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Water 2012, 4(4), 848-868; doi:10.3390/w4040848
Article

Scenario Planning to Address Critical Uncertainties for Robust and Resilient Water–Wastewater Infrastructures under Conditions of Water Scarcity and Rapid Development

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Received: 13 September 2012; in revised form: 9 October 2012 / Accepted: 29 October 2012 / Published: 5 November 2012
(This article belongs to the Special Issue Sustainable Water Systems)
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Abstract: Ensuring water availability for multiple needs represents a sustainable development challenge globally. Rigid planning for fixed water supply and reuse targets with estimated demand growth and static assumptions of water availability can prove inflexible in responding to changing conditions. Formal methods to adaptively respond to these challenges are needed, particularly in regions with limited natural resources and/or where multiple uncertain forces can influence water-resource availability and supply reliability. This paper assesses the application of Scenario Planning in one such region—Tucson, Arizona, USA—over the coming 40 years, and highlights broader lessons for addressing complex interrelationships of water management, infrastructure development, and population growth. Planners from multiple jurisdictions and researchers identified ten key forces and prioritized three with the greatest uncertainty and the greatest impact for water and development planning: (1) changing demands based on potential future density, layout, and per capita water use/reuse; (2) adequacy of current water supplies to meet future demands; and (3) evolving public perceptions of water reuse including potential options to supplement potable water supplies. Detailed scenario modeling using GIS and infrastructure cost optimization is under development and is now beginning to produce results, to be discussed in future publications. The process has clearly demonstrated the value of Scenario Planning as a tool for bringing stakeholders into agreement over highly complex and historically divisive problems, and for prioritizing amongst diverse uncertainties. The paper concludes by characterizing possible outcomes for this case and draws lessons for other water scarce regions experiencing rapid development.
Keywords: scenario planning; sustainable development; robustness; resilience; water reuse; uncertainty; adaptive management scenario planning; sustainable development; robustness; resilience; water reuse; uncertainty; adaptive management
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Scott, C.A.; Bailey, C.J.; Marra, R.P.; Woods, G.J.; Ormerod, K.J.; Lansey, K. Scenario Planning to Address Critical Uncertainties for Robust and Resilient Water–Wastewater Infrastructures under Conditions of Water Scarcity and Rapid Development. Water 2012, 4, 848-868.

AMA Style

Scott CA, Bailey CJ, Marra RP, Woods GJ, Ormerod KJ, Lansey K. Scenario Planning to Address Critical Uncertainties for Robust and Resilient Water–Wastewater Infrastructures under Conditions of Water Scarcity and Rapid Development. Water. 2012; 4(4):848-868.

Chicago/Turabian Style

Scott, Christopher A.; Bailey, Christopher J.; Marra, Ralph P.; Woods, Gwendolyn J.; Ormerod, Kerri Jean; Lansey, Kevin. 2012. "Scenario Planning to Address Critical Uncertainties for Robust and Resilient Water–Wastewater Infrastructures under Conditions of Water Scarcity and Rapid Development." Water 4, no. 4: 848-868.


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