Joint Management of an Interconnected Coastal Aquifer and Invasive Tree
Kimberly Burnett () and
Christopher Wada ()
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Sittidaj Pongkijvorasin: Chulalongkorn University
Kimberly Burnett: University of Hawaii Economic Research Organization
No 2017-8, Working Papers from University of Hawaii Economic Research Organization, University of Hawaii at Manoa
Kiawe (Prosopis pallida), a mesquite tree considered invasive in many parts of the world including Hawaiâ€˜i, has been shown to reduce regional groundwater levels via deep taproots. In areas where aquifers are primary sources of fresh water, kiawe control has the potential to be an integral component of water management planning. We develop an analytical dynamic framework for the joint management of kiawe and groundwater, and show that optimal water management depends on expected kiawe damages, while optimal kiawe removal depends on groundwater scarcity and removal cost. Using data from the KiÌ„holo aquifer on the west coast of Hawaiâ€˜i Island, we solve for joint management decisions with corresponding parameters related to kiawe damage and water scarcity. With 1.5% water demand growth, Kiawe should be removed if the removal cost is below $1,884/ha. Our numerical results indicate that kiawe damage is nonlinear in the rate of water demand growth. The damage costs can be attributed to three main factors. When demand growth is low, kiawe damage is driven by a higher water extraction cost. For moderate growth, the effect is compounded by anticipated future scarcity. Damage is amplified by a backstop cost effect when the growth rate is high.
Keywords: Prosopis pallida; kiawe; groundwater management; invasive species; KiÌ„holo (search for similar items in EconPapers)
Pages: 26 pages
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Journal Article: Joint Management of an Interconnected Coastal Aquifer and Invasive Tree (2018)
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Persistent link: https://EconPapers.repec.org/RePEc:hae:wpaper:2017-8
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