水资源压力指数计算器
使用水资源压力指数计算器评估区域水资源的供需紧张程度。输入可用水量和取水量数据，计算水资源压力指数，识别面临水危机风险的地区。
Water Stress Ratio
0.400
Water Stress Ratio vs Total Annual Withdrawals
公式
Water Stress Index
The water stress index measures how much of a region's available water is being used. Higher ratios indicate greater pressure on water resources.
Formula
Water Stress = Total Withdrawals / Renewable Supply
Thresholds
计算示例
A region withdraws 30 km³/year from a renewable supply of 75 km³/year.
- 01Stress ratio = 30 / 75 = 0.400
- 02Stress percentage = 40.0%
- 03Remaining supply = 75 - 30 = 45 km³/year
- 04At 40%, this region is at the high stress threshold
常见问题
What causes water stress?
Water stress results from growing demand (agriculture, industry, population) exceeding renewable supply, often worsened by drought, climate change, and poor management.
Which regions face the most water stress?
The Middle East, North Africa, South Asia, and parts of the American Southwest face the highest water stress. Over 2 billion people live in water-stressed regions.
Can water stress be reversed?
Yes, through efficiency improvements (drip irrigation, recycling), demand management, desalination, and watershed protection. Israel has reduced stress through aggressive water recycling.