Agger

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Agger
Muzzle of the Sülz (below) into the Agger

Muzzle of the Sülz (below) into the Agger

Data
Water code EN : 2728
location Germany
River system Rhine
Drain over Victory  → Rhine  → North Sea
source south of Meinerzhagen
51 ° 5 ′ 56 ″  N , 7 ° 39 ′ 5 ″  E
Source height 438  m above sea level NHN
muzzle near Troisdorf in the Sieg Coordinates: 50 ° 48 '2 "  N , 7 ° 10' 27"  E 50 ° 48 '2 "  N , 7 ° 10' 27"  E
Mouth height 51  m above sea level NHN
Height difference 387 m
Bottom slope 5.6 ‰
length 69.5 km
Catchment area 816.244 km²
Discharge at the Lohmar
A Eo gauge : 785 km²
Location: 5.62 km above the mouth 		NNQ (07/29/1957)
MNQ 1951/2007
MQ 1951/2007
Mq 1951/2007
 MHQ 1951/2007
HHQ (02/23/1970) 		834 l / s
2.31 m³ / s
17.1 m³ / s
21.8 l / (s km²)
 189 m³ / s
385 m³ / s
Reservoirs flowed through Aggertalsperre
Medium-sized cities Meinerzhagen , Gummersbach , Overath , Lohmar , Siegburg , Troisdorf
Small towns Bergneustadt
Communities Lindlar , Engelskirchen

The Agger is a 69.5 km long, north-eastern and right tributary of the Sieg in southern North Rhine-Westphalia . It flows in the Märkischer Kreis , Oberbergischer Kreis , Rheinisch-Bergischer Kreis and Rhein-Sieg-Kreis .

Origin of name

The name Agger is of Celtic origin from pre-Germanic times and means "flowing water". The root of the word is the same as, for example, in Latin “aqua”.

geography

course

The source of the Agger is located on the southern outskirts of Meinerzhagen at 437  m above sea level. NHN and one kilometer west of the Volme spring . From here it first flows south, taking in several small streams on the right and left sides. The Leienbach, coming from the east, flows out shortly after Grünenthal . A few kilometers further, the Agger reaches the Aggertalsperre, named after it . The Rengse , which comes from the east, and the Genkel , which also comes from the north, flow here, which are dammed up to the Genkeltalsperre just a few kilometers before they flow into the Aggertalsperre .

After leaving the Aggertalsperre, the Agger flows near Dümmlinghausen , here lined on the left by an embankment of the dismantled Gummersbacher Kleinbahnen , in a wide arc to the west around the Aehlenberg ( 380.9  m ), takes up the Hesselbach on the right and the Leienbach on the left and reaches a little later Shock . Here the Dörspe coming from the northeast from Bergneustadt and the Steinagger coming from the south meet . The Agger turns its course to the west, flows through Rebbelroth and takes in the Seßmarbach flowing in from the north near Niederseßmar . The Rospebach and Strombach and the Halstenbach, which comes from the southeast, also flow from the north at Vollmerhausen .

The Loper Bach coming from the north flows near Oesinghausen , which shortly before had taken up the longer Lambach . The Wiehl flowing in from the south flows between Osberghausen and Ründeroth . The Walbach flowing to the right has an underground mouth in Ründeroth and, a little downhill from the Agger, an above-ground mouth opposite the locality of Ohl. In the Engelskirchen area , the Kaltenbach flows first on the left , then the Leppe and Horpebach on the right . At Loope , the Agger takes on the Loopebach coming from the east and the Holzerne Siefen coming from the north .

Behind Loope, the Agger flows to the southwest. After the Ehreshoven reservoir , the Schlingenbach and the Lombach, coming from the southeast, flow . A little later, the Agger Overath flows around to take in the Bombach and Dahlhauser Bach coming from the northwest a few kilometers further . The further route leads the Agger past the Lohmar districts of Agger , Honsbach , Neuhonrath and Wahlscheid . In Honsbach, the Agger flows to the left of the Honsbach coming from the east. In Neuhonrath, the Maarbach, also coming from the east, flows to the left of the Agger. In Wahlscheid the Steffensbach first flows into the Aggerbogen from the right bank, then three more nameless streams follow, also from the right bank. After the wooden bridge at Schiffarther Straße, the Hohner Bach flows from the left bank of the Agger. Shortly afterwards the Oberscheider Bach flows from the right to the Agger. At the southern end of Wahlscheid, the Kirchbach , Mackenbach , Atzenbach and Stolzenbach finally flow into the Agger from the left bank . Before Donrath in Kreuznaaf , the Naafbach flowing in from the east is recorded. In Donrath the Ellhauser Bach and the Hasselsiefen flow into the Agger on the left. The Sülz from the north and the Jabach from the east flow between Donrath and Lohmar . At Lohmar , the Scheuerbach coming from the northwest and the Auelsbach flowing through Lohmar flow on the left. A little later the Agger flows into the Sieg between Troisdorf in the west and Siegburg in the east .

On its way from the source to the mouth, the Agger experiences a height difference of 386 m with an average bed gradient of 5.6 ‰.

Tributaries

The largest tributary of the Agger is the Sülz at river kilometers 7.1. With its 244.571 km² catchment area it has a share of 30% in that of the Agger. Another important tributary is the Wiehl , which is 33.6 km longer than the Agger with 27.7 km up to this point. However, at this point the Agger has the larger catchment area with 180.592 km² compared to the Wiehl with 140.721 km². In the following, the tributaries of the Agger are named that are longer than 5 km or have a catchment area of ​​more than 5 km². They are named in the order from the source to the mouth.

Surname Stat.
in km

location Length
in km 		EZG
in km² 		Mouth height
in m above sea level NHN 		GKZ
Rengse 61.463 Left 5.630 7.475 284 2728 12
Genkel 60.890 right 7.102 10.656 284 2728 14
Dörspe 56.035 Left 11.747 27.633 202 2728 18
Stone excavator 55.830 Left 11,424 30,343 201 2728 2
Seßmarbach 51,481 right 9,036 20,182 181 2728 32
Rospebach 48.779 right 8.194 13.279 169 2728 34
Strombach 48,548 right 8.313 6.390 169 2728 36
Loper Bach 43.766 right 3.068 10.017 153 2728 38
Wiehl 41.779 Left 33,594 140.721 145 2728 4
Walbach 38.284 right 5.057 6.581 132 2728 52
Kaltenbach 36.227 Left 5.356 5.756 126 2728 54
Leppe 33.811 right 19,392 52.227 119 2728 6
Loopebach 30,589 Left 7.697 12,528 111 2728 72
Schlingenbach 25.884 Left 6.613 8,731 099 2728 74
Naafbach 9.963 Left 22.652 45.869 067 2728 78
Sülz 7.102 right 48.711 244,571 062 2728 8
Yeah 6,901 Left 7.809 7.523 061 2728 92
Auelsbach 5.412 Left 7.417 7.720 059 2728 94
Rothenbach 2.806 Left 5.672 056 2728 994

Localities

Conservation and renaturation

The Aggerauen and a narrow strip along the bank from Vilkerath to almost the mouth form the FFH area Agger . Among other things, attempts are being made to reintroduce salmon in the Agger .

In Lohmar-Wahlscheid the Agger flows through the landscape garden of Aggerbogen . There, the city of Lohmar, the state of North Rhine-Westphalia and the Naturschutzbund Deutschland (Nabu) renaturalized the Aggerufer region. The Aggerbogen landscape garden is also the location of the Aggerbogen nature school , where nature and environmental protection are explained to children and adults.

Agger association

The Aggerverband (based in Gummersbach ) takes care of the maintenance of the rivers in the above-mentioned area, flood protection, purification of wastewater as well as drinking water treatment and supply.

Weather events

In January 2009 the Agger was completely covered with a 5 to 10 cm thick layer of ice in places with outdoor temperatures of −17 ° C and colder for several days, for example on the river sections of the Agger in Lohmar - Wahlscheid , such as the Aggerbogen. The bank zones were almost completely covered with a strip of ice at least one meter wide. Ice floes could be seen floating from the bridges over the Agger .

history

On January 2, 1584, the Battle of the Agger took place on the lower Agger during the Truchsessian War .

traffic

In addition to some roads, the Aggertalbahn railway line , which runs almost parallel in many places, is named after the Agger . Until the 1950s, the line of the Gummersbacher Kleinbahnen ran parallel in Dümmlinghausen , whose embankment can still be seen today between the roundabout towards Bernberg / Derschlag and the first bend in Aggertalstrasse.

Web links

Commons : Agger  - collection of images, videos and audio files

Individual evidence

  1. ↑ a b German basic map (DGK 5) in Topographical Information Management, Cologne District Government, Department GEObasis NRW ( information )
  2. ↑ a b c Topographical Information Management, Cologne District Government, Department GEObasis NRW ( information )
  3. ^ German hydrological yearbook Sieg / Lohmar 2007 ( Memento from June 4, 2015 in the Internet Archive ) (PDF; 24 kB)
  4. ↑ Manuela Giannetti: Nature school in the Aggerbogen. lohmar.de, accessed on August 22, 2015 .
  5. ↑ Lohmar. Live actively in the country. Aggerbogen Nature School. naturschule-aggerbogen.de, accessed on August 22, 2015 .