Straight off the bat and the most common reason is the drain becomes blocked with foreign objects or debris this can block a drain once all the items build up and start getting caught in the drainpipe.
It will start with the flow being restricted and then it will fully restrict the flow and you will be required to call a Plumber Wilston out to clear the drains.
Water from storms and floods caused by lots of continued rain are also a big issue in Brisbane and on the North Side and the outer suburbs. As for drains and gutters there is a fair chance that they may become blocked with leaves, twigs or dirt, branches, nuts and bark.
Blocked storm drains will overflow and can cause extreme damage to your property that may end up costly so it is a good idea to maintain your gutters and keep them clean, especially around storm season.
Broken pipes underground will also have the same affect and can be expensive to fix. The roots from trees can ruin old pipes and you may need to get a qualified Plumber in Wilston to run an electric eel down the pipes and cut the roots so the water can flow freely again.