Development of a Catchment Water Quality Model for Continuous Simulations of Pollutants Build-up and Wash-off
Estimation of runoff water quality parameters is required to determine appropriate water quality management options. Various models are used to estimate runoff water quality parameters. However, most models provide event-based estimates of water quality parameters for specific sites. The work presented in this paper describes the development of a model that continuously simulates the accumulation and wash-off of water quality pollutants in a catchment. The model allows estimation of pollutants build-up during dry periods and pollutants wash-off during storm events. The model was developed by integrating two individual models; rainfall-runoff model, and catchment water quality model. The rainfall-runoff model is based on the time-area runoff estimation method. The model allows users to estimate the time of concentration using a range of established methods. The model also allows estimation of the continuing runoff losses using any of the available estimation methods (i.e., constant, linearly varying or exponentially varying). Pollutants build-up in a catchment was represented by one of three pre-defined functions; power, exponential, or saturation. Similarly, pollutants wash-off was represented by one of three different functions; power, rating-curve, or exponential. The developed runoff water quality model was set-up to simulate the build-up and wash-off of total suspended solids (TSS), total phosphorus (TP) and total nitrogen (TN). The application of the model was demonstrated using available runoff and TSS field data from road and roof surfaces in the Gold Coast, Australia. The model provided excellent representation of the field data demonstrating the simplicity yet effectiveness of the proposed model.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1084178Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 2713
 A. O. Akan and R. J. Houghtalen, Urban hydrology, hydraulics and stormwater quality- Engineering application and computer modelling, New Jersey: John-Willey and sons, Inc., 2003.
 S. B. Shaw, M. T. Walter and T. S. Steenhius, A physical model of particulate wash-off from rough impervious surface, Journal of Hydrology: 327, p. 618-626, 2006.
 P. Egodawatta, E. Thomas and A. Gonnetilleke, Understanding the physical processes of pollutant build-up and wash-off on roof surfaces, Science of Total Environment: 407, p. 1834-1841, 2009.
 J. Vaze and F. H. S. Chew, Experimental study of pollutant accumulation on an urban road surface, Urban Water: 4, p. 379-389, 2002.
 T. Kokken, H. Koivusalo, T. Karvonen and A. Lepisto, A semi-distributed approach to rainfall-runoff modelling- aggregating responses from hydrologically similar areas, International Congress on Modelling and Simulation Proceedings, 1999. Modelling and Simulation Society of Australia and New Zealand Inc.:University of Waikato, New Zealand.
 N. Christophersen and R. R. Wright, Sulphate budget and a model for sulfate concentrations in stream water at Birkenes, a small forested catchment in southern Norway, Water Resource Research: 17(2), p. 377-389, 1981.
 V. M. Ponce, Engineering hydrology, principles and practices, Prentice Hall: 1989.
 A. R. Shokoohi, A new approach for isochrone mapping in one dimensional flow for using in time area method, Journal of Applied Sciences: 8(3), p. 516-521, 2008.
 CRC for Catchment Hydrology, How much rainfall becomes runoff?: Loss modelling for flood estimation, 1998.
 A. Rahman, P. E. Weinmnn, T. M. T. Hoang and E. M. Laurenson Monte carlo simulation of flood frequency curves from rainfall, Journal of Hydrology: 256(3-4), p. 196-210, 2002.
 M. Ilahee, M. A. Imteaz, Imrpoved continuing losses estimation using initial loss-continuing loss model for medium sized rural catchments, American Journal of Engineering and Applied Sciences: 2(4), p. 796- 803, 2009.
 D. F. Kibler, Urban stormwater hydrology, American Geophysical Union: Washington DC, 1982.
 L. A. Rossman, SWMM (Stormwater Management Model) version 5 user-s manual, Washington DC: EPA (Environmental Protection Agency), United States, 2004.
 R. J. Charbeneau, M. E. Barret, Evalutation of methods for estimating stormwater pollutant loads, Water Environment Research: 70(7), pg. 1295-1302, 1998.
 I. E. Ball, R. Jenks and D. Aubourg An assessment of the availability of pollutant constituents on road surfaces, Science of the Total Environment: 209(2-3), p. 243-254, 1998.
 P. Egodawatta, Translation of small-plot scale pollutant build-up and wash-off measurements to urban catchment scales, Faculty of Built Environment and Engineering, Queensland University of Technology,2007.
 M. Grottker, Runoff quality from a street with medium traffic loading, Science of the Total Environment: 59(C), p. 457-466, 1987.
 J. D. Sartor, G. B. Boyd and F. J. Agardy, Water pollutants aspects of street surface contaminants, Journal of Water Pollution Control Federation: 46(3), p. 458-467, 1974.
 I,E.Aust, Australian rainfall and runoff, Institute of Engineers Australia, 1998.
 V. A. Tsihrintzis, R. Hamid, Modelliing and management of urban stormwater runoff quality: A review, Water Resources Management: 11(2), p. 137-164, 1997.
 A. B. Deletic, A. T. Maksimovic, Evaluation of water quality factors in storm runoff from paved areas, Journal of Environmental Engineering: 124(9), p. 869-879, 1998.
 L. H. Kim, R. Hamid, Estimating pollutant mass accumulation on highways during dry periods, Journal of Environmental Engineering: 132(9), p. 985-993, 2006.
 I. Hossain, M. A. Imteaz, Development of a deterministic catchment water quality model, Paper presented at the "32nd Hydrology and Water Resources Symposium", Newcastle: 2009.
 I. Hossain, M. Imteaz, Catchment water quality model: Sensitivity analysis and parameter estimation, Paper presented at the "3rd European Water and Wastewater Management Conference", 22-23 September: 2009.