Hi Jade, it certainly is a problem if waterways dry up. While the trees themselves may survive if their routes dig deep into the ground for water, it would be disastrous for other flora and fauna.
The museum is aware that it's important to conserve water and also for us to raise awareness of this issue.
Also, the Royal Exhibition Building next to the museum, has been landscaped and underwater tanks have been installed in order to recycle rainwater. These are just two of the ways the museum is working to both conserve water and raise awareness. Of course it's up to everyone out there to get on board too!