RiverBasinObject:  Sub-catchments
Sub-catchments, basin, or watershed describe hydrological catchment areas; They are described by their HEADER and in particular the hypertext description and imagery, map location and extent (basin boundaries).

Other attributes are grouped into topics and shown in pop-up windows that are triggered by BUTTONS. They include:

1. Attributes basic list of characteristics (Descriptors);
2. Economy employment and value generated by main sectors: agriculture, industry, services; optional: total and per capita GRP.
3. Geometry detailed area elevation curve with separate editor;
4. Land cover/land use Table of extended CORINE classes, parallel land use map;
5. GIS optional link to a detailed local mapset including DEM, landcover, and soils.
6. Links to other related objects such as monitoring stations, settlements, irrigation districts, farms, industries, treatment plants, aquifers, reaches, etc.

The Attributes list of Descriptors includes:

Basin data and geometry:
catchment_size	toal extend of the catchment (upstream of the outflow point) in km2
population	total number of inhabitants, density per km²
basin_length	approximate measure of the basins main extend (along the main channel);
min_elevation	minimum elevation describes the elevation (masl) of the outlet; please note that this should be consistent with the hypsographic curve specified below)
max_elevation	maximum elevation describes the maximum elevation of the watershed boundary (catchment boundary); please note that this should be consistent with the hyspographic curve specified below;
channel_length	specifies the total length of the main (mainstream and first-order tributaries) channel;
maximum channel_width	approximate maximum width of the channel, usually at the outflow from the basin
channel_width	approximate average (characteristic) width of the channel, e.g., corresponding to a point 2/3 from headwaters to outlet
drainage_length	total length of the perennial channels in the natural drainage system

Land use/Land cover
Provides a tabular summary and editing facility for land use in %, pie chart, and parallel land use map,
based on a modified CORINE level 1 or 2 classificiation, as applicable:

1.	Built up area (largely sealed)
1.1	Urban fabric
1.2	Industrial, commercial and transport units
1.3	Mine, dump and construction sites
2.	Agriculture
2.1	CROPLAND (Arable land)
2.2	IRRIGATED CROPS (Permanent crops)
2.21	Orchards, plantations
2.4	Heterogeneous agricultural areas incl. greenhouses
2.	Pastures, meadows
2.3	Pastures
1.4	Artificial non-agricultural vegetated areas
3.	Forest, woodlands
3.1	Forest
3.2	Shrubs and/or herbaceous vegetation associations
4.	Wetlands
4.1	Inland wetlands
4.2	Coastal wetlands
5.	Waterbodies
5.1	Inland waters
5.2	Marine waters
6.	Wasteland, uncultivated
1.3	Mine, dump and construction sites
3.3	Open spaces with little or no vegetation