Request for clarification

Riddle, Rick L
From:Randall, Mike
Sent:Friday, February 13, 2015 9:50 AM
To:'Tristan McMannis'
Subject:Request for clarification
Attachments:SW3150202 Wet Pond Checklist & Calculations.doc
Tristan

Pursuant to 15A NCAC 02H .1008 (e)(2) The discharge rate …… shall be such that the draw down to the permanent
pool level occurs within five days, but not in less than two days. Please check your calculations. I came up with
about a 6 hour draw down. The 8 inch diameter orifice is larger than I normally see.

My calculations:

Discharge Rate = Coda \[2 g Ho\] ^ 0.5
For a 8.0 inch diameter orifice
r = 4.0 inches/12 inches/ft. = 0.333 ft.
2 2
A = 3.14 r= 3.14 (0.333) = 0.348 so
Cd = 0.6
g = 32.2
Ho = (Temporary Pool Elevation-Permanent Pool Elevation) / 3 = (593.20-590.50)/3 = 2.7
Discharge Rate = 0.6 (0.348) \[(64.4) (2.7)\] ^ 0.5 = 2.753 cuffs
3
Water Quality Treatment Volume Provided: 58,539 ft
33
(58,539 ft/2.7 ft/sec) / 86,200 seconds/day =0.25 days

Also, although not required by DENR rules, in order to function properly DENR recommends the permanent pool
elevation be within 6 inches (plus or minus) of the SHWT elevation. Can you confirm the SHWT is within 6 inches of the
Permanent Pool Elevation (590.50)? Otherwise you may end up lining the pond which can be expensive.

Mike Randall
Stormwater Permitting Program
NC Division of Energy, Mineral and Land Resources (DEMLR)
1617 Mail Service Center
Raleigh, NC 27699-1617

Office: 919-807-6374
Cell: 919-389-7801

Email correspondence to and from this address may be subject to public records laws

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From: Tristan McMannis \[mailto:[e-mail]\]
Sent: Wednesday, February 11, 2015 5:24 PM
To: Randall, Mike
Subject: Deeds for Amber Meadow

Hi Mike,

We sent the Amber Meadow subdivision in for review the other day, and in the transmittal I mentioned the deeds would
be sent under separate cover with the Joinder agreement. Attached you will find PDFs of the deeds, and the joinder
agreements from Longview South. Let me know if you have any questions or require any additional information. Thanks
for your time.

Best regards,

Tristan McMannis, RLA, ASLA, LEED® AP BD+C

engineering · surveying · planning

3475 Lakemont Blvd.
Fort Mill, SC 29708
www.espassociates.com
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