septic is a good guess, but taking bruce's wording literally, he says the owner "had to try something that was "engineered".....sounds like it still doesnt work and was attempted after the house (and septic) was already in.
my final guess is he wanted two small shallow ponds next to his house...koi or forage pond thingies......
if thats not it, i'm stumped.
i'm pooped.
i'm going to bed and will check back in the a.m.
good luck everbody.
