Measures put in place following 2015 floods
The NSC has avoided flood damage since a £355,000 flood defence system was installed in 2017.
Doors, barriers, gates and a high river sensor were fitted after floods resulted in significant damage at the sporting facility just over five years ago.
Two rivers near the site burst their banks in December 2015, resulting in flooding at the sports halls, squash court, all-weather pitch, athletics track and the Bowl.
The NSC is evacuated when the river sensor is triggered, something Education, Sport and Culture Minister Dr Alex Allinson says has happened twice:
More than 500 Isle of Man Energy customers overcharged for VAT
Police working with schools to teach children about the dangers of social media
Drivers turning in Douglas Fire Station forecourt leads to 'near misses'
Isle of Man Government ‘closely monitoring’ impact of US trade tariffs