Obernau (victory)

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Obernau
The Obernau above the Obernautalsperre

The Obernau above the Obernautalsperre

Data
Water code DE : 272134
location at Netphen ; District of Siegen-Wittgenstein , North Rhine-Westphalia ( Germany )
River system Rhine
Drain over Victory  → Rhine  → North Sea
source in the Siegerland Rothaar-Vorhöhen near the Alter Burg
50 ° 56 ′ 12 ″  N , 8 ° 10 ′ 7 ″  E
Source height approx.  520  m above sea level NHN
muzzle in Obernetphen in the Sieg coordinates: 50 ° 54 ′ 34 "  N , 8 ° 6 ′ 27"  E 50 ° 54 ′ 34 "  N , 8 ° 6 ′ 27"  E
Mouth height approx.  285  m above sea level NHN
Height difference approx. 235 m
Bottom slope approx. 37 ‰
length 6.3 km
Catchment area 14.89 km²
Left tributaries Nauholzbach
(this and others see below )
Right tributaries (see below )
Reservoirs flowed through Obernautalsperre
Small towns Netphen
Residents in the catchment area approx. 2000

The Obernau is a 6.3 km long, northeast and orographically right tributary of the Sieg in the urban area of Netphen in the North Rhine-Westphalian district of Siegen-Wittgenstein . It is the namesake of the Obernautalsperre through which it flows.

course

Small Obernau waterfall above the reservoir basin of the Obernautalsperre (March 2015)

Current

The Obernau rises in the western foothills of the Rothaargebirge in the Sauerland-Rothaargebirge Nature Park . Your source lies southeast of not from this stream , but by the Netphe carrying Netphener district Afholderbach on the southern slope of the transition region of wide mountain ( 629.2  m above sea level.  NHN ) in the east and age castle ( 633  m ) to the west at about 520  m Height.

First of all, the Obernau flows roughly south. After a little more than 650 m of flow, it turns to the southwest. There two tributaries meet the Obernau : A relatively long left tributary, which rises northeast of the Sanktkopf ( 606  m ) and west of the Hohenroth forest house (approx.  637.5 m ), has a few short infiltration stretches  (similar to the stream shrinkage in karst areas ) and then partly in old well sockets, as well as a right tributary that rises on the southeast flank of the mountain Alte Burg.

After about 900 m, the Obernau to reach 394  m altitude, the northeastern total of two predust corners, which at 394  m is high and about 220 m is long, and m is other 600, and inflow of another left-hand and coming from Santa head inflow the Obernautalsperre to 369 , 7  m high. The creek flows out of the dam in a westerly direction and then for about 2.9 km through the Netphener district of Brauersdorf , making a small curve to the southwest and immediately afterwards again to the west, and through the Obernetphen district of Netphen .

In Obernetphen, the Obernau, which flows in its last meters from the northeast - 200 m after passing the market square - flows at about 285  m into the Rhine tributary Sieg, which comes from the southeast .

Before the dam construction

Obernautalsperre

Before the construction of the Obernautalsperre (1967–1972), the Obernau flowed through the Obernau valley with the town of the same name, Obernau , towards Brauersdorf. Obernau was demolished in the course of the dam construction and would now be under water at the end of the dam, in contrast to Nauholz , which would only be partially in the dam area. Originally, the Obernau in the Obernautälchen took up the Burbach (Leybach) on the right and an unnamed tributary on the left, which rises on the western slope of the Sanktkopf mountain. These tributaries, like the largest tributary of the Obernau, the Nauholzbach , flow into the dam today.

Catchment area and tributaries

The catchment area of Obernau is 14.89 km². Its tributaries include:

Surname page Length
( km ) 		Source Muzzle EZG
( km² ) 		GKZ
height ( m above sea  level )
nameless Left 0.88 5200 4050 272134-112
nameless Left 0.91 5640 3780
Burbach
(Leybach) 		right 1.26
+ 0.23 		4600 369.7 272134-194
nameless Left 1.14
+ 0.46 		5360 369.7 272134-196
Nauholzbach Left 3.95
+ 1.86 		5820 369.7 6.008 272134-2
Feldbach right 0.83 3870 3320 272134-294
nameless Left 0.82 3080
nameless Left 0.30 3620 3070
nameless right 0.78 3680 2920

Water quality

The water quality of Obernau is rated as low by the Ministry for Climate Protection, Environment, Agriculture, Nature and Consumer Protection of the State of North Rhine-Westphalia , that is, given the water quality level 1 to 2.

mountains

Mountains near Obernau are among other things - with heights in meters (m) above sea level and viewed roughly downstream:

  • Windhain (462.7 m; right)
  • Leyberg II (498.9 m; right)
  • nameless summit (504.4 m; right)
  • nameless summit (479.8 m; left)
  • Gösberg (461.1 m; left)
  • Höhhain (411.1 m; left)
  • Wittig (402.1 m; right)

References and comments

  1. ↑ a b German basic map 1: 5000
  2. ↑ a b c d e f g h Topographical Information Management, Cologne District Government, Department GEObasis NRW ( information )
  3. ↑ In the case of tributaries that flow directly into the Obernautalsperre, the original flow length is also given.
  4. ↑ For a better overview and sorting downstream, a hyphen is inserted for each river in the water body code (GKZ) after the number "272134", which stands for Obernau .
  5. ↑ North Rhine-Westphalia 3D. The interactive maps version 1.5, 2004, MagicMaps, ISBN 978-3-935603-31-7
  6. ↑ Map services of the Federal Agency for Nature Conservation ( information )