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Weir Report
Hydmflow F�mss FxMnsbn far Aubdesk®AutoCAO®CIv113D®by Autodesk, Inc. Wednesday, Aug 132014
SWM-1 Sediment Forebay
Trapezoidal Weir Highlighted
Crest = Sharp Depth (ft) = 1.85
Bottom Length (ft) = 14.00 Q M) = 131.26
Total Depth (ft) = 2.00 Area (scift) as 32.74
Side Slope (z:1) = 2.00 Velocity (ft/s) = 4.01
Top Width (ft) as 21.40
Calculations
Weir Coeff. Gvv = 3.10
Compute by: Known Q
Known Q (cfs) = 131.26*
Depth (ft) SWM-1 Sediment Forebay Depth (ft)
3.00
3.00
2.00
2.00
1.00
1.00
0.00
0.00
-1.00
0
- Weir
5 10
- W.S.
-1.00
15 20 25 30 35 40
Length (ft)
* 10-Year flow rate of 131.26 cfs from Hydrologic and Hydraulic calculations for SWM-1.
SWM1 SEDIMENT FORBAY SPILLWAY
NOT TO SCALE
Embankment Elev.=
2
100 Yr. Elev=356.99'
'Riprap Weir class 1A
Weir Elev.=355.93' (Outfolls Into class 1A,
Rip -Rap Channel
14' wide section)
EMERGENCY SPILLWAY DETAIL
NOT TO SCALE
Note: Clear and maintain the emergency spillway free of vegetative growth.
�• 1
Forebay Bottom = 346.0
Top of Dam Elev = 352,25
SWM-1 FOREBAY DETAIL
6 SECTION B-B
SW14 HORIZ. SCALE: 1"=12'
VERT. SCALE: 1"=6'
7
SWM-1
DETAIL
SW14
HORIZ.
SCALE:
V=6'
VERT. SCALE:
C=3'
75° V-NOTCH WEIR. Elev. = 354.00'
1Cquatic
B nth
3.0" Orifice*, Elev. = 349.60' p
Elev. = 348.60
Bottom Elev Pond 1 = 344.0'0lJ ' 8'4x1.5'
Concrete Base
ShortVersion BMP Computations For Worksheets 2 - 6
Albemarle County Water Protection Ordinance: Modified Simple Method
Plan: Cases the -Pond 1 Water Resources Area: Development Area
Prepaner: Dominion Engineering Date: ind/2013
Project Drainage Area Designalion Pond-1
L storm pollutant export in pounds, L = [P(PI)RW12I [ C(A)2 721
W meammno8coefhcimn, M=005+0opm)
PI small storm connection factor, 09
I rvi percent impeousness
P annual precipitation, 43" in Athenians
A project area in acres in subject drainage area, A = 20447
C pollutant concentration, mgA or ppm target phosphorus
f factorappliedto RR
V reguinedtremmerlvmume in cy, 0 Suverimpew area= Ady13550d) 5/12y27
RR required removal, Lgaten-fx Lam)
-/t removal efficiency, RR10D/L(post)
Impervious Cover Compue lion (values in feet a square feet)
Rem
pre-aeve,opmem
Area poE,ueveiopmenx
Area
Roads & Panting
Length
Width
subtotal
Length
Width
subtotal
0
0
7m059
0
0 101059
0,
0
0
0
0 - 10890
0
0
0 o
0
101059
1
_
0
111919
DrNeways Length
Width
no.
subtotal
Length
Width
W.
subtotal
and walks 0
0
0
0
0
0
0 0
0
0
0
0
0
0
0 0
0
0
at
ul
ul
0
1
2
3
4
1
2
3 4
0
0
0
Grexi areas AMArea
x 030 =
0
x 0.70 =
30492
4356
Stmctures
Area
no.
subtotal
Area
an.
subtotal -
0
0
43560
0
0 43560
0
0
0
0
0 65M
ul
01
0
43560
0
b0094
Actvelyyre2ed pasture&
Area
Area
yams and curveted tuts
1524 00
x 0.08 =
12191
217800
x 0.08 =
17424
Active crop land
Area
Area
x 0.25=
0
x0.25=
0
Other rnper ecus Areas
0
0
Impervious Cover
Hprs,
suix,
W(posg
V
0 24
New Development (For Development Areas, existing
Impervious cover<=20614
C
f
I (pre) Rv(pre)
L(pre)
L(post)
I RR I %RR
Area Type
070
100
20916, 023
2858
29-36
0-78
DevebPmem Area
035
1-00.sissishiss
---021
1305
1466
1W
Dunking Water Watersheds
040
1.
0,l
1492
1 15 fS
1 tan
Other Rural Land
'ME values
Redevelopment (Far Development Areas,
existing impervious cover> 20%4
C
f
I (pre). RaOn )
L(pre)
Llpost)
RR %an
Area Type
070
090
023
2856
29-36
364
Devebpmem Area
035
085
U21
I 1305
I 1468
1 3-59
Dunking Water Watersheds
040
am
021
1 1492
1 16781
4-ID
Other Rural LarM
Imemn Manual, Page 70 rev 16 Feb 1998 GEB
�� EMERGENCY SPILLWAY DETAIL
+ � (SECTION A -A)
SW14 NOT TO SCALE
2
15' Aquatic
Bench
....rervious Core*
*Impervious core shown for informational
purposes only. Final design to be provided
by geotechnical engineer.
Short Version BMP Computations For Worksheets2 -6
Albemarle County Water Protection Ordinance: Modified Simple Method
Plan: Casradia subdivision Water Resources Area:
Dmxbopmerd A.
Prepans: Dominion Engineering Dale: g/1312014
Project Drainage Area Designalbon DAPOND 2 POST DEVELOPMENT
L storm pollutant export in Pounds, L = [P(PaRv/121 [ C(Ap 721
Rv meammmoficceficient, Rv=005+O m90)
P' small storm correction factor, 0 9
I percent imperviousness
P annual precipitation, 43" in Albemarte
A project area in acres in subject drainage area,
C pollutant concentration, NA or ppm target phDSphDMS
I ,actor applied to RR
V Required! treatment valume in cy, 0 5" ever imperv. area = A(IN356m) 5/12y27
W requiretl removal, L(posn-fx Lane)
'/RR removideficiency, RR100/L(post)
Impervious Cover Computation (values in feet a square feet)
Itam
pre -development Area postdevetopmend
Ares
Roads & Panting Length Width subtotal Length
Width subtotal
0 0 0
o e 0
0 0 1szban
o
0
0 0
0
0 0
1
1 0 152460
Dnveways Length Width no. subtotal Length Width
no
subtotal
and walks 0 0 0 0 0
0 0 58806
0 0 0 0 0
0 0 23958
j 0 0 0
01 01 0 827614
- 1 2 3 4
1
2 3 4
\VULIUIIJ IIILU I.IUJJ IY„
Rip -Rap Channel
14' wide section)
Elev. = 348.6
SWM-1 Bottom = 344.0
Top of Dam
Elev = 358.00
/ 66.0'-30" HDPE
Inv=346.57 0 2.83%
030= 01 F 43561x 0.70=
01
0
0
217M
0
Actively -limed pasture&
Area
Area
yams and cultivated! turf 982878 it 0.08 =
T7014 08
644601 x Bell =
Active crop land Area
Area
x 0.25=
0
1 x025=
Other Impervious Areas (Future Dmelopmere Town"
Phase)
0
Impervi ous Cover
I(Pre)
Rvlpost)
V
0 41
234 3
New ment Areas existing Development For Develo ment
P P g Me pervious covers=20 4
C f I (pre)' Rvlpre) L(pre)
L(post)
RR
%RR Area Type
070 1 00 20% 023 M 30
11543
51.13
M% Development Area
035 1 W sla ON 13.25
5771
4446
77116 Drinking Water Watersheds
0 40 1 00 m 15.15
65 all
50 81
FI75 Other Rural Land!
' min. values
Redevelopment (For Development Areas, eAsgng
impervious cover>
2014
C f I (pre)' Rv(pre)
I Lgme)
L(pos0
RR
%RR Area Type
0 70 ON 20% 023
M 30
11543
57 M
Desu npme l Area
0 35 0 85 0% 0 m
13 25
5171
4645
- Drinking Water Watersheds
0 40 08116u m ii, am _ 1515
65 %
5308
Other Ruml Land
Interim Manual, Page
70 rev 16 Feb 1998 GEB
2 BMP CALCULATIONS
SW14 SCALE: 1"=100'
s
4 44.4,4.1
►��1114�41
t,.i
11*i
Ij 11
/16- HOLES
AS SHOWN
LD (TrP.)
STEEL ANGLE (TYP.)
A 1/2" X 1/4" STEEL
STOCK WELDED TO
BASE AS SHOWN
r�
a
GENERAL NOTES FOR TRASH RACK
1. STEEL TO CONFORM TO ASTM A-36.
ev. = 349.6 2. ALL SURFACES OF TRASH RACK(S) MUST BE HOT DIPPED GALVANIZED AFTER FABRICATION.
3. TRASH RACK(S) TO BE FASTENED TO WALL WITH 1/2" MASONRY ANCHORS. TRASH
RACKS) TO BE REMOVABLE.
4. TRASH RACK(S) TO BE CENTERED HORIZONTALLY OVER THE OPENING.
5. FABRICATOR MAY MODIFY COMPONENTS OF TRASH RACK FRAME TO IMPROVE
CONSTRUCTABILITY OF TRASH RACK. MODIFICATIONS MUST BE APPROVED BY
MCDPS PRIOR TO FABRICATION.
Emeraen
mpervious Core**
* DETAIL TAKEN FROM MONTGOMERY COUNTY, MARYLAND
WATER RESOURCES SPECIFICATIONS.
Iwav = 355.93'
5 ORIFICE TRASH RACK
SW14 NOT TO SCALE
*Trash rack to be installed on orifice as sh
on detail 5/SW14 or approved equal.
**Impervious core and cutoff trench shown
for informational purposes only. Final
design to be provided by geotechnical
engineer.
$W.yTH op P30
1
Dustin E. Greene
LiC. No.
1*
55833 4r
�'050 a/n/xt '�
APPROVED �&&IONAL $�G
by the Albemarle County
Community Development Department
Date 08/11/2021
File WP0201300032, Amendment #2
1.5 yr. Elevation = 354.03'
2 yr. Elevation = 354.23'
10 yr. Elevation = 355.75'
100 yr. Elevation = 356.99'
Inv = 344.70
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REVISIONS
COUNTY
COMMENTS
OCT. 2, 2018
VSMP
AMENDMENT
FEB 19, 2021
COUNTY
COMMENTS
APR. 2, 2021
COUNTY
COMMENTS
MAY 6, 2021
COUNTY
COMMENTS
AUG 30, 2021
DATE
APR. 17, 2014
SCALE
AS SHOWN
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FILE NUMBER
12.0065
SHEET
SW14
-Embed 6" Cutoff Trench*
in Concrete