Classification of Surface Water Quality
The field of hydrometry classifies surface water quality into five categories:
- Class 1 is extra-clean fresh surface water resource used for conservation, not necessarily required to pass through a water treatment process, and requiring only an ordinary process for pathogenic destruction and ecosystem conservation where basic organisms can breed naturally.
- Class 2 is very clean fresh surface water resource used for consumption, which requires an ordinary water treatment process before use, for aquatic organism of conservation, fisheries, and recreation.
- Class 3 is medium-clean fresh surface water resource used for consumption, which requires passing through an ordinary treatment process before use for agriculture.
- Class 4 is fairly clean fresh surface water resource used for consumption, but requires a special water treatment process before use for industry.
- Class 5 is the source which is not classified in class 1-4 and used only for navigation.
Definition: Surface water is taken from the lakes, rivers, waterfalls and sea. It plays the largest role of shaping the geography of land.
Read more about this topic: Surface Water
Famous quotes containing the words surface, water and/or quality:
“All the aspects of this desert are beautiful, whether you behold it in fair weather or foul, or when the sun is just breaking out after a storm, and shining on its moist surface in the distance, it is so white, and pure, and level, and each slight inequality and track is so distinctly revealed; and when your eyes slide off this, they fall on the ocean.”
—Henry David Thoreau (1817–1862)
“We then entered another swamp, at a necessarily slow pace, where the walking was worse than ever, not only on account of the water, but the fallen timber, which often obliterated the indistinct trail entirely. The fallen trees were so numerous, that for long distances the route was through a succession of small yards, where we climbed over fences as high as our heads, down into water often up to our knees, and then over another fence into a second yard, and so on.”
—Henry David Thoreau (1817–1862)
“As the quality of water changes with the nature of the soil;
So will a man’s reason vary with the quality of his friends.”
—Tiruvalluvar (c. 5th century A.D.)