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Economic Impacts of Water Scarcity under Diverse Water Salinities

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  • Baum, Zvi
  • Palatnik, Ruslana Rachel
  • Kan, Iddo
  • Rapaport-Rom, Mickey

Abstract

Exploitation of alternative water sources is expected to grow in the decades to come in waterstressed countries with fast population growth, especially in regions where a further decline of natural freshwater availability is expected due to climate change. Increasing utilization of nonfreshwater usually leads to salinity build-up in fields and water sources as well as accumulation of various pollutants - both having a considerable impact on the suitability of non-freshwater for irrigation due to constraints associated with crop salinity tolerance and food safety regulations. We developed a linked CGE - farm-level model of a water economy with representation for multiple water types characterized by different qualities. We employ the model to assess the impact of water shortage on the Israeli economy, where a steadily growing water scarcity is leading to an increasing utilization of alternative water sources. We simulate water shortage scenarios based on the Long Term National Master Plan for The Water Economy developed by the Israeli Water Authority (IWA). The linked CGE - farm-level model provides a mechanism for estimating the Constant Elasticity of Substitution (CES) rates between different irrigation water types used in agriculture. This mechanism accounts for the effects of salinity on yields and takes into consideration food safety regulations for irrigating crops with treated wastewater. We demonstrate that, in contrast to previous studies, CES rates between different water types are not identical. The CES rates obtained in our study have relatively low values, which can be attributed to the constraints associated with crop salinity tolerance and food safety regulations. Our results reveal that water shortage can lead to a significant decline of Israel’s GDP, where a considerable part of the decline is attributed to the decrease in agricultural outputs. The magnitude of the impact depends on the underlying assumptions regarding future desalination capacity. To further study the effect of desalination, we run simulations under various desalination levels and examine its impact on the GDP. We also examine the extent to which the impact of water shortage is sensitive to CES rates between different irrigation water types.

Suggested Citation

  • Baum, Zvi & Palatnik, Ruslana Rachel & Kan, Iddo & Rapaport-Rom, Mickey, 2015. "Economic Impacts of Water Scarcity under Diverse Water Salinities," Discussion Papers 290040, Hebrew University of Jerusalem, Department of Agricultural Economics and Management.
    • Handle: RePEc:ags:huaedp:290040
    DOI: 10.22004/ag.econ.290040
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    Cited by:

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    2. Yerushalmi, Erez, 2018. "Using Water Allocation in Israel as a Proxy for Imputing the Value of Agricultural Amenities," Ecological Economics, Elsevier, vol. 149(C), pages 12-20.
    3. Teotónio, Carla & Rodríguez, Miguel & Roebeling, Peter & Fortes, Patrícia, 2020. "Water competition through the ‘water-energy’ nexus: Assessing the economic impacts of climate change in a Mediterranean context," Energy Economics, Elsevier, vol. 85(C).
    4. Luckmann, Jonas & Reznik, Ami & Feinerman, Eli & Finkelshtain, Israel & Grethe, Harald & Kan, Iddo, 2016. "Combining the best of two worlds - An integrative water modelling approach," Conference papers 332758, Purdue University, Center for Global Trade Analysis, Global Trade Analysis Project.
    5. Ortuzar, Iban & Serrano, Ana & Xabadia, Àngels, 2023. "Macroeconomic impacts of water allocation under droughts. Accounting for global supply chains in a multiregional context," Ecological Economics, Elsevier, vol. 211(C).

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