Hi everyone. I'm going to have gutters installed soon and I'll be following that up by installing underground drainage from the downspouts on the back of my house to direct this runoff into my front yard near the street. On the back of the house there will be four 4" downspouts. I plan to run two of the downspouts into one 6" pipe, and the other two downspouts into another 6" pipe (SDR 35). I'll run these along the sides of the house into the front yard. My math for pipe size gallons/minute, roof size and pitch, and historical rainfall for my area tells me that this should be fine.
However, I'm stumped on a detail of daylighting these two 6" drains on each side of my house. My city doesn't allow connecting to the city storm sewer (or boring through the curb into the street) so I will need to daylight into my yard. My house is on a hill, from the back of the house to the front, so I have plenty of slope: once the water hits my yard, it doesn't have far to go until it hits the street. But during the summer storm season in Florida, this will be a torrent of water focused on a small part of my yard and I'm worried about erosion. I'm thinking that I should split the flow from each 6" pipe into two 4" pipes and separate them in my yard by several feet to reduce the risk of erosion. Also, I want to daylight these drains using a mitered grate this like: Mitered Drain 4 in. Green Angled Mitered Drainage Grate - - Amazon.com which is only available for 4" pipes.
My question is, is splitting the flow like this a good idea? And if it is, how best can I split the flow across each pipe 50/50? What fitting(s) should I use? A wye and a tee both seem inappropriate. Should I use a distribution box like in a septic system? Any other advice?
Thanks in advance!
However, I'm stumped on a detail of daylighting these two 6" drains on each side of my house. My city doesn't allow connecting to the city storm sewer (or boring through the curb into the street) so I will need to daylight into my yard. My house is on a hill, from the back of the house to the front, so I have plenty of slope: once the water hits my yard, it doesn't have far to go until it hits the street. But during the summer storm season in Florida, this will be a torrent of water focused on a small part of my yard and I'm worried about erosion. I'm thinking that I should split the flow from each 6" pipe into two 4" pipes and separate them in my yard by several feet to reduce the risk of erosion. Also, I want to daylight these drains using a mitered grate this like: Mitered Drain 4 in. Green Angled Mitered Drainage Grate - - Amazon.com which is only available for 4" pipes.
My question is, is splitting the flow like this a good idea? And if it is, how best can I split the flow across each pipe 50/50? What fitting(s) should I use? A wye and a tee both seem inappropriate. Should I use a distribution box like in a septic system? Any other advice?
Thanks in advance!
