gauge levels
In Germany the flood extent is described by four gauge levels ("Meldestufen") according to the "Hochwassermeldeverordnung HWMO" (flood report ordinance). The according water levels are announced for each gauging station in system of flood centers.
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Level 1: Little overflowing.
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Level 2: Agricultural land and forest areas are flooded or minor traffic obstruction on main- and rural roads.
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Level 3: Several built-up areas are flooded or blocking of supra-local transport links or sporadic efforts of dyke associations or rescue units.
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Level 4: Built-up areas are flooded to a greater extent or efforts of dyke associations or rescue units are essential on a big scale.
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