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RHUM90 - Percentage of stream corridor buffered to 90 meters classified as all human land use The percentage of human use land cover 90 meters adjacent to streams
is calculated by summing the total number of agricultural, urban
and non-natural barren (transitional and mines/quarries) land cover
cells underneath stream segments in the 1 km grid cell reporting
unit and within a three cell buffer (90 meters) and dividing by
the stream corridor’s total land area (all cells 90 meters
adjacent to streams minus those classified as water). Cells inside
the buffer zone but outside of the grid cell boundary are ignored.
This metric can be used to identify areas near streams which may
be more susceptible to non-point source pollution, pesticides, excess
fertilizer and soil erosion which may result in stream and lake
sedimentation or eutrophication. |