How much excess nitrogen – from fertilizers, animal waste, sewer lines, and highways – reaches waterways appears to be heavily influenced by the width of the vegetated borders around the stream. A new study from the EPA has found that borders of at least 50 meters are required for optimal removal of the human-produced nitrogen […]
![Girth, Not Length, Makes For Healthy Streams stream_park](https://www.scienceagogo.com/wp-content/uploads/2016/07/stream_park-1-100x100.jpg)