László Somlyódy

Kenneth M. Strzepek

Zdzislaw Kaczmarek

Valentina Priazhinskaya

This text is the first international and comprehensive discussion of the impacts of climatic fluctuations and climate change on water resources management. The book presents an overview of the impacts of climatic change/fluctuations on a wide variety of water resources sectors including river runoff, water quality, water temperature, water use and demand, reservoir management and water resource planning and management. The book is unique in that it then presents a series of case studies to both demonstrate the application of climate change impact assessment methodologies and to provide insights to catchment, river basin, and national scale impacts of climate change/fluctuations on the water resources of Africa, Europe, and North America. Audience: Researchers, scholars and students of hydrology and water management who are concerned with the issues of climate change as well as the climate change impact assessment community.

Water Resources Management in the Face of Climatic/Hydrologic Uncertainties

James E. Neumann

Raffaello Cervigni

Rikard Liden

To sustain Africa’s growth, and accelerate the eradication of extreme poverty, investment in infrastructure is fundamental. In 2010, the Africa Infrastructure Country Diagnostic found that to enable Africa to fill its infrastructure gap, some US$ 93 billion per year for the next decade will need to be invested. The Program for Infrastructure Development in Africa (PIDA), endorsed in 2012 by the continent’s Heads of State and Government, lays out an ambitious long-term plan for closing Africa’s infrastructure including trough step increases in hydroelectric power generation and water storage capacity. Much of this investment will support the construction of long-lived infrastructure (e.g. dams, power stations, irrigation canals), which may be vulnerable to changes in climatic patterns, the direction and magnitude of which remain significantly uncertain. Enhancing the Climate Resilience of Africa 's Infrastructure evaluates -using for the first time a single consistent methodology and the state-of-the-arte climate scenarios-, the impacts of climate change on hydro-power and irrigation expansion plans in Africa’s main rivers basins (Niger, Senegal, Volta, Congo, Nile, Zambezi, Orange); and outlines an approach to reduce climate risks through suitable adjustments to the planning and design process. The book finds that failure to integrate climate change in the planning and design of power and water infrastructure could entail, in scenarios of drying climate conditions, losses of hydropower revenues between 5% and 60% (depending on the basin); and increases in consumer expenditure for energy up to 3 times the corresponding baseline values. In in wet climate scenarios, business-as-usual infrastructure development could lead to foregone revenues in the range of 15% to 130% of the baseline, to the extent that the larger volume of precipitation is not used to expand the production of hydropower. Despite the large uncertainty on whether drier or wetter conditions will prevail in the future in Africa, the book finds that by modifying existing investment plans to explicitly handle the risk of large climate swings, can cut in half or more the cost that would accrue by building infrastructure on the basis of the climate of the past.

The Power and Water Sectors

Enhancing the Climate Resilience of Africa's Infrastructure

Alyssa McCluskey

This paper summarizes the methods and findings of the hydrological assessment component of the project studying likely impacts of climate change on water resources and agriculture in Africa. The first phase of the study used a version of a conceptual rainfall-runoff model called WatBal (Water Balance) applied to gridded data to simulate changes in soil moisture and runoff across the whole continent of Africa rather than to any particular catchment or water resource system. The model inputs were the climate variables of the 1961-90 climatology and physiological parameters (such as soil properties and land use) derived from global datasets for each of the 0.5 degree latitude/longitude cells across the continent. The primary model output comprised a time series (monthly time step) of simulated runoff for all the grid cells for each of the districts in the countries of interest. The second phase of the study extended the hydrology analyses to update the above hydroclimatic series to the year 2000 using updated input data. To ascertain the possible impacts of climate change within the districts being investigated this study used synthetic or GCM-based climate change scenarios as input to the WatBal model. The WatBal model was used to determine the impact of these different scenarios on runoff and actual evaporation and hence flow in the districts under study. The generated hydroclimatic series and scenario analyses were used as inputs into various Ricardian regressions in other analyses measuring likely impacts of climate change on the agricultural economies of Africa.

The Impacts of Climate Change on Regional Water Resources and Agriculture in Africa

R. L. Lenton

Theoretical and Practical Characteristics of the Mi River Basin Simulation Model

Kenneth M. Strzepek

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