Water Quality Index Rechner — Formel
## How to Calculate Water Quality Index
The WQI combines multiple water quality parameters into a single score.
### Formula
**WQI = DO(0.30) + pH(0.15) + Turbidity(0.20) + Temp(0.15) + Nutrients(0.20)**
### Rating Scale
- **90-100**: Excellent
- **70-89**: Good
- **50-69**: Medium
- **25-49**: Bad
- **0-24**: Very Bad
Each parameter is first converted to a 0-100 sub-index score based on its measured value.
The WQI combines multiple water quality parameters into a single score.
### Formula
**WQI = DO(0.30) + pH(0.15) + Turbidity(0.20) + Temp(0.15) + Nutrients(0.20)**
### Rating Scale
- **90-100**: Excellent
- **70-89**: Good
- **50-69**: Medium
- **25-49**: Bad
- **0-24**: Very Bad
Each parameter is first converted to a 0-100 sub-index score based on its measured value.
Lösungsbeispiel
A water body with DO=75, pH=80, Turbidity=70, Temperature=85, Nutrients=65.
- DO: 75 * 0.30 = 22.5
- pH: 80 * 0.15 = 12.0
- Turbidity: 70 * 0.20 = 14.0
- Temperature: 85 * 0.15 = 12.75
- Nutrients: 65 * 0.20 = 13.0
- WQI = 22.5 + 12.0 + 14.0 + 12.75 + 13.0 = 74.3 (Good)