Emptying the pool

 It took 3 adults to tip the pool to empty the dirty water.

I'm estimating that the pool is 2 metres long by 1 metre wide. When we started, there was about 30cm of water in the bottom. A volume of 0.6 cubic metres of water of density 1000 kg/m^3 means 600kg of water. That's 10 times me!

We tried tipping it along the log edge and couldn't get the water over the lip. Mrs B suggested tipping it along the short edge and we managed it. Why did it work? One idea is moments. We had a bigger distance from the load so less force was needed. I'm not convinced this is the whole answer because of how the weight of the water distorts the plastic. We had to push close to the load which negates the idea of bigger distance. It might also be to do with being able to bunch up more on the short edge so that the water couldn't flow into pits between us.