Mathematical models 2 Benchmarking (Management) 1 By-products 1 Desarrollo económico 1 Disinfection 1 Drought relief 1 Droughts 1 espandi ... Economic aspects 1 Economic development 1 Environmental permits 1 International economic relations 1 Maintenance and repair 1 Management 1 Management information systems 1 Microbial contamination 1 Modelos matemáticos 1 Municipal water supply 1 Planning 1 Prices 1 Privatization 1 Purification 1 Rates 1 Regional planning 1 Relaciones económicas internacionales 1 Sanitary engineering 1 Security measures 1 Water 1 Water consumption 1 Water resources development 1 Water transfer 1 riduci ...