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Barrier Scupper

Question
State	WI
Description Text	Dear MwRSF, Could you take a look at these drawings. I’m not quite familiar interpreting the chart that LRFD manual on snag. I found it hard to believe that opening did on influence the roll over (see FHWA letter). _____________________________________________ Subject: Barrier Scupper Please see attached details for US 41 typical cross section for the Duck Creek to Lineville mainline. Barrier will be placed along the median and the outside adjacent to the existing frontage roads. We are proposing scuppers to be placed as curb flankers at the sag curves along the outside barriers. We would be proposing one scupper about 30 to 50 feet upstream from the low points. Therefore, there would be four scuppers at each low point. The scuppers are being proposed as a “failsafe” measure to drain storm water in case the roadway inlets at the sag condition get clogged or can’t drain out. Inlets and storm sewer is designed for the barrier-contained roadway. We do not plan to add scuppers along the continuous grade upstream of the sags. We would ideally be looking at a 4-inch x 18” scupper at the base of the 42-inch SSCB. Due to construction means and methods, we could consider a 3” high scupper x say 24” length. We do not believe the 3-inch or 4-inch scupper height introduce a snagging issue. Please advise if you have any concerns or require further justification. We are trying to include with the February 1 PS & E. Thanks for your attention. I look forward to hearing from you.

Question

State

Description Text

Dear MwRSF, Could you take a look at these drawings. I’m not quite familiar interpreting the chart that LRFD manual on snag. I found it hard to believe that opening did on influence the roll over (see FHWA letter). _____________________________________________ Subject: Barrier Scupper Please see attached details for US 41 typical cross section for the Duck Creek to Lineville mainline. Barrier will be placed along the median and the outside adjacent to the existing frontage roads. We are proposing scuppers to be placed as curb flankers at the sag curves along the outside barriers. We would be proposing one scupper about 30 to 50 feet upstream from the low points. Therefore, there would be four scuppers at each low point. The scuppers are being proposed as a “failsafe” measure to drain storm water in case the roadway inlets at the sag condition get clogged or can’t drain out. Inlets and storm sewer is designed for the barrier-contained roadway. We do not plan to add scuppers along the continuous grade upstream of the sags. We would ideally be looking at a 4-inch x 18” scupper at the base of the 42-inch SSCB. Due to construction means and methods, we could consider a 3” high scupper x say 24” length. We do not believe the 3-inch or 4-inch scupper height introduce a snagging issue. Please advise if you have any concerns or require further justification. We are trying to include with the February 1 PS & E. Thanks for your attention. I look forward to hearing from you.

System Performance Evaluation

System Types
Permanent Concrete Barriers

Applications

System Features

Date January 30, 2013
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Attachment 405160-30-ProjectSummary.pdf Attachment b218.pdf Attachment scupper detail.pdf Attachment Typical Section.pdf

Response
Response (active)	From Pooled Fund Consulting Summary Nos. 228, 263, and 439, it would appear that your hole heights of 3 or 4 in. would fall below our recommended upper bounds. As such, concerns related with wheel interaction with hole would likely be very limited. Ron

Response

Response
(active)

From Pooled Fund Consulting Summary Nos. 228, 263, and 439, it would appear that your hole heights of 3 or 4 in. would fall below our recommended upper bounds. As such, concerns related with wheel interaction with hole would likely be very limited.

Ron

Date January 31, 2013
Previous Views (99) Favorites (0)