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  2. Emisor Oriente Tunnel - Wikipedia

    en.wikipedia.org/wiki/Emisor_Oriente_Tunnel

    This tunnel will help prevent flooding and serves as an alternate exit for the Emisor Central, another drainage tunnel. In order to prevent collapse, the tunnel is constructed using a lining with segmental rings made of concrete and steel. The estimated cost for the tunnel was 15 billion pesos. After completion, the tunnel was realized to have ...

  3. Open collector - Wikipedia

    en.wikipedia.org/wiki/Open_collector

    For an NPN open emitter output, the collector is connected to the positive voltage rail, so the emitter outputs a high voltage when the transistor is on and is hi-Z when off. For a PNP open emitter output, the collector is connected to the low voltage supply, so the emitter outputs a low voltage when the transistor is on and is hi-Z when off.

  4. Level spreader - Wikipedia

    en.wikipedia.org/wiki/Level_spreader

    Illustration of a level spreader designed to infiltrate road drainage. A level spreader is an erosion control device designed to reduce water pollution by mitigating the impact of high-velocity stormwater surface runoff. It is used both on construction sites and for permanent applications such as drainage for roads and highways.

  5. Common collector - Wikipedia

    en.wikipedia.org/wiki/Common_collector

    The transistor continuously monitors V diff and adjusts its emitter voltage to equal V in minus the mostly constant V BE (approximately one diode forward voltage drop) by passing the collector current through the emitter resistor R E. As a result, the output voltage follows the input voltage variations from V BE up to V +; hence the name ...

  6. Atmospheric vacuum breaker - Wikipedia

    en.wikipedia.org/wiki/Atmospheric_vacuum_breaker

    AVBs must be installed a minimum of 6 inches above the highest usage point in the system (i.e. sprinkler, drip emitter, etc.) Underground installation of AVBs is entirely ineffectual in providing backflow protection as groundwater in the underground vault could be drawn into the water system, contaminating it.

  7. Telescopic toilet - Wikipedia

    en.wikipedia.org/wiki/Telescopic_toilet

    A telescopic toilet, retractable toilet, or pop-up toilet, is a type of toilet which is stored underground and then raised (usually hydraulically) ...

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