Supernatant Water

Health Hygiene & Sanitation

Lesson 26 : Water Purification


Supernatant Water

The water above sand bed is called supernatant water. The depth varies from 1 to 1.5 metre. The purposes of supernatant water are:

  • To provide constant head of water so that resistance of the filter can be overcome and downward flow of water can be promoted;

  • To provide waiting period (3 to 12 hours) for raw water to undergo partial purification by sedimentation, oxidation and particle agglomeration.

The level of supernatant water is always kept constant.

Last modified: Wednesday, 25 April 2012, 9:39 AM