Basically, the culverts should have been installed at the outset and they should have been big enough to allow enough water to flow through them. That's it, in a nutshell. The problem is that it was not done.
Is the department unable to ensure that the culverts are big enough to allow for sufficient flowthrough? There is nothing complicated about it. As a precaution, as I said earlier, the structure that is built should allow for enough water to flow through. It's elementary. And that's where the problem lies.