Flood waters seriously damaged parts of Liverpool's Childwall Synagogue this week after torrential downpours left large parts of the city under water and many main roads closed.
The shul's Harris Polak and Aida Shifrin halls were filled with two inches of water as Tuesday's rains led to the collapse of a ceiling over one of the rooms.
Overflow from drains, which struggled to cope, brought more water into the Childwall building, which sits 20ft below street level.
The synagogue has been attempting to raise between £75,000 and £100,000 for essential work that is needed on its roof, heating and wiring.