This tree which was a Eucalyptus teriticornis it fell over during strong wind and rain.

On closer inspection the trees root system has rotted away with the root system suffocating due to anaerobic soil conditions.

From above ground there was little signs of the condition but to a trained arborist with an understanding of tree species and tree body language ,the problem could have been diagnosed. The tree may have been saved or removed preventing the costly damage to the shed and pool fence.
If you have trees it is recommended they are assessed by a qualified arborist, contact Sydney Tree Removals, we not only remove trees but also provide preventative treatment to allow trees to maintain good health and vigour.

If there are trees that are of concern we can provide an informed hazard assessment with accurate information, this can help you make an informed decision as to what is your best coarse of action.