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  2. Topographic wetness index - Wikipedia

    en.wikipedia.org/wiki/Topographic_Wetness_Index

    The topographic wetness index (TWI), also known as the compound topographic index (CTI), is a steady state wetness index. It is commonly used to quantify topographic control on hydrological processes. [1] The index is a function of both the slope and the upstream contributing area per unit width orthogonal to the flow direction.

  3. 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.

  4. Watershed delineation - Wikipedia

    en.wikipedia.org/wiki/Watershed_delineation

    The conventional method of finding a watershed boundary is to draw it by hand on a paper topographic map, or on a transparent overlay.The watershed area can then be estimated using a planimeter, by overlaying graph paper and counting grid cells, or the result can be digitized for use with mapping software.

  5. Flow coefficient - Wikipedia

    en.wikipedia.org/wiki/Flow_coefficient

    A simplified version of the definition is: The k v factor of a valve indicates "The water flow in m 3 /h, at a pressure drop across the valve of 1 kgf/cm 2 when the valve is completely open. The complete definition also says that the flow medium must have a density of 1000 kg/m 3 and a kinematic viscosity of 10 −6 m 2 /s , e.g. water.

  6. Plumbing fixture - Wikipedia

    en.wikipedia.org/wiki/Plumbing_fixture

    The visible water surface in a toilet is the top of the trap's water seal. Each fixture drain, with exceptions, must be vented so that negative air pressure in the drain cannot siphon the trap dry, to prevent positive air pressure in the sewer from forcing gases past the water seal, and to prevent explosive sewer gas buildup.

  7. Zillow predicts hottest housing markets of 2025: See which ...

    www.aol.com/zillow-predicts-hottest-housing...

    Zillow's top 10 hottest housing markets of 2025. The primary reasons Buffalo was number one again, according to Zillow? Job and wage growth, relative affordability and demand that outweighs supply.

  8. Piping and instrumentation diagram - Wikipedia

    en.wikipedia.org/wiki/Piping_and_instrumentation...

    Valves and their types and identifications (e.g. isolation, shutoff, relief and safety valves, valve interlocks) Control inputs and outputs (sensors and final elements, interlocks) Miscellaneous - vents, drains, flanges, special fittings, sampling lines, reducers and swages; Interfaces for class changes; Computer control system

  9. ‘Why we never got Ebola’ by Huffington Post

    testkitchen.huffingtonpost.com/ebola

    What one nurse learned about humanity amidst the Ebola epidemic

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