Comparative performance assessment of major irrigation systems in Upper Deduru Oya Basin

Lakmali, W.A.S.; Gunawardena, E. R. N.; Dayawansa, N. D. K.

doi:10.4038/tar.v26i2.8097

Cited by 6 publications

(4 citation statements)

References 5 publications

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“…Notwithstanding the rising trend, there is a lot of variation between the years, the lowest value being 0.85 and 0.94 kgm -3 as the highest value. The value of OPIS was found to range from 8.80-28.78 kgm -3 for rice in Sri Lanka (Lakmali et al, 2015). According to De Fraiture and Garces-Restrepo (1997), a closer analysis of irrigation and rainfall showed that if rainfall is higher than irrigation needed, the value of OPIS is high but less in the dry season.…”

Section: Output Per Unit Irrigation Supply (Opis)mentioning

confidence: 98%

Assessing the performance of an irrigation scheme in Okyereko, Ghana

Alordzinu¹,

Sam-amoah²,

Owusu-Sekyere³

2017

J. Agric. Ext. Rural Dev

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Assessing the performance of an irrigation scheme is an important management function which will indicate the state of the scheme and suggest possible remedial measures to improve the effectiveness of the scheme. This study was conducted to assess the technical and agricultural performances of the Okyereko irrigation scheme in the Central Region of Ghana. Secondary data were collected from the scheme with respect to rainfall, yield for the period of 2011 to 2015 seasons whilst field measurements were carried out to determine the water supply and demand. This study assessed three technical performance indicators and two agricultural performance indicators during the 2014/2015 season. The V-notch and the rectangular weir were used to measure the water delivery and the Manning formula was used to calculate the flow-rates in canals. Water requirements were estimated using the modified Penman method. The results from this study indicated an overall scheme conveyance efficiency of 78.2%, a maximum dependability of irrigation intervals between water applications of 2 and a scheme relative irrigation supply of 1.38. The agricultural performance indicators, output per unit irrigation supply and water productivity per unit crop evapotranspiration (ET), were found to be 0.90 and 20.53 kgm-3 , respectively for rice. This study recommends that farmers should be actively involved in all performance assessments and scheme organizations in order to improve the performance since the farmers are major stakeholders of irrigation schemes and are responsible for operation and maintenance after the introduction of Participatory Irrigation Management.

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Section: Output Per Unit Irrigation Supply (Opis)mentioning

confidence: 98%

Assessing the performance of an irrigation scheme in Okyereko, Ghana

Alordzinu¹,

Sam-amoah²,

Owusu-Sekyere³

2017

J. Agric. Ext. Rural Dev

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“…Water as a critical input determines the crops yields and hence the livelihood of farmers in the Hakwatuna Oya irrigation scheme. It was found by other researchers that 78% of the farmers have no other income source except crop production in the Hakwatuna Oya irrigation scheme (Lakmali, 2015). Therefore, farmers are ready to fight and steal water as long as they have access to water.…”

Section: Water Conflicts In Hakwatuna Oya Irrigation Schemementioning

confidence: 99%

Water conflicts among different water users and uses in the <em>Hakwatuna Oya</em> watershed in the <em>Deduru Oya</em> basin, Sri Lanka

2016

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Scarcity of water is the main problem of agriculture and other livelihoods of Hakwatuna Oya watershed in Deduru Oya basin which leads to conflicts among different water users and uses. With this background, a study was conducted to find water conflicts and factors leading to such conflicts among different water users and uses in Hakwatuna Oya watershed. Various field research methodologies including field surveys, focus group discussions, and interviews with farmers, officials and community leaders were used to gather information. In addition, documentary evidence, such as minutes of the monthly Project Management Committee meetings during 2012 Maha to 2014 Yala seasons were perused to study the conflicts within the irrigation command. Conflicts between head-end and tail-end farmers, farmers and officers, farmers of irrigation command area and in the catchment, farmers of irrigation command area and fisherman and farmers of irrigation command and outside of the command area were found during the study. Conflicts arise mainly due to water scarcity, and number of conflicts is comparatively higher during Yala (dry) season. Illegal water tapping is the most common reason for conflicts among farmers. Poor attitudes of farmers, weakness of existing land and water rights, non-implementation of existing law primarily due to political interference, encroachments and inadequate institutional arrangement for water resource management are found to be contributing factors to water conflicts. The socioeconomic and cultural factors, such as gender and religion also play roles in existing water conflicts.

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“…Irrigation water supply is considered the main factor from the point of view of irrigation system assessment. Hence, the irrigation system's water supply performance can be assessed, and field irrigation efficiency can be estimated [41]. An approach based on water balance was thus followed.…”

Section: Baseline Scenariomentioning

confidence: 99%

A Decision Support System for Water Resources Management: The Case Study of Mubuku Irrigation Scheme, Uganda

2019

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The greater competing demand for water requires an efficient use of water resources. Therefore, an optimum management is necessary in order to deal with the constraining factors. In African countries, irrigated agriculture is the largest user of surface water resources. Nevertheless, recent assessments in small-scale surface irrigation schemes resulted in poor performance indicators: Water use efficiency indicators of existing schemes are below 50 percent, owing to inadequate management modes. The paper sheds the light on the potential development of a decision-support system based knowledge with the Mapping System and Services for Canal Operation Techniques approach, merged with the MIKEHydro Basin model as a versatile and flexible framework conceived for a large variety of applications in small-scale irrigation. The model aims to improve water service, increase irrigation efficiency, comply with socio-economic objectives at country level. In order to address the prevailing heterogeneity of small-scale irrigation scheme, numerous variables are adjusted in the model, in terms of cropping patterns, climate data, and irrigation time. The evaluation of established water balance under different scenarios showed that tackling supply-driven scheduling and distributive issues significantly increases efficiency. Nevertheless, water allocation according to socio-economic objectives of food security and market security implies trading off the efficiency objectives.

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Comparative performance assessment of major irrigation systems in Upper Deduru Oya Basin

Cited by 6 publications

References 5 publications

Assessing the performance of an irrigation scheme in Okyereko, Ghana

Assessing the performance of an irrigation scheme in Okyereko, Ghana

Water conflicts among different water users and uses in the <em>Hakwatuna Oya</em> watershed in the <em>Deduru Oya</em> basin, Sri Lanka

A Decision Support System for Water Resources Management: The Case Study of Mubuku Irrigation Scheme, Uganda

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