Which of the following is not correct with respect to installing the drainage system in the waterlogged land?

What is the exposure limit of H2S in a day?

What is the chemical used to prevent H2S gas formation from Ferric chloride?

When was SWMM developed?

What is the minimum depth of water seal in floor trap?

What is the flow velocity condition required for the formation of hydrogen sulphide?

Which year was the SWMM approved?

Submersible pumps require high maintenance.