In Brazil

Are noticed diverse ambient problems in the areas with raised population densities, in regions especially urbanizadas, where courses d? water is modified, receiving sewers domestic ' ' in natura' ' , beyond sediments and garbage. This situation harms fragilizadas populations still more already that not having option of a housing in more appropriate place, if they lodge in places that do not count on basic sanitation and finish for pouring its garbage all, sewer, etc, in the courses d' water next, beyond suffering with material that already comes in the course d' water due to the ousting of industrial sewer in regions to the sum. Consequently, the urban aquatic ecosystems come losing its natural characteristics and its biological diversity (Schepp & Cummins, 1997 apud). In Brazil it has a great problem of lack of basic sanitation, the great majority of the sewers is launched directly in bodies d? water without previous treatment. Beyond of this, the politics of ambient sanitation adopted by the majority of the cities is to canalize and/or to rectify the rivers and streams. This form of urbanization adopted throughout the Brazilian hidrogrficas basins comes causing many ambient problems. These problems also bring consequences to the man, as alterations in regimes hidrolgicos, increase of illnesses of hdrica propagation, chemical contamination, erosion and assoreamento hindering the navigation in bodies d? water, beyond effect of bioacumulao and biomagnificao of metals heavy (Pompeu et al., 2004). The hdricos resources are affected by the lack of control of the use and occupation of the ground of the micron-basin. According to Alexander Schiavetti and Antonio Camargo (2005), they affirm that ' ' the characteristics of body d? water reflects the characteristics of its basin of draining, that being of great importance, for the evaluation of you analyze ambient in the terrestrial and aquatic ecosystems that if interact in one delicate equilbrio' '.