Some councillors say the money would be better spent on existing sporting facilities and housing, especially when a white water rafting centre is already planned for the area.
It would be located near the planned white water rafting facility in the city.
Dublin City Council says this would develop Custom House Quay into a hub for water based recreational activity.
The council will present the plan to councillors next week for their views.
Teen M9 Fatalities Were Known To Gardai in West Wicklow
The 15 to 18 years old had been involved in several road incidents locally in recent weeks.
Talented Wicklow Pair Shortlisted for National AIB Portrait Prize
Bray photographer Alannah Henry and Donard-based teenage artist Isla Case were named among a combined 46 shortlisted entries, selected from hundreds of submissions from across the country
Wicklow Rose Ready To Bloom On TV Screens Tonight
Carolann McDonald will appear in tonight's second Rose of Tralee live show.
'Nothing Is Off The Table' - Wicklow TD Outlines Concerns Over Planned Fuel Excise Increases
Concern Grows For Missing 53-year-old
Sean Gaughan has now been missing for two weeks
8:00pm - 10:00pm
Love Songs on the Coast
Light rain shower
High: 20°C | Low: 12°C
Light rain shower
High: 20°C | Low: 13°C
Light rain shower
High: 20°C | Low: 12°C
Light rain shower
High: 19°C | Low: 11°C
Light rain shower
High: 20°C | Low: 12°C