On many occasions, a tenant would ring me and tell me that the water in their kitchen sink or laundry tub won't drain. The tenant would say that it would also overflow and smell bad "on the outside of the house". I can sense the frustration that the these tenants cannot give the exact word of the object being referred to but have a theory that they are referring to the "gully trap" defined as:
"...a basin in the ground which receives piped wastewater from your kitchen, bathroom and laundry before it is emptied into the sewer. The basin has a water seal to prevent foul odours of the sewer reaching the surface. The top or surround is raised above ground level to prevent stormwater and other foreign matter entering the sewer." (Source of image and definition: Waterline. A Tauranga City Council Service.)
To solve the overflowing of water from the gully trap, one can contact a drain unblocker or a plumber who does drain unblocking.
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