One lesson from all the recent rain is that a lot of flooding was caused by storm water running into the house, typically through the garage, after passing over a drain grill like this one.
I suspect a lot of occupants don't realise these grills contain a downpipe to take away flood water, just like the downpipes from your gutter.
The second photograph shows that downpipe. If that isn't kept clear, then it won't take much to fill the trench and then water will enter your garage. Equally important, when it's raining heavily the flood water can sweep mud or leaves over the grill and block it so water floods straight into the garage.
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