Today we ran out of water, quite deliberately, as we wanted to measure the tank capacity and get a feel for how the water gauge relates to the amount of water we have left.
Our water tank is in what is usually the Gas Locker. For none boaters that is the very bow of the boat. This means it has a complicated shape which is small at the bottom and large at the top.
As we filled the tank I measured the voltage from the water sensor every 5 minutes and noted how full the tank gauge read.
It turns out that when the gauge says we are half full we are in reality a quarter full, and when the gauge reads a quarter full we are very close to completely empty. To give you an idea of how extreme this is, the gauge read nearly a quarter full after filling for 5 minutes but it took 1 hour and 50 minutes to fill the tank.
This graph illustrates how quickly we run out of water once the gauge shows a quarter left.
Of course, the aim is never to run out of water, so todays measurements will help us manage our water supply and to plan when we stop at water points to take on more water.
Water points are distributed along the canals and clearly marked on canal maps. As we intend to continuously cruise (move on every few days) we should be passing water points every few days as we go.