First on the culvert. Your only recourse here (and it may be too late) was to sue the person you purchased the property from as well as the realtor who handled the sale. The existence of the culvert was a material item that should have been revealed before purchase.
I'm not sure about how it works in Canada, but most governments have the ability to take an easement on private land for such things. I would think they are responsible for maintaining the culvert, but not the result of the run off.
On the development, you would appear to have a case (were there hearings about allowing the construction of the drainage?) against the developer. But to exercise your rights you need to fight it in court. Maybe you can see if the ditch violated some environmental laws and obtain a court order based on that.
The only other thing I can think of is to dig your own drainage to try and funnel the water off your property into a sump or similar. Or at least a far corner of your property.
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