allowed to enter the normal drainage system.