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- W144585133 abstract "This study encompassed work on four of the Environment Protection Authority (EPA) licensed discharge points at the Port Kembla Steelworks (PKSW). These included the North Gate Drain, the Main Drain, the Flat Products East No.1 Drain and the Ironmaking East Drain. This study incorporated a hydrological study of the drains, and a stormwater discharge water quality study. The aims of the hydrological component were: to obtain an understanding of the behaviour of each of these drains during rainfall events; to determine fractions of runoff compared to rainfall volume; to determine the influence antecedent precipitation has on the discharge of each drain; and, to relate the findings to catchment type. The aims of the water quality component were: to determine the concentrations of priority pollutants in licensed drains during wet weather and the first flush; to determine the likely source of any stormwater borne contaminants; and, to use the water quality data to determine appropriate wet weather licence limits. These aims were developed to assist in the design of further investigations involving stormwater management at PKSW. This study encompassed 16 months of stormwater monitoring and involved the collection of over 1300 samples. The findings were that Flat Products East No.1 Drain and Iron Making East Drain displayed very similar characteristics during rainfall events. Both exhibit ‘flashy’ hydrographs, with fast response to rainfall, and steep recession curves where return to ‘baseline’ or process flow is rapid. The fraction of discharge compared to total rainfall volume (falling on the catchment) for both these drains was high (>80%). Their small catchments, containing almost entirely sealed impervious surfaces, led to very small water losses. The Flat Products East No.1 Drain and Iron Making East Drain discharge volumes, during rainfall, were found to be unaffected by antecedent rainfall. The Main Drain was found to have a delayed response to rainfall. The Main Drain and the North Gate Drain hydrographs displayed slow receding recession curves where the elevated flow continued for hours after the rainfall events had ceased. The fraction of discharge compared to total rainfall volume (falling on the catchment) for the Main Drain was found to be small, indicating large water losses to infiltration and percolation to groundwater recharge via the relatively large grassed and unsealed, pervious areas within the catchment. An anomaly was found in this fraction for the North Gate Drain due to overestimations in discharge rates from online monitoring" @default.
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- W144585133 date "2005-01-01" @default.
- W144585133 modified "2023-09-27" @default.
- W144585133 title "Stormwater impacts on discharge water quality in licensed drains at the Port Kembla Steelworks" @default.
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