Dry-falling rivers

The water network of dry-falling rivers serves to record and maintain the list of waters in Lower Saxony in accordance with § 58(1) of the Lower Saxony Water Act (Niedersächsisches Wassergesetz, NWG) of 11 November 2020 (Nds. GVBl No 43/2020), which regularly carry water for less than six months a year. The water network is based on the Digital Terrain Model (basic DLM) of the State Office for Geoinformation and Surveying of Lower Saxony (LGLN) with the date of actuality indicated at the water sections. For the modelling of the water network, the data delivery products "GEW01" and "GEW03" were combined and attributively supplemented in order to have a linear water network also available for modelling purposes. Additional fields have been added in order to be able to add update notes.GEW01 - The spatial object type group with the designation "waters" and the identifier "44000" covers the areas covered with water. The attributes of the composite objects (ZUSO) of the object types AX_Watercourse (44002) or AX_Channel (44003) are attached directly to the associated spatial elementary objects (REO) of the object types AX_Water Axis (44004) or AX_Fliessgewaesser (44001).GEW03 - This output product contains the object type AX_Water Stationation Axis (57003). A water station axis is a line defined by a water authority in waters. It includes the following types:- Water axis of the Water and Shipping Administration (WSV) is a geometry that has been taken over unchanged from the documents of the WSV.- Approximated centreline in waters comply with the specifications of the directive of the territorial and water coding of the Länderarbeitsgemeinschaft Wasser (LAWA).- Fictitious connection in flowing waters connect a flowing water with the water axis of the receiving flowing water.- Fictitious connection in lakes and ponds is a hydrologically useful connection line in standing waters, which is needed for the construction of a closed topological water network.As additional criteria, data extracts on karst areas, soil moisture level and groundwater level of the Land Office for Mining, Energy and Geology (LBEG), the information from the grassland centre of Lower Saxony/Bremen e.V. on municipalities with high water density and information on whether a section of the WRL water network (Annex 2 of the OwV) is used. These data have been incorporated into the database attributively.