Right of access to water WordNet 3.0 & Open English WordNet

Riparian water rights is a system for allocating water among those who possess land along its path. It has its origins in English common law. Wikipedia

Water right in water law refers to the right of a user to use water from a water source, e.g., a river, stream, pond or source of groundwater. Wikipedia

The legal right of a user to use water from a specific source Wikidata

The right of a person who owns the land by a river, stream or creek to have access to and use of the shore and water. Depending on jurisdiction, this may include fishing rights and/or the right to use the water for domestic and garden purposes. Wiktionary