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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 3 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.