The Pressure at domestic taps will rely on how high the supplying reservoir or water tower sits above the home, or on the volume of water is being taken by other consumers. Water pressure varies at certain times of the day. The pressure is usually high later in the night as little water is being drawn from network and the majority of people are not using their taps. During the morning as people are bathing or showering, or even watering their garden on a hot summer evening, there is a larger demand for water which also causes lower water pressure. A professional tradesman from SW1 Plumbers understands water pressure. Water pressure can be explained by the example of a cylinder fitted in a loft that contains a large volume of water. The cylinder is the main feed for outlets fitted upstairs and downstairs. If we were to measure the pressure of the water downstairs we would find that it is much higher than that found upstairs.If you have a garden hose and you open the nozzle slightly, the velocity or jet would definitely be very fast, indicating a high pressure. Now if you if open the nozzle to its maximum, the high pressure jet would fade away somewhat as a greater amount of water flows but the pressure became lower. A professional tradesman like an SW1 Plumber understands flow rates. The flow rate, however would be a lot larger. The Flow rate of a water supply is normally found by working out the volume of water that can flow compared to the time span. A 2ltr bucket takes 20seconds to fill up, so the rate of flow will be 0.1litres per second. The Weir Cup is a piece of kit that is designed to measure the rate of flow by allowing the water to flow through it. It is like a measuring jug but with an outlet at the bottom for the water to pass out.




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