Timelapse video has captured just how quickly floodwaters rose along the Llano River in Kingsland, Texas.

The video, which was sped up and taken on Friday, shows the water rush in and rise within 30 minutes.

Officials in charge of the search for flood victims have stated that they will postpone discussing inquiries about weather alerts and the lack of evacuation from some summer camps before flooding claimed the lives of at least 104 people.

The disaster along the Guadalupe River, near San Antonio, has sparked a major search operation. In the meantime, officials are being questioned about how well-prepared they were and how quickly they acted initially.

The floods grew to their worst at the midpoint of a long holiday weekend when many people were asleep.

In the central part of Texas, known as the Hill Country, the landscape is naturally susceptible to flash floods. This is due to the dry, densely packed soil that causes rainwater to flow over the surface rather than being absorbed.

Friday’s flash floods started with a particularly bad storm that dropped most of its 30 centimetres of rain in the dark early morning hours.

After a flood watch notice midday Thursday, the National Weather Service office issued an urgent warning around 4 am that raised the potential of catastrophic damage and a severe threat to human life.

By at least 5.20am., some in the Kerrville City area say water levels were getting alarmingly high.

The massive rain flowing down hills sent rushing water into the Guadalupe River, causing it to rise eight metres in just 45 minutes.

The flash floods have erased campgrounds and torn homes from their foundations.