Abstract
Environmental degradation is a widespread contemporary problem. It will be exacerbated by Greenhouse. The alteration of the land surface by humans is examined in terms of on-site impacts as well as off-site effects in other storages, notably rivers. Examples of bank erosion in the Hawkesbury-Nepean system are related to regime shifts, dams and dredging. Examples of environmental pollution by different forms of sewage disposal are given for Wollondilly Shire. It is suggested that much more relevant information is required to effect total catchment management.