The downstream externalities of harvesting rainwater in semi-arid watersheds: An Indian case study

被引：51

作者：

Bouma, Jetske A. ^{[1
]}

Biggs, Trent W. ^{[2
]}

Bouwer, Laurens M. ^{[1
]}

机构：

[1] Vrije Univ Amsterdam, Inst Environm Studies, Amsterdam, Netherlands

[2] San Diego State Univ, Dept Geog, San Diego, CA 92182 USA

来源：

AGRICULTURAL WATER MANAGEMENT | 2011年 / 98卷 / 07期

关键词：

Downstream externalities; Watershed development; Groundwater irrigation; Water re-allocation; Cost benefit analysis; Monte Carlo simulation; IRRIGATION WATER; GROUNDWATER; DEPLETION; IMPACTS; BALANCE;

D O I：

10.1016/j.agwat.2011.02.010

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

Water-related investment projects affect downstream water availability, and therefore should account for these externalities. Few projects do, however, owing to lack of awareness, lack of data and difficulty in linking upstream investments to downstream effects. This article assesses the downstream impacts of rainwater harvesting in a semi-arid basin in Southern India, focusing on the trade-offs that arise when crop water use is re-allocated from a downstream surface water irrigation system to groundwater irrigated agriculture upstream. The results indicate that the downstream impacts are considerable and that net benefits are insufficient to pay back investment costs. Further research is required to reduce the uncertainties in the water balance of irrigation systems at basin level, to account for the inter-annual variability of crop water availability and to elaborate the wider welfare effects. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：1162 / 1170

页数：9

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