HomeMy WebLinkAboutWPO202000007 Calculations 2021-02-05HARK VINEYARDS
ALBEMARLE COUNTY, VIRGINIA
WHITE HALL DISTRICT
DESIGN CALCULATIONS & NARRATIVE
WPO 2020-00007
FEBRUARY 5, 2021
TIMMONS GROUP
YOUR VISION ACHIEVED THROUGH OURS.
Prepared by: Jonathan Showalter, PE
Timmons Group
608 Preston Avenue, Suite 200
Charlottesville, VA 22903
434.327.1681
r F G' .
1TK-%N%.SHOULTGR r
I.ic. No. 0402057151
02/05/2021
Table of Contents
Section Title
Project Narrative
2.1 LD-204 Inlet Calculations
2.2 LD-229 Pipe Calculations
2.3 LD-347 Hydraulic Grade Line Analysis
2.4 LD269 Culvert Report
3 Virginia Runoff Reduction Method Worksheet Summary
Project Narrative:
This project included a new tasting room for Hark Vineyards, a parking lot, septic field,
and associated site work. The limits of disturbance is 4.88 acres.
Water Ouality
The current site is a vacant parcel that is mostly and open mowed field sloping southwest
with some wooded low areas. 4.88 acres of disturbed area was analyzed for water quality.
The site will require 1.59 lb./year to be treated. The required 1.591b./ year will be
satisfied through the purchase of nutrient credits from a DEQ approved credit bank.
Water Ouantity:
In the developed condition the runoff from the disturbed area will flow off of most of the
site as sheet flow. A Level spreader is provided at a point of concentrated discharge from
the storm system to return the runoff to sheet flow. This project fulfills the requirements
of section 9VAC25-970-66 Section D.
FORM LID 204 STORMWATER INLET COMPUTATIONS SHEET 1 OF 1
LD 204 PROJECT HARK VINEYARD DESIGNER: A.MABEE DATE 2/B/2021
CHECKED: J. SHOWALTER UNITS ENGLISH
INLETSOFT BY ENSOFTEC DATE: 2/3/2021
LD-229
STORM SEWER DESIGN COMPUTATIONS
STORM FREQUENCY 10
PROJECT: HARK VINEYARDS
LOCATION: EARLVSVILLE
COUNTY: Free Union
NOAA STATION:
Designed by: A. MABEE
Checked by: J. SHOWALTER
UNITS ENGLISN
POPE
NO,
FROM PoWT
TO POIMP
DRALY,
AREA
"A'
Acre
(3
RUNOFF
COEFF.
"C"
(0
CA
TOTAL
WLFT
TIME
Manures
RAW
FALL
N/Hr
8
RUNOFF
INVERT ELEVATIONS
LENGTH
olPipe
FL
12
SLOPE
FlI .
13
SIZE
(Du.0
Spao/Riee)
la
(16
SHAPE
Nmi-
olPipes
Capai
CFS
IS
Faction
Slope
P/R.
NORMAL
FLOW
FLOW
TRAE
Sec.
1])
REMARKS
18
WCRE-ACCUM-
MENT
(5
ULATED
6
Le¢rel
CFS
Tou1Q
CFS
(9)
UPPER
END
(10
LOWER
END
11
Depl6 al
Flow,&
Ft
Area of
R ,Aa
SqF[
Hm
Ft
Vn
PoSec
(16
Pn
Ft
REFERENCE
1
STA.
REFERENCE
2
STA.
101
102
100
O.ql
O.W
058
588
561
&00
337
628.81
593.2➢
150g1
0.19]MI
IS
ck-d.
1
3109
0.00ZO0
028
ON
0.17
1658
055
905
103
IN
102
0.06
085
0.05
058
580
5.m
&W
337
63]63
630.23
61.]0
0.11936
IS
cumd.
I
M,U
0O ZO0
032
026
0.18
13,89
331
0"
105
106
IN
ON
065
0.03
0,16
5%
5]8
&W
081
W6
615.82
41W
O.OIW2
12
cumd.
1
3.86
00O50
031
0.21
0.18
3.89
055
11.02
107
1p8
106
0.26
003
0.11
0.11
Sql
589
0.00
066
66].16
616.35
]9.]A
O.g193]
12
Cirtuly
1
3.85
O.OW30
028
0.18
0.16g167
009
2L60
111
112
IN
OAI
063
0.26
On
52]
581
&W
230
63961
63].80
163.66
O.OIW2
12
cumd.
1
3.86
0003]0
056
005
0.2]
096
31.89
113
116
112
0.29
00]
0.10
0,16
Sql
5.89
0.00
ON
W42
63978
63.89
O.OIW2
8
COMO-
1
1.31
0.00NO
038
020
0.18
062
16.20
LP347 PROJECT: HARK VINEYARDS DESIGNED BY: A. MABEE
HYDRAULIC GRADE LINE ANALYSIS
Checked: J. SHOWALTER
10 Year
IMET
OR
JUNCTION
STR.
INVERT
EL.
OUTFLOW
PIPE
DEPTH
OFFLOW
OUTFLOW
PIPE
CUTLET
WATER
SURFACE
ELEV.
DIA
PIPE
Do
INmm
DESIGN
DISCH,
Co
CFMMS
IENGTH
PIPE
Lo
EGA
FRICTION
SLOPE, Ski
(FTh)
MM1
FRICTION
LOSS
HI
"
JUNCTON
LOW
SURFACE
FLOW
Mj. Ht
1.3
HI
FVM
InAA
Soap'?
YAK
0.5
HI
F0M(FM)
FINAL
H
Inkl
Water
Surface
E4yron
Top o1 MH
Top d lnlut
Elev.
APPROX.
AdpAboolP
Vo
Cmtr.
Ho
FAA
V.
Vi-Wg
IIi(Enpn)
0.35-MA%.
SKEW
AWW
K
Berg
H
FNA
Sum
AL
FVM
1
2
3
d
5
6
8
9
10
11
12
13
16
15
16
16
17
18
19
100
600.580
102
599.200
1.25
600.580
15
3.368
150.00
0.00242
0.363
16.584
1.068
13.894
2.998
1.049
0.0
0.00
0.000
2.117
0.000
2.117
YES
1.058
1.422
629.088
635.170
O.K.
104
630.230
1.25
631.230
15
3.368
61.70
0.00242
0.149
13.894
0.749
5.132
OA09
0.143
0.0
0.00
0.000
0.893
0.289
0.893
YES
0.446
0.596
637.945
649.500
O.K.
112
637.800
1.D0
638.600
12
2.298
163.64
0.00371
0.606
5.132
0.102
3.943
0241
0.084
0.0
0.00
0.000
0.187
1.498
0.243
YES
0.121
0.728
639.995
643.500
O.K.
114
639.780
0.67
640.313
8
0.800
63.89
0.00390
0.249
3.943
0.060
0.000
0.000
0.000
0.0
0.00
0.000
0.060
0.800
0.078
YES
0.039
0.289
640.796
643.610
O.K.
106
645.820
1.00
646.620
12
0.809
42.92
0.00046
0.020
3.894
0.059
3.668
0.209
0.073
0.0
0.00
0.000
0.132
0.150
0.132
YES
0.066
0.086
646.706
650.500
O.K.
108
646.350
1.00
647.150
12
0.659
79.24
0.00030
0.024
3.668
0.052
0.000
0.000
0.000
0.0
0.00
0.000
0.052
0.659
0.068
YES
0.034
0.058
6d].620
649.830
O.K.
PROJECT HARK VINEYARD CULVERT DESIGN FORM L 269
ROAD COUNTY Alt, m.k (Zone 1) SHEET OF DESIGNER: A MABEF DATE: 2/3nWI
CULVERT 201 VA UNITS ENGLISd REVIEWER: iHOWALT DATE:
NOAA SIadoa Fa Vmon
H.W. ELEV V/S DISCHARGE OUTLET VELOCITY V/S DISCHARGE
644.2 6.1
644.2 6.1
644.2 6.0
644.2
�W644.2 C 6.0
y44.2 > 5.9
3fi442 w 5.9
s644.2 F
644 2 O
5.8
644.2 5.8
644.1 5.7
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
DISCHARGE DISCHARGE
TW DEPTH V/S DISCHARGE
0.4
0.4 -
Z 0.4
rL
0.4
0.4
0.4
0.4
1 1 1 1 1 1 1 1
DISCHARGE
CULVERTSOFT by ENSOFTEC, INC.
TW VELOCITY V/S DISCHARGE
2.4
2.4
2.4
H
2.4
J
> 2.4
F 2.3
2.3
2.3
1 1 1 1 1 1 1 1
DISCHARGE
DEQ Virginia Runoff Reduction Method Re-Developm
112011 BMP Standards and Specifications 02013 Draft BMP Standards and Specifications
Project Name: Hark Vinyard
Date: 2/2/2021
Linear Development Project? No
Site Information
Post -Development Project (Treatment Volume and Loads)
Enter Total Disturbed Area (acres)
eDevelopment land Cover (acres(
data input cans
constant values
calcula0on cells
Linearparr No
Land cover areas entered correctly?
Total disturbed area entered?
A soils
Bsoils Csoils
DSoils
Totals
'Open Space (acres)- undisturbed
open space
o.ao
ad Turt (acres) -- restated, graded for
r other turf to be mowed/managed
4.83
4.83
lops Cover (aces)
0.05
0.05
4.88
Development Land Cover (acres(
A Soils
BSoils
Csoils
DSoils
Totals
'Open Spare (acres)-- undisturbed,
'ad forestlopen space orreforested lane
0.00
ad Tud (acres)-- retained, rtained, graded for
r other turf to be moed/man ed
w
4.08
9.08
lous eoaer (arras)
0.80
0.80
Area Check
OK.
OK.
OK.
OK.
4.88
:ants
Runoff Coefficients
Rv
Rainfall (inches)
43
1
ASolls
BSoils
Csoils
Dsoils
Rainfall Event (inches)
1.00
ForesVOpen Space
0.02
0.03
0.D4
0.05
hosphorus[TP) EMC(mg/L)
0.26
Managed Turf
0.15
0.20
0.22
0.25
itrogen(TN) EMC(mg/L)
1.86
Impervious Cover
0.95
0.95
0.95
0.95
TP Load (lb/acre/,)
OAl
less correction favor)
0.90
iIND COVER SUMMARY -- PRE
-REDEVELOPMENT
LAND
COVER
SUMMARY POST
DE
Land Cover Summary -Pre
Land Co., summary-Post(Final)
Land Cover Summary-Posr
Pre-ReDerelopment
Upped
Adjusted'
Port Race, &New Imperious
Post-ReDeMic,ament
Forest/Open Space Cover(acres)
0.00
am
Fmiat/Open Space
Cover (acres)
000
Foreabi Space
Cover(acres)
0.00
Weighted Rv(farest)
0.00
0.00
Weighted Rv(trest)
1 0.00
Weighted Bahama)
OAO
%Forest
0%
0%
%Fares[
1 0%
%Forest
0%
Managed Tuff Cover (acres)
4.83
4.08
Managed Tuff Cover
408
Managed Turt Cover
4.08
(acres)
(acres)
Weighted Rv(trt)
0.20
0.20
Weighted Rv(tui
0.20
Weighted Rx ani
0.20
Is Managed Tuff
99%
99%
is Managed Turt
84%
%Managed Tuff
99%
Impervious Cover (acres)
0.05
0.05
Impervious Cover
am
Recent. Impervious
OAS
(acres)
Cover (am.)
Rv(impervious)
0.95
0.95
Rv(impervices)
0.95
"impervious)
0.95
%Impervious
1%
1%
%Impervious
16%
%Impervious
1%
Total Site Area (acres)
4.88
4.13
Final Site Area (acres)
4.88
Site go
0.21
0.21
Final Post Dear Site Rv
0.32
Treatment Volume and Nutrient Load
Final Posh
Pre-ReDevelopment Treatment Volume
0.0895
O.OJ20
Development
0.1313
(acrai
Treatment Volume
(acre-ft)
Final Posh
Pre-ReDevelopment Treatment Volume
3,679
3,135
Development
5,721
(cubic feet)
Treatment Volume
(mbicfeet)
Pre-ReOevelopment TP Load
Final Poi
2.31
1.97
*
Development TP Load
3.59
(lb/Tr)
lib/yr)
Pr"eDevelopment TP Loatl per acre
Final Pml-Ilevelopment TP
(lb/acre/Yr)
0.0]
o.EB
Load per arm
0.]4
(Ib/aue/Yr)
Baseline TP Load abi
el lba/auei applied to pre- redevelopment area excluding pervious
1.69
land proposed for new impervious cover)
turned Land Cover Summary:
Re,Develapment land cower minus pervious land cover pdre.Vdpen spare or
raged turf) acreage propmedfor new impervious cover.
useedtotal acreage is consistent with Past-ReDevelopment acreage (minus
edge 7new impervious cover).
con I shows mad reduction requdementf rnew impervious cover asused on new
elopmentload limit 0.41 ms/acre/yexi
Total ReDay. SKe Area 413
(acres)
ReDev9 Rv 0.21
Treatment Volume and Nutrient Load
TP Wad Reduction Required (lbi 1 1.59
a
part-Reoevelapment
TreatmentVolume
OA720
(acre-h)
Port -Re levelopmem
Tmamen Volume
35
lNGehpt)
Port-ReDevelop n
Load nai
197
0b/Yr)•
Part-Reaevelagnent TP
Lord per acre
(Ib/ave/w)
Max. Reduction Required
audow Pre-
zo%
ReDe¢elopment Load)
To Load Reduction
Required for
Redeveloped Area 0'28
(Ib/Trl
eduction below new development I
mitnnonfmtrequired
Land Cover summory-Post
Past -Development New Impervious
New Impervious Cover
0.75
(acres)
Rv(impervious) 0.95
Port -Development
TreatmentValume 010i
(acnI
Post -Development
Treatment Volume (cubic
feat)
Port -Load gPmantlP 1b9
Load (Ib/yr)
TP Load Reduction
Required for New 1.32