query: located_in_the_administrative_territorial_entity sperberhai dyke
supports: The Sperberhai Dyke ( German : Sperberhaier Damm ) is in fact an aqueduct which forms part of the Upper Harz Water Regale network of reservoirs , ditches , dams and tunnels in the Harz mountains of central Germany . It carries the water of the Dyke Ditch over the depression of the Sperberhai to the Clausthal plateau . The Sperberhai Dyke was built in 1732 - 34 in order to satisfy the rising demand for water power for the water wheels of the Clausthal mines . The water crossed the embankment in a channel along its crest . The channel is only visible today at its western end . Its hydraulic capacity at peak times was up to 1,000 litres per second . At , the Bruchberg in the Upper Harz is the second highest mountain in Lower Saxony and the third highest in the Harz mountains in North Germany. It lies between Altenau and Torfhaus in the middle of the Harz National Park. The Bruchberg is more like a plateau and has no real summit. This plateau is partly covered with trees, but on the sunny southern slopes the trees have largely died as a result of bark beetle infestation (see photograph below). Following this insect destruction, a new natural forest, rich in its variety of species, is now growing in the heart of the Harz National Park. The Upper Harz refers to the northwestern and higher part of the Harz mountain range in Germany. The exact boundaries of this geographical region may be defined differently depending on the context. In its traditional sense, the term Upper Harz covers the area of the seven historical mining towns ("Bergstädte") - Clausthal, Zellerfeld, Andreasberg, Altenau, Lautenthal, Wildemann and Grund - in the present-day German federal state of Lower Saxony. Orographically, it comprises the Harz catchment areas of the Söse, Innerste and Grane, Oker and Abzucht mountain streams, all part of the larger Weser watershed. 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 (particularly from the Bruchberg and parts of the Brocken massif). 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. The Brocken, also sometimes referred to as the Blocksberg, is the highest peak of the Harz mountain range and also the highest peak of Northern Germany; it is located near Schierke in the German state of Saxony-Anhalt between the rivers Weser and Elbe. Although its elevation of is below alpine dimensions, its microclimate resembles that of mountains of about . The peak above the tree line tends to have a snow cover from September to May, and mists and fogs shroud it up to 300 days of the year. The mean annual temperature is only . It is the easternmost mountain in northern Germany; travelling east in a straight line, the next prominent elevation would be in the Ural Mountains in Russia. Surface runoff (also known as overland flow) is the flow of water that occurs when excess stormwater, meltwater, or other sources flows over the Earth's surface. This might occur because soil is saturated to full capacity, because rain arrives more quickly than soil can absorb it, or because impervious areas (roofs and pavement) send their runoff to surrounding soil that cannot absorb all of it. Surface runoff is a major component of the water cycle. It is the primary agent in soil erosion by water.
candidates: alpine central east germany grane harz lower saxony mountain national park north of russia
answer: lower saxony