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RURB90 - Percentage of stream length within 90 meters of urban The percentage of urban land cover within 90 meters of a stream
is calculated by summing the total number of urban 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. High amounts
of urban land indicate substantial modification of natural vegetation
cover and may have profound effects on wildlife habitat, soil erosion
and water quality. The closer urban land is to a stream the more
likely it will have adverse affects on the stream habitat and water
quality. |