A multiobjective model was developed first, to integrate, within a single framework, the conflicting interests of maintaining environmental quality, satisfying growth, and maximizing a developer's return; and second, to provide urban planners and environmentalists with the capacity to weigh the tradeoffs involved in policy¬making in environmentally sensitive areas. The model was used to quantify tradeoff between stormwater runoff, flooding and housing return using an environmental simulation model to measure the environmental response to potential development; a Geographical Information System to determine the spatial extent of flooding over the topography; and an economic cost model to estimate land use development profitability or loss. Pair-wise comparison among objective pairs was used to generate three regression curves of the tradeoffs involved with various degrees of objective bias. The methodology used proves that the information learned through tradeoff analysis using objective pair-wise comparison is essential to decision-making. Various tradeoff curves indicate that a watershed experiences a range of sustainable and economically sound development solutions, rather than reach a single, static optimal point of development. The model finds that even when environmental concerns dominate decision-making, interests of private developers can still be maintained when an associated investment in runoff mitigation options is made. The allocation pattern of housing development in the study area indicates that some housing plans and layouts are more environmentally friendly than others. The system of runoff, flooding and return coefficients generation, and the tradeoff curves developed for the study area, can become the benchmark for a nationwide comparison with other urbanizing watersheds.