The speed at which water fills a bucket depends on several factors, including the water pressure and the diameter of the tap or faucet. There can be various reasons why the downstairs tap fills a bucket faster than the upstairs tap:
Water Pressure: Water pressure is typically higher on lower floors because the water has to be pumped or pushed up to reach higher levels. Downstairs taps usually benefit from higher water pressure, resulting in a stronger flow and faster filling of the bucket.
Height and Gravity: The upstairs tap has to overcome the force of gravity to push the water downward. As water travels vertically, it can lose some pressure due to friction and resistance from the pipe. The downstairs tap, being closer to ground level, doesn't have to fight against gravity as much, resulting in a more efficient flow.
Plumbing Design: The plumbing system is designed to distribute water evenly throughout a building, but there may be variations in the size and layout of the pipes. It's possible that the pipes leading to the downstairs tap are wider or have fewer bends and obstructions, allowing for a greater volume of water to flow and fill the bucket more quickly.
Distance from the Water Source: If the water source is located at a lower level or closer to the downstairs tap, it would require less time for the water to reach and fill the bucket. On the other hand, the upstairs tap may be farther away from the main water supply, leading to slightly longer travel time for the water and a slower fill rate.
It's important to note that these factors can vary depending on the specific plumbing setup in a building. If you're experiencing a significant difference in fill rates between taps in your home, it may be worth having a plumber inspect the system to ensure everything is functioning properly.