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  2. Virginia Graeme Baker Pool and Spa Safety Act - Wikipedia

    en.wikipedia.org/wiki/Virginia_Graeme_Baker_Pool...

    In June 2002, Graeme was stuck to a hot tub drain by suction. Efforts by her mother to free her were unsuccessful and when two men eventually were able to free her (postmortem), the drain broke from the force. Although Graeme drowned, her official cause of death was "suction entrapment due to a faulty drain cover". Following Graeme's death in ...

  3. Air gap (plumbing) - Wikipedia

    en.wikipedia.org/wiki/Air_gap_(plumbing)

    According to the International Residential Code 2003, an air gap length must meet the requirements of being two times the effective inner diameter of the pipe (2×D) in order to be sufficient. [2] A standard widely use in the United States is: A112.1.2 Air Gaps in Plumbing Systems (For Plumbing Fixtures and Water-Connected Receptors)

  4. Bathtub curve - Wikipedia

    en.wikipedia.org/wiki/Bathtub_curve

    The bathtub curve is a particular shape of a failure rate graph. This graph is used in reliability engineering and deterioration modeling. The 'bathtub' refers to the shape of a line that curves up at both ends, similar in shape to a bathtub. The bathtub curve has 3 regions: The first region has a decreasing failure rate due to early failures.

  5. Drainage equation - Wikipedia

    en.wikipedia.org/wiki/Drainage_equation

    the design drain spacing (L) can be found from the equation in dependence of the drain depth (Dd) and drain radius (r). Drainage criteria One would not want the water table to be too shallow to avoid crop yield depression nor too deep to avoid drought conditions. This is a subject of drainage research.

  6. Drainage law - Wikipedia

    en.wikipedia.org/wiki/Drainage_law

    In the State of Michigan, drainage law is so important that most counties still elect a drain commissioner to regulate drainage of surface water. Common enemy doctrine [ edit ]

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  8. Fixture unit - Wikipedia

    en.wikipedia.org/wiki/Fixture_unit

    In plumbing, a Fixture Unit (FU) or Drain Fixture Unit (DFU) is "a unit of measure, based on the rate of discharge, time of operation and frequency of use of a fixture, that expresses the hydraulic load imposed by that fixture on the sanitary plumbing installation". [1] A Fixture Unit is not a flow rate unit but a design factor.

  9. Bathtub refinishing - Wikipedia

    en.wikipedia.org/wiki/Bathtub_refinishing

    Bathtub refinishing (also known as bathtub reglazing, bathtub resurfacing, or bathtub re-enameling) is a process of restoring the surface of a bathtub to improve its appearance and durability. It involves applying a new coating or finish on the existing bathtub surface, which can be made of materials such as porcelain , fiberglass , acrylic ...

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