Open AccessJournal Article
Design Shortcomings of the Headwork and Water Distribution and Control Facilities of the Canal Irrigation Systems of Ilocos Norte, Philippines
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TL;DR: The performances of 6 sample irrigation systems in Ilocos Norte showed an average dry season cropping intensity in crop year 2005–2006 of only 27%.
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Abstract: The performances of 2 National Irrigation Systems (NIS), 6 Communal Irrigation Systems (CIS) and 2 Small Water Impounding Projects (SWIP) in Ilocos Norte were evaluated from the standpoint of their dry season irrigation intensity, which is defined as the ratio of the actual area irrigated during the dry season to the irrigation service area. Some important design criteria and features of these sample irrigation systems were investigated to help explain their performances. Field observations of the existing physical structures of these systems were carried out to assess their overall capacity to convey and distribute the required water efficiently. Frequency analysis of the maximum rainfall totals measured at the nearest weather station during the period 1976–2005 was carried out to gain insights on the return periods of the 1-d, 2-d, 3-d and 4-d rainfall totals brought about by a typhoon that heavily damaged the headworks of two of the sample irrigation systems. The study showed an average dry season cropping intensity in crop year 2005–2006 of only 27%. This very low irrigation intensity can be partly attributed to the extensive damage of the dam of the Madongan River Irrigation System (RIS), the largest irrigation system within the province. The results of frequency analysis indicated that the 1-d, 2-d, 3-d and 4-d rainfall totals had associated return periods ranging only from 2.4 to 4.3 yr. The poor performance of the irrigation systems studied can be traced to their design shortcomings and undesirable design features. The potentials for improvements in hydraulic structures were evident. Key Words: canal irrigation, design criteria, design shortcomings, Ilocos Norte, systems rehabilitation Abbreviations: AFMA – Agriculture and Fisheries Modernization Act, CIS – communal irrigation system, NIS –national irrigation system, PIS – pump irrigation system, RIS – river irrigation system, ROTR – run-of-the-river, SWIP – small water impounding project
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Citations
Modernisation strategy for National Irrigation Systems in the Philippines : Balanac and Sta. Maria River Irrigation Systems
Mona Liza Fortunado Delos Reyes
- 12 Jul 2017
TL;DR: In this article, the authors examined the nature and impact of rehabilitation on increasing the actual area irrigated by the publicly funded canal irrigation systems of the Philippines and proposed a system diagnosis approach for the development of a more appropriate and climate-smart irrigation modernisation plan.
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Agricultural Water Management Issues in the Philippines
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Technical assessment of communal irrigation systems in Luzon
Roger A. Luyun
- 01 Jan 2015
TL;DR: Luyun et al. as mentioned in this paper presented a comprehensive review of the PIDS Policy Notes, which are observations/analyses written by PIDS researchers on certain policy issues, aiming to provide useful inputs for decision-making.
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•Posted Content
Assessing the Resurgent Irrigation Development Program of the Philippines – National Irrigation Systems Component
Roberto S. Clemente,Arthur L. Fajardo,Jr. Vicente G. Ballaran,Julie Carl P. Ureta,Arman Baulita,Kristel Camille J. Tapire +5 more
TL;DR: In this paper, the authors focused on the evaluation of National Irrigation Systems (NIS) in the Philippines which consisted of 22 NIS in Luzon and 17NIS in Visayas and Mindanao and represented by 151 Irrigators Associations (IAs).
Assessment of the process, nature and impact of rehabilitation for development of a moderniZation strategy for national irrigation systems in the Philippines
Mona Liza F. Delos Reyes,Mona Liza F. Delos Reyes,Wilfredo P. David,Bart Schultz,Krishna Prasad +4 more
TL;DR: The findings show that the rehabilitation works generally focused on maintaining the original canals, and canal lining was the most common improvement work.