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RAGC30 - Percentage of stream corridor buffered to 30 meters classified as cropland The percentage of cropland cover within 30 meters of a stream is calculated by summing the total number of cropland land cover cells underneath stream segments in the 3 km grid cell reporting unit and within a one cell buffer (30 meters) and dividing by the stream corridor's total land area (all cells 30 meters adjacent to streams minus those classified as water). Cells inside the buffer zone but outside of the grid cell boundary are ignored. Agricultural practices typically employ fertilizers, pesticides and other chemicals that may be transported to streams in water runoff. The closer the agriculture is to a stream the more likely related pollutants will enter the stream. Concentrations of pollutants transported into streams are also more likely to be higher when agriculture is closer to streams. |