Schwarzbach (Ried)

Course

The Schwarzenbach does not have a source, but arises at the hunting lodge Mönchbruch, directly on the main road 486, from the confluence of Gundbach and Geräthsbach. The significantly longer Gundbach arises as Hengstbach south of Dietz Bach Witches in a swampy, close to the forest area. Its source is not in focus and difficult to reach. The black creek flows after its origin from Gundbach and Geräthsbach by the Treburer under forest and the forest pond before the stream bed passes through Nauheim. In Nauheim is a level measuring point of the Hessian State Office for Environment and Geology ( HLUG ). The level zero is located at 85.91 m above sea level. NN. About 2.5 kilometers west of Gross-Gerau leads coming from the Darmstadt- Arheilgen and flowing through wholesale Gerau Mühlbach in the Schwarzenbach. Southwest of Trebur the springing between Griesheim and Wolfskehlen Landgraben flows into the Black Brook. South of Trebur past the Schwarzbach flows then back to the west to the Rhine. In Astheim he then bends to the north, then south of Ginsheim in the Ginsheimer Altrhein - to lead - a tributary of the Rhine. The Old Rhine is reconnected after 1.5 km at the Rhine.

Southeast of Ginsheim is a flood barrage / pump system that is closed during floods of the Rhine and pumps to anstauende in Schwarzenbach water over the dam.

Data

The Schwarzenbach after the " waters Ethnography surface Directory State of Hesse " to the pumping station at Ginsheim an above-ground catchment area of 444.96 km ².

The flood level for the alarm stage 1 is 165 cm, 190 cm for stage 2 and stage 3 240 cm. The Schwarzbach river basin measure 2398th Along with the Landgraben and the Mühlbach is the Schwarzenbach a body of water the second order.

Water quality

The Schwarzenbach has a local standards high contamination with heavy metals.

He has of the Hessian waters the highest content of mercury (4 - to 8- fold value of the target ). The high levels of mercury come out of the country ditch, which is the major part of the urban area of ​​Darmstadt dehydrated and obviously heavily loaded by sediments of former industrial discharges.

In the content of the heavy metal cadmium, the Schwarzenbach is also Hessian leader. The cause lies in the tributaries Gundbach and Geräthsbach that are obviously burdened also by sediment flow deposits of industrial entries.

Even with the lead and copper pollution of Schwarzenbach is one of the most polluted rivers in Hesse. For chromium, arsenic, zinc and nickel values ​​, however, are in the range of the national average.