the call for a water reservoir quickly became shrill.

A glance at the Upper Harz 'ponds' (Teiche) near Clausthal-Zellerfeld and Hahnenklee suggested a solution. At that time there must have been 50 to 60 small reservoirs in operation. Their design, however, could not simply be copied, because there was nowhere in the vicinity of the Oderteich to cut grass sods like those used to seal the dams of the Upper Harz reservoirs.

In the meantime, the Rehberg

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