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third the distance of the floodplain, so a stream that floods to 900 feet should have a buffer of 300 feet.
Point pollution, something coming out of a pipe for instance, is actually far less than all other pollution. It accounts for three percent of the polluting nitrogen and 10 percent of the polluting phosphorus above the fall line.
Non-point pollution above the fall line accounts for 97 percent of the polluting nitrogen and 90 percent of the polluting phosphorus.
Non-point pollution is broken down by source: agricultural crops contribute 56 percent af the polluting nitrogen and 54 percent of the polluting phosphorus; pasture contributes 27 percent of the polluting nitrogen and 27 percent of the polluting phosphorus; urban runoff contributes six percent af both pollutants; septic systems contribute four percent of the polluting nitrogen and no measureable amount of phosphorus, and animals (such as feed lots) contribute five percent and three percent respectively.
95.8%