The German post commemorated the centennial of the foundation of Mohne Reservoir by the issue of a new stamp.
The industrial revolution of the 19th century led Germany within a short period to a complete transformation of the life and work and a previously unknown population growth. The shortcoming of the boom was depletion of ecological resources, especially in the urban centers. An acute water crisis took place in the Ruhr river basin in the late 19th century. Due to the extreme pollution of water by mines, water plants and heavy industry, the river was no longer capable to supply the region with sufficient water.
In July 1913, a few kilometers south of Soest, in the presence of the German Emperor, the most enormous water storage facility in Europe was inaugurated, Mohne Reservoir. With a storage capacity of about 130 million cubic meters of water and a storage area of 10 square kilometers, this "gigantic construction" had a greater capacity than all 20 dams that had been built up to this point in the catchment area of Ruhr and Wupper.
The Mohne Reservoir founded in 1913, also serves the recreational and biological diversity of Germany. The dam is now a major transit and wintering area for waterfowl birds in North Rhine-Westphalia.