WHO Technical Note for Emergencies 9: How much water is needed in emergencies

Water is essential for life, health and human dignity. In extreme situations, there may not be sufficient water available to meet basic needs and in these cases, supplying a level of safe drinking water for survival is of critical importance. Insufficient water and the consumption of contaminated water are usually the first and main causes of ill health to affect displaced populations during and after a disaster.
 
This techical notes considers the minimum quantities of water that are required for survival in emergencies.

Contents:

Factors affecting water requirements

The Sphere Standards

How much water does an individual use

Priorities for water

Water sources and quality

Sanitation and water requirement

Accessibility

Water for non-domestic use

Step-by-step improvements

Calculating water demand

Ensuring supply has an impact