{{Short description|Lakes in Upper Harz, Germany}}[[File:Teiche Buntenbock.jpg|thumb|Ponds near Buntenbock south of Clausthal-Zellerfeld: the Ziegenberg Pond (front) and Marsh Pond (''Sumpfteich'', rear). Their dams are clearly visible.]] The '''Upper Harz Ponds''' ({{langx|de|Oberharzer Teiche}}) are found mainly around the mining town of [[Clausthal-Zellerfeld]] and the nearby villages of [[Buntenbock]] and [[Hahnenklee]] in the [[Upper Harz]] mountains of [[central Germany (geography)|central Germany]]. There are around 70 [[ponds]] in total, both large and small. They were built by the [[miners]] of the Upper Harz, mostly between the 16th and 18th centuries, and are important components of the [[natural monument|cultural monument]] known as the [[Upper Harz Water Regale]] - a network of dams, ditches, ponds and tunnels that was built to supply much-needed water power for the [[mining industry in the Harz mountains]]. Today the Water Regale is being proposed as a [[UNESCO]] [[World Heritage Site]]. About half the dammed ponds are classified today as [[reservoirs]], but they have now become characteristic features of the Upper Harz and are home to some extremely rare plant and animal species.
The Upper Harz Ponds also have the oldest working dams in Germany.
== Purpose == [[File:Kranicher Teich.JPG|thumb|The dam of the Great Crane Pond (''Großer Kranicher Teich'') near [[Hahnenklee]]. The bottom outlet can be operated from the control hut.]] The ponds were originally built for storing the water needed to drive the [[water wheel]]s providing energy to the Upper Harz [[silver mines]]. These water wheels drove the [[pump]]s, the hoisting equipment, the [[stamp mills]] and, from 1820, the [[man engine]]s as well.
To begin with, the ponds merely impounded water from their natural [[Drainage basin|catchment area]]s. But in many cases, their inflow was later increased significantly through the use of additional collection ditches.
Today the ponds are operated for several reasons: the protection of [[historic monument]]s, [[rural conservation]], [[nature conservation]] and [[recreation]]. Several ponds also provide [[flood protection]]; others are used to supply [[drinking water]].
The operator of the ponds today is the ''[[Harzwasserwerke]]'', who also manage six modern [[dams]] in the [[Lower Saxony|Lower Saxon]] part of the Harz.
== Design == The barriers were built as [[earth-fill dam]]s, the [[fill dirt|fill]] being usually excavated on site. Usually small [[quarries]] were established in the terrain earmarked as the future reservoir; this had the added advantage that it increased its eventual capacity. Neither [[clay]] nor [[silt]] could be used as [[grouting]] material because they did not occur in sufficient quantities in the Upper Harz. The Upper Harz miners had, however, learned from experience that grass [[sods]] or turves made excellent grouting; by placing them one on top of another, in a similar fashion to building a wall, a layer of sods up to a metre thick would be built into the dam which ensured that it remained watertight.
A wooden conduit (''Holzgerenne'') acted as a bottom outlet. It was usually made of [[oak]] due to its great durability. The valve was a so-called ''Striegel'', which acted like a plug and closed off the inlet to the wooden channels and was operated by rods. Both grass sod grouting and wooden bottom outlets are still in use in many of the ponds.
The dams themselves are between 4 and 15 m high and the impounded volumes varied between 10,000 and 600,000 m<sup>3</sup>. One notable exception is the [[Oderteich]] northeast of [[Sankt Andreasberg]], which is the only pond not grouted with grass turves, but with [[granite]] sand known as ''granitgrus'' and with a dam height of 21 m and reservoir volume of 1.7 million m³ of water stands head and shoulders above the other ponds in terms of size.
== Flora and fauna == [[File:Astacus astacus Hessentag 2008 close up.JPG|thumb|[[Astacus astacus|Crayfish]]]] [[File:CorrigiolaLitoralis1.jpg|thumb|[[Wort plants|Strapwort]] in the autumn]] Although these water features have been artificially created, rare [[flora]] and [[fauna]] have evolved in and around many of the Upper Harz ponds. The water is low in [[nutrients]] and rather cool. The [[European crayfish|crayfish]], which has died out in most European waterbodies due to [[crayfish plague]], has been able to survive in many Upper Harz Ponds thanks to their isolated locations. Pond operators and fishing leaseholders have worked successfully to increase their numbers.
The operation of the ponds over many centuries with constantly changing levels of water has also created a [[habitat]] for some extremely rare plant communities. On the soils of many ponds [[coral necklace]] (''Ilecebrum verticillatum''), [[Wort plants|strapwort]] (''Corrigiola litoralis'') or [[Littorella|shoreweed]] (''Littorella uniflora'') may be found growing. They are dependent on this constant fluctuation of water levels in the reservoir and so the nature conservation authorities have agreed with the pond operators an operating regime that will secure the existence of these plants in the waterbodies concerned. By other ponds there are meadow [[bogs]] (''Kleinseggenried''), which are rich in [[sedges]], [[Juncaceae|rushes]] and [[cottongrass]] and [[moss]] communities.
The [[fish]] population is primarily influenced by the [[angling]] clubs that lease fishing rights and stock the ponds with fish. Only native species of fish are desired, although [[eel]] and [[catfish]] are excluded due to their incompatibility with the crayfish populations.
== Table of Upper Harz Ponds == [[File:Huettenteich Altenau.JPG|thumb|The Smelter Pond (''Hüttenteich'') near Altenau]] [[File:Mittlerer Kellerhalsteich.JPG|thumb|The dam of the Middle Kellerhals Pond north of Zellerfeld is around 15 m high and can impound up to 436,000 m<sup>3</sup> of water.]] The following list includes the majority of the dammed ponds built by the Upper Harz miners, where they are still in operation or where the dam ruins are still clearly visible. [[Mill pond]]s are not included. A total of 143 dams and former dams have been documented.
{| class="wikitable sortable" |- class="hintergrundfarbe5" ! English name ! German Name ! Built ! Capacity in m³ ! Height above base in m |- | Old Sandpiper Pond | ''Alter Wasserläufer Teich'' | style="text-align:right;"| {{sort|1565|}}before 1565 | style="text-align:right;"|32,000 | style="text-align:right;"|5.30 |- | Capercaillie Pond | ''Auerhahnteich'' | style="text-align:right;"|1684 | style="text-align:right;"|61,000 | style="text-align:right;"|7.74 |- | [[Bärenbruch Pond]] | ''Bärenbrucher Teich'' | style="text-align:right;"| {{sort|1634|}}before 1634 | style="text-align:right;"|186,000 | style="text-align:right;"|7.09 |- | Carl Pond | ''Carler Teich'' | style="text-align:right;"|1673 | style="text-align:right;"|14,000 | style="text-align:right;"|5.10 |- | Upper Einersberg Pond | ''Einersberger Teich, Oberer'' | style="text-align:right;"| {{sort|1672|}}before 1672 | style="text-align:right;"|140,000 | style="text-align:right;"|9.16 |- | Middle Einersberg Pond | ''Einersberger Teich, Mittlerer'' | style="text-align:right;"| {{sort|1672|}}before 1672 | style="text-align:right;"|16,000 | style="text-align:right;"|7.74 |- | Lower Einersberg Pond (†) | ''Einersberger Teich, Unterer'' (†) | style="text-align:right;"| | style="text-align:right;"| | style="text-align:right;"| |- | Duck Marsh | ''Entensumpf'' | style="text-align:right;"| | style="text-align:right;"| | style="text-align:right;"| |- | Highest Eschenbach Pond (†) | ''Eschenbacher Teich, Oberster'' (†) | style="text-align:right;"| | style="text-align:right;"| | style="text-align:right;"| |- | Upper Eschenbach Pond | ''Eschenbacher Teich, Oberer'' | style="text-align:right;"|1548 | style="text-align:right;"|62,000 | style="text-align:right;"|10.50 |- | Lower Eschenbach Pond | ''Eschenbacher Teich, Unterer'' | style="text-align:right;"|1548 | style="text-align:right;"|167,000 | style="text-align:right;"|8.85 |- | Eulenspiegel Pond | ''Eulenspiegler Teich'' | style="text-align:right;"| {{sort|1546|}}around 1546 | style="text-align:right;"|61,000 | style="text-align:right;"|3.43 |- | Upper Flambach Pond | ''Flambacher Teich, Oberer'' | style="text-align:right;"|1701 | style="text-align:right;"|88,000 | style="text-align:right;"|6.50 |- | Lower Flambach Pond | ''Flambacher Teich, Unterer'' | style="text-align:right;"|1693 | style="text-align:right;"|48,000 | style="text-align:right;"|5.03 |- | Upper Raft Pond | ''Flößteich, Oberer'' | style="text-align:right;"| {{sort|1680|}}before 1680 | style="text-align:right;"|11,000 | style="text-align:right;"|5.00 |- | Lower Raft Pond | ''Flößteich, Unterer'' | style="text-align:right;"| {{sort|1680|}}before 1680 | style="text-align:right;"|10,000 | style="text-align:right;"|4.28 |- | Flöß Pond (Piß Valley) (†) | ''Flößteich, (Pißtal)'' | style="text-align:right;"| | style="text-align:right;"| | style="text-align:right;"| |- | Fortune Pond | ''Fortuner Teich'' | style="text-align:right;"|1721 | style="text-align:right;"|296,000 | style="text-align:right;"|14.33 |- | New Grumbach Pond | ''Grumbacher Teich, Neuer'' | style="text-align:right;"| {{sort|1714|}} after 1714 | style="text-align:right;"|108,000 | style="text-align:right;"|8.67 |- | Upper Grumbach Pond | ''Grumbacher Teich, Oberer'' | style="text-align:right;"| {{sort|1680|}} before 1680 | style="text-align:right;"|180,000 | style="text-align:right;"|10.50 |- | Middle Grumbach Pond | ''Grumbacher Teich, Mittlerer'' | style="text-align:right;"| {{sort|1681|}} after 1680 | style="text-align:right;"|72,000 | style="text-align:right;"|9.20 |- | Lower Grumbach Pond | ''Grumbacher Teich, Unterer'' | style="text-align:right;"| {{sort|1680|}} before 1680 | style="text-align:right;"|82,000 | style="text-align:right;"|7.52 |- | Haderbach Pond | ''Haderbacher Teich'' | style="text-align:right;"| {{sort|1693|}}before 1693 | style="text-align:right;"|103,000 | style="text-align:right;"|9.43 |- | Upper Hahnebalz Pond | ''Hahnebalzer Teich, Oberer'' | style="text-align:right;"| {{sort|1695|}} before 1695 | style="text-align:right;"|66,000 | style="text-align:right;"|8.11 |- | Lower Hahnebalz Pond | ''Hahnebalzer Teich, Unterer'' | style="text-align:right;"| {{sort|1676|}} 1676/86 | style="text-align:right;"|52,000 | style="text-align:right;"|6.50 |- | Hasenbach Pond | ''Hasenbacher Teich'' | style="text-align:right;"|1660 | style="text-align:right;"|140,000 | style="text-align:right;"|9.12 |- | Hare Pond (†) | Hasenteich (†) | style="text-align:right;"| | style="text-align:right;"| | style="text-align:right;"| |- | Upper Hausherzberg Pond | ''Hausherzberger Teich, Oberer'' | style="text-align:right;"|1588 | style="text-align:right;"|180,000 | style="text-align:right;"|7.18 |- | Lower Hausherzberg Pond | ''Hausherzberger Teich, Oberer'' | style="text-align:right;"| {{sort|1613|}} before 1613 | style="text-align:right;"|198,000 | style="text-align:right;"|9.35 |- | Haus Sachsen Pond | ''Haus Sachsener Teich'' | style="text-align:right;"| | style="text-align:right;"| | style="text-align:right;"| |- | Herzberg Pond (Goslar) | ''Herzberger Teich (Goslar)'' | style="text-align:right;"| {{sort|1560|}} around 1560 | style="text-align:right;"|95,000 | style="text-align:right;"|12.00 |- | God's Help Pond | ''Hilfe-Gottes-Teich'' | style="text-align:right;"| {{sort|1763|}} before 1763 | style="text-align:right;"|12,300 | style="text-align:right;"|8.30 |- | Stag Pond | ''Hirschler Teich'' | style="text-align:right;"| {{sort|1671|}} before 1671 | style="text-align:right;"|599,000 | style="text-align:right;"|11.40 |- | Smelter Pond, Zellerfeld | ''Hüttenteich, Zellerfeld'' | style="text-align:right;"| {{sort|1673|}} before 1673 | style="text-align:right;"|13,000 | style="text-align:right;"|6.42 |- | Smelter Pond, Altenau | ''Hüttenteich, Altenau'' | style="text-align:right;"|1688 | style="text-align:right;"|49,000 | style="text-align:right;"|11.73 |- | Huttal Pond, Upper (†) | ''Huttaler Teich, Oberer'' (†) | style="text-align:right;"| | style="text-align:right;"| | style="text-align:right;"| |- | Huttal Pond, Lower (†) | ''Huttaler Teich, Unterer'' (†) | style="text-align:right;"| | style="text-align:right;"| | style="text-align:right;"| |- | [[Jägersbleek Pond]] | ''Jägersbleeker Teich'' | style="text-align:right;"| {{sort|1670|}} around 1670 | style="text-align:right;"|380,000 | style="text-align:right;"|13.65 |- | Johann Friedrich Pond | ''Johann-Friedricher Teich'' | style="text-align:right;"|1674 | style="text-align:right;"|96,000 | style="text-align:right;"|6.79 |- | Carp Pond (Hahnenklee) (†) | ''Karpfenteich (Hahnenklee)'' (†) | style="text-align:right;"|before 1680 | style="text-align:right;"| | style="text-align:right;"| |- | Upper Kellerhals Pond | ''Kellerhalsteich, Oberer'' | style="text-align:right;"| {{sort|1679|}} before 1679 | style="text-align:right;"|68,000 | style="text-align:right;"|10.78 |- | Middle Kellerhals Pond | ''Kellerhalsteich, Mittlerer'' | style="text-align:right;"|1724 | style="text-align:right;"|436,000 | style="text-align:right;"|14.90 |- | Lower Kellerhals Pond, | ''Kellerhalsteich, Unterer'' | style="text-align:right;"| {{sort|1679|}} before 1679 | style="text-align:right;"|53,000 | style="text-align:right;"|8.10 |- | Kiefhölz Pond | ''Kiefhölzer Teich'' | style="text-align:right;"| {{sort|1671|}} before 1671 | style="text-align:right;"|248,000 | style="text-align:right;"|9.72 |- | Klein-Clausthal Pond | ''Klein-Clausthaler Teich'' | style="text-align:right;"|around 1680 | style="text-align:right;"|29,000 | style="text-align:right;"|8.34 |- | Little Crane Pond, | ''Kranicher Teich, Kleiner'' | style="text-align:right;"| {{sort|1675|}} before 1675 | style="text-align:right;"|11,000 | style="text-align:right;"|2.47 |- | Great Crane Pond, | ''Kranicher Teich, Großer'' | style="text-align:right;"| {{sort|1675|}} before 1675 | style="text-align:right;"|110,000 | style="text-align:right;"|8.24 |- | Kreuzbach Pond | ''Kreuzbacher Teich'' | style="text-align:right;"| {{sort|1680|}} before 1680 | style="text-align:right;"|9,000 | style="text-align:right;"|5.58 |- | Kuttelbach Pond | ''Kuttelbacher Teich'' | style="text-align:right;"|1674 | style="text-align:right;"|163,000 | style="text-align:right;"|12.75 |- | Lange Pond | ''Lange Teich'' | style="text-align:right;"|1719 | style="text-align:right;"|15,000 | style="text-align:right;"|6.73 |- | Langer Pond | ''Langer Teich'' | style="text-align:right;"| {{sort|1606|}} before 1606 | style="text-align:right;"|49,000 | style="text-align:right;"|7.30 |- | Upper Nassenwiese Pond | ''Nassenwieser Teich, Oberer'' | style="text-align:right;"| {{sort|1671|}} around 1671 | style="text-align:right;"|132,000 | style="text-align:right;"|8.82 |- | Lower Nassenwiese Pond (†) | ''Nassenwieser Teich, Unterer'' (†) | style="text-align:right;"| {{sort|1743|}} before 1743 | style="text-align:right;"|48,000 | style="text-align:right;"|6.0 |- | New Pond (Lautenthal)(†) | ''Neue Teich (Lautenthal)'' (†) | style="text-align:right;"| {{sort|1681|}} after 1680 | style="text-align:right;"|11,800 | style="text-align:right;"|5.8 |- | Oder Pond | ''[[Oderteich]]'' | style="text-align:right;"| {{sort|1715|}} 1715-1721 | style="text-align:right;"|1,670,000 | style="text-align:right;"|18.00 |- | Little Oker Pond | ''Okerteich, Kleiner'' | style="text-align:right;"| | style="text-align:right;"|22,000 | style="text-align:right;"| |- | Upper Peacock Pond | ''Pfauenteich, Oberer'' | style="text-align:right;"| {{sort|1551|}} before 1551 | style="text-align:right;"|121.000 | style="text-align:right;"|8.27 |- | [[Middle Peacock Pond]] | ''Pfauenteich, Mittlerer'' | style="text-align:right;"| {{sort|1551|}} before 1551 | style="text-align:right;"| 259.000 | style="text-align:right;"| 9.53 |- | Lower Peacock Pond | ''Pfauenteich, Mittlerer'' | style="text-align:right;"| {{sort|1551|}} before 1551 | style="text-align:right;"|214,000 | style="text-align:right;"|8.94 |- | Pixhai Pond | ''Pixhaier Teich'' | style="text-align:right;"|1672 | style="text-align:right;"|281,000 | style="text-align:right;"|8.75 |- | Polster Valley Pond | ''Polstertaler Teich'' | style="text-align:right;"|1728 | style="text-align:right;"|46,000 | style="text-align:right;"|6.48 |- | Prince's Pond | ''Prinzenteich'' | style="text-align:right;"|1686 | style="text-align:right;"|385,000 | style="text-align:right;"|8.74 |- | Röhre Pond | ''Röhrenteich'' | style="text-align:right;"| | style="text-align:right;"| | style="text-align:right;"| |- | [[Lower Schalke Pond]] | ''(Unterer) Schalker Teich'' | style="text-align:right;"|1730 | style="text-align:right;"|151,000 | style="text-align:right;"|11.28 |- | Middle Schalke Pond (†) | ''Schalker Teich, Mittlerer'' | style="text-align:right;"| | style="text-align:right;"| | style="text-align:right;"| |- | Upper Schalke Pond (†) | ''Schalker Teich, Oberer'' | style="text-align:right;"| | style="text-align:right;"| | style="text-align:right;"| |- | Schlacke Valley Pond | ''Schlackentaler Teich'' | style="text-align:right;"| | style="text-align:right;"|3,200 | style="text-align:right;"| |- | Schröterbach Pond | ''Schröterbacher Teich'' | style="text-align:right;"|1652 | style="text-align:right;"|73,000 | style="text-align:right;"|9.06 |- | Schwarzenbach Pond | ''Schwarzenbacher Teich'' | style="text-align:right;"| {{sort|1608|}} before 1608 | style="text-align:right;"|146,000 | style="text-align:right;"|7.39 |- | Semmelwiese Pond | ''Semmelwieser Teich'' | style="text-align:right;"|1691 | style="text-align:right;"|53.000 | style="text-align:right;"|7.24 |- | [[Silver Pond]] | ''[[Silberteich]]'' | style="text-align:right;"|1755 | style="text-align:right;"|22,000 | style="text-align:right;"|8.0 |- | Upper Spiegelthal Pond | ''Spiegelthaler Teich, Oberer'' | style="text-align:right;"| {{sort|1673|}} before 1673 | style="text-align:right;"|51,000 | style="text-align:right;"|7.67 |- | Lower Spiegelthal Pond | ''Spiegelthaler Teich, Unterer'' | style="text-align:right;"|1672 | style="text-align:right;"|152,000 | style="text-align:right;"|10.91 |- | Stadtweg Pond | ''Stadtweger Teich'' | style="text-align:right;"|1727 | style="text-align:right;"|294,000 | style="text-align:right;"|10.12 |- | Stuffen Valley Pond (†) | ''Stuffentaler Teich'' (†) | style="text-align:right;"| | style="text-align:right;"| | style="text-align:right;"| |- | [[Marsh Pond]] (Buntenbock) | ''Sumpfteich (Buntenbock)'' | style="text-align:right;"| {{sort|1639|}} before 1639 | style="text-align:right;"|189,000 | style="text-align:right;"|6.91 |- | Than Pond | ''Than-Teich'' | style="text-align:right;"| {{sort|1683|}} before 1684 | style="text-align:right;"|12,000 | style="text-align:right;"|6.45 |- | Sandpiper Pond | ''Wasserläufer Teich'' | style="text-align:right;"| {{sort|1659|}} before 1659 | style="text-align:right;"|25,000 | style="text-align:right;"|5.78 |- | Wiesenbeke Pond (Bad Lauterberg) | ''Wiesenbeker Teich (Bad Lauterberg)'' | style="text-align:right;"|1715 | style="text-align:right;"|480,000 | style="text-align:right;"|14.50 |- | Zankwiese Pond | ''Zankwieser Teich'' | style="text-align:right;"|1688 | style="text-align:right;"|107,000 | style="text-align:right;"|9.67 |- | Upper Mine Pond | ''Zechenteich, Oberer'' | style="text-align:right;"| {{sort|1661|}} before 1661 | style="text-align:right;"|33,000 | style="text-align:right;"|5.85 |- | Middle Mine Pond | ''Zechenteich, Mittlerer'' | style="text-align:right;"| {{sort|1661|}} before 1661 | style="text-align:right;"|45,000 | style="text-align:right;"|6.70 |- | Ziegenberg Pond | ''Ziegenberger Teich'' | style="text-align:right;"| {{sort|1645|}} around 1645 | style="text-align:right;"|313,000 | style="text-align:right;"|8.94 |- |} (†) means: pond out of service, largely dry. Dam remains exist.
Where no data is given, this usually indicates that the pond ended up in other hands before the mines closed and has not been precisely documented.
== See also == {{portal|Harz}} * [[Upper Harz]] * [[Upper Harz Water Regale]] * [[Upper Harz Water Tunnels]] * [[Upper Harz Ditches]] * [[List of lakes in Germany]] *''[[Kunstteich]]''
== Sources == * Friedrich, Ernst Andreas (1982): ''Gestaltete Naturdenkmale Niedersachsens'', Landbuch-Verlag, Hannover 1982. {{ISBN|3-7842-0256-X}}
== External links == * [http://www.wissenschaft-technik-ethik.de/clausthal-zellerfeld_teiche.html Ponds around Clausthal-Zellerfeld, Buntenbock and Hahnenklee]
[[Category:Reservoirs in Lower Saxony|Upper Harz Ponds]] [[Category:Upper Harz Water Regale|·]]