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14:28, 14 September 2019 Mtrojantalkcontribs blocked ZKolsumtalkcontribs with an expiration time of indefinite (account creation disabled) (left agency)
13:52, 11 March 2019diffhist+229 N
File:Sand filtration schematic.jpg
Example schematic of a chemical treatment and sand filtration system. Using an existing detention basin for pretreatment, is often more cost effective than pretreatment tanks. (Source: Federal Highway Administration US DOT, 2008)current
13:52, 11 March 2019diffhist+293 N
File:Downflow dewatering filter.jpg
Downflow dewatering filter constructed from pea gravel. Note sediment filter bag on pipe outlet, which functions as primary removal media. Plastic basin liner extends down stone embankment to basin bottom, allowing downward flows through media while pr...
13:51, 11 March 2019diffhist+299 N
File:Temporary dewatering sediment trap.jpg
Temporary dewatering sediment trap. Note trap liner, which prevents additional sedimentation via erosion of the banks, and stone berm forebay, which removes large particles before flows enter secondary basin for settling prior to exiting through the ou...
13:51, 11 March 2019diffhist+265 N
File:Floating skimmer.jpg
Floating skimmer discharge inlets draw clarified water from just below the surface. Note this skimmer rests on a rock berm when the basin is drawn down, to prevent discharge of muddy bottom water and/or clogging. (Source: Lancaster County, PA Conservat...