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A diagram of a traditional French drain. A French drain [1] (also known by other names including trench drain, blind drain, [1] rubble drain, [1] and rock drain [1]) is a trench filled with gravel or rock, or both, with or without a perforated pipe that redirects surface water and groundwater away from an area.
A sanitary sewer is an underground pipe or tunnel system for transporting sewage from houses and commercial buildings (but not stormwater) to a sewage treatment plant or disposal. Sanitary sewers are a type of gravity sewer and are part of an overall system called a "sewage system" or sewerage .
Schematic of a simplified sewer: Smaller diameter pipes are laid at a shallower depth and at a flatter gradient than for conventional sewers. [1]Simplified sewerage, also called small-bore sewerage, is a sewer system that collects all household wastewater (blackwater and greywater) in small-diameter pipes laid at fairly flat gradients.
Onsite sewage facilities (OSSF), also called septic systems, are wastewater systems designed to treat and dispose of effluent on the same property that produces the wastewater, in areas not served by public sewage infrastructure. A septic tank and drainfield combination is a fairly common type of on-site sewage facility in the Western world.
This technique allows the sewer to invisibly attach pockets, facings and trimmings to a garment. [1] A slip stitch or catch stitch can be used to create the blind stitch, except that they are worked inside the hem, 1 ⁄ 8 to 1 ⁄ 4 inch (3.2 to 6.4 mm) away from the edge of the hem fabric. [3] A sewing machine can also create a
However, bureaucratically a condominial system includes the participation of the individuals and owners who will be served and can often result in lower costs due to shorter runs of piping. [1] This is achieved by local concentration of sewage from a single "housing block". Thus a number of dwellings are grouped into a "block" known as a ...