Tributary and Inflows

Quick definition

A tributary is a smaller stream or river that flows into a larger one. “Inflow stream” is a plain-language way to describe the same idea.

What it means in practice
Tributaries control the timing, temperature, sediment, and nutrient flows of the main river. Protecting a river often requires protecting its inflows.

Why it matters for rights of nature
If a river has rights, those rights can be undermined by harms to headwaters, springs, and inflow streams.

See also
Watershed; Instream flow; Aquifer

Related Terms

Balancing of Interests

Balancing of interests means nature’s interests are included and weighed as legally cognizable interests – without assuming nature automatically wins every conflict.

Beneficial Use

Beneficial use is a water-law principle that ties water rights to recognized uses, rather than allowing water to be hoarded.

Cause of Action

A cause of action is the specific legal claim that lets a court hear your case, what law was violated and what the plaintiff is entitled to ask for.

Declaratory Judgment

A declaratory judgment is a court decision that clarifies legal rights and duties, declaring what the law means and how it applies, without necessarily ordering immediate action.

Due Process

Due process is the legal requirement that government actions affecting rights follow fair procedures, and in some contexts, be substantively fair.

Duty of Care

A duty of care is a legal obligation to act reasonably to avoid causing foreseeable harm.

Related updates

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Study sites. (a–c) Nanika catchment in Western British Columbia, Canada. (d–f) Krycklan catchment in the boreal region of northern Sweden. (a, d) Satellite images and boundaries of Nanika and Krycklan. The red circle and yellow square show the locations of the catchment outlet and streamflow measurement station, respectively. (b, e) Topographic map showing the elevational pattern of both catchments. Note the distinct elevational ranges in the two catchments. (c, f) The distribution of slopes in the two catchments, reflecting a larger portion of very steep locations (∼100% or 45°) in the Nanika vs. Krycklan. Slope and elevation maps were generated at 90-m and 30-m resolution for Nanika and Krycklan, respectively. Credit: Water Resources Research (2026). DOI: 10.1029/2025wr040679

What Lies Beneath: The Underground Life of Watersheds

January 27, 2026

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