page_title: Dyke Ditch
section_title: Catchment area
hierarchical_section_title: Dyke Ditch / Catchment area
caption_attribution_description: Dammgraben - Zulauf
context_page_description: The Dyke Ditch is the longest artificial ditch in the Upper Harz in central Germany. Its purpose was to collect surface runoff for the operation of the Upper Harz mining industry from precipitation-heavy regions a long way away. It was laid in 1732 and continually extended eastwards until 1827. Its original length was about 25 km; this was successively shortened by water tunnels between 1820 and 1861 to around 19 km. It is a central component of the Upper Harz Water Regale. Its takes its name from the Sperberhai Dyke which is, in fact, an embankment on top of which the Dyke Ditch runs in an aqueduct in order to cross a depression.
context_section_description: The Dyke Ditch draws its water from the region of six Harz rivers:
  Söse over the Morgenbrodstal Ditch (1715–1718; length 3,970 m)
  Sieber over the Clausthal Flood Ditch (also called the Rotenbeeke Ditch) (1797; length 3,900 m)
  Oder over the Clausthal Flood Ditch and the Flörichshai Ditch (1826; length 1,050 m)
  Ecker over the Abbe Ditch (1827; length 1,540 m)
  Radau over the Abbe Ditch
  Oker over the Dam Ditch (1725–1840; length 14,690 m)
  The Dyke Ditch system crosses several watersheds as a result.
caption: Outlet of the Großer Gerlachbach into the Dyke Ditch between Altenau and the dam house
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