In addition, the parent comment has omitted groundwater. Good current estimates for groundwater volume (in the OP, http://water.usgs.gov/edu/earthhowmuch.html

In addition, the parent comment has omitted groundwater. Good current estimates for groundwater volume (in the OP, http://water.usgs.gov/edu/earthhowmuch.html http://water.usgs.gov/edu/earthhowmuch.html) are very close to icecap volume (24e6 km^3). And we are pumping this groundwater (~700 km3/yr as of 2000, and increasing [ * ]), which raises water levels and at the same time lowers land elevation as ground subsides. Depending on the Hollywood disaster scenario, that could play a role. Atmospheric water, on the other hand, is a rounding error in this context. [*]: See fig. 3 of http://onlinelibrary.wiley.com/doi/10.1029/2010GL044571/full http://onlinelibrary.wiley.com/doi/10.1029/2010GL044571/full