Rotselaar is a municipality located in the Belgian province of Flemish Brabant . This is the official logo of the municipality of Rotselaar used by the municipal government . This is the meaning of the logo : the keep `` Ter Heide '' is the symbol for the cultural heritage of Rotselaar , the field tracks symbolise the rural aspects of the municipality and the agriculture , the blue river is the symbol for the three rivers of Rotselaar , the Demer , the Dijle and the Winge , and the lake , the green represents the natural environment and nature reserves of Rotselaar , the plantations and the hills covered with forests , and last but not least , the sun gives Rotselaar blossoming vineyards and refers to the recreational facilities and activities in Rotselaar .