Answer
If the material from the mass-wasting event had completely filled the stream, it could have led to the development of a natural dam or a landslide dam. The debris flow material, when deposited in the stream channel, could act as an impoundment, blocking the flow of water downstream. As water accumulates behind the debris, it may create a temporary natural dam. This dam could lead to the formation of a lake or pond, causing water to back up upstream and posing a risk of flooding in the surrounding areas. If the dam were to breach suddenly, it could release a catastrophic flood downstream, affecting the area and infrastructure downstream of the dam. Such events have been observed in various regions and can have significant impacts on local communities and ecosystems.
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