A bit early but this?:
The Little Ark (1972) - IMDb
E.
All I remember is that there was a big flood about half way into the film and the two main characters (a boy and girl aged around ten or eleven) were trapped on the roof of a clock tower of a church, surrounded by water.
Any Ideas?
A bit early but this?:
The Little Ark (1972) - IMDb
E.
I'm sure Euryale is right about this. There are some nice pictures here:
The Little Ark at MovieGoods