water tank Height - 2m Width- 1m

Lacking data. What is its shape?

It's a cuboidal tank

To determine the water capacity of a tank, you need to multiply the height, width, and length of the tank.

In this case, you provided the height and width of the tank, but not the length. Without the length, it is not possible to calculate the water capacity accurately.

If you can provide the length of the tank, I would be able to help you calculate the water capacity.