Hi Norm,
Ok thanks for that ,the casting cement sounds like it must be strong and is cheap enough.
Looks like you have that garage sorted with a few alternate systems in place if one system fails.
It's only flooded here once in over 30 years ,the rain was so heavy it washed all the stones down the drive and blocked all the drains ,I managed to unblock the drains but the water still
couldn't drain away quick enough. Usually even if the water doesn't drain away quick enough
it just washes down the backyard but because the lay of the land was changed by all the
stones washing down from the torrent of water it just started to bank up.
Cheers
Max.