Ahr
Channel: all the knowledge of the universe PRINCIPIA
Date: 2022-01-11

Ahr, by Wikipedia https://en.wikipedia.org/wiki?curid=1005803 / CC BY SA 3.0

#Tributaries_of_the_Rhine
#Ahr
#Rivers_of_North_Rhine-Westphalia
#Rivers_of_Rhineland-Palatinate
#Rivers_of_the_Eifel
#Rivers_of_Germany
Ahr （German pronunciation: [ˈaːɐ̯]） is a river in Germany, a left tributary of the Rhine.
Its source is at an elevation of approximately 470 metres （1,540 ft） above sea level in Blankenheim in the Eifel, in the cellar of a timber-frame house near the castle of Blankenheim.
After 18 kilometres （11 mi） it crosses from North Rhine-Westphalia into Rhineland-Palatinate.
The Ahr flows through Ahr valley or Ahrtal, passing through the towns of Schuld, Altenahr and Bad Neuenahr-Ahrweiler.
Between Remagen and Sinzig （south of Bonn）, at about 50 metres （160 ft） above sea level, it flows into the Rhine.
The length is roughly 89 kilometres （55 mi）, of which 68 kilometres （42 mi） is within Rhineland-Palatinate.
The Ahr has a gradient of 0.
4 percent in its lower course, and 0.
4 to 0.
8 percent in its upper course.
Source of Ahr in Blankenheim The Ahr and its tributaries are a main drainage system of the eastern Eifel.
The watershed is approximately 900 square kilometres （350 sq mi）.
There were isolated settlements in the Ahr valley beginning at the latest in Roman times, evidenced by the Roman villa near Ahrweiler.
Owing to their isolated location, the upper and middle parts of the course were sparsely populated.
That began changing in the mid-19th century.
The development of settlements and transportation routes （including three railway lines） and the expansion of the area used for agriculture in the Ahr valley led to the narrowing and constraint of the riverbed.
The course of the river was graded and its banks were stabilized.
Catastrophic flash flooding occurred on the Ahr in 1910 and 2021 resulting in the deaths of hundreds.
The Ahr rises in the middle of the village of Blankenheim, in the Eifel region of the German state of North Rhine-Westphalia, in the basemen...