To halt a pyroclastic flow,one could use many of the same techniques as are used for lava,because both are flowing fluids.

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Pyroclastic flows are not flowing fluids like lava, they are fast-moving clouds of burning gas, ash, and rocks that can travel at speeds of up to 450 miles per hour. Pyroclastic flows are extremely dangerous and can be almost impossible to stop, as they often follow the path of least resistance and can travel over obstacles such as hills and valleys. Therefore, the techniques used for stopping lava may not be effective for halting a pyroclastic flow.

To Halt a Pyroclastic Flow,one Could Use Many of the Same