To put those efforts in perspective, Schimanski's times were the third fastest of all of females - youth and adult - during the competition, only bettered by two open women's competitors.
Outside of that specialty discipline, Schimanski also claimed a sharp silver medal in the 50m backstroke, 5th in the 100m individual medley and came 8th in the 200m freestyle.
The breaststroke events proved very successful for the Jazmin Phillips, 15, who won silver in both the 15-year-old 100m and 200m in personal best times.
She also showed versatility with a 5th place in the 100m individual medley and 8th in the 400m version.
Wanganui's set of medals was completed by 16-year-old Laura O'Keeffe's with bronze in the 200m and 400m freestyle events, while creating a significant bit of local history.
O'Keeffe's 400m time of 4m 30.07s broke Lisa Hartshorne's 32-year-old Wanganui record by more than a second.
Delighted head coach Andy McLay said he was not even born in 1982 when Hartshorne set that long-standing mark, while the 100m record Schimanski broke was set by fellow Wanganui coach Hannah Roxburgh in 2005.
O'Keeffe had a busy programme with 5th placings in the 50m backstroke, 100m butterfly and the 400m individual medley, along with 6th for the 50m butterfly and 8th place in the 100m breaststroke.
All of the other Wanganui team recorded personal bests with 13-year-old Grace Hogan's the biggest as she took 16.5s off her previous quickest 400m freestyle time.
Sophie Couper, 16, came 7th in the 50m backstroke, 8th in the 400m individual medley and 9th in the 400m freestyle.
Alex Forlong, 13, placed 7th in the girls 100m butterfly and therefore qualified for the NZ Division 2 competition in Dunedin next March.
Niamh Hogan, 14, swam a big personal best in the 50m backstroke to claim 7th, while 14-year-old Cameron Allardice placed 10th in the 50m backstroke.