Optimal groundwater management when recharge is declining: a method for valuing the recharge benefits of watershed conservation
Demand for water will continue to increase as per capita income rises and the population grows, and climate change can exacerbate the problem through changes in precipitation patterns and quantities, evapotranspiration, and land cover—all of which directly or indirectly affect the amount of water that ultimately infiltrates back into groundwater aquifers. We develop a dynamic management framework that incorporates alternative climate-change (and hence, recharge) scenarios and apply it to the Pearl Harbor aquifer system on O‘ahu, Hawai‘i. By calculating the net present value of water for a variety of plausible climate scenarios, we are able to estimate the indirect value of groundwater recharge that would be generated by watershed conservation activities. Enhancing recharge increases welfare by lowering the scarcity value of water in both the near term and the future, as well as delaying the need for costly alternatives such as desalination. For a reasonable range of parameter values, we find that the present value gain of maintaining recharge ranges from 31.1milliontoover1.5 billion.
|Date of creation:||Feb 2014|
|Date of revision:|
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- Basharat A. Pitafi & James A. Roumasset, 2009. "Pareto-Improving Water Management over Space and Time: The Honolulu Case," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 91(1), pages 138-153.
- Roumasset, James A. & Wada, Christopher A., 2012. "Ordering the extraction of renewable resources: The case of multiple aquifers," Resource and Energy Economics, Elsevier, vol. 34(1), pages 112-128.
- Darrell Krulce & James A. Roumasset & Tom Wilson, 1997. "Optimal Management of a Renewable and Replaceable Resource: The Case of Coastal Groundwater," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 79(4), pages 1218-1228.
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