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french drains

Posted by mike on March 23rd, 2001 09:02 AM
In reply to French Drains and sump pumps by Mary Ann on March 22nd, 2001 09:24 AM [Go to top of thread]

hi, not an expert,but have installed 3 french drains in my life..
here's how i did it..not sure if its the right way but it has
worked well all 3 times..dig a trench from where your sump comes
through the foundation leading away from your house
follow the lay of the land..if poossible send it in a
different direction from where the lake forms after
the heavy rain..that area is obviously totally saturated
after big rains.the trench must maintain a constant pitch
going away from your house therefore the trench may have to
become deeper the farther away from your foundation you go
it doesnt have to be a huge trnch,18"-24" wide depending
on your situation..and at least 15 ft from your foundation at
the end of the trench(lowest point)dig a round hole big enough
to fit say 1/2 an old trash barrel,it must be deeper than the trench it meets(2 1/2-4 ft in depth)
drill some holes in the bottom of the trash barrel,so the water will have somewhere to
leech from.also you will need to cut a hole in the side of the barrel to meet the drain pipe(not yet)
go to your lumber yard or home depot and buy either 4in pvc or a roll of underground
plastic perforated rolled drain pipe,some weed inhibiting cloth( the stuff you put under flower
beds to prevent weeds(if you use the pvc you will need to use a drill or skillsaw to
make your own perforations)just make them only on the top of the pipe,so the water will drip
in then run towards the end.when this is done lay your pipe in the trench,check for pitch(important)
make sure you maintain at least a 1/2 in pitch for every 5 ft(so the water will run away from your house,not
back in.i ordered some crushed stone3/4 unwashed/like 10 bucks a ton/line the bottom of the trench
with some stone,lay your drain pipe in it and at the end where your
trash barrel is cut the hole in the barrel where the pipe meets the sunken barrel
fill the inside of the barrel with stone,test,dump a gallon of water in to the pipe near the foundation
and make sure it flows to the barrel,cover the pipe with the cloth(keeps silt and sand from clogging
your pipe)leftover stone on top of the pipe the length of the trench,and backfill.sounds likke alot
of work but its not bad,and you should be able to do it for under 75 bucks..good luck

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