Reasons for Mobile Toilet Falling

The reasons for mobile toilets falling are mainly influenced by two aspects: their own conditions and external environment, as detailed below:

Regarding their own conditions:
Firstly, the method of fixation is a crucial factor. If the bottom of a mobile toilet is not equipped with sturdy fixing devices, such as ground nails, expansion bolts, or counterweights for anchoring, it is highly susceptible to displacement or even toppling under strong winds or external forces. Conversely, if a metal frame is deeply fixed to the ground or a concrete base is used to enhance stability, the wind resistance will be significantly improved.
Secondly, structural design and material selection directly affect stability. Toilets with a lower center of gravity (such as those with a wide base and narrow top) are more resistant to overturning than tall and slender structures. Toilets made of heavy materials like metal or concrete, due to their greater weight and inertia, can generally remain stable in winds of 5-6 levels, whereas those made of lightweight plastic are more easily blown by the wind. Additionally, the structural robustness is also vital. If the toilet frame has welding defects, loose connectors, or insufficient overall strength, it may collapse due to local stress imbalance, even if the material is heavy.
Lastly, malicious acts by third parties are also a factor that cannot be ignored. For example, in the case of the mobile toilet toppling incident at Monte Stella Park in Milan, Italy, the court determined that it was caused by human sabotage (such as pushing or hitting). Such non-natural factors can directly disrupt the balance of the toilet.

Regarding the external environment:
Wind strength is the primary risk source. Gales of level 10 or above (with wind speeds of approximately 24.5-28.4 meters per second) may pose a threat to mobile toilets of any structure, and even reasonably designed toilets may topple due to excessive wind pressure. Moreover, terrain and shelter conditions significantly affect the impact of wind. In open areas (such as squares or grasslands) or on hilltops without shelter, the wind blows directly, and the toilet, with a large wind-exposed area, has a higher probability of collapsing. In contrast, in leeward areas sheltered by buildings, trees, or mountains, the wind speed decreases, and the risk is relatively lower.
The combined effects of extreme weather conditions may also exacerbate risks. For example, heavy rain can soften the soil, potentially weakening the grip of the fixing devices; strong winds accompanied by sand and dust can wear down the structural connections of the toilet, reducing stability; and even geological activities like earthquakes can indirectly cause the toilet to topple through ground vibrations.