Evaluation of the high-energy flood of mid-July 2021 as a morphologic driver in the anthropogenically developed Ahr Valley, Germany, in interaction with infrastructures

Environmental Sciences Europe

Table 2 Overview of the map database and available river gauges in the focus areas

Date	Resolution	Discharge data (mean daily value)	Map source
Historic hand-sketched maps
1803–1820, Kartenaufnahme der Rheinlande durch Tranchot und von Müffling	1.28 m	No information	[71]
1843–1878, Preußische Kartenaufnahme, Uraufnahme	2.27 m	No information	[72]
Digital orthophotos
13.05.1998	0.4 m	River gauges Altenahr (2 m³/s) and Sinzig (2 m³/s)	[54]
13.05.2001	0.4 m	River gauges Altenahr (4 m³/s) and Sinzig (4 m³/s)	[54]
06.09.2004	0.4 m	River gauges Altenahr (2 m³/s) and Sinzig (3 m³/s)	[54]
28.04.2007	0.4 m	River gauges Altenahr (1 m³/s) and Sinzig (1 m³/s)	[54]
24.08.2009	0.4 m	River gauges Altenahr (1 m³/s) and Sinzig (1 m³/s)	[54]
25.05.2011	0.4 m	River gauges Altenahr (1 m³/s) and Sinzig (1 m³/s)	[54]
09.07.2013	0.4 m	River gauges Altenahr (2 m³/s) and Sinzig (4 m³/s)	[54]
07.06.2015	0.4 m	River gauges Altenahr (2 m³/s) and Sinzig (7 m³/s)	[54]
27.05.2017	0.4 m	River gauges Altenahr (1 m³/s) and Sinzig (1 m³/s)	[54]
27.06.2019	0.4 m	River gauges Altenahr (1 m³/s) and Sinzig (1 m³/s)	[54]
24.07.2021	0.1 m	River gauges Altenahr (8 m³/s) and Sinzig (10 m³/s)	[63]
03.09.2021	0.4 m	No information	[67]
14.06.2022	0.1 m	No information	[63]