Question
Download Solution PDFSelf-purification constant of impounding reservoirs varies between:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Self-purification of the running stream:
When the sewage effluent is disposed of in a river stream it undergoes the process of self-purification by the following natural mechanism
- Dilution & Dispersion
- Sedimentation
- Sunlight
- Oxidation & Reduction
The self-purification factor, f of different water bodies @ 20° C
| Description of water bodies | Range |
| Small ponds and backwaters | 0.5-1 |
| Sluggish streams, large lakes, and impounding reservoirs | 1-1.5 |
| Large stream of low-velocity | 1.5-2 |
| Large stream of normal velocity | 2-3 |
| Swift stream | 3-5 |
| Rapids and water falls | over 5 |
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