Equivalent water level
The equivalent water level (GlW) is a statistically determined reference water level from which the Federal Waterways and Shipping Administration can determine the existing or desired water depths for a free flowing river serving as a federal waterway . For a river level, the GlW is defined as the level at which the nominal depth of the fairway is still guaranteed. Based on the target depth and the difference between GlW and the current water level, shipping calculates the unloading depth and thus the possible payload for a trip. The GlW shows the water level that occurs with an equally low discharge at the individual river levels. This equivalent discharge (GlQ) results from the duration of the shortfall in flow of 20 ice-free days for a defined annual series.
Since the flow conditions and the river bed are variable, the GlW value must be checked at regular intervals and adjusted if necessary. It is important for the hydraulic engineering administration with regard to the definition and establishment of the maintenance or expansion objective. The GlW 2010 is up-to-date for the Elbe and the GlW 2012 for shipping on the Rhine . On the Weser , the latest GlW dates from 2004.
Individual evidence
- ↑ BMVI and BMUB, January 17, 2017: Elbe overall concept. Strategic concept for the development of the German Inner Elbe and its Auen GlW definition in the glossary on page 37 of the PDF file 3.43 MB
- ↑ Federal Institute for Hydrology , November 10, 2015: Can you soon cross the Rhine in Kaub on foot? GLW definition on page 3 of the PDF file 1.21 MB
- ^ Transport information service of the German transport insurers : waterway infrastructure with GLW definition for free flowing rivers
- ↑ ELWIS: Water levels & forecasts at water levels relevant to shipping on the Weser