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Dhengr… I think you and I are on the same page here. Before you posted I was digging into this (figuratively) some more, and it seemed like the rock trenches were the way to go. The rock base being on a slope limits its capacity, so the rock trenches can make up for that lost capacity. I only...

Aqua, that is a good idea. Unfortunately, the steep part of the driveway is at the bottom. Yes, if it was up higher I could build in additional storage depth in the lower, flatter area and simply let the runoff flow from the upper to the lower area. That would work. But I can’t apply that here...

Beej67, Yes, I could go with impervious pavement for the steep part of the driveway. But then I'd have to treat the runoff from that area somehow. That means installing some other type of system. In that case we'd now have two kinds of systems to maintain. So that's why I'm trying to go with...

Ron, you are correct. This is why permeable pavement requires ongoing maintenance, mainly periodic vacuuming of the paved surface to keep fines and other small debris to a minimum. In the research I've done it's been noted that many of these installations eventually fail (from getting completely...

I’m in Southern California and working on a single family residential project with a fairly long driveway (600 feet) from the main road to the house. The project is required to provide water quality treatment. Instead of putting in typical impervious pavement for the driveway, I’m using a...

Hey foley7, I'm not sure I completely understand the issue as you describe it. I have some questions: 1. I'm not clear on what you mean by a -0.2% grade. Is this the longitudinal grade along the road centerline profile? Or something else? Does the negative number just mean that it is falling...

I want to thank everyone so far for weighing in with their questions and suggestions regarding this problem. There are many solutions being considered, and the final one may end up being a combination of two or more of these. I thought I'd update everyone with some more clarifications and where...

Hey all, I appreciate the ideas and comments everyone is posting. I think I should clarify what the current street cross section looks like. This road is designed with three lanes and a bike lane (41’ curb to curb) in the south (uphill) direction, and two lanes and a bike lane (29’ curb to...

Hey everybody, Thanks for the suggestions so far. Ryb01, I haven't actually calculated the amount of water, but I think it is fairly significant. This is a very long and steep road and there are several curb inlets upstream of the "problem area", but (as I described earlier) most of the...

I've been asked to look at some drainage problems on an existing fairly long and steep street (10% grade). It was designed with a 2% crown. It is a heavily traveled street with two or three lanes in each direction. The issue is that during heavy rains there is a lot of water on the pavement...

sbw, You need to tell your client that the term "flatwork" should not be taken literally. OK, bad joke. Seriously, though, I agree wholeheartedly with TGLG in that codes are written to (among other things) provide some factor of safety in construction. We don't live in a perfect world and...