Definition
In Roman civil law, a trench, ditch, or excavation made alongside or through a watercourse. The term refers to a place cut into stone or earth adjacent to a stream — typically an artificial channel, diversion, or collection point associated with water management. The scope of the term extended beyond trenches in the narrow sense to encompass related excavations, including ditches (fossae) and wells (putei).
The word derives from the Latin incidere (to cut into), describing the physical act of cutting through ground or stone to create the feature. Incile appears in Roman law primarily in the context of regulations governing water use, watercourse maintenance, and the rights and duties of landowners with respect to adjacent streams and drainage works.
Common Confusion
Incile should not be confused with the broader Roman law category of aquaeductus (aqueduct or water conduit right) or with ripa (riverbank). Incile is the physical structure — the cut or trench — while aquaeductus refers to the legal servitude or right to convey water. A landowner might hold an aquaeductus right that required construction and maintenance of an incile, but the terms describe different things: one is infrastructure, the other is entitlement.
Why It Matters in Research
Incile is a narrow Roman civil law term with no direct English common law counterpart. Researchers encountering it in historical legal materials are almost certainly working with texts that draw on the Corpus Juris Civilis — either Roman law sources directly, or civilian-influenced legal traditions (canon law, continental European law, Scots law, or early American treatises that imported Roman water law concepts).
The primary locus for incile in Roman law is Digest 43.21, which deals with the interdict ne quid in flumine publico ripave eius facias — the prohibition against unauthorized works in or alongside public watercourses. Researchers working on water rights, riparian law, irrigation disputes, or drainage law in jurisdictions influenced by civil law (Louisiana, Quebec, South Africa, Scotland, and pre-codification continental Europe) may find this term in foundational texts or annotations.
Do not expect incile to surface in standard English common law case law or statutes. Its appearance in an English-language legal text is a signal that the author is drawing on Roman sources or writing for a civilian or mixed-jurisdiction audience. The term is essentially a term of art from Roman hydraulic law, and its presence can help date or categorize a source.
The extension of the term to include fossae and putei (ditches and wells) is worth noting for researchers: ancient Roman legal writers and their early modern commentators treated the category broadly, and disputes about what qualified as an incile — and therefore fell within the regulatory scope of Digest 43.21 — were not merely academic.
Historical Dictionary Support
Black's Law Dictionary and Burrill's Law Dictionary offer identical definitions, both tracing directly to Digest 43.21.1.5. This alignment is unsurprising: both entries are compressed civilian glosses rather than common law definitions, and neither source had significant independent Roman law scholarship to draw on for elaboration. Both correctly note that the term's scope extended to ditches and wells, citing the same Digest passage.
Neither source contextualizes incile within the broader scheme of Roman water law interdicts or distinguishes it from related structures. For deeper treatment, researchers should go directly to the Digest text and to civilian commentators. Justinian's Digest 43.21 and the surrounding titles on river and water law (Dig. 43.12–43.22) provide the operative legal framework within which incile functions as a defined term.
Jurisdictional Note
Incile has no operative meaning in modern American common law jurisdictions. It retains relevance in civil law and mixed jurisdictions where Roman water law concepts persist in codified or scholarly form, and in historical legal research across any jurisdiction where Roman or civilian sources were consulted in the development of water rights doctrine.