20140350 Ver 1_More Info Received_20140502

Strickland, Bev
From: Lovinggood, Ray D
Sent: Friday, May 02, 2014 11:05 AM
To: Herndon, Mason
Cc: Rivenbark, Chris; Cashin, Gordon E; Lauffer, Matthew S
Subject: U -33388 Treatment of Rainwater Runoff
Mason,
During the design for U- 333813, we incorporated stormwater BMP's wherever practicable. Several grass swales are used
in the project as is avoidance and minimization. In the area from Market Street down to Emerson Street (almost to
Randall Pkwy), there were no options available for any BMP's due to the current build -out of the urban environment.
You asked why we didn't consider purchasing any of the forested land that is bounded by Kerr, Randall, Emerson, and the
concrete drainage canal and using it for some type of BMP. The reason is the water coming from Market can't get to the
forested area. The unnamed stream that passes under Kerr intercepts the water coming down Kerr in the storm drainage
system and there is no possible way to keep the two separate and send the storm water to the forested area.
As for minimization, take a look at Randall Parkway, Sta 13 +50 Rt + / -. There, we put the stormwater in a pipe rather than
a ditch, as it is now. A ditch would have had a greater impact on the wetland. Further east on Randall, on the opposite
side of Kerr, we maintained an open conveyance for the non - jurisdictional drainage feature rather than piping it for its
entire length along Randall.
Mason, if you have any additional questions, please contact us. Next week, I will be out of the office, but you can talk
with Matt Lauffer. His number is 919.707.6733.
Ray D. Lovinggood, P.E.
North Carolina Department of Transportation
Hydraulics Unit
Raleigh, NC
Direct Line: 919.707.6736
General Line: 919.707.6700
Fax: [phone]
Physical Location:
1020 Birch Ridge Drive
Raleigh, NC 27610
Mailing Address
NCDOT Hydraulics Unit
1590 Mail Service Center
Raleigh, NC 27699 -1590
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