Â­TÂ­here are many different ways to create a motion sensor. For example: 1  It is common for stores to have a beam of light crossing the room near the door, and a photosensor on the other side of the Â­room. 2  When a customer breaks the beam, the photosensor detects the change in the amount of light and rings a bell.
Definition of weir. 1  1 : a fence or enclosure set in a waterway for taking fish. 2  2 : a dam in a stream or river to raise the water level or divert its flow.
A curmudgeon with years of practice. Effluent is the liquid discharged from any source. Effluents can originate from municipalities, industries, farms, ships, parking lots and campgrounds.There is a connotation that effluent contains contaminants but in the strictest sense it could be pure water.nfluent is wastewater flowing into a treatment plant. Effluent is water that has received primary, secondary, or advanced treatment to reduce its pollution or health hazards â¦ and is subsequently released from a wastewater facility after treatment.