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Add Up the Acres A big question about soil is how well it drains. Does water go through it too fast? Or does it absorb water and filter the water down into the ground? The NRCS soil survey found that the majority of soils in the Bronx River watershed were fairly well-draining. This means that rain in this soil will likely filter down into the ground and gradually discharge into the river from the ground-water system. But there's a hitch: How much rainwater has a chance to even reach soil in this watershed? How much soil is actually exposed to the rain-and capable of draining it underground--and how much is covered over by sidewalks, buildings and roads that will cause runoff? To answer this question, the NRCS surveyed the 6637-acre area of the Bronx River watershed in New York City to see how the land was being used. After sorting the acres into different types of use, here's what they found. 
The following map shows land use in a greater portion of the Bronx River watershed. Different types of natural and man-made landscapes are described in this analysis.
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