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  2. Kola Superdeep Borehole - Wikipedia

    en.wikipedia.org/wiki/Kola_Superdeep_Borehole

    The Kola Superdeep Borehole SG-3 (Russian: Кольская сверхглубокая скважина СГ-3, romanized: Kol'skaya sverkhglubokaya skvazhina SG-3) is the deepest human-made hole on Earth (since 1979), which attained maximum true vertical depth of 12,262 metres (40,230 ft; 7.619 mi) in 1989. [1]

  3. Plug (sanitation) - Wikipedia

    en.wikipedia.org/wiki/Plug_(sanitation)

    A plug in sanitation is an object that is used to close a drainage outlet firmly. The insertion of a plug into a drainage outlet allows the container to be filled with water or other fluids. In contrast to screw on caps, plugs are pushed into the hole and are not put over the hole.

  4. Drip irrigation - Wikipedia

    en.wikipedia.org/wiki/Drip_irrigation

    An emitting pipe is a type of drip irrigation tubing with emitters pre-installed at the factory with specific distance and flow per hour as per crop distance. An emitter restricts water flow passage through it, thus creating head loss required (to the extent of atmospheric pressure) to emit water in the form of droplets.

  5. Montezuma Well - Wikipedia

    en.wikipedia.org/wiki/Montezuma_Well

    The holes around the edge reveal the outline of the structure. Montezuma Well ( Yavapai : ʼHakthkyayva ), a detached unit of Montezuma Castle National Monument , [ 1 ] is a natural limestone sinkhole near the town of Lake Montezuma , Arizona , through which some 1,500,000 US gallons (5,700,000 L; 1,200,000 imp gal) of water emerge each day ...

  6. Drain-waste-vent system - Wikipedia

    en.wikipedia.org/wiki/Drain-waste-vent_system

    A sewer pipe is normally at neutral air pressure compared to the surrounding atmosphere.When a column of waste water flows through a pipe, it compresses air ahead of it in the system, creating a positive pressure that must be released so it does not push back on the waste stream and downstream traps, slow drainage, and induce potential clogs.

  7. Giant's kettle - Wikipedia

    en.wikipedia.org/wiki/Giant's_kettle

    Glacial pothole in Bloomington on the St. Croix River at Interstate State Park, Wisconsin, U.S.. A giant's kettle, also known as either a giant's cauldron, moulin pothole, or glacial pothole, is a typically large and cylindrical pothole drilled in solid rock underlying a glacier either by water descending down a deep moulin or by gravel rotating in the bed of subglacial meltwater stream. [1]