HomeMy WebLinkAboutWPO201900050 Calculations 2021-03-15BERKMAR OVERLOOK STORMWATER
MANAGEMENT CALCULATIONS PACKET
Amendment #1
Date of Calculations
AUGUST 28, 2019
Revised on
October 4, 2019
Amendment #1 Revised on
March 15, 2021
Calculations updated with this VSMP Amendment #1 are highlighted within this
calculations package.
gjQX
�i APPROVED
by the Albemarle County
SCOTT R. IINS'Z Community Development Department
No. 35791 Date 0P 4/02/2021
File WP0201900050 — Amendment #1
P 3/25/21 w4
�SsiotinL �=�G�
PREPARED BY:
COLLINS ENGINEERING
200 GARRETT STREET, SUITE K
CHARLOTTESVILLE, VA 22902
434.293.3719 PH
434.293.2813 FX
www.collins-engineering.com
SCS TR-55 Calculations
Soils Map (Source: NRCS Web Soil Survey Online Database)
Soils Table (Source: NRCS Web Soil Survey Online Database)
Albemarle County, Virginia (VA003)
Albemarle County, Virginia
(VA003)
Map Unit Map Unit Name
Acres Percent of
Symbol
in AOI A0I
27C Elioak loam, 7
3.5 39.7%
to 15 percent
slopes
34D Glenelg loam,
0.7 8.5%
15to25
percent slopes
65B Pacolet sandy
4.6 51.8%
loam, 2 to 7
percent slopes
Totals for Area of
8.8 100.0%
Interest
Note: The NRCS web soil survey has catorgized this development's soils as predominately consisting of
hydrologic soil group type B.
Precipitation Data
(Source: NOAA's National Weather Service, Hydrometerorological Design Studies Center, Atlas 14
Point Precipitation Frequency Estimates)
Map v
Tartan
Pd
South Fork od°°�c
F.ivanna River �o
Reservoir
o �1
O`
<F
e`
0
>,f
POINT PRECIPITATION FREQUENCY (PF) ESTIMATES
WITH 90'S CONFIDENCE INTERVALS AND SUPPLEMENTARY INFORMATION �_
NOAA Atlas 14, VOlume 2, Version 3
PDS-based precipitation frequency estimates with 90% confidence intervals (in inches)"
Omatlan Arma nxvneix:e inbrval ears
24 fi� 1.01 74. 16- 5 5.50 6.75 7.81, 9.-11 1011 123 14.0
(2.703.38) (327J.OB) (4.165.71) (4.91b.15) (5.9&7.63) (6.8fF8.71) (7.87-10.0) (8.81-11.4) (10.413.6) (11.7-155)
U.S. Department of Agriculture
Natural Resources Conservation Service
Project: Berkmar Overlook
Location: Berkmar Drive
Check One: present x
1. Runoff curve Number (CN)
TR 55 Warkshee, 2: Runoff Curve Number and Runoff
Developed! x
Designed! By: KM, PE
Checked! By: SRC, PE
FL-ENG-21A
06/04
Date: 3/15/2021
Date: 3/15/2021
Soil name and
Cover description
CN(weighted)=
DrainageArea
hy(Appencgroup
typgtreatment, and percent
CN
Area
Product of CNx
to product/
Calculated
Description
(Acres)
Area
(Appendix A)
,perviover
nnecte/connectedi pemoconditusa
impervious; unconnMed/annec[ed imperdous area ratio)
total area5'Value
Impervious Areas
98
0.42
41.1
DAA
Gravel Drive Areas
85
1.05
88.8
(Present)
B
Md Drive Areas
82
0.00
0.0
79.4
2.59
Lawns in Good Condition
61
0.74
44.9
Impervious Areas
98
0.35
34.1
DA B & C
Gravel Drive Areas
85
2.55
216.6
(Present)
B
Urt Drive Areas
82
0.70
57.5
)6.3
3.11
Lawns in Good Condition
61
2.20
134A
DAD
Impervious Areas
98
0.18
17.2
(Present)
B
Gravel Drive Areas
Lawns in Good Condition
85
61
0.51
0.21
43.7
12.9
81.9
2.21
DAA
Impervious Areas
98
0.22
21.3
(Developed)
B
Woods in Goad Condition
55
0.00
0.0
69.0
4.50
Lawns in Good Condition
61
0.)9
48.4
Impervious Areas
98
3.68
360.8
DAB
B
Woods in Goad Condition
55
0.00
0.0
80.7
2.39
(Developed)
Lawns in Good Condition
61
3.23
196.9
Impervious Areas
98
0.12
11.5
DAC
B
Woods in Goad Condition
55
0.00
0.0
65.8
5.19
(Developed)
Lawns in Good Condition
61
0.)8
4).)
Impervious Areas
98
0.Do
0.0
DAD
B
Woods in Goad Condition
55
0.00
0.0
61.0
6.39
(Developed)
Lawns in Good Condition
61
0.08
40.9
2. Runoff
1-Year Storm
I 2-Year Storm
10-Year Storm
Drainage Area Description
Frequency -years
1
2
10
n/a
Rainfall, P(24 hour -inches
3.01
3.64
5.50
n/a
Runoff, Q-inches
1.22
1.71
3.28
DAA(Present)
Runoff, Cl- inches
1.04
1A9
2.98
DA B & C (Present)
Runoff, Cl-inches
1.38
1.89
3.52
DA D(Present)
Runoff, Cl-inches
0.67
1.04
2.32
DA A(Developed)
Runoff, Cl-inches
1.30
1.80
3.40
DA B(Develaped)
Runoff, Q-inches
0.54
0.87
2.06
DA C(Develaped)
Runoff, Q-inches
0.37
0.64
1.69
DAD(Develaped)
U.S. Department of Agriculture
Natural Resources Conservation Service
TR 55 Worksheet 3: Time of Concentration (T j or Travel Time (T j
Project: Berkmar Overlook
Location: Berkmar Drive
Check One: Present X Developed X
Check One: T, X Tt
Designed By: FGM, PE
Checked By: SRC, PE
Through subarea n/a
FL-ENG-21A
06/04
Date: 10/4/2019
Date: 10/4/2019
DAA
DAB&C
DAD
DAA
DAB
DAC
DAD
(Present)
(Present)
(Present)
(Developed)
(Developed)
(Developed)
(Developed)
Segment ID:
Sheet Flow: (Applicable to T, only)
1 Surface description (Table 3-1)
Dense Grass
Dense Grass
Dense Grass
Dense Grass
Dense Grass
Dense Grass
Dense Grass
2 Manning's roughness coeff., n(Table 3-1
0.24
0.24
0.24
0.24
0.24
0.24
0.24
3 Flow length, L (total L < 100) (ft)
40
20
40
40
60
100
30
4 Two-year 24-hour rainfall, P2(in.)
3.6
3.6
3.6
3.6
3.6
3.6
3.6
5 Land slope, s(ft/ft)
0.075
0.10
0.025
0.075
0.05
0.18
0.2
6 Compute Tr=[0.007(n•L)°'a)/Pis IP°
0.06
0.03
0.10
0.06
0.10
0.09
0.03
Shallow Concentrated Flow:
7 Surface description (paved or unpaved)
Unpaved
Unpaved
8 Flow Length, L (ft)
75
I10
9 Watercourse slope, s(ft/ft)
0.013
0.082
10 Average velocity, V (Figure 3-1) (ft/s)
1.8
4.6
11 Tt=L/3600'V
0.01
0.01
Channel Flow:
12 Cross sectional flow area, a (ft)
c T
c T
3 m
3 w
3
o a w
3 o w
13 Wetted perimeter, P„(k)
u E
° e
u E
v c
c
14 Hydraulic radius, r=a/P„(ft)
o '"
°
cL
c n
E°
c E
15 Channel Slope, s (ft/ft)
s m u+
s m u+
s mn v+
u
16 Manning's Roughness Coeff, n
U
U
U
`o
o a
o a
17 V= [ 1.49r s65 ) / n
0
0
'u
'u
18 Flow length, L (ft)
m 'o
m 'o
m 3
1O a
a
19 T, L/3600'V
0.03
0.02
0.03
0.02
0.00
20 Watershed or subarea Tor Tr
(Add Tt in steps 6, 11 and 19)
0.10
0.10
0.11
0.10
0.12
0.10
0.10
Time of Concentration Notes:
1. The most conservative post -development SCS Tc is 0.10 hrs.
2. The Post -Development DA B Tc is slightly longer because the ReDevelopment scenario has less impervious areas and promotes infiltration with more grass
U.S. Department of Agriculture
Natural Resources Conservation Service
Project: Berkmar Overlook
Location: Berkmar Drive
Check One: Present % Developed %
TR 55 Worksheet 4: Graphical Peak Discharge Method
Designed By: KKW, PE
Checked By: SRC, PE
Date: 3/15/2021
Date: 3/15/2021
1. Data
Drainage Area
Description
Drainage Area
Description
Drainage Area
Description
Drainage Area
Description
Drainage Area
Description
Drainage Area
Description
Drainage Area
Description
DAA
(Present)
DAB&C
(Present)
DAD
(Present)
DAA
(Developed)
DAB
(Developed)
DAC
(Developed)
DAD
(Developed)
Drainage Area (Am) in miles? =
0.0034
0.0091
0.0014
0.0016
0.0108
0.0014
0.0001
Runoff curve number CN=
79.4
76.3
81.9
69.0
80.7
65.8
61.0
Time of concentration (Tc)=
0.10
0.10
0.11
0.10
0.12
0.10
0.10
Rainfall distribution type=
II
II
II
II
II
II
II
Pond and swamp areas spread
throughout the watershed=
0
0
0
0
0
0
0
2. Frequency -years
1
2
10
1
2
10
1
2
10
1
2
10
1 2 10
1
2
10
1
2
10
3. Rainfall, P (24 hour)- inches
3.01
3.64
5.50
3.01
3.64
5.50
3.01
3.64
5.50
3.01
3.64
5.50
3.01 3.64 5.50
3.01
3.64
5.50
3.01
3.64
5.50
4. Initial Abstraction, la- inches
0.52
0.52
0.52
0.62
0.62
0.62
0.44
0.44
0.44
0.90
0.90
0.90
0.48 0.48 0.48
1.04
1.04
1.04
1.28
1.28
1.28
S. Compute la/P
0.17
0.14
0.09
0.21
0.17
0.11
0.15
0.12
0.08
0.30
0.25
0.16
0.16 0.13 0.09
0.34
0.29
0.19
0.42
0.35
0.23
6. Unit peak discharge, Qu-csm/in
975
975
1000
975
975
1000
950
975
1000
950
975
975
925 950 950
900
950
975
750
900
975
7. Runoff, Qfrom Worksheet 2- inches
1.22
1.71
3.28
1.04
1.49
2.98
1.38
1.89
3.52
0.67
1.04
2.32
1.30 1.80 3.40
0.54
0.87
2.06
0.37
0.64
1.68
8. Pond and Swamp adjustment factor, Fp
1
1
1
1
1
1
1
1
1
1
1
1
1 1 1
1
1
1
1
1
1
9. Peak Discharge, Qp-cfs
where Qp=Qu Am Q Fp
4.10
5.72
11.27
9.18
13.15
27.02
1.84
2.59
4.95
1.01
1.59
3.58
See Routing
Calculations
0.69
1.16
2.83
0.03
0.07
0.20
WATERSHED SUMMARY
Pre -Development
Post -Development
Area,
1-year Flow,
2-year Flow,
10-year Flow,
Area,
1-year Flow,
2-year Flow,
10-year Flow,
CN
ac.
cfs
cfs
cfs
ON
cfs
cfs
cfs
ac
DAA
79.4
2.20
4.10
5.72
11.27
69.0
1.01
1.01
1.59
3.58
DA B
80'7
6.91
3.61
11.28
23.06
76.3
5.8
9.18
13.15
27.02
DA C
65.8
0.90
0.69
1.16
2.83
DA D
81.9
0.9
1.84
2.59
4.95
61.0
0.08
0.03
0.07
0.20
77.6 8.90 15.12 21.46 43.24 77.7 8.90 5.34 14.11 29.67
Channel and Flood Protection Calculations & Summaries
9 VAC 25-870-66
Section B: Channel Protection
"Concentrated stormwater flow shall be released into a stormwater conveyance system and shall meet the
criteria in subdivision 1, 2 or 3 of this subsection..."
Section B.1: Manmade stormwater conveyance systems
"When stormwater from a development is discharged to a manmade stormwater conveyance system,
following the land -disturbing activity, either..." a. or b. shall be met:
Section B.1.b.
"The peak discharge requirements for concentrated stormwater flow to natural stormwater conveyance
systems in subdivision 3 of this subsection shall be met."
Section B.3
"... the maximum peak flow rate from the one-year 24-hour storm following the land -disturbing activity
shall be calculated either.." a. or b."
Section B.3.a.
In accordance with the following methodology:
Q < I.F. * (Q Pre -Developed * RV Pre -Developed) / RV Developed
Q Allowed
12.06 cfs
Where the following inputs are used
CN Pre-ReDeV =
77.6
CN Post-ReDev.
77.7
S Pre-ReDev=
2.88
S Post-ReDev.=
2.87
RV Pre-ReDev=
1.12
RV Post-ReDev.=
1.12
Q Pre -Developed =
15.12
I.F. =
0.8
Notes:
CN represents the weighted Curve Numbers
(Shown in the Watershed Summary Table at the bottom of Worksheet 4.)
S was calculated by using the SCS TR-55 manual's equation 2-4.
(The Weighted CN values described above were used.)
RV was calculated by using the 5CS TR-55 manual's equation 2-3.
(The Weighted CN values & RV values described above were used.)
Q Developed = 5.34 cfs
Section B.4 Limits of Analysis
The analysis terminates at subareas A, B, C & D since subsection B.3.a is met.
9 VAC 25-870-66
Section C: Flood Protection
"Concentrated stormwater flow shall be released into a stormwater conveyance system and
shall meet one of the following criteria as demonstrated by use of acceptable hydrologic and
hydraulic methodologies:"
Section C.2.b.:
The site "releases a postdevelopment peak flow rate for the 10-year 24-hour storm event
that is less than the predevelopment peak flow rate from the 10-year 24-hour storm event.
Downstream stormwater conveyance systems do not require any additional analysis to show
compliance with flood protection criteria if this option is utilized."
Section C.3 Limits of Analysis
The flood protection analysis terminates at subareas A, B, C & D since subsection C.2.b is met.
Proposed Routing Calculations
BasinFlow printout
INPUT:
Basin: Berkmar Drive- SWM Facility Routings
5 Contour Areas
Elevation(ft) Area(sf) Computed Vol.(cy)
518.00 37.00 0.0
520.00 964.00 29.4
522.00 2647.00 158.0
524.00 4867.60 432.2
526.00 7535.00 887.9
Start—Elevation(ft) 518.00 Vol.(cy)
5 Outlet Structures
Outlet structure 0
Orifice
name: Barrel
area (sf) 1.767
diameter or depth (in) 18.000
width for rect. (in) 0.000
coefficient 0.500
invert (ft) 516.000
multiple 1
discharge out of riser
Outlet structure 1
Orifice
name: Low -Flow Orifice
area (sf) 0.196
diameter or depth (in) 6.000
width for rect. (in) 0.000
coefficient 0.500
invert (ft) 518.000
multiple 1
discharge into riser
Outlet structure 2
Orifice
name: Mid -Flow Orifice
area (sf) 0.442
diameter or depth (in) 9.000
width for rect. (in) 0.000
coefficient 0.500
invert (ft) 522.000
multiple 1
discharge into riser
Outlet structure 3
Weir
name:
Riser
diameter (in)
48.000
side angle
0.000
coefficient
3.300
invert (ft)
523.500
multiple
1
discharge
into riser
transition at (ft)
1.215
orifice coef.
0.500
orifice area (sf)
12.566
Outlet structure 4
Weir
name: Emergency Spillway
length (ft)
25.000
side angle
75.960
coefficient
3.300
invert (ft)
524.500
multiple
1
discharge
through dam
4 Inflow Hydrographs
Hydrograph 0
SCS
name: 1-yr
24-hr. SCS Design Storm
Area (acres)
6.910
CN
80.700
Type 2
rainfall, P (in)
3.010
time of conc. (hrs)
0.1200
time increment (hrs)
0.0200
time limit (hrs)
30.000
fudge factor
1.00
routed
true
peak flow (cfs)
11.039
peak time (hrs)
11.922
volume (cy)
1208.403
Hydrograph 1
SCS
name: 2-yr 24-hr. SCS Design Storm
Area (acres) 6.910
CN 80.700
Type 2
rainfall, P (in) 3.640
time of conc. (hrs) 0.1200
time increment (hrs) 0.0200
time limit (hrs) 30.000
fudge factor
1.00
routed
true
peak flow (cfs)
15.264
peak time (hrs)
11.922
volume (cy)
1670.833
Hydrograph 2
SCS
name: 10-yr
24-hr. SCS Design Storm
Area (acres)
6.910
CN
80.700
Type 2
rainfall, P (in)
5.500
time of conc. (hrs)
0.1200
time increment (hrs)
0.0200
time limit (hrs)
30.000
fudge factor
1.00
routed
true
peak flow (cfs)
28.845
peak time (hrs)
11.922
volume (cy)
3157.443
Hydrograph 3
SCS
name: 100-yr
24-hr. SCS Design Storm
Area (acres)
6.910
CN
80.700
Type 2
rainfall, P (in)
9.010
time of conc. (hrs)
0.1200
time increment (hrs)
0.0200
time limit (hrs)
30.000
fudge factor
1.00
routed
true
peak flow (cfs)
56.506
peak time (hrs)
11.922
volume (cy)
6185.344
OUTPUT:
Routing Method: storage -indication
Hydrograph 0
Routing Summary of
inflow (cfs)
discharge (cfs)
water level (ft)
storage (cy)
Hydrograph 1
Peaks: 1-yr 24-hr
11.020 at
3.607 at
523.425 at
336.111
SCS Design Storm
11.92 (hrs)
12.10 (hrs)
12.10 (hrs)
Routing Summary of
inflow (cfs)
discharge (cfs)
water level (ft)
storage (cy)
Hydrograph 2
Routing Summary of
inflow (cfs)
discharge (cfs)
water level (ft)
storage (cy)
Hydrograph 3
Routing Summary of
inflow (cfs)
discharge (cfs)
water level (ft)
storage (cy)
Peaks: 2-yr 24-hr.
15.237 at
11.281 at
523.814 at
399.442
Peaks: 10-yr 24-hr
28.794 at
23.058 at
524.613 at
551.166
SCS Design Storm
11.92 (hrs)
12.02 (hrs)
12.02 (hrs)
SCS Design Storm
11.92 (hrs)
12.00 (hrs)
12.00 (hrs)
Peaks: 100-yr 24-hr. SCS Design Storm
56.407 at 11.92 (hrs)
55.335 at 11.94 (hrs)
525.039 at 11.94 (hrs)
644.304
Sun Mar 14 17:55:10 EDT 2021
DEQ Virginia Runoff Reduction Method
Water Quality Calculations for ReDevelopments
(COMPLIANCE IS MET THROUGH THE BEST MANAGEMENT PRACTICE OF PURCHASING NUTRIENT CREDITS.)
APPROVED VRRM RE -DEVELOPMENT
DIED, w.ynm xunobaeeumon metnoe9e-osreroemenf mmeuonre spreaasnen -version 3.a
ou amP suers 0 M23 orm vP wmark am sce�axan
Pwl PexYmax OveaooY DeveI m MaiMrelk
Linear Deuelopmem Prole[N xp ypyapnrelk
Site Information
Post -Development Project (Treatment Volume and Loads)
Enter Total Disturbed Area (g[res) � 959 Cheat:
� peepw 3 maa
o meo xo
I�tonemmea: enre,..ee.earorsemN11,7 J
� rMehrvmeameo emeem J
Pre-WD—.proem tang Cover a
s a
zeyaan swa lams - •neix�vmm,
resJwenxeaeo�re�aeareeem
ae�annlarery-e
e55
STwr•ual�l
Sig
sg
Po6ewe Went UM Ga u (mas)
r.e/ace•sw�l=ree-u,[.amm,
OLD
nnl•o+:l �eaa 4o+ewb
sy
�Rm.orenn.a��aw
I=re:l
IEdS
grr Gad
OL
OL
R
as.
969
[onrows
ro.wnrn.mw�n
lar,
Emm::l
srea..pPmscere
nx..ymm:sl
liPla[I
k»emrt
(
we leh.Nnl
LAND COVER SUMMARY PRE REDEVELOPMENT
LAND
COVER
SUMMARY POST C EVELOPMENT
as .sddard
a
txrmaniarv�r P.,
wGarA�emM r..adn.raaornae
[maertwpmn
Nw.a'
beNsa�al M4Jpwnwwmis
raar/apensp.eunvl�l
�a�.
rneM1VmAOe
a omn ro"rreml
and
arreard"'(de—I
ne
a%
o%
aa-ad.'—,—1
a51
tat
amaair-f—I nY ra,�aue—
dured me
ayneream
W
o.m
'Mudd -lam o.m regnm n.11.1
aa�ea..n 1.
1—o1 a3s uaeI.le..eil v a.ss ne ..P3 - .1.
Metre—il oas Nd-ce a-1 011 x.ii— .v�
an asw
a.e..1aW W ..av re° san
xewvsne av o5I
Treatment Volume and Nutrient Load
traq�rem a�.agmaa
aar...m*w
as
m
aw�a�lmil
s.m
51a
Metre il
sa
s3%
x alaml
an—W
T.l Volume and
Nurient Load
a va
banal a.
...I
oa�a
mre re mre rea
Vet aa3u rea
l..mal paap la. "um
tr arra
e aarea Wd�ael mvaa.
.....
"ter
ee..a " r&6A .m. s&eN mum.lmu. - Treoud.treyere
let fard etl
rn m eardee'arr�m
hs nwe
P/wl
13]a
l3.]a
OmeneR 1186 -a,
el t fYb -
pa/s+l le/lit.IMra
wn-wmMi •n
.b.aaNa,. —pdr—
.•e a.>o�a...,.
ov�NnlMsNn�m
��
mdidMj
r�.ed.e..,,,aa..a
.n
w. we.m.iw� aa= M7
m..a...»m.a..
aea
a..�.aba.
..rn
uaeaaa
e.ewmeab.e.ae.,a.,,.ee,.,re,.awm,a..ww�a=o�s���+
�.xa
aee.aean.la.
o
aMr are�eam,�e.,mae,,,.mm.e..
a�eaoeaa
� .ea
IIbMI
lae.mae.�nbnd
+a�n.aaw�re�e,.man.e...,mw.a.eaceaamm.a.rea�lmo.. oe�ee
Poeft-Development Requirement for Site Area
TL Iaaa Reautllon aeovi.ea llb/r9 Lla
Nitrogen Loads QMarnutlonal VurPotes Only/
�.am
m
�evnparxuaeaWM ssns
Ibae�q.emarAins�.aat
y8z
0441
Site Results (Water Quality Compliance)
Area Checks
D.A. A
D.A. B
D.A. C
D.A. D
D.A. E
AREA CHECK
FOREST/OPEN SPACE (ac)
0.00
0.00
0.00
0.00
0.00
OK.
IMPERVIOUS COVER(ac)
0.00
0.00
0.00
0.00
0.00
OK.
IMPERVIOUS COVER TREATED(n)
0.00
0.00
0.00
0.00
0.00
OK.
MANAGED TURF AREA(ac)
0.00
0.00
0.00
0.00
0.00
OK.
MANAGED TURF AREA TREATED(aC)
0.00
0.00
0.00
0.00
0.00
OK.
AREA CHECK
Site Treatment Volume (ft;)
18,8T8
Runoff Reduction Volume and TP By Drainage Area
DA. B
D.A. C
D.A. D
D.A. E
TOTAL
RUNOFF REDUCTION (ft3)
0
0TP
LOAD AVAILABLE FOR REMOVAL (Ib/yr)
Ek
0.00
0.00
0.00
0.00
0.00
REDUCTION ACHIEVEDACHIEVED
TP LOAD REDUCTION ACHIEVED (Ib/yr)
0.00
0.00
D.00
o.o0
0.00
TP LOAD REMAINING (Ib/yr)
D.DD
O.DD
D.00
D.DD
D.DD
O.DD
NITROGEN LOAD REDUCTION ACHIEVED (Ib/yr)
0.00 0.00
0.00
0.00
0.00
E 0.00
Total Phosphorus
FINAL POST -DEVELOPMENT TP LOAD (IbNr)
11.86
TP LOAD REDUCTION REQUIRED (Ib/yr)
1.24
TP LOAD REDUCTION ACHIEVED (Ib/yr)
0.00
TP LOAD REMAINING (Ib/yr):
11.86
REMAINING TP LOAD REDUCTION REQUIRED (Ib/Yr):j
1.24
Total Nitrogen (For Information Purposes)
POST -DEVELOPMENT LOAD (Ib/Yr)j
84.85
NITROGEN LOAD REDUCTION ACHIEVED (Ib/yr)
o.00
REMAINING POST -DEVELOPMENT NITROGEN LOAD (Ib/yr
84.85
AMENDED VRRM RE -DEVELOPMENT WITH SITE WATER QUANTITY
(DEFINED BY LOD) IMPERVIOUS AREA
or, wymio x_.#.. MnircG anoevebpmem (ampxn[e Spreadsheet - ve.3.
oepuam.s�e.a.,,az.eea[.xa o.au umeampsae.«,ms.,ew,�b,.
Pme
xnm.�odaoxeoe.ero
-�
3/IS/iY31
n
?m
une..oe. i
-- ---___ _--
Site Information
Post -Development Project
(Treatment Volume and Loads)
EmertaGl Dis[urbed Nea (ones)
969
Cbe[k:
a MP Desgn Spe[iflmfions.12M
D.X
fineaipmFtt?
No
�',,
__
I
�
mmiai:mxdareaearered?
si
ore-amewlamn.m undxwr 1>mml
Dsei.
..a,
..........
voa. w.alaa-m°-.m.a
�� o..�. ,P<.s..n,a�.°a.s
nm
m.K�wa
Pa6CevNopmem I„e xw. pttml
r...voa.:p.ar 1 m
o_.m°m ..wo. ..pa.a
nm
o�.
xnmm,
Runan CaeK[ien919a1
�m0•me.l
c..yz.e
�Ifllue[Me/4
Dal FuclmW
milMNnl1
U41
I b._��.ma.am.l
Site Results (Water Quality Compliance)
Area Checks
D.A. A
D.A. B
D.A. C
D.A. D
D.A. E
AREA CHECK
FOREST/OPEN SPACE (ac)
0.00
0.00
0.00
0.00
0.00
OK.
IMPERVIOUS COVER (ac)
0.00
0.00
0.00
0.00
0.00
OK.
IMPERVIOUS COVER TREATED [ac)
0.00
0.00
0.00
0.00
0.00
OK.
MANAGED TURF AREA (ac)
0.00
0.00
0.00
0.00
0.00
OK.
MANAGED TURF AREA TREATED (ac)
0.00
0.00
0.00
0.00
0.00
OK.
AREA CHECK
Site Treatment Volume (ft3)
18,170
Runoff Reduction Volume and TP By Drainage Area
RUNOFF REDUCTION VOLUME ACHIEVED (fe)l
0
0
0
0
0
0
TP LOAD AVAILABLE FOR REMOVAL (Ib/yr)
D.00
0.00
0.00
0.00
0.00
0.00
TP LOAD REDUCTION ACHIEVED (Ib/yr)
D.00
0.00
0.00
0.00
0.00
0.00
TP LOAD REMAINING (Ib/yr)
0.00
0.00
0.00
0.00 11
0.00
0.00
NITROGEN LOAD REDUCTION ACHIEVED (Ib/yr)
0.00
0.00
0.00
0.00
0.00
0.00
Total Phosphorus
FINAL POST -DEVELOPMENT TP LOAD(Ib/yr)
1 11.42
TP LOAD REDUCTION REQUIRED (Ib/yr)
0.79
TP LOAD REDUCTION ACHIEVED (Ib/yr)
0.00
TP LOAD REMAINING (Ib/yr):
11.42
REMAINING TP LOAD REDUCTION REQUIRED (Ib/yr):
0.79
Total Nitrogen (For Information Purposes)
POST -DEVELOPMENT LOAD(Ib/yr)
1 81.67
NITROGEN LOAD REDUCTION ACHIEVED (Ib/yr)
0.00
REMAINING POST -DEVELOPMENT NITROGEN LOAD (Ib/yr)
81.67