| − | Stormwater filtration is a key element of urban runoff management, helping to improve [[Water quality|water quality]] by removing suspended solids and associated pollutants. Filtration can help achieve total suspended solids (TSS) removal targets and contributes to overall watershed health.<ref>Purvis, R. A., Winston, R. J., Hunt, W. F., Lipscomb, B., Narayanaswamy, K., McDaniel, A., Lauffer, M. S., & Libes, S. (2018). Evaluating the Water Quality Benefits of a Bioswale in Brunswick County, North Carolina (NC), USA. Water, 10(2), 134. https://doi.org/10.3390/w10020134</ref> Filtration works by conveying stormwater through a [[Bioretention: Filter media|filter medium]] that captures solid particles and pollutants. In most stormwater treatment systems, water is driven through the filter by a pressure difference created by gravity or hydraulic head. | + | As stormwater flows over impervious surfaces such as pavement and rooftops, it collects sediment and other pollutants before entering nearby waterways. Stormwater filtration is a key element of urban runoff management, helping to improve [[Water quality|water quality]] by removing suspended solids and associated pollutants. Filtration can help achieve total suspended solids (TSS) removal targets and contributes to overall watershed health.<ref>Purvis, R. A., Winston, R. J., Hunt, W. F., Lipscomb, B., Narayanaswamy, K., McDaniel, A., Lauffer, M. S., & Libes, S. (2018). Evaluating the Water Quality Benefits of a Bioswale in Brunswick County, North Carolina (NC), USA. Water, 10(2), 134. https://doi.org/10.3390/w10020134</ref> Filtration works by conveying stormwater through a [[Bioretention: Filter media|filter medium]] that captures solid particles. In most stormwater treatment systems, water is driven through the filter by a pressure difference created by gravity or hydraulic head. |