The study looked at phosphorus pollution in urban runoff in Wenzhou City. They measured different types of phosphorus and other substances in runoff from different areas. They found that phosphorus levels varied in runoff, with particulate phosphorus dominating at first, then dissolved phosphorus increasing later on. Some types of runoff could harm water bodies. The first flush effect, where phosphorus levels are higher at the start of runoff, was common. Different management plans are needed to reduce phosphorus pollution in urban runoff, and reducing total suspended substances can help decrease phosphorus pollution.