A detailed cross-section illustration of a stormwater sock filter, showing incoming runoff flowing through geotextile fabric, sand, biochar, wood fiber media, and inner geotextile, then draining.

A highly detailed, realistic engineering cross-section illustration of a stormwater sock filter installed in front of a roadside storm drain inlet. The sock is cylindrical and placed horizontally across the runoff flow path. Stormwater runoff approaches from the road side and contacts the curved surface of the sock perpendicularly. Water flows laterally through the thickness of the sock, not through its length. The cross-section clearly shows radial flow from the upstream face to the downstream face. The internal structure includes: an outer geotextile fabric layer, a packed filtration media zone containing sand and a biochar–wood fibre blend, and an inner geotextile layer. Blue arrows indicate water moving from one side of the sock to the opposite side, passing through the textile and media layers. No water flows along the centre or length of the sock. The surrounding environment includes pavement, curb, and a storm drain grate downstream. Labels identify: “Incoming Runoff,” “Geotextile Fabric,” “Sand Layer,” “Biochar & Wood Fibre Media,” and “Filtered Runoff to Drain.” Emphasize that the sock functions as a permeable barrier, not a conduit or pipe. Style: clean technical illustration, realistic textures, accurate scale, neutral background, professional civil/environmental engineering diagram, no artistic exaggeration, no pipe-like flow, no axial arrows. See more