Currently, we are developing a sediment management plan for the Federal District of Brasília that aims at the reduction of sediment input into water reservoirs. A central element of this approach is a planning support tool - letsmap do Brazil - that enables the user to test the effects of land use changes on landscape processes and functions (LPF), such as runoff control, sediment input in river network, nitrogen export, and agronomic value. The tool has two principal levels. The upper level contains information on effects of land use on LPF. The parameterized relation between land use and LPF is the core of the system. For each LPF a value specific to land use has been assigned. Values for LPF´s were taken from published research, e.g. C factor from USLE (sediment generation), curve number (water retention), or statistics (agronomic yield). On this level users are allowed to act as land use planer/manager. By changing land uses classes the effect on LPF´s might be tested. The second level contains information on landscape properties and potentials (LPP´s), e.g. potential of runoff control or potential of sediment retention. By linking land use specific values and information on LPP a spatially explicit assessment of effects of land use change on LPF will be achieved.