Greenhouse gas implications of water reuse in the Upper Pumpanga River Integrated Irrigation System, Philippines
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 (0.19kggrain/m3) is 21% higher than without water reuse (0.15kggrain/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.
Year of publication: |
2010
|
---|---|
Authors: | Maraseni, Tek Narayan ; Mushtaq, Shahbaz ; Hafeez, Mohsin ; Maroulis, Jerry |
Published in: |
Agricultural Water Management. - Elsevier, ISSN 0378-3774. - Vol. 97.2010, 3, p. 382-388
|
Publisher: |
Elsevier |
Keywords: | Water scarcity Water balance Water productivity Rice Greenhouse gas Irrigation |
Saved in:
Online Resource
Saved in favorites
Similar items by person
-
Energy and water tradeoffs in enhancing food security: A selective international assessment
Mushtaq, Shahbaz, (2009)
-
Energy and water tradeoffs in enhancing food security: A selective international assessment
Mushtaq, Shahbaz, (2009)
-
Energy and water tradeoffs in enhancing food security: A selective international assessment
Mushtaq, Shahbaz, (2009)
- More ...