Gauge Mainz — current water level and draft

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Gauge Mainz is on the Rhine at kilometre 498, on the km 462–508 stretch. The GlW is 171 cm and the fairway depth maintained below it (TuGlW) is 210 cm; after deducting 30 cm of safety margin the official rule of thumb comes out at Mainz +9. In practice Mainz +30 is used here, +21 cm against the official rule. At high water Marke I is at 475 cm and Marke II — above which the waterway closes — at 630 cm. This gauge has one forecast source: the 2-day forecast from the Hochwasserzentrale Rheinland-Pfalz (red). Upstream lies Worms, downstream Oestrich.