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The Hadejia-Nguru Wetlands
The Hadejia-Nguru Wetlands-Environment, Economy and Sustainable
Development of a Sahelian Floodplain Wetland
G.E. Hollis, W.M. Adams & M. Aminu-Kano
This authoritative book, which represents a major expansion and
updating of a formative early report (Adams and Hollis, 1988), provides
facts, analyses and prognostications. Its presentation of the wetlands;
their people; their diversity and wealth of production; the essential
environmental services provided there; the threats to the system
and the downstream areas; and the options for future management
will both inform and stimulate debate. The book also details the
unsuccessful attempts to develop the region economically by controlling
water resources through dam construction and water diversion for
intensive irrigation schemes. In particular it describes the hydrological
model of the Hadejia-Jama' are-Yobe basin and indicates the implications
in terms of groundwater recharge and availability of water for agriculture
and wildlife of different management options, such as water release
from the reservoir.
244 pp. ISBN: 2-8317-0107-4, 1993. Price £10/US$20
Table of Contents
Foreward
Contributors
Acknowledgements
Abbreviations
The Hydrological Model
1. Introduction
Wetlands in Sub-Saharan Africa
Floodplain wetlands in West Africa
The Hadejia-Nguru Wetlands
Part I: Environment
2. The natural resources of the Hadejia-Nguru Wetlands
Soils and land systems
Vegetation
Wildlife
3. Hydrology of the river basin
Rainfall
Evaporation and evapotranspiration
Hadejia River
Jama’are River
The wetlands
River Yobe at Gashua
Analysis of data between stations
Groundwater
Yobe River and Lake Chad
4. Hydrological model of floodplain
Water balance - inundation area model
Conclusions
Part II: Economy
5. Economy of the floodplain
Economic importance
Population and economic activity
Integration of the wetland economy
Economic change
6. Agriculture, grazing and forestry
Agriculture
Irrigated cropping in the floodplain
Grazing
Tree cover
7. Fishing in the floodplain
Social aspects of the fishery
Fisheries licensing and regulations
Processing and marketing the catch
Economic value of the fishery
Future of the fishery
Part III: Conservation and development
8. Management of the river basin and irrigation
River basin planning in Nigeria
Basin planning in the Hadejia-Nguru wetlands
Formal irrigation schemes
Costs and benefits of large-scale irrigation
Indigenous irrigation
Fadama rehabilitation
Dredging the Keffin Hausa
9. Water resource developments and their hydrological impacts
The status of dams and irrigation schemes
Channel engineering
Inter-basin transfer
Use of the hydrological model
Scenarios studied
A regulated natural regime
Tiga Dam with capacity reduced to 1400 106m3
Outlet sluices on Kafin Zaki and artificial floods
Conclusions
10. Economic valuation of wetland benefits
Economic appraisal methodology
Economic valuation of the floodplain
Comparison with development projects
Other floodplain benefits
Conclusions
11. The wetlands and nature conservation
Existing reserves
Reserves, multiple use or ecodevelopment ?
12. Land use, water-management and conservation in the Komadugu-Yobe
basin
Farming systems and population
Flooding and farming systems
Water management and the lack of regional policy
The impending construction of Kafin Zaki Dam
Dry season flows
Artificially sustained flooding
Conservation
Alternatives
Discussion
Conclusion
13. Bibliography
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