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Potential and versatility of WEAP model (Water Evaluation and Planning System) for hydrological assessments of AWD (Alternate Wetting and Drying) in irrigated rice

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Title Potential and versatility of WEAP model (Water Evaluation and Planning System) for hydrological assessments of AWD (Alternate Wetting and Drying) in irrigated rice
 
Creator Schneider, Pia
Sander, Björn Ole
Wassmann, Reiner
Asch, Folkard
 
Subject climate change
agriculture
food security
irrigation
modelling
water management
rice
 
Description The production of irrigated rice is increasingly challenged by freshwater scarcity. Water saving technologies such as Alternate Wetting and Drying (AWD) allow sustaining production levels under reduced water availability. Before implementing such innovations on a large scale, their hydrological impact on the system needs to be assessed.

This study investigated the applicability of the water management tool WEAP (Water Evaluation and Planning System) for evaluating the effects of AWD on water use and water resources at field and irrigation system level for two different case studies in Central Luzon, the Philippines.

In the first study, the Zeigler Experiment Station (ZES) of the International Rice Research Institute (IRRI) was used for parameterization of WEAP and field-scale assessment of AWD, making use of the availability of spatially and temporally highly resolved data. In the second study, WEAP was applied to an irrigation scheme in the Philippines, the Angat-Maasim River Irrigation System (AMRIS) to assess effects on up- and downstream water resources using lower resolution data.

Simulated AWD implementation during the dry season reduced water requirements by 12–27% and 34.3% on ZES and AMRIS, respectively. Additionally, AWD implementation enhanced streamflow in main and lateral canals, and thus increased water availability in the entire irrigation system. We also conducted an ex-ante assessment of future freshwater availability assuming reduced precipitation due to climate change effects alongside with irrigation supply at current levels. WEAP showed that water levels in the reservoir will substantially decline under these circumstances leading to severe water stress in AMRIS. Implementing AWD in such a scenario improved water availability in the system by up to 50%. WEAP proved to be a suitable tool for upscaling different irrigation techniques and assessing their impact on water resources on a large scale. Limitations of the approach and future possibilities for improvements are discussed.
 
Date 2019-09-01
2019-11-01T19:33:37Z
2019-11-01T19:33:37Z
 
Type Journal Article
 
Identifier Schneider P, Sander BO, Wassmann R, Asch F. 2019. Potential and versatility of WEAP model (Water Evaluation and Planning System) for hydrological assessments of AWD (Alternate Wetting and Drying) in irrigated rice. Agricultural Water Management 224:105559.
0378-3774
https://hdl.handle.net/10568/105617
https://doi.org/10.1016/j.agwat.2019.03.030
PII-FP3_CCAC
 
Language en
 
Rights Copyrighted; all rights reserved
Limited Access
 
Format 105559
 
Source Agricultural Water Management