whenever water comes into a home, it has to have a way to leave after it’s been used. This is where the importance of drains and proper drainage comes into play.
Each fixture has its own drain line; each of the drain lines ties into a larger main line, which takes the water out of the house.
People who live in urban and suburban areas and get their water from a municipality usually have their waste water drain into a sewer system.
The most important component of a drain, which most people take for granted, is the trap.
They’re called traps because they do just that: trap water inside, preventing sewer gases from coming back into the house.
Vents are a major component in a home’s drainage system. Venting allows water to pass out of the drains easily. Today, houses are vented through the roof. Roof flashing, made from heavy grade rubber, lead or sheet metal holds the vent pipe in place.
Another thing to consider is pitch. Pitch simply means the angle in which water will flow easily and gradually with the help of gravity. Every drainpipe, whether underground or in a wall, must have some type of pitch and be sloped properly to allow wastewater leaving the home to drain out.
To ensure water will drain properly and won’t back up in the line, a good rule of thumb to follow when installing pipe is a drop of 1/4 inch per foot. Gravity makes water go down, but drains in most toilets need water pressureto push the water though the drain. The is becouse of the “S” trap on the back of the commode. The high end of the trap forces a certain amouny of water to remain in the bowl until more wateris dropped from a higher position )the tank behind the commode) to force (or flush) the contents of the bowl through the trap.
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