Impactos ambientais da ocupação urbana do igarapé Tucunduba

This paper presents an assessment of the environme ntal degradation of the stream Tucunduba in Belem do Para. The basin is situated in an area of accelerated process of urbanization and is now occu pied by low-income population and lacks infrastructure serv ices. The Tucunduba stream is located southeast of the city of Belem and has 3900 m of extension and its basis has about 1055 ha in area and it is a tributary of the large rio Guama. The analysis of ortho-rectified aerial photo s obtained in 1972, 1977 and 1998 and of a SPOT satellite imagery obtained in 2006 using computational tools of ArcMap and ArcGIS packages it was possible to produce maps showing the accelerated urbanization in the re gion around the stream and as a consequence the dec rease in green area. Based on field check, it was possible t o verify the major environmental impacts caused by inappropriate human occupation of this area, confir ming poor sanitation conditions and the disposal of waste directly in the water body without any treatment.