20130517 All Versions_R-2413A_20160718

Wrenn, Brian L
From:Lovinggood, Ray D
Sent:Monday, July 18, 2016 2:27 PM
To:Wrenn, Brian L; [e-mail]; Eason, Patty P; Lorenz, Kris;
'[e-mail]'; Wilson, Travis W.; Riffey, Deanna
Cc:Morgan, Stephen R; Shumsky, Michael J
Subject:R-2413A
All,

I am reviewing a construction change for the subject project and have three questions which are listed below the plan view
image.

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NS C. B RIPRAP
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Proposed 48' CSP
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PLANS PR,
RUMMEL, KLEPI
900 RIDGEFIELD
RALEIGH, NORTH Cd
NC LICENSE NO. F-
The 48" CSP cross pipe near —YC1- Sta 25+50 is shown as a 48" CSP, 16 Gage.
This pipe should be RCP -IV, not corrugated steel.
My questions are:
2

1. Was there a commitment to use a metal pipe at this location? Why?

2. With a slope of 7.74% and a stream slope of 5% downstream of the pipe, do we bury the pipe 20% of its diameter
and try to keep material in it? The plans call for it be buried 0.8’, but on a slope that steep, I doubt material would
stay in the pipe. To possibly keep material in the pipe, sills on both ends will be required. Also, the pipe would
need to be upsized to either a 54” or 60” to compensate for the area lost to burial of the pipe.

3. Plans show outlet protection as Cl I Riprap on the channel banks. I recommend Class I riprap also in the channel
bed, but without geotextile fabric.

Any comments?

Thanks,
Ray

Ray D. Lovinggood, P.E.

Engineer - Advanced

Hydraulics Unit

North Carolina Department of Transportation

919 707 6736 office

[e-mail]

NCDOT Hydraulics Unit
1020 Birch Ridge Drive

NCDOT Hydraulics Unit
1590 Mail Service Center

Raleigh, NC 27699-1590

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