Flow Accumulation

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Developed from the flow direction layer, the flow accumulation data set defines the number of cells which flow into each downslope cell. Since the cell size of the HYDRO1k data set is 1 km, the flow accumulation value translates directly in to upstream drainage areas in square kilometers. Values range from 0 at topographic highs to very large numbers (on the order of millions of square kilometers) at the mouths of large rivers.

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Download HYDRO1k Flow Accumulation data set for Africa as a tar file (28.5 MB)
Download entire HYDRO1k data set for Africa as a tar file (215.5 MB)

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U.S. Department of the Interior | U.S. Geological Survey URL: http://eros.usgs.gov/ Page Contact Information: custserv@usgs.gov Page Last Modified: August 22, 2006

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