The elevation of the Gate of Divine Prowess to the north and the Meridian Gate to the south stands at 46.05 meters and 44.28 meters, respectively, generating a difference of about two meters in ground height. This slope has created advantages for natural drainage so that the ponding could drain slowly.
其中北门神武门地平标高46.05米，南门午门地平标高44.28米，南北地平高差约2米，这一坡降为自然排水创造了有利条件，使积水能缓慢排泄。