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  2. Backflow prevention device - Wikipedia

    en.wikipedia.org/wiki/Backflow_prevention_device

    Backflow prevention device. The simplest, most reliable way to provide backflow prevention is to provide an air gap.An air gap is simply an open vertical space between any device that connects to a plumbing system (like a valve or faucet) and any place where contaminated water can collect or pool.

  3. Backflow - Wikipedia

    en.wikipedia.org/wiki/Backflow

    Backflow occurs for one of two reasons, either back pressure or back siphonage. [1]Back pressure is the result of a higher pressure in the system than in its supply, i.e. the system pressure has been increased by some means.

  4. Regurgitation (circulation) - Wikipedia

    en.wikipedia.org/wiki/Regurgitation_(circulation)

    Tricuspid regurgitation is common and is estimated to occur in 65–85% of the population. [1] In The Framingham Heart Study presence of any severity of tricuspid regurgitation, ranging from trace to above moderate was in 82% of men and in 85.7% of women. [2]

  5. Glossary of environmental science - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_environmental...

    1-in-100 flood – a flood with 1 in 100 chance of occurring in any given year (used as a safety requirement for the construction industry.); 20/30/10 standard - 20 mg/L Biochemical Oxygen Demand (BOD), 30 mg/L Suspended Solids (SS), 10 units of E. coli: the water quality standard for greywater use in toilets, laundry and surface irrigation.

  6. Valvular heart disease - Wikipedia

    en.wikipedia.org/wiki/Valvular_heart_disease

    Valvular heart disease is any cardiovascular disease process involving one or more of the four valves of the heart (the aortic and mitral valves on the left side of heart and the pulmonic and tricuspid valves on the right side of heart).

  7. Trench drain - Wikipedia

    en.wikipedia.org/wiki/Trench_drain

    A trench drain (also known as a channel drain, line drain, slot drain, linear drain, or strip drain) is a specific type of floor drain featuring a trough- or channel-shaped body.

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