One of the duties of watercourse States is that they shall, individually and, where appropriate, jointly through cost-sharing by the watercourse State or States that may be affected, make every effort to take all appropriate measures to prevent or mitigate conditions related to the watercourse system that may be harmful to other watercourse States, regardless of whether resulting from human conduct or natural causes, such as flood conditions, invasive water weeds, water-borne disease, siltation, erosion, drought or desertification. In implementing this duty, watercourse States shall take into account guidelines developed by competent international organizations, particularly with regard to the existing watercourse organization.