Which principle allows the first person to utilize water to have priority over later claims?

The principle that allows the first person to utilize water to have priority over later claims is known as "first in time, first in right." This principle establishes that the rights to water use are granted based on the order of claims; the first individual or entity to divert or use the water has the right to continue using it against later users. It is foundational in many water law systems, especially in the context of prior appropriation, which is significant in arid regions where water access is limited and must be managed carefully. This principle ensures that those who have historically used the water maintain their rights, promoting stability and predictability in water resource management.

Other concepts mentioned, such as community allocation or collective ownership, do not prioritize individual claims based on time of establishment but rather suggest a shared or communal approach to resource management. These approaches may be applied in different contexts but do not align with the foundational priority established by the first in time, first in right principle.