Water Science & Technology Vol 66 No 4 pp 879886 © IWA Publishing 2012 doi:10.2166/wst.2012.251
Can hydro-economic river basin models simulate water shadow prices under asymmetric access?
A. Kuhn and W. Britz
Institute for Food and Resource Economics, University of Bonn, Nussallee 21, 53115 Bonn, Germany E-mail: firstname.lastname@example.org
Hydro-economic river basin models (HERBM) based on mathematical programming are conventionally formulated as explicit ‘aggregate optimization’ problems with a single, aggregate objective function. Often unintended, this format implicitly assumes that decisions on water allocation are made via central planning or functioning markets such as to maximize social welfare. In the absence of perfect water markets, however, individually optimal decisions by water users will differ from the social optimum. Classical aggregate HERBMs cannot simulate that situation and thus might be unable to describe existing institutions governing access to water and might produce biased results for alternative ones. We propose a new solution format for HERBMs, based on the format of the mixed complementarity problem (MCP), where modified shadow price relations express spatial externalities resulting from asymmetric access to water use. This new problem format, as opposed to commonly used linear (LP) or non-linear programming (NLP) approaches, enables the simultaneous simulation of numerous ‘independent optimization’ decisions by multiple water users while maintaining physical interdependences based on water use and flow in the river basin. We show that the alternative problem format allows the formulation HERBMs that yield more realistic results when comparing different water management institutions.
Keywords: externalities; hydro-economic river basin model; mixed complementarity programming; water institutions
Full article (PDF Format)
eProduct: Buy this article for £24.00 (IWA MEMBER PRICE: £18.00)
All prices include VAT. For customers where VAT should not be applied, the VAT amount will be removed upon payment