Is it permissible to build two-story graves for the separate burial of men and women in the Nile Delta due to the nature of the land, high groundwater levels, exorbitant land prices, and poverty? And what is the solution if that is not permissible?

Burying on the surface of the earth is impermissible unless there is a necessity, such as the ground being wet or water gushing out when digging deep. If such a necessity arises, the grave should be treated in a way that prevents water from reaching the deceased, like using wood or stones. Sheikh Ibn Baz and Sheikh Ibn Uthaymeen were asked about this issue and both affirmed that the اصل (principle) is to bury in the earth, and that building over graves is forbidden. However, if the land is very watery and digging is impossible, then there is no harm in placing the deceased in a coffin or something similar to protect them from water. If the cemetery land is limited and there is a compelling need to bury the deceased with previously buried individuals or to build above ground, then it is permissible only to the extent of the necessity, to preserve the deceased, protect their dignity, and prevent odors, and not for glorification or exaggeration.