水质指数计算器
使用水质指数计算器评估水体的综合质量等级。输入溶解氧、pH值、浊度和污染物浓度等参数，计算水质综合指数WQI，判断水体是否适合饮用或生态需求。
Water Quality Index
74.3 WQI
Water Quality Index vs Dissolved Oxygen Score
公式
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
Each parameter is first converted to a 0-100 sub-index score based on its measured value.
计算示例
A water body with DO=75, pH=80, Turbidity=70, Temperature=85, Nutrients=65.
- 01DO: 75 * 0.30 = 22.5
- 02pH: 80 * 0.15 = 12.0
- 03Turbidity: 70 * 0.20 = 14.0
- 04Temperature: 85 * 0.15 = 12.75
- 05Nutrients: 65 * 0.20 = 13.0
- 06WQI = 22.5 + 12.0 + 14.0 + 12.75 + 13.0 = 74.3 (Good)
常见问题
What does the WQI measure?
The Water Quality Index consolidates multiple measurements into a single number indicating overall water quality. Higher scores indicate better quality for aquatic life and human use.
Why is dissolved oxygen weighted most heavily?
Dissolved oxygen is the most critical parameter for aquatic life. Most fish need DO above 5 mg/L. Low DO indicates pollution and eutrophication.
What causes low water quality?
Common causes include nutrient runoff (fertilizers), sewage discharge, industrial pollution, sediment erosion, thermal pollution, and acid rain.