Motion charts for visualising long-term water quality in South African rivers

摘要

Low rainfall and runoff, together with rapid urban, mining and industrial expansion during the past 120 years, have caused many South African watercourses to become virtual conduits for waste during periods of low flow (Turton, 2008). The poor quality of water affects downstream users and the aquatic environment. Working within budgetary constraints, water resource managers are compelled to make optimal use of whatever water quality data is available for managing this difficult situation.