The presence of barrier islands along coasts determines a change of processes, where the areas of the marine sedimentation begin to receive sediments, which tend to be from continental origin. Thus, coastal lagoons begin to work like "receiver tunks" of the waters that drain adjacent coastal plain and ranges that delimit it drainage basin and consequently its hydro-sedimentological contribution area. The water like a connectivity element between natural systems, works carrying inputs and outputs of energy and matter between landscape systems, being an excellent indicator of the alterations in the diverse systems where it pass through.

The contributor drainage basins at Jacarepaguá Lagoon are in a growing state of degradation due to an inadequate land use. A product of this inadequate land use is the alteration of the amount and quality of the sediments, which arrive at the lagoon transported by fluvial channels, and which changes directly lagoonal sedimentation rates and consequently its morphology. This paper analyses solid and liquid discharges and the satellite image interpretation of five catchments with porposes of diagnostic some desequilibriums caused by crescent urban occupation of this area without a good urban infrastructure.