Bodies of water — Métropole 2017 — CD Carthage

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Dataset information

Catalog
Country of origin
Updated
2021.06.09 13:43
Created
Available languages
French
Keywords
FXX, données ouvertes, EAU DE SURFACE, METROPOLE, FRANCE, BD Carthage
Quality scoring
175

Dataset description

The main concept of hydrographic cutting is the hydrographic entity defined by Circular No. 91-50. The hydrographic entity is a natural or managed watercourse, a natural or managed arm, an artificial waterway (channel,...), a body of water or a coastal line. Hydrographic entities are broken down into two types: — linear hydrographic entities or streams, — surface hydrographic entities corresponding to water bodies and linear entities whose wide areas (above 50 metres) are represented by surface elements. A surface hydrographic entity can be crossed by a watercourse, which will be named the main stream. Each entity is identified by a unique generic code at national level. This 8-position alphanumeric code consists of dashes and characters. For example, a watercourse that crosses several zones or subsectors will have a generic code in the format of the following generic codes “V12-4000” or “R5--0420” (see below for the construction rule). In addition, a hydrographic entity has a so-called principal name. Construction rule for the generic hydrographic entity code: Each hydrographic entity shall be assigned a unique 3-digit number (5, 6 and 7 characters) for the medium and the hydrographic area(s) to which it belongs: this is the number of the hydrographic entity. A hydrographic entity belonging to several zones shall retain its entity number in all the areas concerned. Two hydrographic entities of the same medium belonging to two different sub-mills will have separate entity numbers. The first four characters of the generic code correspond to all invariant codes of the hydrographic zones, the rest of the characters being replaced by ‘-’ dashes. For example, the “Viveronne” watercourse has the entity number: 050 and for middle code: 0. This watercourse is located within a single hydrographic area: P737. His generic code is therefore: P7370500 A surface hydrographic entity is a hydrographic entity consisting of water bodies and linear entities whose broad areas (above 50 metres) are represented by surface elements. In some cases, a surface hydrographic entity may be crossed by one or more streams — water bodies. However, it is held that only one hydrographic entity, known as the main watercourse of the water body. On the other hand, a hydrographic entity may be crossed/contained by a set of elementary sections.
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