Delayed Paving Drainage Problems
Delayed Paving Drainage Problems
(OP)
We design many developments which are built in phases. Often the client wants to delay paving the top course of HMA until after most or all of the construction traffic has stopped. It can sometimes be upwards of a year or two before the top course is finished.
Has anyone found a good way to deal with drainage problems that result from have a 1 1/2" to 2" lip at the the edge of pavement/curb interface, thereby leaving ponding and rendering on-grade basins useless?
We have tried leaving the curb-line catch basins at leveling course grade and adjusting them just prior to paving, however this gets messy, what with the pavement and curb replacement.
Any help would be appreciated.
Has anyone found a good way to deal with drainage problems that result from have a 1 1/2" to 2" lip at the the edge of pavement/curb interface, thereby leaving ponding and rendering on-grade basins useless?
We have tried leaving the curb-line catch basins at leveling course grade and adjusting them just prior to paving, however this gets messy, what with the pavement and curb replacement.
Any help would be appreciated.





RE: Delayed Paving Drainage Problems
RE: Delayed Paving Drainage Problems
RE: Delayed Paving Drainage Problems
Protection BMPs? Typically in my area, the CBs are protected with sed logs or bails to limit the sediment entering the storm sewer. This in turn creates ponding issues during construction. I have seen these BMPs in place for over a year for larger projects. Is a couple of inches of ponding that much of an issue? Where are you located? Is precip high/often? If the ponding is an issue maybe interim drainage facilities should be used, just a thought.
RE: Delayed Paving Drainage Problems
The ponding occurs at sag inlets, where the water is required to pond to the same depth as the lip before it can enter the basin.
During temporary situations such as over the winter, ponding is not such an issue. However in subdivisions with several phases, often built months or even years apart, the ponding can become quite a nuisance.
We have used the adjacent underdrain solution and have had problems with them plugging with debris and snow, so I wondered if there are any others out there, possibly proprietary.
Thanks for the help!
RE: Delayed Paving Drainage Problems
RE: Delayed Paving Drainage Problems
I find that the majority of the problems are due to bypass from the upstream catch basins or a road that is proposed to be built in a future phase uphill, which would collect and pipe runoff that the sag catch basin is not designed to handle as overland flow. The complaints we get are from homeowners who are concerned about seeing this much ponding in the street. We have had some success (temporarily) with installing washed stone logs wrapped in filter fabric and placing them on the downstream side of the 'on grade' catch basins to create a ponding effect at the upstream catch basins - But the homeowner's don't like to see this either.
I agree with Maury when he says "I haven't seen that the ponding areas you describe have a greater frequency of problems than anywhere else. The Owner has to accept this as a cost of doing business." But if this is a common problem and your concerns are about the depth of ponding maybe you could consider over-designing the sag catch basins to account for this.