It was naturally vulnerable to flooding by hurricane storm surges and heavy rainstorms. Natural disasters such as floods and cyclones accompanied by storm surges periodically affect the country. The main natural hazards are floods, storms, and storm surges. These ecosystems protect against storm surges, waves and tsunamis. Storm surges and high tides pose the greatest danger. Most casualties during tropical cyclones occur as the result of storm surges. Over the years there have been many storm surges and floods in the Netherlands. All three types of trees absorb the energy of waves and storm surges. These areas are subject to higher storm surges with smaller waves. They warn the public during storm surges. Cyclone walls planted within trees are in place to protect vulnerable areas from storm surges. Regions that are prone to storm surges, such as London, are also threatened. Some power strips provide protection against electrical power surges. The coast is subject to storm surges. It is believed that it does moderate the effects of storm surges on the bay.