Hi Jean,
My team and I are also working on the design challenge in saibai and have come up with an alternative solution to use duckbill valves instead of metal flap valves. The innovation aspect of it was to add drawings and paint over it making it a community event for the kids and/or adults.
We were wondering if it is culturally appropriate for the islanders to draw on the valves before implementation. If so, what kind of drawings will they likely add?
Regards,
Hazel