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2. 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.

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. 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 ...

5. Sanitary sewer - Wikipedia

   en.wikipedia.org/wiki/Sanitary_sewer

   Effluent sewer systems, also called septic tank effluent drainage (STED) or solids-free sewer (SFS) systems, have septic tanks that collect sewage from residences and businesses, and the effluent that comes out of the tank is sent to either a centralized sewage treatment plant or a distributed treatment system for further treatment. Most of the ...

6. Drip irrigation - Wikipedia

   en.wikipedia.org/wiki/Drip_irrigation

   Drip irrigation systems distribute water through a network of valves, pipes, tubing, and emitters. Depending on how well designed, installed, maintained, and operated it is, a drip irrigation system can be more efficient than other types of irrigation systems, such as surface irrigation or sprinkler irrigation.

7. Watershed delineation - Wikipedia

   en.wikipedia.org/wiki/Watershed_delineation

   Watershed delineation is the process of identifying the boundary of a watershed, also referred to as a catchment, drainage basin, or river basin.It is an important step in many areas of environmental science, engineering, and management, for example to study flooding, aquatic habitat, or water pollution.