Greenhouse gas implications of water reuse in the Upper Pumpanga River Integrated Irrigation System, Philippines

Maraseni, Tek Narayan and Mushtaq, Shahbaz and Hafeez, Mohsin and Maroulis, Jerry (2010) Greenhouse gas implications of water reuse in the Upper Pumpanga River Integrated Irrigation System, Philippines. Agricultural Water Management, 97 (3). pp. 382-388. ISSN 0378-3774

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Enhancing water productivity is often recommended as a 'soft option' in addressing the problem of increasing water scarcity. However, improving water productivity, particularly through water reuse, incurs additional investment and may result in increased greenhouse gas (GHG) emissions. In this study, we analysed the water productivity and GHG implications of water reuse through pumping groundwater and creek water, and compare this with gravity-fed canal irrigation in the Upper Pampanga River
Integrated Irrigation System (UPRIIS) in the Philippines.
Water productivity indicators show that water reuse contributes significantly to water productivity. For example, water productivity with respect to gross inflow (WPgross) with water reuse (0.19 kg grain/m3) is 21% higher than without water reuse (0.15 kg grain/m3). However, there is a tradeoff between increasing water productivity and water reuse as water reuse increases GHG emissions. The estimated GHG emission from water reuse (pumping irrigation) is 1.47 times higher than without water reuse
(gravity-fed canal irrigation). Given increasing concerns about climate change and the need to reduce carbon emissions, we recommend that a higher priority be given to water reuse only in areas where water scarcity is a serious issue.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Author's version deposited in accordance with the copyright policy of the publisher.
Faculty / Department / School: Historic - Faculty of Business - No Department
Date Deposited: 04 Jan 2010 00:20
Last Modified: 02 Jul 2013 23:30
Uncontrolled Keywords: water scarcity; water balance; water productivity; rice; greenhouse gas; irrigation
Fields of Research : 07 Agricultural and Veterinary Sciences > 0701 Agriculture, Land and Farm Management > 070199 Agriculture, Land and Farm Management not elsewhere classified
07 Agricultural and Veterinary Sciences > 0799 Other Agricultural and Veterinary Sciences > 079901 Agricultural Hydrology (Drainage, Flooding, Irrigation, Quality, etc.)
09 Engineering > 0905 Civil Engineering > 090509 Water Resources Engineering
Socio-Economic Objective: D Environment > 96 Environment > 9609 Land and Water Management > 960905 Farmland, Arable Cropland and Permanent Cropland Water Management
Identification Number or DOI: 10.1016/j.agwat.2009.10.007

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