If a water pump is placed at the bottom of a container and used to fill the container it would need to pump against the pressure of standing water. If a weighted object is floated on the surface of the same water within the container, is the pump required to work harder to fill the container? Is there an equation I can use to calculate the differance in pumping pressure in both situations? Thanks
Point 2: Looking at the image below is there an equation which states the pump power (CBM/s) based on the weight of object X, Float Y, and the amount of water in the tank CBM? To put this into context the weight (in this case X) would be a concrete basin filled with soil sitting on top of a floating pontoon (Y) inside a concrete basin. The pump would push water below the basin lifting it up (by a height of around 5-10m. The calculation needs to take account of the size of the basin which could be built according to the specifications.