The concept of scarcity is somewhat ambiguous and complex to be defined as it implies different dimensions or facets. First, scarcity needs to be understood as a relative concept, i.e., an imbalance between “supply” and “demand” that varies according to local conditions. Second, water scarcity is fundamentally dynamic. It intensifies with increasing demand by users and with the decreasing quantity and quality of the resource. It can further decrease when the right response options are put in place.

There are several dimensions of water scarcity that can be summarized as follows: (i) scarcity in the availability of fresh water of acceptable quality with respect to aggregated demand, in the simple case of physical water shortage; (ii) scarcity in access to water services, because of the failure of institutions in place to ensure reliable supply of water to users; (iii) scarcity due to the lack of adequate infrastructure, irrespective of the level of water resources, due to financial constraints. In the last two cases, countries may have a relatively high level of water resources endowment, but are unable to capture and distribute them because of limited financial resources for infrastructure development or lack of institutional capacity to maintain and manage them appropriately.

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Source: http://www.fao.org/land-water/world-water-day-2021/water-scarcity/en/

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