Inlet
"1. Upstream side of any structure through which water may flow. 2. Structure admitting water supplies from the source or through an intake structure built upstream." (United Nations Publications, 2013)
Sources
United Nations Publications. "Glossary of Shared Water Resources (English-Arabic): Technical, Socioeconomic and Legal Terminology." (2013). DOI:https://dx.doi.org/10.18356/70b462ce-en