The document compiles the changes in the norm of the hydric resources, outlines suggestive reasonings and opinions that contribute to understand their effects. In this sense, it offers a rich material destined to illustrate and to enrich the comprehension and participation of the different sectors, both public and private, in a debate on a new Law of Waters orientated to search of solutions coordinated on the distribution, use and conservation of water, framed in the new approaches of the sustainable development and the regional process.