Darmbach

The intestine Bach in its headwaters, below the fishing ponds.

5 Forest ponds (fish ponds at the fisherman's hut ) and the Great Woog

Intestinal Bach is the addition name for the upper reaches of the country trench, a body of water in the Hessian Rhine valley. Below Darmstadt Landgraben changes its name side of intestinal Bach in Landwehr.

Data

The intestine is a stream waters III. Order. It is the responsibility of the Department of State Environmental Office of the Regional Council Darmstadt Darmstadt. The natural catchment area of ​​the intestinal stream / the Landwehr is 45.4 km2. In addition, a significant part of the rainwater from the Darmstadt city.

The water flow of the intestinal Bach above Darmstadt is currently about 25 liters per second, or an average of about 730,000 cubic meters per year. After reconnecting the dairy Bach, efficiency increases to approximately 970,000 cubic meters per year. In dry years, is currently the intestinal stream here dry out over a few weeks. Below Darmstadt, the water supply is much greater, because there the sewage treatment processes of the city and the Merck initiated.

Location and History

The intestine stream springs from the Darmstadt Ostwald. There the intestinal stream is fed by several sources. The combined intestinal stream source ( also called intestinal source) is about 300 m southwest of the 231 m high actuating head in the district of Upper Ramstadt, a few meters above the chief hunter pond, the river feeds the intestines. But these walled intestinal stream source is not different from the main source of the orifice farthest away. The intestinal stream is about 600 m away from the source dammed to five fish ponds. Due to the nature reserve Darmbachaue it flows to the light area, a location of the TU Darmstadt, passing from the east to the city of Darmstadt. There the intestinal Bach 1567 originally to the fire water pond and water amusement park Big Woog (now a natural lake ) accumulated. About 200 meters after the Great Woog the intestinal stream is introduced into the Darmstadt sewers and comes with the waste water to the municipal sewage treatment plant in the central northwestern part of the city between Gräfenhäuser road and Mainzer Straße. The purified end of the central wastewater treatment plant is currently the "rebirth" of the intestinal Bach dar. Behind the Mainzerstraße the intestinal stream then exits the Darmstadt city and flows straightened further to the west. From about 3.5 km west of Darmstadt and north-east of Griesheim nearby flood retention basins Triesch the water changes its name to Landwehr and flows north of Griesheim near Buettelborn in the country ditch. West of Buettelborn receives the Landgraben from left to Scheid ditch and from right to Worse trench ( also: Worse ditch ). Then it flows in Trebur in the Schwarzenbach, which in turn flows at Ginsheim into the Rhine.

Darmstadt is one of the few German cities that are not located on a river, and the intestinal Bach is the largest flowing waters of the city - next to the River Vltava, which flows through the southern part Eberstadt.

Water freight in the summer months

The intestine Bach already a few meters of its source flows through seven ponds. First, it flows through the chief hunter Pond ( owned by the Traisaer fishing club), then the pond on the southeastern edge of the fish ponds (without names) and a total of 5 fish ponds at the fisherman's hut, which the angler club Darmstadt belong eV and are also called ' forest ponds '. These forest ponds were created at the beginning of the 1960s.

In extreme heat and drought they play a crucial role in the water load of the intestinal stream. Although the ponds are indispensable and have a great importance as a habitat, scenic, recreational and club grounds, these are the actual main reason that the intestinal stream in summer in its further course towards Lichtwiese, Botanical Garden and Grand Woog very little leads water. The evaporation rate of the intestinal stream water in the ponds in summer is so high that the water level drops considerably and sometimes even falls in the individual ponds under the attack edge of the monks. Thus, no or significantly less water is discharged into the intestine Bach and parts of the stream bed are thus dry. The additional evaporations and natural seepage in the stream bed of the intestinal Bach's water scarcity is exacerbated during major and prolonged heat waves.

The other feeds the intestinal stream, such as the water of the fountain Albert, in dry summers usually not in a position to ensure complete wetting of the remaining intestine stream bed to the Great Woog. Also, by sealing the adjacent surfaces of the TU Darmstadt and the resulting cut correspond rainfall, which also formerly the intestinal stream supplied to a large extent with water, the local stream Darmstadt is withheld or withdrawn, additional water.

From these facts, it is extremely important to submit to the well during the summer months unceasing water of dairy Bach of the Three Fountains source on the upper field, the intestine Bach in the amount of the Botanical Gardens again to allow a controlled flow into the Great Woog and outflow from the Great Woog.

History

1585, the current flowing through the Darmstadt market Bach was covered. 1602, the first permanent building complex was completed in 1786 and the intestinal Bach was moved to the downtown Darmstadt completely underground. This was already 100 years before Darmstadt got a sewer. As in many other cities a natural watercourse was thus relegated to the sewer.

The origin of the name Bach intestine is unknown. For about 200 years, the waters that name. Contrary to popular belief the intestinal Bach is not the namesake of the city of Darmstadt.

The chief hunter pond was created in 1700 by order of the then chief forester and chief hunter and later Hessian Prime Minister and Privy Councillor in Darmstadt of Minnigerode. Originally there were three small ponds. 1823, the mean and the lower pond was drained and planted with trees. The Upper Jägermeister pond remained as chief hunter pond today. 1999, the pond was renovated extensively.

Exposure

In October 2001, a feasibility study was prepared which showed the technical and financial feasibility of a disclosure (restoration ) of the intestinal stream. Following the study, an open planning process began. In the downtown area differing from the former course of flow path was provided from various, mainly urban, reasons.

According to the original plan of the intestinal stream to be produced largely as open running creek from the Grand Woog about the Herrngarten up to an existing stream water channel at the Carl Schenck ring. Thus, the attractiveness of the city is to be increased and the central wastewater treatment plant are relieved. For overall planning also included the restoration of the dairy Bach, a currently also initiated in the city's sewer system tributary of the intestinal stream. For the disclosure of which the Local Agenda 21 began in Darmstadt. The flow path of the intestinal stream through the city is 3650 m, half of which are to be exposed. The future lines of Bach's intestine through the town was developed from a variety of alternatives in an open planning process.

The construction cost of the overall project is estimated by the City as of November 2013, 6.95 million euros, the additional operating costs 98,000 euros per year.

Invested in disclosing money can flow back through a reduction of waste water costs. Currently, the intestinal stream is mixed with its underground flow through the city sewage discharged into the sewage treatment plant, causing annual wastewater costs by an average of approximately 2.2 million euros, which will account for the recovery of the city. Since 1995 up to and including 2013 were paid 50,320,430.03 euros from the town of Darmstadt for the initiation of intestinal Bach and Bach dairy into drains .. The calculation of effluent charges is for the years 2014 to 2016 of each 2.19055 million EUR sewage costs.

However, since the fixed costs of the treatment plant is very high, the savings in wastewater are only about 210,000 euros. As a result, it is after the completion of disclosure (planned 2017) come to an increase in wastewater charges.

With the construction of the convention center darmstadtium first projects for the building of the new open flow path have been taken. A first, about 100 m long section was completed in late 2007. In this section can currently still not flow stream water, which is why one makes do with the artificial circulation of a small amount of rainwater. The bowel should be open stream flowing between Landgraf- Georg-Straße and Alexander Road at darmstadtium over and through the Herrngarten after his recovery.

Since the intestinal Bach performs a small amount of water in times of drought, the reconnection of the dairy stream is planned. This natural inflow to the intestinal stream was separated in the 1970s with the construction of a Straßenuntertunnelung for State Road 26 from the intestinal stream. The water of the brook flows since dairy farm in the combined sewer system and lacks the intestinal stream. The water management of the dairy stream is 4 to 10 liters per second over the year very evenly distributed and was therefore for the water management of the intestinal stream always an important factor. Our previous intensive agriculture in its catchment area, the dairy stream is, however, still loaded with nitrogen and phosphates. The now carried out restoration of the creek and the change of intensive agriculture to organic agriculture, as well as additional measures to be implemented is expected to substantially reduce the previous values ​​. The dairy Bach is the manifestation of the Three Fountains source on the upper field.

The planned exposure of the intestinal stream is a very intense and controversial issue in Darmstadt.

In one known on 12 March 2008 had become expert opinion of TUD - Professor Peter Cornel these stated that disclosure and separation of bowel Bach, would not get significant improvement in the function of the treatment plant, which would be taken alone justify the investment of the remainder of the project. The project was declared completed. An economic comparison of continuous operation to be paid by the city for the Bach Introduction wastewater fees with the remaining investment was not considered to be politically decisive.

On November 13, 2013 test results were submitted to the efficiency of the decoupling of the stream water from the sewer system. Thus, taking into account all cost aspects ( investment and operating costs, savings, fees, chargebacks, etc. ) with the stream water decoupling annual savings of 1.7 million euros respectively; Funds can use the city otherwise. Because of the proven effectiveness and because of the further advantages in urban design, identity / historical aspects and environmental aspects of the planning for the decoupling of intestinal Bach and Bach dairy was resumed. First, in addition to the developed before the planning stop implementation planning, alternative plans are developed, with higher proportions of cased sections or shorter route lengths have no objective, for example, to save further investment and operating costs. The intention is for the years 2014 and 2015 to create the plans and to obtain the necessary approvals or mid-2015 to begin construction and to be completed by year-end 2016. Impact on the fees required calculation arise then from the year 2017.

The intestinal Bach renaturation in the field Vivarium / Lichtwiese and the rehabilitation of the dairy stream were realized. Both measures are independent of the disclosure project in the city, for the summer water quality of the swimming lake Big Woog of high importance.