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  2. Chemical drain cleaners - Wikipedia

    en.wikipedia.org/wiki/Chemical_drain_cleaners

    Acidic drain cleaners usually contain sulfuric acid at a high concentration which turns a piece of pH paper red and chars it instantly. Apart from grease and hair, an acidic drain cleaner containing sulfuric acid can be also used to dissolve tissue paper inside water pipes. Acidic drain cleaners usually contain sulfuric acid at high ...

  3. How to snake a drain, according to a plumber - AOL

    www.aol.com/news/snake-drain-according-plumber...

    Mighty Mint Drain Maintainer with Enzymes $14.99 at Amazon. You have to be careful when using a liquid durian cleaner to unclog the drain in your bathtub or sink because some chemicals are ...

  4. French drain - Wikipedia

    en.wikipedia.org/wiki/French_drain

    A diagram of a traditional French drain. A French drain [1] (also known by other names including trench drain, blind drain, [1] rubble drain, [1] and rock drain [1]) is a trench filled with gravel or rock, or both, with or without a perforated pipe that redirects surface water and groundwater away from an area.

  5. Trench drain - Wikipedia

    en.wikipedia.org/wiki/Trench_drain

    The drain is characterized by its long length and narrow width, the cross-section of the drain is a function of the maximum flow volume anticipated from the surrounding surface. Channels can range from 1 inch (2.5 cm) to 2 feet (61 cm) in width, while depths can reach up to 4 feet (120 cm).

  6. Snow removal - Wikipedia

    en.wikipedia.org/wiki/Snow_removal

    The decree of the government of the Protectorate of Bohemia and Moravia No. 1/1943 Sb. said that sidewalk cleaning in residential areas of municipalities with more than 5000 inhabitants, of district cities and of other specified municipalities is a duty of the owner or user of the contiguous land. The municipality was empowered to undertake ...

  7. Drainage gradient - Wikipedia

    en.wikipedia.org/wiki/Drainage_gradient

    Typically on straight road sections, the drainage gradient is at least 1–3% due to the normal cross slope of 1–3%. In curved sections the drainage gradient is higher, and may often reach 5–12% due to superelevated CS that may reach 5–8% in areas with icy roads and up to 12% in areas without icy roads.

  8. Septic drain field - Wikipedia

    en.wikipedia.org/wiki/Septic_drain_field

    Laundry bleach may slow or stop microbial activity in the drain field, and sanitizing or deodorizing chemicals may have similar effects. Detergents, solvents, and drain cleaners may transport emulsified, saponified or dissolved fats into the drain field before they can be catabolized into short-chain organic acids in the septic tank scum layer. [7]

  9. Crosswalks in North America - Wikipedia

    en.wikipedia.org/wiki/Crosswalks_in_North_America

    At signalized intersections, crosswalks may have pedestrian signals which display symbols to mandate when pedestrians may cross the street. State road rules in the United States usually require a driver to yield the right of way to a pedestrian crossing a road when the pedestrian crosses at a marked crosswalk or an unmarked crosswalk. [ 2 ]

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