Valley of the Kings rains. There is currently little year-round rain in this part of Egypt, but there are occasional flash floods that hit the valley, dumping tons of debris into the open tombs. The quality of the rock in the Valley is inconsistent, ranging from finely-grained to coarse stone, the latter with the potential to be structurally unsound. The occasional layer of shale also caused construction and conservation difficulties, as this rock expands in the presence of water, forcing apart the stone surrounding it. It is thought that some tombs were altered in shape and size depending on the types of rock the
Valley of the Kings I) and ending with Ramesses X or XI, although non-Royal burials continued in usurped tombs. Despite its name, the Valley of the Kings also contains the tombs of favorite nobles as well as the wives and children of both nobles and pharaohs. Therefore, only about 20 of the tombs actually contain the remains of kings. The remains of nobles and of the royal family, together with unmarked pits and embalming caches, make up the rest. Around the time of Ramesses I (ca. 1301 BC) construction commenced in the separate Valley of the Queens. The official name for the site in