Physical water scarcity
Physical water scarcity occurs when available water resources are insufficient to meet demands while maintaining required environmental flows. Applying Physical water scarcity requires a stated place, ecological condition, water or land unit, affected stakeholders, and assessment timescale. Those choices determine how Physical water scarcity can be compared or acted upon.
In simple terms
In practical use, Physical water scarcity occurs when available water resources are insufficient to meet demands while maintaining required environmental flows. For Physical water scarcity, assessment should identify the driver, exposure, affected people or assets, likelihood, consequence, and available response within a declared place, ecological condition, water or land unit, affected stakeholders, and assessment timescale. Physical water scarcity connects with Water scarcity and Biodiversity offset; each can affect its application without sharing its definition. The candidate link between Physical water scarcity and Protected area remains a separate expansion question supported here by Food and Agriculture Organization of the United Nations.
Why it matters
Physical water scarcity matters because decisions about it determine which ecological condition is used as the baseline, whose water or land interests count, and whether an intervention fits its location. A defensible use of Physical water scarcity therefore exposes its boundary, method, evidence, responsible actor, and uncertainty before a conclusion is accepted. That discipline keeps Water scarcity and Biodiversity offset from being treated as proof of Physical water scarcity when their criteria, scope, or results differ.
Example
A site and landscape team evaluates Physical water scarcity for a defined decision and records the relevant place, ecological condition, water or land unit, affected stakeholders, and assessment timescale. For Physical water scarcity, the team uses cited material from Food and Agriculture Organization of the United Nations to identify the exposure, affected people or assets, and available response, documenting the period, data, assumptions, and comparison with Water scarcity. It treats Biodiversity offset and Protected area as separate questions rather than proxies for Physical water scarcity.
How it differs
Water scarcity
Physical water scarcity is a issue or risk; Water scarcity has a different function. Evidence for Water scarcity does not establish Physical water scarcity unless both sets of applicable criteria are met.