20020468 Ver 1_Stormwater Info_20020626

Environmental Consultants, PA
Road • Raleigh, North Carolina 27614 • Phone: [phone] • Fax: [phone]
June 26, 2002
NCDENR - D WQ
Parkview Building
2321 Crabtree Boulevard, Ste. 250
Raleigh, North Carolina 27604
Attn: Mr. John Dorney
RE: Stormwater Management Plan
Brier Creek Golf Community (Country Club) ,. F
Land Bay J/M - Phase 15 :J ` 2 s 1
Raleigh, Wake County, North Carolina
S&EC Project #: 97-3034
DWQ #: 02-0468 K` ouN ?,ti.,
Dear Mr. Dorney:
Attached are the stormwater management plan and calculations for the velocity
dissipators shown on the plan for the Land Bay J/M project as requested in the 401 Water
Quality Certification and Neuse River Buffer Rules approval. The plan has been
designed by the John R. McAdams Company to direct stormwater to diffuse flow at non-
erosive velocities through the riparian buffers.
If you have any questions, please feel free to call me at 846-5900 or Jon Moore of the
John R. McAdams Company directly at 361-5000.
Sincerely,
Jennifer A. Burdette
Environmental Scientist
Attachments
c: Lee Honeycutt - Toll Brothers, Inc.
Jon Moore - John R. McAdams Co.
Charlotte Office: Greensboro Office: Hickory Office:
PMB 291, 3020-I Prosperity Church Road 3817-E Lawndale Drive 910 Boston Road
Charlotte, NC 28269-7197 Greensboro, NC 27455 Taylorsville, NC 28681
Phone: [phone] Phone: [phone] Phone [phone]
Fax: [phone] Fax: [phone] Fax: [phone]
06/04/2002 TUE 12:50 FAX [phone] JOHN R MCADAMS
Tot-99110, FES 1 & 11
NRCD Land Quality Section
Pipe Design
Entering the following values will provide you with
the expected outlet velocity and depth of flow in a
pipe, assuming the Mannings roughness number is
constant over the entire length of the pipe.
10-year storm
flow Q in cfs : 48.34 Flow depth (ft) = 1.09
slope S in % : 6.52 Outlet velocity (fps) = 20.744
pipe diameter D in in.: 36
Manning number n : 0.013
NRCD Land Quality Section
NYDOT DIssipator Design Results
Pipe diameter (ft) 3.0
Outlet velocity (fps) 20.744
Apron length (ft) 36.0
AVG DIAM STONE THICKNESS
(inches) CLASS (inches)
3 A 9
6 B 22
13 B or 1 22
23 2 27 o
CALCULATIONS:
Free Flow Condilium:
Width ^ La i Do
= 36 + 3.0
39.0 ft.
USE 39 ft
05/14/02
SUMMARY:
NCDOT Class '2' Rip Rap
36 ft. L x 39 ft. W x 27" Thk
?fOMOjtqE-P f ENt,?V'D -PA-I--')
Z002/006
( ?,,- 6, 14-, o -z,
06/04/2002 TUE 12:50 FAX [phone] JOHN R MCADAMS
Tot-99110, FES 1
NRCD Land Quality Section
Pine Desivn
Entering the following values will provide you with
the expected outlet velocity and depth of flow in a
pipe, assuming the Mannings roughness number is
constant over the entire length of the pipe.
10-year storm
flow Q in Cfs : 19.10
slope Sin % : 6.52
pipe diameter 0 in In.: 30
Manning number n : 0.013
.Pow depth (ft) = 0.72
Outlet velocity (fps) = 16.233
NRCD Land Quality Section
NYDOT Dissioator Desion Results
Pipe diameter (ft) 2.5
Outlet velocity (fps) 16.23
Apron length (ft) 25.0
AVG DiAM STONE THICKNESS
(inches) CLASS (inches)
3 A 9
6 B 22
13 B or 1 22
H 23 2 27o
CALCULATIONS:
Free Flow Conditions: ..
Width = La +Do
=25+2,5
27.5
USE 28 ft
SUMMARY:
NCOOT Class ' 'Rip Rap
25 ft. L x 28 ft, x 27" Thk
05?14ro2
0003/006
w, :7 0 wT e - WC U-VE Coll &NCP
ETNA ) ?5 F-If'PW
T S ? {
' AV K111-4
06/04/2002 TUE 12:51 FAX [phone] JOHN R MCADAMS
TOL-99110, FES 11
NRCD Land Quality Section
Pine Desion
Ente ing the following values will provide you with
the expected outlet velocity and depth of flow in a
pipe, assuming the Mannings roughness number is
constant over the entire length of the pipe.
10-year storm
flow Q in cfs : 29.24
slope S in % : 1.50
pipe diameter D in in_ : 36
Manning number n., 0.013
Flow depth (ft) = 1.24
Outlet velocity (fps) = 10.600
NRCD Land Quality Section
NCDOT Dissinstor Desion Results
Pipe diameter (ft) 3.0
Outlet velocity (fps) 10.60
Apron length (ft) 24.0
AVG DIAM STONE
(inches) CLASS
------------ - - - -------
3 A
6 B
b13 Bor1
23 2
CALCU ATIONS.
Free Flow Conditions:
Width = La +Do
=24+3.0
=27 )t.
USE 27ft
THICKNESS
(inches)
9
22
22
27
U004/006
12/09101
SUMMARY:
NCDOT Class ' 'Rip Rap
24 ft. L x 27 ft x 27" Thk

06/04/2002 TUE 12:51 FAX [phone] JOHN R MCADAMS
TOL-99110, FES 35
NRCD Land Quality Section
Pipe Design
Entering the following values will provide you with
the expected outlet velocity and depth of flow in a
pipe, assuming the Mannings roughness number is
constant over the entire length of the pipe.
10-year storm
flow Q in cfs : 13.62 Flow depth (ft) = 0.60
slope Sin % : 3.11 Outlet velocity (fps) = 17.338
pipe diameter D in in.: 24
Manning number n : 0.013
NRCD Land Quality Section
NYDOT Dissiaator Design Results
Pipe diameter (ft) 2.0
Outlet velocity (fps) 17.34
Apron length (ft) 20.00
AVG D1AM STONE THICKNESS
(inches) CLASS (inches)
---------- ---- --
3 A 9
6 8 22
13 8 or 1 22
23 2 27?(
CALCULATIONS.
Free Flow Conditions:
Width = La +Do
= 20 +2.0
22 ft-
USE 22 ft
12109/01
SUMMARY:
NCDOT Class '2' Rip Rap
20 ff. L x 22 ft. W x 27" Thk
U005/006
06/04/2002 TUE 12:51 FAX [phone] JOHN R MCADAMS
TOL-99110, FES 47
NRCD Land Quality Section
Pipe Design
Entering the following values will provide you with
the expected outlet velocity and depth of flow in a
pipe, assuming the Mannings roughness number is
constant over the entire length of the pipe.
10-year storm
flow Q in cfs : 21.79 Flow depth (ft) = 0.62
slope S in %: 7.57 Outlet velocity (fps) = 18.063
pipe diameter Din in.: 24
Manning number n : 0.013
NRCD Land Quality Section
NYDOT Dissioator Desion Results
Pipe diameter (ft) 2.0
Outlet velocity (fps) 18.06
Apron length (ft) 20.00
AVG DIAM STONE THICKNESS
(inches) CLASS (inches)
---- - - - - - ----------
3 A
9
6 B 22
13 B or 1 22
23 2 27 o
CALCULATIONS:
Free Flow Conditions:
Width = La +Do
=20+2.0
= 22 fr.
USE 22 ft.
12/09/01
SUMMARY:
NCDOT Class 2 Rip Rap
12 ft. L x 22 ft. W x 27" Thk
U006/006