The Rehabilitation of the Delta of the Senegal River in Mauritania
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IUCN Wetlands and Water Resources Programme BLUE SERIES The rehabilitation of the delta Senegal River in Mauritania The rehabilitation of the delta of the Senegal River in Mauritania IUCN – The World Conservation Union Fielding the ecosystem approach Founded in 1948, The World Conservation Union brings together States, government agencies and a diverse range of non-governmental Olivier Hamerlynck & Stéphanie Duvail organizations in a unique world partnership: over 1000 members in all, IUCN Mauritania spread across some 140 countries. As a Union, IUCN seeks to influence, encourage and assist societies throughout the world to conserve the integrity and diversity of nature and to ensure that any use of natural resources is equitable and ecologically sustainable. The World Conservation Union builds on the stengths of its members, networks and partners to enhance their capacity and to support global alliances to safeguard natural resources at local, regional and global levels. IUCN Wetlands & Water Resources IUCN Publications Services Unit Programme 219c Huntingdon Road Rue Mauverney 28 Cambridge, CB3 0DL, CH-1196 Gland, Switzerland United Kingdom Tel:+41 22 999 0000 Tel:++44 (1223) 277-894 Fax:+41 22 999 0002 Fax:++44 (1223) 277-175 E-mail: [email protected] E-mail: [email protected] www.iucn.org/themes/wetlands/ www.iucn.org/bookstore/ IUCN The World Conservation Union The World Conservation Union The rehabilitation of the delta of the Senegal River in Mauritania Fielding the ecosystem approach Olivier Hamerlynck & Stéphanie Duvail The Diawling National Park Restoration Programme initiated in 1989 is a joint venture between the Ministry of Environment of Mauritania and UICN - The World Conservation Union, mainly with support from the Netherlands Ministry for Development Cooperation (DGIS) and the French Global Environment Facility (FFEM). The designation of geographical entities in this book, and the presentation of the material, do not imply the expression of any opinion whatsoever on the part of IUCN concerning the legal status of any country, territory, or area, or of its authorities, or concerning the delimitation of its frontiers or boundaries. The views expressed in this publication do not necessarily reflect those of IUCN. This publication has been made possible in part by funding from the Government of the Netherlands Published by: IUCN, Gland, Switzerland and Cambridge, UK Copyright: ©2003 International Union for Conservation of Nature and Natural Resources Reproduction of this publication for educational or other non- commercial purposes is authorized without prior written permission from the copyright holder provided the source is fully acknowledged. Reproduction of this publication for resale or other commercial purposes is prohibited without prior written permission of the copyright holder. Citation: Hamerlynck, O. and Duvail, S. (2003). The rehabilitation of the Delta of the Senegal River in Mauritania. IUCN, Gland, Switzerland and Cambridge, UK. viii + 88 pp. ISBN: 2-8317-0751-X Design by: PSU and Elroy Bos Editing: Starr Pirot Cover photograph: “At long last, the water is back”: a tense moment for Diawling National Park staff as they observe the first trial dry season managed flood release through Lemer sluice-gate - 9 April, 1997. See also Box 3, page 29. Printed by: Sadag Imprimerie - 01200 Bellegarde, France Available from: IUCN Publications Services Unit 219c Huntingdon Road, Cambridge CB3 0DL, United Kingdom Tel.: +44 1223 277894, Fax:+44 1223 277175 E-mail: [email protected] http://www.iucn.org/bookstore A catalogue of IUCN publications is also available The text of this book is printed on couché mat 115g, chlorine-free paper. Dedicated to the memory of Adrian Adams who, until that tragic day in September 2000, was the eloquent voice of the farmers and fisherfolk of the central Senegal River valley. Readers are encouraged to savour her moral testament entitled “Social impacts of an African dam: equity and distributional issues in the Senegal River Valley”,which covers much more than the title suggests (download from www.dams.org). Perpetuating and optimising managed flood releases from Manantali and Diama dams to annually flood the largest area of floodplain possible in support of the flood-dependent livelihoods and ecosystems of the valley would be a wonderful tribute to her life’s work. The dams on the Senegal River are an incontrovertible reality. The challenge lies in improving their management so as to minimise the negative impacts on the environment and allow a wider range of stakeholders to benefit from them. True integrated management might prove Adrian Adam’s pessimistic pre-dam statement wrong (quote as translated by the author): “Developing the resources of the Senegal River is an essential task for river people and for the riverine countries as a whole. However, were it to be done according to current plans, it would be better for them that it not be done at all”. Adrian Adams 1977. Le long voyage des gens du Fleuve. Maspéro, Paris. Table of Contents Acknowledgements ........................................................................................ viii Foreword........................................................................................................... ix 1. Introduction ................................................................................................ 1 2. Background................................................................................................. 3 2.1. From marine bay to (pseudo) delta...................................................... 3 2.2. A recently settled “no-man’s land”..................................................... 4 2.3. Three weeks of green and a dam ......................................................... 5 3. The story.................................................................................................... 11 3.1. A National Park on paper................................................................... 11 3.2. The management plan ........................................................................ 13 3.3. Gaining local credibility .................................................................... 15 3.3.1. Onions and tomatoes................................................................ 15 3.3.2. Upstream-downstream hydraulics ........................................... 18 3.3.3. Conflict and compromise......................................................... 19 4. Toward a consensus.................................................................................. 23 4.1. Hydraulic modelling .......................................................................... 23 4.2. Predicting resource response to managed flood releases................... 25 4.3. Conflicting water needs ..................................................................... 27 4.4. External constraints............................................................................ 29 4.5. A consensus scenario ......................................................................... 30 5. The first results......................................................................................... 33 5.1. More of everything............................................................................. 33 5.2. Turning the tide: the artificial estuary................................................ 38 5.3. On the (drinking) water front............................................................. 39 6. Analysis...................................................................................................... 47 6.1. Achievements ..................................................................................... 47 6.2. Outstanding issues.............................................................................. 49 6.3. Threats................................................................................................ 52 7. Ecosystem management........................................................................... 55 7.1. The 12 principles................................................................................ 56 8. Lessons learned......................................................................................... 65 9. Opportunities............................................................................................ 69 9.1. A managed flood release laboratory .................................................. 69 9.2. A transboundary Biosphere Reserve.................................................. 69 9.3. An environmental code of conduct on water management for OMVS 70 Bibliography................................................................................................... 71 Appendices ..................................................................................................... 74 Appendix 1 ..................................................................................................... 74 Appendix 2 ..................................................................................................... 82 Acknowledgements Core funding for the project was provided mainly by the Ministry of Development Cooperation of the Netherlands, through the IUCN Wetlands and Water Resources Programme, and by the French Global Environment Facility (FFEM). Additional support received by the Diawling National Park includes grants from the Govern- ment of Catalonia, the International Foundation for the Banc d’Arguin and the Convention on Wetlands (Ramsar, Iran, 1971). The Government and the people