Urban Service Chala Deyessa Fita

Water supply and sanitation service are the most important elements for the survival of human beings. On the other hand, the number of world population is exceedingly increasing from time to time particularly in the urban area because of natural population growth and different socioeconomic factors in the rural areas and small towns. This creates big challenges in the provision of urban services particularly water supply and sanitation service predominantly in developing countries Это и многое другое вы найдете в книге Urban Service (Chala Deyessa Fita)