LARGE SCALE IRRIGATION
REHABILITATION AND MAINTENANCE
Preliminary guidelines for the preparation of an asset management plan for irrigation infrastructure

Output summary
Full document

Procedures for the development of an Asset management plan for irrigation are described. Each of the steps is supported with background information, recommendations and examples or illustrations from the field trials.
IIDS, 1995. Asset management procedures for irrigation schemes - preliminary guidelines for the preparation of an asset management plan for irrigation infrastructure. Institute of Irrigation and Development Studies, University of Southampton, UK. 57pp
Management of weeds in irrigation and drainage channels
Output summary
Full document
A set of guidelines covering a selection of appropriate maintenance practices for different situations. The recomendations for each control method include detailed procedures, typical outputs, resources needed (equipment and personnel, training, backup facilities, capital and operating costs) and potential hazards.
Smout, IK; Wade, PM; Barker, PJ and Ferguson, CM, 1997. Management of weeds in irrigation and drainage channels. WEDC Report. ISBN Paperback 0 906055 57 1. 193pp.
A procedure for planning irrigation scheme rehabilitation
Output summary
Full document

A three-part procedure supports the appraisal of schemes for rehabilitation. A checklist of potential technical and non-technical constraints to performance and a farmer questionnaire provide guidance in identifying factors leading to poor system performance. Condition assessment procedures are also included to improve objectivity in assessing physical assets. Elements of the procedure can also be used to identify maintenance priorities.
Cornish, G. and Skutsch, J, 1997. A procedure for planning irrigation scheme rehabilitation. (Supporting software is optional). HR Wallingford, UK, Report no. OD/TN84. 32pp.

Maintaining the value of irrigation and drainage projects
Output summary
Full document
Lack of proper maintenance shortens the lifetime of infrastructure and nullifies assumptions about economic viability. Based on two projects in Asia the report presents economic analysis that shows that, in the medium to long term, adequate maintenance has significantly greater benefit for farmers and nations than the common practice of "neglect - rehabilitate - neglect".
Skutsch, J, 1998. Maintaining the value of irrigation and drainage projects. HR Wallingford, UK. Report no. OD/TN 90. 32pp.
Aids to maintenance: Guidelines for monitoring system condition
Output summary
Full document
Reviews maintenance planning procedures in the irrigation sector with examples from Sri Lanka and Mexico. The report then presents a procedure developed to help identify and prioritise maintenance needs on irrigation schemes in the developing world.
Cornish, G. 1998. Improved irrigation system planning and management: Aids to maintenance, incorporating guidelines for monitoring system condition. (Supporting software is optional). HR Wallingford, UK. Report no. OD/TN 94. 29pp.
Sustainable irrigation turnover: Guidelines for irrigation system maintenance
Full document - Part 1
Full document - Part 2
"Part 1: Branch canals" of the guidelines give branch canal Water User Association (WUA) members practical guidance on how to identify, prioritise, plan and implement maintenance to ensure the sustainable operation of their irrigation system.
"Part 2: Main canals" give central WUA members practical guidance on how main canal maintenance should be carried out on systems under joint management with Department of Irrigation, to ensure their sustainable operation.

HR Wallingford 2003. Sustainable irrigation turnover: Guidelines for irrigation system maintenance. HR Wallingford, UK. Part 1, 78pp. Part 2, 66pp.
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System Management

Guidelines for irrigation canal control
Vol 1: User manual
Vol 2: The guidelines

Output summary
Full document - Vol 1
Full document - Vol 2

The guidelines describe the principal causes of water wastage and inefficient water use, and suggest measures which can be adopted to reduce such wastage and improve performance through better management, operation, and canal control. For scheme managers, the Guidelines provide a ready reference, with worked examples of typical operation scenarios enhancing performance through more efficient use of the existing control structures and/ or improved procedures.
Halcrow Group Ltd., 1998. Guidelines for irrigation canal control: Volumes 1 and 2. Halcrow Group Ltd., Swindon, UK. Vol 1, 132pp. Vol 2, 33pp.

Measurement for irrigation water management

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Optimal allocation of irrigation water supplies

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Sustainable irrigation turnover: Report on system infrastructure
Full document The report aims to identify issues which affect how irrigation schemes are maintained after turnover from government to farmers. It describes findings from a literature review and fieldwork conducted on four irrigation schemes in Nepal, as well as from working visits to schemes in Gujarat, India.
Anon 2001. Sustainable irrigation turnover: Report on system infrastructure. HR Wallingford, UK, Report no. OD/TN 110. 63pp.
Water charging in irrigated agriculture: Lessons from the literature
Full document This document presents an overview of experiences in irrigation water charging, as reported in the literature. It will be of value to policy makers and researchers who formulate or advise on irrigation policy.
Bosworth, B; Cornish, G; Perry, C and van Steenbergen, F. 2002. Water charging in irrigated agriculture: Lessons from the literature. HR Wallingford, UK, Report no. OD 145. 58pp.
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Sediment Control
The feasibility of flushing sediment from reservoirs
Output summary
Full document
Methods to assess the feasibility of flushing sediment from reservoirs using simple criteria and readily available data are described. The report describes the processes involved in reservoir flushing and methods to predict the volume of sediment removed and the percentage of original storage capacity maintained by periodic flushing.
Atkinson, E, 1996. The feasibility of flushing sediment from reservoirs. HR Wallingford, UK. Report no. OD 137. pp21.
Evaluating the economic benefit of sediment control in irrigation systems
Output summary
Full document
The cost of removing sediment can be greatly reduced if sediment control structures are used to limit the concentration of sediment entering canal networks. The report describes how to determine the economic benefits of introducing sediment control structures at schemes where desilting costs are unacceptably large, or where sedimentation reduces the areas that can be reliably irrigated. An application of the procedure on an irrigation system in the Philippines is described. The information is aimed at system designers and technical planners.
Chancellor, F; Lawrence, P and Atkinson, E, 1996. A method for evaluating the economic benefit of sediment control in irrigation systems. HR Wallingford, UK. Report no. OD/TN 81. 18pp.
A numerical model for predicting sediment exclusion at intakes
Output summary
Full document
The PHOENICS 3D modelling software was used to model the performance of sediment exclusion structures at river off-takes. Validation using field data demonstrates that the technique has great potential to improve intake design by accurately predicting the degree of sediment exclusion provided. The report is aimed at design engineers familiar with computational fluid dynamics.
Atkinson, E, 1995. A numerical model for predicting sediment exclusion at intakes HR Wallingford, UK, Report no. OD 130. 22pp.

Sediment control slide pack

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Sediment monitoring slide pack

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Sediment discharge measurement video

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RESSASS software

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SHARC software

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Drainage and Salinity
Soil salinity processes under drainwater reuse in the Nile Delta, Egypt
Output summary
Full document
Increasing demands on a limited water supply in the Nile Delta have necessitated the reuse of drainage water for irrigation. Processes of salt accumulation and movement in working farmers' fields have been studied in situ. The report presents the results of analysis on salt leaching and diffusion processes. The information can be used to develop and improve predictions of salinity build-up under drainwater reuse in other similar areas.
Abbott, CL and EL Quosy, DED, 1996. Soil Salinity Processes under Drainwater Reuse in the Nile Delta, Egypt. HR Wallingford, UK. Report no. OD 133. 20pp.
A procedure to assess the impacts of drainwater reuse
Output summary
Full document
This management tool has been developed to aid selection of appropriate strategies andmanage ment methods for drainwater reuse in irrigated agricultural areas. It comprises an Assessment Procedure for likely impacts and for making best planning and management decisions so that agricultural production is sustainable and maximised, and negative impacts on soils, crops and the environment are minimised. The report is intended for non-specialist water resource planners and managers.
Abbott, CL and EL Quosy, DED, 1996. A procedure to assess the impacts of drainwater reuse. HR Wallingford, UK. Report no. OD 134. 75pp.
Reclamation of saline clay soils:
A manual for the horizontal leaching technique
Output summary
Full document
The horizontal leaching technique has been developed for the reclamation of salinised, heavy clay soils. It enables excess salt to be removed from clay soils that are deep enough (deeper than 1m) and have low permeability (less than 0.1m/day). Such soils are commonly found in irrigated plains in arid and semi-arid countries. This manual provides sufficient technical information to enable implementation where suitable.
Armstrong, ASB; Hughes, EJ; Rycroft, DW; Tanton, TW; Pearce, GR and Abbott, CL, 1996. Reclamation of saline clay soils - A manual for the Horizontal Leaching Technique. University of Southampton, UK, in association with HR Wallingford, UK. ISBN: 1 898485 03 8. 65pp.
Research priorities for agricultural drainage in developing countries
Output summary
Full document
Six priority areas for drainage research considered to be of primary importance to improving long-term agricultural output in the developing world are identified. These are reviewed and priority research topics highlighted in each area.
Abbott, CL and Leeds-Harrison, PB, 1998. Research priorities for agricultural drainage in developing countries. HR Wallingford, UK. Report no. OD/TN92. 17pp.

WASIM software

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