How to merge gutters and have water flow away from house and patio
by
SEL
we have a flat roof and the patio canales are a downpour when it rains. would like to create a flow into the grass, but the distance is approx 10' away. thanks for your advise.
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You can dig a trench from the downspouts adding underground drains using a 90 degree angle pipe at the downspout that covers it, and then PVC pipe joined that goes into the trench. Once past the patio you could then drill some holes into the bottom of the pipe facing on the downside in the trench to allow it to percolate into the soil. I have these and never had a problem with them. Now it seems they use the French Drain pipe which looks good too if you don't crush it.... https://www.youtube.com/watch?v=0UZKSLWgrWE
go to the builders yard and buy some plastic sealant to make the joints water proof and make sure there is a three % drop in the level of the gutter to the outlet waste pipe