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why do you need a continuing trench all the way around
how much water comes in and from where
a french drain is a fancy name for a hole in the ground with a cover
if the water table is low it is dry but if there is a high water table
or the subsoil is clay it may not drain or even come up from your hole/trench
so why not a sump and pump
or just drill holes every so far if the water will just run out
or little basins every so far apart if large amounts of water comes in quickly
it looks to me like you need to stop the water from getting in if you can first
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