Water Stress Index Calculator
Calculate the water stress index for a region by comparing total water withdrawals to available renewable supply.
km³/yr
km³/yr
Water Stress Ratio
0.400
Stress Percentage40.0 %
Remaining Supply45.0 km³/yr
Water Stress Ratio vs Total Annual Withdrawals
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
Example Calculation
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