The flood, the second in Star Road in 10 days, kept managers Kimberley and Greg Hampson up from 10pm to 3.30am and jeopardised an anniversary party to mark a year of holding the licence last night (Thursday).
Kimberley Hampson described the flash flood as 'ironic', coming just eight hours after the road outside had been fixed following torrential rain last Monday (July 28).
A drain, bolted down by water and sewerage company Southern Water, came loose and paving slabs were pushed up from the street.
The water outside the pub was three feet high, the bar was flooded and fire crews called at midnight stayed for an hour pumping water out of the cellar.
Mr Hampson said he hoped to receive compansation from Southern Water, adding, "This could have been avoided.
"The work the water company did was just to make the road look good, it did absolutely nothing to solve the problem and probably wasted four days of work.
"All that messing about to fix the road was a waste of taxpayers' money."
Describing the flash floods, he said, "The drain just opened up, the water in the pub was not just rainwater, it was sewage and all sorts that came up. Not very pleasant."
Mr Hampson said the flooding has been happening for years.
Southern Water had installed non-return valves in the road and bolted down a manhole cover to keep the volume of water caused by excessive rainfall at bay but this did not work.
Boarding up the doors and stacking up sandbags, borrowed in the wake of the first flood, also did not protect the pub.
A spokeswoman for Southern Water said the company took flooding very seriously and crews were due to visit the pub yesterday to assess the damage and investigate why it happened.
She said, "We would like to carry out more work in Star Road to improve the drainage and have included a scheme in our draft business plan for 2010-2015.
"The business plan is due for public consultation from August 11 and our regulator Ofwat will make the final decision regarding how many flood alleviation schemes can be carried out as part of our plans.
"We will then work with the regulator Ofwat and also the Consumer Council for Water to prioritise schemes for those that are most at risk of flooding."
Mr Hampson said the plan to consider works in the 2010-2015 business plan meant potentially another seven years of flood worries at the pub.