Old floor drains work passively their design based on principles of physics.
Old basement floor drain diagram.
The purpose of this drain trap is to hold standing water which seals the drain system and prevents sewer gases from.
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Water runs down the sink drain into a p trap so called because it s shaped like the letter which fills up with water to prevent sewer gases and odors from getting into the house through the pipe.
This water gets refreshed whenever more water runs through it.
In many older homes floor drains are part of the basement design built in to prevent water damage to the house and its contents.
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Many basement floor drains tie directly to the home s sewer system but in some communities local building codes require floor drains to run to a sump pit where a pump lifts the water to the exterior surface of the house.
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Many new homes also utilize these types of drainage systems.
This diagram of a typical dwv system is called a plumbing tree.
This is an expensive repair as it involves breaking up the concrete in the basement floor replacing the drain then pouring new concrete.
Floor drains are an effective way to remove excess water from a home.