This study describes an economic model in the Guadalquivir river basin (Southern Spain) that considers inter-sectoral and hydrological effects of changes in water use as a response to various water-pricing policy scenarios. The main economic variables include water use, gross regional product, return flows in the river basin, and employment at sectoral and basin levels. The response of the different sectors to water pricing and of the sectoral productivity is derived from official data. The background of the model is based on previous research for the implementation of the UN System of Environmental-Economic Accounts and on the application of this framework to the Guadalquivir basin. Results based on the elicited curves illustrate that the structure of the demand function for irrigated agriculture passes from inelastic to elastic sections, while the function corresponding to the remaining economic sectors shows a continuous decreasing function with minor change in the elasticity structure of the curve. Results show that the impact of extreme measures of water pricing reduces water abstraction by up to 42% vs. the baseline scenario, with an economic reduction in regional Gross Domestic Product (GDP) of 1%.

中文翻译：

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用于分析水价情景的瓜达尔基维尔河流域的简化水文经济模型

本研究描述了瓜达尔基维尔河流域（西班牙南部）的一个经济模型，该模型将用水变化的跨部门和水文影响作为对各种水定价政策情景的回应。主要的经济变量包括用水、区域生产总值、流域的回流以及部门和流域层面的就业。不同部门对水价和部门生产力的反应来自官方数据。该模型的背景基于之前对联合国环境经济账户系统实施的研究以及该框架在瓜达尔基维尔盆地的应用。基于导出曲线的结果表明，灌溉农业的需求函数结构从无弹性部分过渡到弹性部分，而其余经济部门对应的函数则表现为连续递减函数，曲线的弹性结构变化很小。结果表明，与基准情景相比，极端水价措施的影响减少了高达 42% 的取水量，使区域国内生产总值 (GDP) 的经济减少了 1%。