For commercial uses all areas where water is located has to have a drain outlet which leads into the sewer. This saves the people below if there is a leak or a burst pipe.
In modern homes the plumbing code requires a drain in the basement usually next to the water source: water heater, water inlet, sewer. This is only smart because water heaters leak when they fail and the water has to have somewhere to go.
In new home designs the commercial aspect of drains is being taken a step further. Kitchens and bathrooms are now being fitted for drains if the home builder wants them. This makes sense because some kitchens now have more than one sink area and almost every home has a dishwasher.
A drain is placed in a spot where an leak will go to a neutral spot, usually in a spot equidistant from all the water sources. The floor is sloped toward this spot so that no extra effort is required to move pooled water from another area if there is a spill. if the kitchen is tiled this is easier to do although vinyl floors can work as well. A floor drain should also have a strainer-cover over it to prevent any vermin from having access.
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