Author(s)

S.Rahman, D.Al Bakri

Abstract

Impact of point sources and diffuse sources on stormwater quality in Orange, NSW, Australia S. Rahman and D.A. Bakri The University of Sydney, Orange, Australia Abstract This paper assesses the relative contribution of point sources, mainly the effluent of the Orange Sewerage Treatment Plant (STP), and diffuses sources from rural and urban areas on the overall quality of stormwater from Orange urban catchment. A comprehensive water quality-monitoring program was carried out between November 1998 and March 2000. Results show that the urban creeks are enriched with total phosphorus, total nitrogen and ammonia. Nutrient level in the creeks exceeded the recommended level [1] even before reaching the central business district (CBD). Provided that other factors are conducive, phosphorus and nitrogen enrichment in water can induce higher plant growth in the aquatic system, including toxic cynobacterial blooms. The stormwater quality was flow dependent as the bulk of pollutan

Keywords