Roof Drainage 1

[Rookie2]

Hi,

I was hoping someone could recommend a good economical way to pipe runoff from roof drain downspouts and tie to a storm drain system. Our particular project is a daycare with parking in front and a playground on the other 3 sides.
There are roughly 3 to 4 downspouts per side. How is this typically done? I have seen one product, ADS In-line Drain, which looks interesting. Anyone have any experience with this product? Or is there a better way? Any help would be appreciated - I have very little experience with commercial developments.

Thanks

 

[Rookie2]

Also, In your experience is this an Architechtural / Plumbing Issue (ie; is this included in the architechtural plans)? Or is this a civil / site issue?

Thanks

 

[bltseattle]

Typically roof drain leaders are connected by two 45 degree els to a buried drain pipe- ADS/Hancor smooth wall polyethylene, PVC, or concrete pipes should be okay. I do not recommend corrugated metal.

Make sure you have at least 0.5% slope on the pipes, 2% is preferred. Your connection point to the existing storm may limit your slope. You might need a catch basin where you connect up to the existing storm drain line - check with your local agency.

Regarding the in-line drain, typically you don't need a catch basin at the end of the downspout, unless you expect lots of debris from the roof to enter the system. I would make sure, however, that if you need to clean the pipe, a 100-ft snake would reach all points in the system (so add a cleanout or catch basin if needed.)

 

[bltseattle]

Architect takes the roof drains to the edge of the building, civil picks up the drains at ground level +/-

G'luck!

 

[Rookie2]

Wow that was quick! What a great resource. Thanks bltseattle, that's what I needed to know!