Making a garage waterproof

[NDT]

We had 5" of rainwater runoff (and later overflowing diluted sewage) on our front drive from the heavy rain at the weekend. This has flowed into the garage, bringing a layer of silt with it as the runoff comes from a nearby field. I've seen seals like this: https://uk.garadry.com/collections/garage-door-sea...

Which would have been ok today when we had a mere 1" in the garage, but no good when it's deeper.
Neighbour is planning to build something akin to a speed hump just inside his garage door, but that sounds like a pain as I have a VX220 which is pretty low and also like to bring my scissor lift outside (which must weight about 500kg).

Anyone else faced the same issue, and what did you do?

[NDT]

PS the doors are just up and overs - so I doubt they could be made to seal effectively at the bottom.
I assume roller shutter doors are rainproof but not waterproof

[ATG]

Ugh, bad luck. Can you divert the water before it gets near the garage in the first place? E.g. a ditch or french drain at the boundary of your property?

[Zetec-S]

If it's something you can "predict" might happen, would you be able to install some sort of temporary barrier as and when you think you might need it?

Something like this, albeit a bit pricey?
https://www.aspli.com/6404/dam-easy-flood-gate-bar...

Or a cheaper option, probably less effective.
https://www.zoro.co.uk/shop/safety/site-safety-var...

[98elise]

Zetec-S said:

If it's something you can "predict" might happen, would you be able to install some sort of temporary barrier as and when you think you might need it?

Something like this, albeit a bit pricey?
https://www.aspli.com/6404/dam-easy-flood-gate-bar...

Or a cheaper option, probably less effective.
https://www.zoro.co.uk/shop/safety/site-safety-var...

It would be relatively simple to build a temporary/removable dam from timber, which screws into a permanent timber frame (sealed to the wall and floor) just inside the garage door.