What Is the Evidence Supporting the Technology Selection for Low-Volume
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© Photo by John Zada of [Insert photo attribution] Canada, Flick user Afghanistan Matters WHAT IS THE EVIDENCE SUPPORTING THE TECHNOLOGY SELECTION FOR LOW-VOLUME, RURAL ROADS IN LOW-INCOME COUNTRIES AND WHAT EVIDENCE IS THERE TO SUPPORT THE SUSTAINABILITY OF DIFFERENT RURAL ROAD TECHNOLOGIES? A SYSTEMATIC REVIEW, JULY 2016 The authors of this report are: Dr Michael Burrow (University of Birmingham) Mr Robert Petts (Intech Associates) Professor Martin Snaith (University of Birmingham) Dr Gurmel Ghataora (University of Birmingham Dr Harry Evdorides (University of Birmingham) Funding This is an independent report commissioned and funded by the Research and Evidence Division in the Department for International Development. This material has been funded by UK aid from the UK Government, however, the views expressed do not necessarily reflect the UK Government’s official policies. Acknowledgments The authors are very grateful to a team from the EPPI-Centre, overseen by Professor Sandy Oliver, for their assistance throughout the review process. In particular they are extremely grateful for the continual guidance and invaluable comment provided by Ms Kelly Dickson throughout the review stage and in helping to draft this report. The patient assistance of Mr Jeff Brunton in helping the review team to make best use of the EPPI-Reviewer software is also gratefully acknowledged. The review team are also grateful for the guidance and advice provided by the project’s Advisory Group. The three researchers who assisted greatly with the searching process, namely Mehran Eskandari Torbaghan, Danielle Fintleman and Fiona Raje, are thanked for their patience and thorough endeavours. We would also like to thank the peer reviewers for their input. The systematic review has been funded by the DFID. The advice provided by DFID’s Ms Liz Jones and Mr Suman Baidya in addressing the research question is also noted with gratitude. Finally, the review team would like to acknowledge the work of the authors of studies included in this review and those who participated in them, without which the review would have had no data. Conflicts of interest Where a paper written or co-authored by a member of the Review Team was considered for or included in the review, the author was not involved in decisions relating to its selection or quality assessment. Contributions The opinions expressed in this publication are not necessarily those of the EPPI-Centre/3IE or the funders. Responsibility for the views expressed remains solely with the authors. i Citation This report should be cited as: Burrow MPN, Petts RC, Snaith MS, Ghataora GS, Evdorides H (2016). What is the evidence supporting the technology selection for low-volume, rural roads in low-income countries and what evidence is there to support the sustainability of different rural road technologies? A systematic review. London: EPPI-Centre, Social Science Research Unit, UCL Institute of Education, University College London. Picture © Photo by John Zada of Canada, Flick user Afghanistan Matters © Copyright Authors of the systematic reviews on the EPPI-Centre website (http://eppi.ioe.ac.uk/) hold the copyright for the text of their reviews. The EPPI-Centre owns the copyright for all material on the website it has developed, including the contents of the databases, manuals, and keywording and data-extraction systems. The centre and authors give permission for users of the site to display and print the contents of the site for their own non-commercial use, providing that the materials are not modified, copyright and other proprietary notices contained in the materials are retained, and the source of the material is cited clearly following the citation details provided. Otherwise users are not permitted to duplicate, reproduce, re-publish, distribute, or store material from this website without express written permission. ii Executive summary SUMMARY INTRODUCTION This systematic review sought to identify technologies appropriate for low-volume rural roads (LVRR) which enable improved and sustainable low-volume rural access in low-and-lower middle- income countries (LLMICs). It is funded by DFID and conducted by the University of Birmingham. The hypothesis is that, if technologies can be found which have enabled the provision of LVRR infrastructure sustainably, the resulting improved access for rural communities will: (i) reduce poverty by facilitating economic activity; (ii) reduce the costs associated with transporting goods to and from internal and export markets; and (iii) increase social wellbeing by providing access to a variety of facilities and services. To this end this review addresses the following questions: 1. What is the evidence supporting the use of technology in low-income countries? 2. What is the evidence on which of these technologies have proved to be sustainable? This brief is designed to provide an overview of the key evidence identified in the systematic review and to assist policy makers and researchers in assessing that evidence. As the evidence is deeply contextual and this brief provides an overview, it is not designed to provide advice on which interventions are more or less appropriate in any given particular context. SUMMARY CONCLUSIONS This systematic review has identified a sound evidence base that engineering-based technologies can be used to improve the functional and structural performance of earth or gravel rural roads in LLMCs. Studies measured sustainability in terms of the performance of technologies (see Table 1). These technologies may be considered to be sustainable in physical terms in specific environments. Earth and gravel roads may also be considered to be sustainable in particular environments. Claims that these technologies are financially, operationally, environmentally or socially sustainable cannot be made strictly from the evidence of this review alone. However, the evidence from the review suggests that well-designed roads using available resources, under good construction supervision and subject to appropriate maintenance practice, will yield a sustainable road from a wide variety of materials in a wide variety of environments. The selection of a sustainable technology also needs to take into consideration the geo-socio- political environments in which the technology is implemented. This includes considering the sustainability needs of roads managed and financed by: (i) District councils: where there is an acute shortage of qualified technical staff; design, supervision, and the provision of regular maintenance funds is problematic. Sustainable LVRR technology should be: simple and easy to implement with little supervision; robust enough to remain serviceable without regular routine and periodic maintenance; What is the evidence supporting the technology selection for low-volume, rural roads in low-income countries? 1 Executive summary inexpensive and use locally available materials; capable of having routine maintenance carried out by local villagers with minimal training. (i) Central government roads department: these organisations typically employ technically qualified staff or use private-sector contractors, have reasonable but not always adequate or timely budgets. Sustainable technology in this context: could use cutting edge engineering technology; should not require close supervision of construction and maintenance; be robust enough to perform adequately under irregular maintenance. (ii) Contracted out management and maintenance of roads. In this case, funds typically come from a national road fund, but could also come through the ministry of local government. All road works are strictly audited. Sustainable technology can use cutting-edge engineering technology, because the work is properly designed, the contractor is effectively supervised and all work is subject to a detailed financial audit. Table 1: Trial technologies against some key markers Measure of sustainability s grade - sub Technology Local/marginal material Local/marginal based Labour construction of Simplicity Maintainability environs rainfall high in Suitability weak use on for Suitability suitability contractor Small advantages economy Local overloading axle to Resistance cost Initial advantage cost life whole Possible impact Environmental serviceability road Achieved SCORE AVERAGE Emulsion sand seals 1 1 1 3 4 3 1 2 3 1 3 2 2 2.1 Emulsion stone chip 3 1 2 2 2 3 1 2 3 2 2 2 2 2.1 seals Sealed dry-bound 3 3 2 1 2 2 2 3 2 2 2 3 2 2.2 macadam Sealed water-bound 3 3 2 1 2 3 2 3 2 2 2 3 2 2.3 macadam Hot bitumen stone 3 2 2 2 2 3 2 2 3 2 2 3 2 2.3 chip seals Surfaces Penetration macadam 3 3 2 2 2 3 2 2 3 2 2 4 2 2.5 Unsealed water- 2 2 2 4 4 3 2 3 3 1 4 3 4 2.8 bound macadam Otta seals 4 2 2 2 2 2 2 3 2 2 2 3 2 2.3 Sealed armoured 2 3 2 2 2 3 2 3 4 2 2 2 2 2.4 gravel What is the evidence supporting the technology selection for low-volume, rural roads in low-income countries? 2 Executive summary Measure of sustainability s grade - sub Technology Local/marginal material Local/marginal based Labour construction of Simplicity Maintainability environs rainfall high in Suitability weak use on for Suitability suitability contractor Small advantages economy Local overloading axle to Resistance cost Initial advantage cost life whole Possible impact Environmental serviceability road Achieved SCORE AVERAGE Dressed 1 1 2 2 1 1 1 1 1 3 2 1 4 1.6 stone/cobbles Fired clay bricks 1 1 2 2 3 1 1 1 2 2 2 2 3 1.8 Block Block surfaces Concrete bricks 2 1 2 2 3 1 1 2 1 3 2 1 2 1.8 Steel-reinforced 2 2 3 1 1 1 2 3 1 4 2 3 1 2.0 concrete Bamboo-reinforced 2 2 2 1 1 2 1 2 1 4 2 2 1 1.8 concrete surfaces Concrete Concrete Non-reinforced 2 2 2 1 1 2 1 2 1 4 2 2 1 1.8 concrete Lime stabilised 1 2 3 3 3 3 1 2 2 2 2 3 3 2.3 base/sub-base Cement stabilised 1 2 3 3 2 3 1 2 2 2 2 2 3 2.2 base/sub-base Bases Emulsion stabilised 1 4 4 2 2 3 4 3 2 3 2 4 3 2.8 sub-base Two-layer pavements 1 3 1 3 2 2 1 2 3 1 3 3 2 2.1 Unsealed natural 1 3 1 4 4 4 1 2 3 1 3 3 3 2.5 gravel Engineered earth 1 2 1 3 4 3 1 2 3 1 3 1 3 2.2 roads 1= advantages; 2=possible advantages; 3=neutral; 4 = disadvantages.