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In this puzzle you should fill the imaginary small squares in each row and column up to the number that is written next to it with water. You can't fill a square if the squares connected to it(under and left and right of it-without any limits between them)are empty. And one more point is that you can't fill a square that under it is an empty square because the water falls down because of gravity.(you should pay attention to simple physics laws) There are 2 wrong examples:

And this is the question! :

This puzzle has been invented by Sharif university's students.

EDIT: If OP doesn't mind, here is the grid in ASCII form. Regions are represented by letters A-Z and numbers 0-3.

AAABCCDDDDEE
FABBBCGGEEEH
FAAICCGJJEHH
IIIIKGGLJJJH
IMIKKKKLLNNH
MMMMKOPPLLNQ
MRROOOPSSNNQ
TRUOUPPPSSNQ
TRUUUVWPXYYY
RRZZZVWWXX0Y
1ZZ2VVVWX00Y
1112222W3300

In this puzzle you have to fill with water some cells of the grid. The number of filled squares in each row and column is written next to it. 

You can't fill a square if the squares connected to it  (under, left and right) in the same region are empty. Also, you can't fill a square if the square under it is empty because the water would fall down (you should pay attention to simple physics laws such as gravity).

Here are 2 wrong examples:

1 - you can't fill half of a imaginary square:

2 - you should pay attention to gravity:

And this is the question:

This puzzle has been invented by Sharif university's students.

EDIT: If OP doesn't mind, here is the grid in ASCII form. Regions are represented by letters A-Z and numbers 0-3.

AAABCCDDDDEE
FABBBCGGEEEH
FAAICCGJJEHH
IIIIKGGLJJJH
IMIKKKKLLNNH
MMMMKOPPLLNQ
MRROOOPSSNNQ
TRUOUPPPSSNQ
TRUUUVWPXYYY
RRZZZVWWXX0Y
1ZZ2VVVWX00Y
1112222W3300