Hi Brendan,
The community partner didn’t raise any issues with the culverts. Therefore, the focus is only on the drainage system.
The culverts and the drainage pipes serve different purposes. The culverts allow water to move freely from one side to the other, such as natural in/outflows from the wetland to the ocean and vice versa. At the same time, the drainage pipes are designed for one-way flow to allow excess water to escape. Unfortunately, there is no data readily available on the number of pipes.
I hope that clears things up for you!
Regards,
Jean
Jean Aquinde