Planning also needs to consider the needs of schools, health facilities and other institutions. Water in the atmosphere plays a major role in maintaining a habitable environment for human life. Clearly there is some overlap between these major scientific disciplines; both hydrologists and meteorologists, for example, have contributed to the study of water movement in the lower boundary layers of the atmosphere.
Adding to the problem is the increasing evidence that chemical wastes improperly discarded yesterday are showing up in our water supplies today. In distribution networks, the drinking water temperature and water residence time are regarded as indicators of the drinking water quality.
It may flow to rivers and finally to the sea. These conditions may endure from generation to generation. This instrument, which specifies recommended voluntary actions, identifies common issues to be included in water resources legislation and management, mechanisms of cooperation on "new and additional water resources," and proposed areas for possible cooperation.
As Edith Brown Weiss has observed, "sustainable development is inherently intergenerational because it implies that we must use our environment in a way that is compatible with maintaining it for future generations.
Other practices include lining the bottom of a landfill with watertight materials, collecting any leachate with drains, and keeping the landfill surface covered as much as possible.
Other methods include solute sampling and geophysical methods. The need for intergenerational equity is particularly acute in the Middle East, where freshwater supplies are scarce, their use intensive, the claimants to them many, and the potential for depriving future generations of adequate freshwater supplies, at least at comparable prices, quite real.