Ilm (Lahn)

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Ilm
The source of the Ilm on the Grauhain in the Rothaar Mountains (summer 2013)

The source of the Ilm on the Grauhain in the Rothaar Mountains (summer 2013)

Data
Water code DE : 2581112
location Rothaar Mountains

Germany

River system Rhine
Drain over Lahn  → Rhine  → North Sea
Ilm spring in the Rothaargebirge between the Grauhain and the Jägerhain
50 ° 54 ′ 32 ″  N , 8 ° 14 ′ 39 ″  E
Source height approx.  623  m above sea level NHN
muzzle at Volkholz -Welschengeheu
in the Lahn coordinates: 50 ° 54 ′ 15 ″  N , 8 ° 16 ′ 9 ″  E 50 ° 54 ′ 15 ″  N , 8 ° 16 ′ 9 ″  E
Mouth height approx.  485  m above sea level NHN
Height difference approx. 138 m
Bottom slope approx. 68 ‰
length approx. 2 km
Catchment area 1,871 km²
Left tributaries two nameless streams
Right tributaries a nameless brook
Small towns Bad Laasphe

The Ilm is an approximately 2 km long, west-north-westerly and orographically left tributary of the Lahn in the North Rhine-Westphalian district of Siegen-Wittgenstein .

geography

course

The Ilm rises and runs in the south of the Rothaargebirge and Westphalia in the southeast of the Sauerland-Rothaargebirge nature park . Its source lies on the border of Siegerland and Wittgensteiner Land and on that of the Nenkersdorf and Walpersdorf districts (districts of Netphen ) between the Nenkersdorf hamlet of Lahnhof in the south and the Bad Laaspher district of Großenbach in the north-northeast. It is located about 830 m south-southwest of the mountain peak of the Jägerhain ( 650.7  m ) and 490 m north of that of the Grauhain (approx.  638  m ) at around 623  m above sea level. NHN ; Directly next to the source, a point with a height of 622.7 m is recorded in the German basic map on the Eisenstrasse in the Rothaar Mountains  . The source of the ilm could be a stratification source or an interference source.

North to east of Grauhain and south to southeast of Jägerhain, the Ilm flows through a narrow and uninhabited forest valley - east-south-east through the Wittgensteiner Land. In the lower valley area there are two ponds by the stream .

Finally reaches the Ilm near Welschengeheu , a Weiler of Bad Laasphe belonging Volkholz , in the upper Lahntalhotel in which they southwest of the Weiler on the eastern edge of the district Nenkersdorf to about 485  m height in the zoom flowing there from southwest Rhein creek Lahn opens ; its mouth is at the Lahn kilometer 190.87.

Natural allocation

The Ilm rises in the natural spatial main unit group Süderbergland (No. 33) on the border of the main unit Siegerland (331) with the subunit Siegerländer Rothaar-Vorhöhen (331.2) in the west to the main unit Rothaargebirge (with Hochsauerland ) (333) with the subunit Dill-Lahn -Eder headwaters (333.0) in the east. It flows through the Ederkopf-Lahnkopf-Ridge (333.01) natural area, which is part of the Dill-Lahn-Eder source area .

Catchment area and tributaries

The catchment area of the Ilm is 1,871 km². Because of its location near the Grauhaing summit, its source has a small catchment area. Therefore, the stream usually has little water and sometimes dries up completely. The Ilm tributaries include three small rivers; two of them open on the left from the north, the other on the right from the southwest.

Protected areas

South above the Ilmoberlauf lies the nature reserve Auerhahnwald ( CDDA -Nr. 81326; designated 1934; 14.46 km²). The entire stream is located in the landscape protection area of ​​the municipality of Netphen (CDDA no. 555558489; 1985; 117.4529  km² ) and in the fauna-flora-habitat area Rothaarkamm and Wiesentäler (FFH no. 5015-301; 34.46 km²).

Traffic and walking

The Eisenstrasse of the Rothaargebirge leads directly to the east past the source of the Ilm as part of the state road  722 at an altitude of 622.7  m . The Rothaarsteig runs parallel to the street . South of the Ilm, near its confluence with the Lahn, at the end of Kreisstraße  34 (Glashütter Straße), there is a refuge .

References and comments

  1. ↑ a b c d e f Topographical Information Management, Cologne District Government, Department GEObasis NRW ( information )
  2. ↑ a b c d e Water directory of the State Office for Nature, Environment and Consumer Protection NRW 2010 (XLS; 4.67 MB) ( Notes )
  3. ↑ Flyer: GeoWanderführer Rothaarsteig ( Memento from September 24, 2015 in the Internet Archive ), Geological Service NRW, 216 pages, Krefeld, 2008, ISBN 978-3-86029-973-9 (PDF; 2.51 MB), accessed on 12 May 2019
  4. ↑ Map services of the Federal Agency for Nature Conservation ( information )