Which day of the year is celebrated as Water Day?

Name the scraper that removes solids like forced from the wastewater.

The process of seeping water into the ground is called

The ground water-bearing layer of the earth which is below the water table is?

The traditional way of collecting water was

Which of the following is the step of wastewater treatment?

This method of irrigation can minimise wastage of water:

The aerobic bacteria can be grown in clarified water by

Which of the following is not an inorganic impurity present in sewage?