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Thank you all for your input. I'm sorry for not responding sooner--it's been a rough couple of weeks. This is great information. I think I did a poor job of describing my proposed system earlier - my infiltration bed will outlet into a manhole (the 24" perforated HDPE pipes in the bed will...

I'm designing an outlet structure for an underground infiltration bed. The bed consists of perforated HDPE pipes in gravel. The pipes will tie into a precast manhole that will outlet larger storm events. The outlet pipe will be a 15" diameter RCP that connects to the city sewer. I calculated...

Thanks, Steve! Actually, the local code states that the bottom of beds need to be sloped at 1%. I'm glad you brought up the concentration issue (I am pretty green with this type of design). Is that a common problem with infiltration beds and trenches? Double-ring tests indicate that we...

Thanks, all good advice. I will definitely run the design past the landscaper. In the meantime, I've been thinking about this a lot--My bed is going to be roughly 70' long by 10' wide by about 4' deep. (We need to fully infiltrate a 25 yr storm). The bottom of the bed will be sloped at...

Thanks for the response! Okay, here's another question, since I'm pretty green at this: Is there a rule of thumb for distancing infiltration beds away from trees? There is a line of mature trees near the intended location of the bed. They appear to be a combination of maples (silver maples, I...

I'm designing an infiltration bed to take roof drains for a new house. I'm fairly green with this process. The bed will consist of perforated pipes in a gravel bed wrapped in geotextile. If some of you could provide tips on potential pitfalls, I would greatly appreciate it. (aside from the...