The document provides details from a field study of biotopes along the Hoeng Boestrup River in 2007, including measurements of water quality, light intensity, and observations of local plants and animals. Key species observed include the mute swan, wood pigeon, mallard duck, mayfly, crayfish, various snails and worms. Water quality measurements included pH, sodium, and phosphate levels. Plant life noted included reeds, water thyme, dead-nettle, and forget-me-nots.