Human activity and natural sources are reducing available water.
Effecting urbanization, population growth, increased living standards, competition for water, and pollution.
movement of large numbers of people from the countryside to towns and cities,
demands for greater food security and higher living standards,
increased competition between different uses of water resources, and
pollution from factories, cities, and farmlands.
Climate change and natural variability in the distribution and occurrence of water further complicate the sustainable development of our water resources.