Cost of the water supply project is depends on…

______ valves are used to remove sand and silt from the pipelines.

Which is the first zone of purification in a sand bed?

Colour of water is measured by ….

Water lost in theft and waste contributes to how much % of total consumption?

The Total hardness of soft water as CaCO₃ equivalent is __________

The bacterial removal efficiency of the rapid sand filter is ______ in comparison to slow sand filter.

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

 In which of the following distribution system, the clean water flows entirely under gravity?

Which system is also known as reticulated system or interlaced system?