"We targeted the meet as one of their goals for the season."
Smith is a breaststroker and will compete in the 50m, 100m and 200m, while Annabell Simpson is a backstroker and will swim the same distances.
Both are also in contention for relay selection.
Smith and Simpson have had extensive training regimes in preparation for the Championships involving eight pool sessions a week as well as gym and Dryland sessions.
Dryland sessions involve land swim-specific training exercises.
Cooper said the girls are aiming to gain maximum points for the NZ team in their respective events.
"This is the Australian State Teams Age Group National Championships which means each team has 40 swimmers and they race for team points to decide on the top State Age Group team in Australia," she said.
"Swimmers compete in combined age groups of 13-14yrs, 15-16yrs and 17-18yrs. Ciara and Annabell are both 15yrs old with Annabell turning 16yr on the first day of the Australian meet."
14-year-old breaststroker Mia Gordon wsa also selected for the team, but is unable to attend.
Smith and Simpson will have little time to recover from the meet as the week after they return they'll join the rest of the Northwave team at the 2016 NZ Short Course Championships.
These take place at the Owen Glenn Aquatic Centre in Albany.
Cooper said the selecion isn't the first accolade for the teenage swimmers.
"Both girls are national medalists with Ciara winning a silver and bronze medal at NZ Opens and gold medals at National Age Championships and Annabell finalist at Opens in the Women's Backstroke evens and a medalist at Age Group level," she said.
The Australian State Teams Age Group National Championships will be held at the Australian Institute of Sport in Canberra from September 23-25.
