 Recent studies have shown that there are at least seven active flood stream beds leading down into the central area of the valley.This central area appears to have been flooded at the end of the Eighteenth Dynasty, with several tombs buried under metres of debris.The tombs KV63, KV62, and KV55 are dug into the actual wadi bedrock rather than the debris, showing that the level of the valley was five meters below its present level.