Leda (river)
| Leda | ||
 The Leda flows into the Ems, the Leerort |
||
| Data | ||
| Water code | EN : 38 | |
| location | Germany , Lower Saxony | |
| River system | Ems | |
| Drain over | Ems → North Sea | |
| source | northwest of Spahnharrenstätte 52 ° 52 ′ 35 ″ N , 7 ° 34 ′ 11 ″ E |
|
| Source height | 31 m above sea level NHN as "Ohe" | |
| muzzle | at Leerort near Leer in the Ems Coordinates: 53 ° 12 '37 " N , 7 ° 25' 27" E 53 ° 12 '37 " N , 7 ° 25' 27" E |
|
| Mouth height | 0.2 m above sea level NHN | |
| Height difference | 30.76 m | |
| Bottom slope | 0.43 ‰ | |
| length | 72.2 km | |
| Catchment area | 2,096.05 km² | |
| Left tributaries | Hauptfehnkanal , polderkanal | |
| Right tributaries | Loruper Beeke, Rittveengraben, Marka , Bollinger Canal, Jümme | |
| Communities | Breddenberg , Sedelsberg , Ramsloh , Strücklingen , Potshausen | |
| Navigable | 25 km | |
The Leda (rarely used WSV abbreviation: Ld) is a right tributary of the Ems in Lower Saxony ( Germany ) and a federal waterway .
Of the 25 km of the course of the river above the estuary, the lower 1.9 km are maritime waterways , the upper 23 km inland waterways . The inland shipping route also includes 0.56 km of Sagter Ems from the meeting with the Dreyschloot to the confluence of the Elisabethfehn Canal . The sea shipping route belongs to the waterway class Vb, the inland waterway to class II up to the Jümm estuary (km 15.95), the rest is not classified. The Emden Waterways and Shipping Office is responsible .
course
The Leda rises as Ohe northwest of the Emsland Spahnharrenstätte .
After 24 km the Ohe joins just south of the coastal canal and 9 km west of Friesoythe with the Marka zur Sagter Ems , the historical lifeline of the Saterland known for its East Frisian language . The influence of the tides begins between Ramsloh and Strücklingen .
On the northern edge of the Saterland, the river (47.6 km after its source) takes on the Elisabethfehn Canal, which comes from the moorland bordering to the east . The name Leda begins half a kilometer away . There is a cross connection to the Jümme , the Dreyschloot . It represents something like a tributary of the Jümme, through which at high tide, offset to the wave of the Jümme, water flows upstream into the Barßeler Tief and at low tide water flows from the Barßeler Tief into the Leda.
The actual confluence of the Leda with the significantly more water-rich Jümme is 15.2 km down the Leda. A good five kilometers later, the Leda barrage, built between 1949 and 1954 , protects Leda, Jümme and their tributaries from storm surges. More than three and a half kilometers further, a good 72 km from the source in the Hümmling , the Leda flows into the Ems at Unterems-km 14.23.
At the mouth it makes a sharp right turn. As a result, the headland, the Leerort , is unusually between the right banks of the inflow and main stream, instead of between the right bank of one and the left bank of the other, as is the case at other mouths. A fortress was built on this headland in the 15th century, the remains of which in the foreland are now little more than a ground monument . The Leerort fortress used to be located directly to the north of the mouth of the Leda, of which today only meager remains can be seen in the foreland of the dike. The Overledingerland (Overledingen = "land beyond the Leda") extends south of the estuary . There is the village of Kloster Muhde (“Muhde” from Old Frisian “mutha” = mouth).
various
There is a connection to the port of Leer via a sea lock measuring 192 m × 26 m. The harbor used to be a bend in the river that was cut off by a puncture. The Leda and its tributary Jümme drain a lowland area of around 35,000 hectares in East Frisia . About 15 km above the mouth of the Jümme, the Leda (or Sagter Ems) is connected to the Jümme (or the Barßeler Tief ) via the Dreyschloot, which already existed at the beginning of the 19th century at the latest, but became a canal for 1848 to 1852 the then technically modern peat ships were expanded.
Leda barrage and pumping station
The Leda has a storm surge barrier through which the normal tidal currents can still penetrate far upstream, and which is only closed in the event of threatening floods. The Leda barrage was built between 1950 and 1954 to protect against storm surges and was put into operation in July 1954. It has five openings, each 14 m wide, which can be closed with 10.5 m high lift gates. The middle opening serves as a ship passage. In December of the same year, the barrage already proved itself in a high storm surge.
Between 2000 and 2001, the Leda pumping station was built right next to the Leda barrage to improve flood and storm surge safety in the Leda-Jümme area. The Leda barrage, which is closed in the event of storm surges, prevents the water from penetrating the Leda-Jümme area from the lake side, but at the same time it blocks the outflow from the inland. With the help of the new pumping station, it is possible to pump up to 3.5 million cubic meters of Leda water into the Ems every day and to prevent the Leda-Jümme area from being flooded by dammed inland water, even when the barrage is closed for a long time.
The pumping station is intended to fulfill a further function in connection with ship transfers from the Meyer Werft in Papenburg to the mouth of the Ems: when the Ems barrage at Gandersum is closed, up to 5.7 million cubic meters of dammed tidal water from the Leda-Jümme area can also be pumped into the Ems in order to reach the required congestion destination in the Ems from 1.75 meters to 2.5 meters above sea level as quickly as possible. The aim is to minimize interference with natural processes.
See also
Web links
Individual evidence
- ↑ Nds. Environmental maps with GK 5 and water network
- ↑ Mean tidal mean water 2012–2016, information from LWKN Aurich
- ↑ Drawn GPS track Ohe - Sagter Ems - Leda
- ^ Environment Lower Saxony: Area directory Ems , including NRW rivers
- ↑ Directory E, serial no. 27 der Chronik ( Memento of the original from July 22, 2016 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. , Federal Waterways and Shipping Administration
- ↑ a b c Lengths (in km) of the main shipping routes (main routes and certain secondary routes) of the federal inland waterways ( memento of the original from January 21, 2016 in the Internet Archive ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. , Federal Waterways and Shipping Administration
- ^ Carl Ludwig von Le Cocq: Topographical map in XXII sheets containing the largest part of Westphalia , Section IV: Map of the largest part of the Duchy of Oldenburg, part of the Principality of East Friesland and the Duchy of Bremen , 1805
