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CERTIFICATE NO.
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10 1 KENNETH L. BONNER
CERTIFICATE NO.
•
032 4
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I CAM
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AP �F
1. Set posts and excavate a 4"x4" 2. Staple wire fencing to
trench upslope along the line the posts.
of posts.
4 "
3. Attach the filter fabric to
the wre fence and extend it
,nto tie trench.
4. Backfill and comoact the
excavated soil.
nsion of fabric and
into the trench.
yr�lllj�ly
Filter Fabric—
- --Wire
CONSTRUCTION OF A SILT FENCE
SP•
o
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T :\
1 �� ':��� I r r l •
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IN
D .OWL
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No
477
14,
DATE: May 13, 1998 SCALE: 1"=1000' FILE##: "gbc-map.dwg"
ggObert w. Clifford do associates, Inc. Grace Brethren Church SHEET
ENGINEERS - LAND PLANNERS - SURVEYORS
150-C " Grom.ich ortA 200 Noah Carneran Sbwt Drainage Map OF
FredKldcsDtn'q. Mrglnfo 22401 WIrichtt■t•r, Wginla 22M
(540) 896-2115 (W) 07-2139 1
Frederick County, Wglnla
6
I V
F
ED PICVar.-Coi.-
-
- --
----
_
-
I
Ion Yea
_
5o Yes;0.
5'CEAR -
2YEs�R --
-
-- IV 20 :30 40
5:0 6'0 --
Source: VDOT
Plate 5-11
Blue Ridge Grace Brethern Church
Evaluation of Storm Water Impacts
Proposed Increased Impervious
Areas:
111jilding Addition =
4,964
sq.ft.
Parking Lot =
23,074
sq.ft.
Additional Impervious Area =
28038
sq.ft.
Existing Conditions:
Drainage Area to 24" CMP =
33.52
Acres
Assumed Land Cover Conditions =
3%
Existing Impervious Area =
1.01
Acres at C =
0.9 CA = 0.90
Existing Pervious Area =
32.51
Acres at C =
0.15 CA = 4.88
Total CA = 5.78
Drainage Area High Point =
905.00
Drainage Area Low Point =
799.00
Length =
3050
ft.
Time of Concentration =
14
min. (per Kirpich)
Ten Year Storm Intensity =
4.8
in/hr
Ten Year Peak Flow =
27.75
cfs
Hw/d at Existing Culvert =
2.80
Headwater Depth =
5.60
ft.
Proposed Conditions:
Drainage Area to 24" CMP =
33.52
Acres
Existing Impervious Area =
1.65
Acres at C =
0.9 CA = 1.48
Existing Pervious Area =
31.87
Acres at C =
0.15 CA = 4.78
Total CA = 6.26
Ten Year Peak Flow =
30.07
cfs
Hw/d at Existing Culvert =
3.20
Headwater Depth =
6.40
ft.
Increased Ten Year Peak Flow =
2.32
cfs
24" CMP Capacity:
At Headwater Depth =
6.40
ft.
Energy Grade Line Slope =
6.1 %
at tailwater = 1.5 ft.
Use Manning's n =
0.023
Area =
3.14
sq.ft.
WP =
6.28
ft.
Full Capacity =
31.66
ft.
Gilbert W. Clifford and Associates
200 North Cameron Street
Winchester, Virginia) 22601
540-667-2139
H (FT.)
500
400
330
EXAMPLE
Height = 100 Ft.
H
200
Length = 31000 Ft.
,.
Time of concentration =14 Min.
�
150
�
0
W
�
\ ��X4 MSC
I
50
E
It-
2
40
'
J
C
C.
3 0
W
a
W
Note:
c=
0
20
Use nomograph Tc for natural
2
basins with well defined channels,
p
w
a:
for overland flow an bar•
`10
earth,and for mowed qlem road-
iss_.,
Rn
side channels.
2
For overland flow grassed wr-
Wi
faces, multiply Tc by 2.
'1
'O
5
For overland flow, concrete or
=
~
4
asphalt surfaces, multiply Tc
by 0.4.
x
=
3
For concrete channels, multiply
Tc by O.Z.
2
9ased an study by P.Z. Kiraiett,
C, we, EnQln••r(ngNi'Vol. 10, No. 6, June 1940, C. 362
13 May 1998
L (FT.)
- 10,000
5,000
3000
2,000
1,500
1,000
*•*7
300
200
15 Ci
1Cv
CHART 5
180
10,000
i168
T6,000
d,000
EXAMPLE
l
1156
0• 39 eeeltes (3.0 less)
6.
5.000
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(3)
144
I
4,000
s
5•
6.
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3,000
C (feet)
S.
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4•
I 108
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To gee Nieces (il cr (31 statical
21
4
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.6
a e.e a sues., or ro.tre. n
6
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- 12
HEADWATER DEPTH
FOR
C. IIA.
PIP; CULVERTS
WITH
:NI-cT CONTROL
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10'
80
60
50
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30
25
20
15
l`
10
8
6
5
4
3
.2
TIME -OF CONCENTRATION OF SMALL
DRAINAGE BASINS
1 14
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«KENNETH L. BONNER a-R
CERTIFICATE NO.
6 0327A A
X
-17
A.
tL
I. .
THESE DRAWINGS ARE PROTECTED
UNDER THE COMMON COPYRIGHT LAW
OF THE U S . AND MAY NOT BE USED IN
ANY MANNER WHATSOEVER WITHOUT
THE EXPRESSED WRITTEN PERMISSION
OF THE ARCHITECT
REVISIONS
NO
DATE
BY
ISSUE DATE
DRAWN BY
CHECKED BY
SCALE
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1. Set posts and excavate a 4"x4"
trench upslope along the line
of posts.
J
4"
3. Attach the filter fabric to
the wire fence and extend it
,nto tne trend.
17�
T'-
71,
KENNETH L. BONNER
CERTIFICATE NO.
03274
M m-0-Ty,
a-04
y km *,,D -6 P, s �
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2. Staple wire fencing to
the posts.
4. Backfi" and compact the
excavated soi!.
Nwl
nsion of fabric and
into the trench.
Filter Fabric -
CONSTRUCTION OF A SILT FENCE
ti
r
Ql-
If, Ike
00
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O,
7
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13
DATE: May 13, 1998 SCALE: 1"=1000' FILE#: "gbc-map.dwg"
gibert w. ctifford do associates, inc. Grace Brethren Church SHEET
ENGINEERS - LAND PLANNERS - SURVEYORS
1�-C OW. Giew-•�, � 200 Nartfl ��n s1� Drainage Map of
Fredwidameurq, Virginia 22401 Winchester, Virginia 225M
(540) e96-21,5 (W) 667-2139 1
Frederick County Yirglnlo
F E D f� I C 1C -COe
-GQ. too. :5 4-:,
8-
'IN
_
Y--AR,
D'f-'7ATiCN -N11N• - -- -
O 10 2'0 30 40 = 5 0 6, 0
Source: VDOT Plate 5-11
ZA-)
Blue Ridge Grace Brethern Church
Evaluation of Storm Water Impacts
Proposed Increased Impervious
Areas:
Building Addition =
4,964
sq.ft.
Parking Lot =
23,074
sq.ft.
Additional Impervious Area =
28038
sq.ft.
Existing Conditions:
Drainage Area to 24" CMP =
33.52
Acres
Assumed Land Cover Conditions =
3%
Existing Impervious Area =
1.01
Acres at C =
0.9 CA = 0.90
Existing Pervious Area =
32.51
Acres at C =
0.15 CA = 4.88
Total CA = 5.78
Drainage Area High Point =
905.00
Drainage Area Low Point =
799.00
Length =
3050
ft.
Time of Concentration =
14
min. (per Kirpich)
Ten Year Storm Intensity =
4.8
in/hr
Ten Year Peak Flow =
27.75
cfs
Hw/d at Existing Culvert =
2.80
Headwater Depth =
5.60
ft.
Proposed Conditions:
Drainage Area to 24" CMP =
33.52
Acres
Existing Impervious Area =
1.65
Acres at C =
0.9 CA = 1.48
Existing Pervious Area =
31.87
Acres at C =
0.15 CA = 4.78
Total CA = 6.26
Ten Year Peak Flow =
30.07
cfs
Hw/d at Existing Culvert =
3.20
Headwater Depth =
6.40
ft.
Increased Ten Year Peak Flow =
2.32
cfs
24" CMP Capacity:
At Headwater Depth =
6.40
ft.
Energy Grade Line Slope =
6.1 %
at tailwater = 1.5 ft.
Use Manning's n =
0.023
Area =
3.14
sq.ft.
WP =
6.28
ft.
Full Capacity =
31.66
ft.
Gilbert W. Clifford and Associates
200 North Cameron Street
Winchester, Virginia 22601
540-667-2139
H (FT.)
500
400
300
EXAMPLE
Height = 100 Ft.
r~-
200
Length = 31000 Ft.
•�
150
Time of concentration =14 Min.
F-
O
0
W
` _EX4 M��
C
50
E
1-
z
4 0
-1
0
o>,
3 0
t�.t
a
Note:
a;
M-
0
20
Use nomograph Tc for natural
t~
basins with well defined channels,
U.
-
for overland flow on bar•
IQ
scrth,and for mowea grass mod_
F=ee
to
side channels.
For overland flow grassed wr-
tZ
U
faces% multiply Tc by 2.
C
5
For overland flow, concrete or
=
=
4
asphalt surfaces, multiply Tc
by 0.4 .
x
=
3
For concrete channels, multiply
Te by 0.2.
2
Sased on study by P.Z. Kiralcril
C, -i EnQlnearing. Val. 10, No.6, June 1940, o- 362
13 May 1998
L (FT.)
- 10,000
5,000
3000
2,000
1,500
1,000
500
300
200
150
I C 0.
Tc (M i
20
15t
z
O
a
z
W
U_
O
W
H
IQr
80
60
50
4C
30
25
20
15
2
TIME 'OF CONCENTRATION OF SMALL
DRAINAGE BASINS
1 1
CHART 5
1eo
10,000
168
T
8,000 EXAMPLE Ct,
180
6,000 0.39 iwci.ee (3.0 tool) �2)
6•
5,000 Cl.66 Cf•
MM Mf
132
3,000 0 (feel)
S.
6.
(1) 1.4 s.s 4.
--
t 120
1
60
7 2,000 (21 2.1 6.3
S.
�
RI !.2 fi.6
4.
;0e
l
e0 3•
4.
J
in feat
96
a
- 1,000
3-
OSuJ,
800
3.
vs Ex►STtiJ�
64
e~i
600
72
400
L
C
300 o
3
-
1.5
s
1
(
rO
v
200
cc
iO
L54
W
100 /
cc
fy
4(1
a
eon o
7
=
60
0 1.0
5
1.0
1
I
cL
1.0
1 1` 30 Hyi ENTRANCE cr
r 36 SCALE
0 TYPE
9
: a
I �
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c
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20 n✓ M....a1 0 .e
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to ele•e _
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p 27 10
.7
=
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.T
6
S to ne %calf (2) a (3) .,.,.ef
21
4 eerll.e.f.euf 1• scale (1). Mee
.6
was sirelpl ,•ellwe. line Il1re.Ib
.6
3 0 end a •eelee• of reverse as
6
- 19
;ll.elrele..
2
1.0
L .5
,-
- 12
HEADWATER DEPTH
FOR
C. M. PIP` CULVERTS
WITH :NI_ET CONTROL
C � z C T-4 a; to ^-)
Wr�1'EP. ,1GCNROVT
,
f i
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