"Water gate" of Delhi's Red Fort: One truth and many tales

Delhi’s Red Fort was built in 1639 by Shah Jahan, the eminent Mughal Emperor. Over several years, by successive rulers and then during British rule, the site has undergone so much changes that except for a few isolated east side pavilions, nothing else survives. Red Fort, because of its architecture, has always been place of attraction at the hands of historians, and they all have described it in detail. However there is very limited and contradictory information available about small yet magnificient Asad Burj Water Bastion that exists silently in east corner of Red Fort. Even Mohammad Waris, first one to give minute description of Red Fort, do not describe this side of fort in details.  Many authors mention water bastion as a ‘Water Gate’, sounding like an exit gate, which, in my conclusion, never was (a true gate).