140 The Future of Water in African Cities
This appendix documents the methodology, data collection, validation, and representation of the diagnostic. A full list of indicators and a sample of data sources are provided in Appendix 3. City leaders and decision makers may also find Appendix 4, “Methodology for Urban Extent Maps,” to be of interest and of relevance in making informed planning and investment decisions in relation to water. For the 31 cities, Appendix 4 shows historical and possible future spatial extent up to 2025.
Methodology of Data Collection, Validation, and Representation The diagnostic was constructed through the following four steps: 1. Select cities to be included. 2. Select broad variables that are likely to have an impact on water management challenges. 3. Select indicators for each variable. In doing so, consider how the indicator represents the variable, data availability and quality, and process of data collection and validation. 4. Create tools for data representation.
Selection of Cities The 31 cities (see Table A2.1) were selected based on whether they fulfilled some or all of the following criteria: • population growth rate (more than 3 percent growth rate)1 • size (more than 2,000,000 inhabitants)2 • World Bank presence.