Along stream banks in the Bronx, a combination of structural and vegetative techniques are used to stabilize sections of eroding bank. Where stability is needed quickly, for example where a trail needs to be protected, structures, or revetments, are constructed using boulder of native rock and large pieces of wood. Where hard structures are used, plant material is installed in any adjacent exposed soil. Where possible, structures are built to provide overhanging areas of cover for aquatic organisms. On straight, less steep sections of bank not as susceptible to scour, woody vegetation is planted to stabilize soil and prevent erosion.