Planned development, distribution and use of water resources, in accordance with predetermined objectives and with respect to both quantity and quality of the water resources.; The study, planning, monitoring, and application of quantitative and qualitative control and development techniques for long-term, multiple use of water resources under defined water polices and regulations.; It is the specific control of all human intervention on surface and subterranean water. Every planning activity that has something to do with water can be looked upon as water management in the broadest sense of the term.; One of the branches of national economy dealing with integration of all the activities aimed at a systematic control of the interrelation between water and society, with the main purpose of decreasing damages caused by water on the one hand and exploiting it on the other hand in a technically and economically optimal way.