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How deep was the ash and volcanic debris that covered Pompeii?

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Ruins of ancient Pompeii with stone columns and walls in the foreground, and Mount Vesuvius rising in the background under a partly cloudy sky. — Pompeii Mount Vesuvius rising up over the ruins of the ancient Roman city Pompeii.

During the eruption of Mount Vesuvius in 79 CE, Pompeii was buried under a significant accumulation of volcanic material.

Initially, ash and other debris poured down on the city, covering it to a depth of more than 9 feet (3 meters). Subsequent pyroclastic flows and further ashfall added at least another 9 feet of debris. Ultimately, the city remained buried under a layer of pumice and ash that reached a total depth of 19 to 23 feet (6 to 7 meters).12