More than £227,000 is needed to complete ongoing works at the NSC.
Tynwald will be asked to approve the funds for the flumes at this month's sitting - taking place next week.
The Department of Education, Sport and Culture says the overspend is because of ongoing problems regarding the leisure pool and flumes.
The facility has been closed since August 2018.
Port Erin crimewave this week 'just training' say police
Port Erin's going to become the crime capital of the island this week - but police say not to worry.
Island's role in $95 million US lottery scheme revealed
It's emerged the Isle of Man was pivotal to a lottery scandal in America.
Steam Packet Board instead of Company?
Should the Steam Packet Company stop being a government-owned company and become a statutory board like Manx Utilities instead?
Homeschool students could get their own prom
A Douglas mum says she's hoping to arrange a school prom for homeschooled youngsters, and is asking for support from other parents.
Mountain Road shut for TT work
Part of the Mountain Road closes later as work gets underway to ready it for TT.
Chicken Jockey fans ruining Minecraft Movie for others, say mums
Parents have taken to Facebook to complain about the behaviour of some cinemagoers at the latest smash hit movie for kids - saying some are ruining it for others.
Airline releases winter schedule early!
Logainair says it's launched its winter schedule to allow people to book their flights early.
Pensions triple-lock up for discussion in Tynwald
Treasury Minister Alex Allinson is to ask Tynwald members to back moves asking the public about the future of pensions.
