"George" wrote in message
...

"PrecisionMachinisT" wrote in message
...

In fact, many municipalitys are now requiring a "grassy swale area" in
order
that any oily runoff from parking lots, subdivisions, and other such
largely
paved-over areas be allowed time in order to bio-process before the
water
leaches back into the soil in recharging the local aquifer.


Well, no. Mostly that's to allow the runoff from storms to get into the
ground rather than the sewers. You get fined for excessive flow of
untreated sewage from your plant, and a storm overloads the system fast.


These all flow into a simple french drain...

If it weren't for the presence of contaminants then what need for the gently
sloped grassy swale???

Might as well just line a trough with concrete....

--

SVL