Water bodies — Guadeloupe 2009 — BD Carthage
Description
Water bodies refer to a surface, open, natural or anthropogenic surface freshwater area of varying depths. They may have thermal stratification characteristics.
The term “water body” covers a number of situations commonly referred to as lakes, traps, ponds, gravel, quarries or marshes. The definitions attached to these different situations are numerous and often refer to uses:
— A lake is a body of water located in a natural depression where the duration of the water and the depth are sufficient to define a pelagic zone and where, from spring to autumn, a stable thermal stratification takes place. (RMC Basin Network)
Naturally accumulated body of continental water — sufficiently deep, it usually involves stable thermal stratification (circular No. 91-50 1991).
— A retention is an artificial water body with a specific purpose: hydroelectricity, support for stretches, irrigation, drinking water supply. Generally, these bodies of water are characterised by irregular depth, variable level (marning) and a homogenous body of water. (RMC Basin Network)
Body of water artificially created by a dam (dam) located or not on a watercourse. May have thermal stratification and vegetation development characteristics similar to that of a lake or pond (circular No. 91-50 1991).
— A pond is a body of water of natural or artificial origin, of shallow depth without stable thermal stratification. It is fed mainly by its rain basin. (RMC Basin Network)
Body of continental water whose accumulation is sometimes natural but more often artificial. In most cases its primary vocation is or has been fish farming. The shallow depth does not permit thermal stratification and makes it possible to develop vegetation fixed over its entire extent (circular No. 91-50 1991).
— A gravel is a body of water of artificial origin created by the extraction of aggregates and fed mainly by the water table. (RMC Basin Network)
Body of water created by the extraction of aggregates in the alluvial plain of a watercourse and fed mainly by the alluvial water table (circular No. 91-50 1991).
— A quarry is an open-pit mining operation (Le petit Robert, 1992)
— A marsh is a set of wetlands where the surface stagnant water table is generally shallow. (IFEN 2000) (MATE 2001).
For the purposes of hydrographic coding, means a territory without significant relief irrigated or drained by a dense network of canals and/or arms and which may include bodies of water (circular No. 91-50 1991).
However, the implementation of the Framework Directive on Water requires a typology of environments based on natural criteria. It is therefore appropriate not to refer to uses in the definitions of types of water bodies even if types and uses are sometimes linked. Therefore, the typology developed for water bodies in the water body category is now referenced.
A water body is identified by its hydrographic code as defined in the hydrographic reference and its map declination BD Carthage. Any plan must therefore be first identified in the hydrographic reference. This code is constituted as follows: [First 4 characters the corresponding hydro zone if fully included in a zone or code of subsector + ‘-’ if more than one zone, or sector code +‘--’ or code of the region + ‘---’] + [order number on 3 characters] + [3, which corresponds to the medium water body] (source: Circular on Hydrographic Coding).
A body of water is always represented as one or more polygons captured in the Carthage BD.
A body of water is located on one or more municipalities. Several possible cases:
the body of water is located in one and only municipality,
the body of water is located on several municipalities
Generally, the main (surface) hydroecoregion type 2 to which the water body belongs will be specified.
A body of water may be associated with a body of water or none. Conversely, a body of water may consist of one (general case) or more than one body of water (special case).
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Tags
- eau-de-surface
- france
- données-ouvertes
- bd-carthage
- guadeloupe
- hvd