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Evaluating alternatives for mitigating Cryptosporidium risk and generating environmental service benefits in water supply catchments


  • Kandulu, John
  • Bryan, Brett


Evaluations of pathogen management options have focussed on assessing relative removal effectiveness as a basis for prioritising alternative management investment decisions. Using a case study of the Myponga catchment, South Australia, this paper presents results of a cost-effectiveness risk analysis of 13 catchment- and treatment-based water quality management alternatives for mitigating Cryptosporidium risk. A range of costs and benefits including set-up and operating costs, farm business costs and benefits, and environmental service benefits are considered in comparing the net cost associated with each management alternative. Considering the broader range of costs and benefits changes the relative cost-effectiveness of water quality management alternatives significantly. Combinations of catchment- and treatment-based management alternatives proved to be relatively more cost-effective at mitigating Cryptosporidium risk. Specifically, the combination of spatially targeted water course management upstream of the catchment with reservoir treatment by ultra-violet radiation provides a cost-effective Cryptosporidium risk mitigation strategy especially when the adoption of dung beetles and treatment by enhanced coagulation are included as complementary low cost alternatives. Considering the broader range of costs and benefits enhances the potential to increase the cost-effectiveness of investment in Cryptosporidium risk mitigation as well as produce a range of significant secondary benefits for water quality, biodiversity, and carbon sequestration.

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  • Kandulu, John & Bryan, Brett, 2009. "Evaluating alternatives for mitigating Cryptosporidium risk and generating environmental service benefits in water supply catchments," 2009 Conference (53rd), February 11-13, 2009, Cairns, Australia 48190, Australian Agricultural and Resource Economics Society.
  • Handle: RePEc:ags:aare09:48190

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    1. Ing-Marie Gren & Paul Jannke & Katarina Elofsson, 1997. "Cost-Effective Nutrient Reductions to the Baltic Sea," Environmental & Resource Economics, Springer;European Association of Environmental and Resource Economists, vol. 10(4), pages 341-362, December.
    2. Elofsson, Katarina, 2003. "Cost-effective reductions of stochastic agricultural loads to the Baltic Sea," Ecological Economics, Elsevier, vol. 47(1), pages 13-31, November.
    3. Connor, Jeffery D. & Ward, John & Clifton, Craig & Proctor, Wendy & Hatton MacDonald, Darla, 2008. "Designing, testing and implementing a trial dryland salinity credit trade scheme," Ecological Economics, Elsevier, vol. 67(4), pages 574-588, November.
    4. Ribaudo, Marc O. & Heimlich, Ralph & Claassen, Roger & Peters, Mark, 2001. "Least-cost management of nonpoint source pollution: source reduction versus interception strategies for controlling nitrogen loss in the Mississippi Basin," Ecological Economics, Elsevier, vol. 37(2), pages 183-197, May.
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