Windbach is a small river of Hesse, Germany. It flows into the Aar near Aarbergen. Rising in the western Taunus foothills near Kettenbach (50ð14â²53â³N 8ð06â²54â³E), this third-order stream flows southeast through a predominantly agricultural catchment before its confluence with the Aar at Aarbergen (50ð14â²53â³N 8ð06â²54â³E). With an average discharge of 0.12 mó/s and a gradient of 1.8%, the Windbach exhibits a pluvial-nival flow regime characteristic of mid-altitude Central European streams. Its riparian zone supports typical floodplain vegetation communities dominated by Alnus glutinosa (European alder) and Salix spp. (willows), as documented in Hesse's small watercourse monitoring program.