Does the Great Sphynx at Giza show evidence of water erosion?

Yes on one, no on two, though it's rather more complicated than that. There are signs of water-related weathering on the Sphinx. However, there are two notable reasons for that which have nothing to do with great antiquity. read more

The Sphinx water erosion hypothesis is a fringe claim contending that the main type of weathering evident on the enclosure walls of the Great Sphinx was caused by prolonged and extensive rainfall that would have predated the time of Djedefre and Khafre, the Pharaohs credited by most modern Egyptologists with building the Great Sphinx and Second Pyramid at Giza around 2500 BC. read more