Some parts of the world are really well developed which means that the people that live there are never going to have to face a shortage of water in any way, shape or form. This means that they can use water without having to worry about it running out, but not all of the countries of the world are this lucky. In fact, some areas are so water scarce that there is a hard limit to how much water you might just end up having at your disposal.
In a lot of countries people need to fill up water tanks and be very careful about how much water they consume on a regular basis. It can be difficult to live like this, but it is a necessity if you want to sustain the manner in which you have currently chosen to end up living your life. You can make it a bit easier to deal with your life in a water scarce country by figuring out how much water capacity you have so that you can buy water accordingly, and conducting a volume calculation for your water tank is an important first step that you can take towards meeting this goal.
Once you have calculated the volume of your tank, you can better understand how much water you need. The key here is to ensure that your tank never runs dry, as this is the sort of thing that would prevent you from living comfortably. You can keep an eye on water levels and get the tank refilled before it has the chance to run out thereby ensuring a steady and consistent supply of water that you can use for anything.