 Complete the following phrase:  On 28 June 1888 the city parliament decided for Mächtigs design, who had to exchange his plans for exuberant water cascades by a more naturalistic waterfall. So Mächtig and the sculptor Albert Manthe travelled through the Giant Mountains visiting natural waterfalls to get inspired. Having returned Mächtig himself assisted by a confidant foreman started modelling and constructions for the park. The city parliament only approved Mächtigs altered waterfall designs on 25 March 1891. Using the topography of a former sand pit Mächtig designed a highland-like waterfall on the northern slope of the Kreuzberg directed in its axis towards Großbeerenstraße, named after 