20240843 Ver 1_Diffuse flow narrative_061724_20240618

Wetlands and Environmental Planning Group
Leonard S. Rindner, PLLC.
June 17, 2024
Re: Redhawk Buffer Reauest — Diffuse Flow Narratives Provided by Proiect Eneineers:
The following engineering and design considerations will be implemented to ensure that the proposed
project will not generate concentrated stormwater flow through the buffer:
• Efforts were made during the design of the residential marina parking lot and lake access to
reduce long term channelized flow into the 50' riparian buffer. For both the entrance road and
the parking lot, the curb is 1' ribbon curb which carries the same cross slope as the road. The
intent is for water to sheet flow off the road.
• The road has a 2% cross slope, as does the ribbon curb, the planting strip, and the sidewalk so
that no water is channelized, eliminating the need for catch basins in the parking lot or for the
entrance road.
• The drainage area is being reduced to an existing ephemeral channel adjacent to the existing
pump station that outfalls 50' from the start of the 20' Zone 2 No Build buffer.
• Coconut fiber matting and rock check dams will be utilized to reduce velocities in the channel
during construction.
• Design calculations show 7 US in the channel during the 10-year storm event, which is less than
it is currently carrying, therefore reducing flows during storm events.
• Per GNRD requirements, we will be revegetating any disturbed ground with a native seed mix.
Thank you for your consideration of these materials and please contact me if you have any questions,
[phone] or email at [e-mail].
Sincerely,
9(
Jeff Levi,
Biologist
Charlotte Office: www.wetiands-epg.com
10612-D Providence Rd.
PMB 550
Charlotte, NC 28277
[phone]
[e-mail] 1
Len Rindner, PWS
Principal
Asheville Office:
1070 Tunnel Rd., Bldg. I
Suite 10, PMB 283
Asheville, NC 28805