HomeMy WebLinkAboutWPO201600057 Plan - Stormwater Stormwater Management Plan 2016-11-09of
ose
This WPO Plan
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tv� al dl 'L rbed area for these
Drive s s- b P ' ? I w t y review !�!dw 4�n �Y 2 2 1 `l° total
improvements
co .bi
with the
major site plan � �� � �I n willb ;yI,
total disturbed rr �for r the
The county
deter-r--ained thatthese
it I l a - meni ment become a co--e mo la.--- of
development and a WPO plain -
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j�p. �0 yp '% j " �p�p°� p�-�, ""y 1 1 .1.. 'i must
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site
?it(' {�j ry 1 P"" 'l / �J review
`i �I `*�' 7' approval.
'is 6S..S s u .JJ .:�� t L w rI f o I r e i �r MI'�7 and.
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C-!A,o -SCALE Imo^
CMAURLOTTESVII EA
ASSOCIUATION OF
,T'(eO S
COUNTY OF
i
4
3
New � I
2I—Unit Addition
Ant Floor FEE=423.63
Second Floor
EEEm437.50
o:`rEs,yN�y
t° �✓ J> New Storm Water i ✓,
> Management Easment.
iROSEWOOD VILLAGE C �' � � ✓
1 ZONING- C1 ����� -Tempo Con3truoil�on ,'� ��N /`� /✓✓
2,07 Acres Eaaement ,� /` ✓/ t °
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~ ~` Virginia Power EaserTnentl--"�----" � { ✓: � ��� tt ` �d .i /�J i
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40' O 40' 80, 120'
SCALE: 1 "=40'
WPO-2016-00
N T P--- LAN
TO R M W A T 1E- i -R,,�, MANAGELiM L,�
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NBRIE
R Fi' IT'
0SE,W00D VILLAGE A-iL kir -J J-1i
TAX MAP 61W' PARCEL 2-1
RIO DISTRICT, ALBEMARLE COUNTY VIRGINIA
- - -- - -----
sITE DATA
SITE PLAN NUMBER-
NOTE -
LEGAL REFERENCE-
PARCEL ADDRESS:
SOURCE _ OF TITLE:
O'1NER
CURRENT USE:
PROPOSED USE;
MAGISTERIAL DISTRICT.
BUILDING SETBACK:
PARKING SETBACK:
SDP2000-00012, SOP2001 —00002, SP200200018, SP200800; 8, SDP201504041, SDP20'1600027
THIS SPECIAL USE PERMITS WERE APPROVED BASED ON THE FOLLOWING CONDITIONS-
1) THIS SPECIAL USE PERMIT AUTHORIZES AN ASSISTED LIVING FACILITY.
2) MAXIMUM USAGE IS LIMITED TO NINETY (90) RESIDENTS IN THE FACILITY.
001 WO--02-00-00"100
500 GREENBRIER DR
CHARLOTTESVILLE, VA 22901
DO 1775 PAGE 520
ROSEWOOD VILLAGE, LC
SVII LE, VA 2290'1
CHARLOTTE
Cl—COMMERCIAL, AIA--AIRPORT IMPACT, STEEP SLOPES (MANAGED AND PRESERVED)
ASSISTED LIVING
ASSISTED LIVING, PHYSICAL THERAPY/MAXIMUM IMPERVIOUS COVER-6,700SF
am
30' MAXIMUM
10' MINIMUM
'10' FROM PUBLIC RIGHT--OF—WAY
310' FROM RURAL AND RESIDENTIAL DISTRICTS
SOURCE OF BOUNDARY: PLAT RECORDED INN DB 816 PAGE °',99
SOURCE OF TOPOGRAPHY: 4—FOOT CONTOUR INTERVAL FROM A1U-.1,:''1,ARLE COUNTY GIS MPS (USGS DATUM).
2—FOOT CONTOUR INTERVAL FROM FIELD RUN SURVEY BY MERIDIAN PLANNING GROUP, LLC.
ON JULY 14, 2015
2—FOOT CONTOURS ALONG HILLSDALC DRIVE WERE OBTAINED FROM ROAD PLANS. TIDE EXISTING
CONTOURS SHOWN ARE CURRENTLY UNfff-R CONSTRUCTION.,
PARKING SCHEDULE:_
REQ. FOR ASSITED LIVING; 1 SPACE PER Sa UNITS=81 UNI fS/3m 27 SPACES
REQ. FOR PHYSICAL THERAPY: 1 SPACE/200Sr =150SF/200 SF e I SPACE
PROVIDED 34 SPACES
SWM VOLUME CONTROL-
SWM WATER UAL Ll7Y-
WATEeR SERVICE,
SANITARY SERVICE°
RESERVOIR WATERSHED:
LIGHTING -
4,
q
STORM WATER DETENTION BASIN
OWNER SHALL_ PURCHASE NUTRIENT CREDITS
ALBEMARLE COUNTY SERVICE AUTHORITY
A L B -MARLE COUNTY SERVICE AUTHORITI
APPROVED
by th /,,:::: : _;de County
Community Deve,upment Department
File
THIS PARCEL IS NOT LOCATED WITHIN k' PUBLIC 'CATER SUPPLY RESERVOIR WATERSHED,
NO NEW OUTDOOR LIGHTING IS PROPOS?D
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CTVICINITY MAP
C�O01 SCALE.--1 sa` 1000'
jJ-1E T INDUC
C-400 .........
COVI� R CIE
C-401 .........
ENI I I10 �,�ONTD` ITIONS DEIVIOLITION PLAN
C-402-......
SITE PLI1 N
C-403 ........
GRADING AND UTILITY PLAN
C-404 ........
:STOFMWA ER DETAILS
C-405 ........
STOPM-MTER QUALITY CALCULATIONS
C-406 ........
STORINJP�IA.TER RUINOFF CALCULATIONS
LEGEND
LP
L IGJ,T POLE
I E>
TO BE RELOCATED
BUILDING SETBACK
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SHEET NO.
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TW-437.00
4 7.0 BIP/=423.70
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423.7( /=423.35
. . . . . . . . . . ... New Retaining Wall
Max Heighit=14,1)'
437. 0`
EX n
Exist.
Par300king '7
- - ---------
/New Asphalt Pavement 21 -Unit �Ad_ditjon
First Floor FFE=4�16
S 4�7.
econd Floor FFE7,
4
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2- rqE_
Limits of Disturbance
Area A 29 Acres
0
_7�
Exiting Iatprai I "i
-3—
60 Unit �bv 6,31;
Bulding NAV44
0 New 12" Of Sleeve 't�
New Retaining Wall w/Handrail v
Max Heighi=6'
/x
TW28.0
Limits of Disturbance
81 Tq 23.8
Area B ;b",
.20 Acres
me
41 TV/26.0 yi x + /
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101illowleaf Contoneaster
tinsin
(Cotoneaster salicifolius) shall be
--TC21 planted on slopes greater than 3: 1,
Shrubs shall be planted at a maximum Limits of Disturbanc,
of 5' on center. Area C .20 Acres--
--1A
ant V NI
M X/
locuted-' ?
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41 x —New Rip Rap
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SHEET 4 of 7
ilne r Developirrient rp lei `
Site Information
!Post -Development rol
c(Trea timent.Volume and Loads).
Enter'Total Disturbed -Aria acres -47=
Annual Rainfall firichesl
43
'Tar
rget Rainfall Even (inches)
cal Pbos hatu_ ; T PA E
Nitrogen (TN) EIVIC {mg
Totaij
i i unitless correction factor;
D. 0
Vey' uml yntary-pr
Forest/open Space eraeS)Ni
% Forest
Man -aged Twff Ower (acres)
Ma aRed Tun
d pervious Cover (a ryes)
Rv(imper vious)
Total Site Arm;i: a+t.Trs�)
it-P
a 1xaJ�J€ri Volume
(cubii feel)
1-P Load
iIbANT)
Pre- ae e;aelu p r r�en=`_ P Load ;per a c r 4
{I'a��air2f "fir
ae#an W - I_aadIr)
(0 to ;€a
a 1ba/acre jr applied tre-redevelop�e c sert area lod€rig. perAr€sou
lard proposed for ne- - irrpetvi is crtrerj
Adjusted Land gver ummar
Pry Pervious l rz � ����r �; �r���r�� era J Ott � or
managed tur t" t ��.tY posedfor a?�'�9iJ111;3?'l��r't, us cover.
Adjusted t ttxl a ret7 e r,' consistent 3cr'e� e d car3J
acrecige Q{ new impe v#bas fovea)..
Column 1 shows load reduction fewin'ementfiolnew i . r, 1p, e r V 10 us co ve r b a s e o n
n ewdevelopmentfood t'lrnit, 0.4: lbslacrelyert }:
A
'M.P Dtmign List. 2013 Deaf Stds &Specs
Line' —if project y", IN a
Ltyn, d cover areas ontered cor ectly> V
disturbed area, entered?
i
B Soils D Bois
Space
92
—
l.�a �dy
� �. �, _ <
1trpetsoavJsp3
�S
LandCo" r Yr'- g61,'P t
an S Elm
Cover 'acires''I
F °est
1i`9anaged Tu Ff Cover
1i'168bt 1,RY (turf)
Managed Turf
lmpervlo >s cover
(acres)
Rvlimpervious)
Final Site Asva (a es)
Final Post nev Site 3 'V
Treatment Volume
Rn'4 Pn �
-load
Load'per acre
rJ
__.. s � Ld r of Sum, ... __
Fomst.s,
co3}e (arres f Sa d,�i tea t�# xr 3a.{�sk'.m c,�y Fv� ou�a�9''�f s`<K ' s•`<�f ra�7,32:�`'o`�7.s` `t�
% Forest
Nla nagged i Jr3' Cover
Weighted RV (turf)
RALDV2Y-Slt R>i
>n� ?r
�s Ja3#rrJrr�
XXX
r:
;1
1T-w31t
t.
4 EtlblICfeet)
I
�; �si��� feet)
fj
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Lad `API
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P
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i
rfl5i ReDe51eimefisTr
Load per aey
e \`
���J3 Jar
RaDe-velomm 1-nad)
TP Lose RedlAction
R u1red ` 0r
Redeveloped Ares
TP Load locti-Lin
Required for New
Site Results (Water Quality Compliance)
r RESTI PE SWAGE (m
1 ' 1 US C0 VER .lac
IMPERVIOUS COAT R TREATED )err.
MANAGED TURF ARFA'Jat
MANAGED TARE A'' EA rR FEE' (m
AREA 0-1ECK
Site Treatment Volume )
Runoff Reduction olu and TP By Drainage Area
RUNOFF REDUCTION VO- LUM F ACHIEVEE
I P LOAD AVAILABLE FOR REMOVAL
TP LOAD REDUCTION ACHIEVED
TP LOAD REIVIAINING
Total Nitrogen (for Information Purposes)
PMP
NITROGEN LOAD REDUCTION ACIAIF-"VFD (lb/yY)
REMAINING POST-I)EVELOPMENT NITROGEN LOAD flblyr)
Ox. 0K. VI 0 ,
STORM WATER QUALI TY NOTES:
1 o The Owner will purchase 0.4.8 lbsr of nutrient offset credits.
io �
�`, verification
���i�n l� _��,r �o provide d Linder s Jperg --
A. F
AREA CNE(CK
51 m
! OK'
�i' 80°0
SCALE, 1" - 400 SCALE: 1 s'- _
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SHEET 6 of 7
CHANNEL PROTECTION COMPLIANCE SUMMARY TABLE
Appflcabie charnmao Protection Criteria
i I -YEAR STORM EVENT ENT 10-YEAR STORM Q/FNT 100-YEAR STORM EVENT
Ateria C' 1-YEAR ST.O.R-M... EV' AED RESULTS
Input Data. __j---"(EAR U
,C' o n d 1 o D z GAWW 8 C Rainfall Distribution Type: Type 11 Input Data: Input Data: Input Data: __RO 4
D 1 ';'c ha r a 'fill th in Rainfall Distribution Type: Type 11 Rainfall Distribution Type: Type 11 Rainfall Distribution Type:
of PPOT.-It Rainfall Depth- 150 in Type H Inflow Peak Flow:. 3.77 Cfs
� 3 Zan atOase Flow. 0.00 efs 5.60 in Rainfall Depth: 7.30 in
Qpfe. RVpra- developed X Rainfall Depth: 3.50 in Rainfall Depth:
f Odeveloped RVdoveloped Q pre -develop ad "� Inflovi Peak Time: 12.20 hr
Base Flow: 0.00 cfs Base Flow: U0 CfS Base Flow. 0.00 cis '3
developed developed RVdaveloped la/P Interpolation: Off Routed Peak Flow:
Q 2 cap V2 V'11""bl. vilth d 'Sign 0
RVore-developed .... Z51 CfS C-) i�j
Y la/P Interpolation: Off IuIP Interpolation: Off In/P Interpolation: Orr Routed Peak Time: � ...... 12.30 hr
Name Area CIN Tc Tt Maximum Pond Storage: ... 0,031 ac-ft Al
Restored 0 YES 2 51 138 0.8 1.64 4,46 5 4�54 (Acres) (hr) (hr) Name Area Cif TC Tt Narne Area CN TC_ R Name Area CN TC Tr Maximum Pond Elevatiom.... 411,51 ft
DA-A 1.66 80 0.18 018 (Acres) (hr) (hr) (Acres) (hr) (hr) (Acres) (hr) (hr)
DA-X 1.66 82 0.18 0J8 DA-X 1,66 82 0.18 0J8 DA-X 1.66 82 0.18 0.18
Channel Protection Criteria
A. The store water conveyance systarn convoys the post -development peal(flow rate from ffie two-year 24-hour, storno event without causing erosion of Computed Result&-
the system (NJ2 must be shown to be noComputed Results:
neon -erosive) Peak Discharge (Qp): 3.46 cfs Computed Results: Computed Result'
El The development project, in combination with other sibormwater runoff, is consistent with the design parameters, of the restored stormwater conveyance Time to Peak: 12.20 hr Peak Discharge (Qp): 3,77 cfs Peak Discharge (Qp)., T65 cfs Peak Discharge (Qp): 10,98 cfs
R RQUTEQRESULLS
and the restored storrnwater conveyance system is functioning as designed Time to Peak: '12.20 hrs Time to Peak: 12,20 hrs Time to Peak: 1Z20 hrs
Runoff Volume: 0,14 acre-ft
C. The discharge from the development satisfies the Energy Balance requirement
Runoff Volume: 0:16 acreire-ft Runoff Volume: 032 acre-ft Runoff Volume: 0.46 acre-ft Inflow Peak Flow:__ ....... 7.65 cf-5 a(0C)l <
(Qdeveloped x RVdeveloped) = IF (CIPre-developedx RNIF,re-daveloped)
where: Inflow Peak Time: .... ... . .... 12.20 hr 7
QdevQlcped the peak flow rate, of runoff from the developed site Routed Peak Flow: 7.05 cfs M
based on developed conditions 1 z <
Wdeveloped the volume of runoff from the site I Q-AEAR STORM EVENT Routed Peak flime: 1122 hr 0 z 0 0
13 an improvement faator (0.8 for site; > I acre, 0-9 for sites 2� 1 acre) 1 M V)
Input Data-. Maximum Pond Storage: ..... 0,0533 ac-ft 0
QPre-develcped the peak flow rate of runoff from the pre -developed site <
RVpre-developed the volume of runoff from the site based on dire -developed conditions Rainfall Distribution Type- Type 11 Maximum Pond Elevation: .... 412.30 ft
Rainfall Depth: 5.60 in Drainage Area B
Drainage Area A B soll Is C Soils D'Solls A -soils B Soils C Soils So-Iis
W
I \gn"T.
I'M MIA
-(.1, forestlopen Base Flow: 0.00 _'fS
�A-P�_(�q_ res) 1�
re- p� 1111111 "', , , 11" , F( )resfJOpen Space undisturbed, protected for%t/open Area (a
_gr, t , '. 111111 1 , WNW, Nil
Forest/Open Space undisturbed, proli cres
sp-ace or reforeste' land CN0 56 70 la/P Interpolation: Off space or reforested land 30
55 -70 771
W ........... 1'11'1."i'';
M
Area (ac Managed Turf - di turbed, graided for yards or other turf to be Area nes
�11 1""', \0
Managed Turf - disturbed, graded for yards o- rother W6 to be re-S) 7= 11 1 111 , ..' R SYV Ate-
011, 011\1 15
'N
, . I : I � .":':
74
CN
39 Aftanaged 39
Name Area CN TC Tt '100 '�Q
movie --YEAR- RESULTS
(Acres) (hr) (hr)
r :A�%'g "N M M
Area (ac s
A
IN
Area (acre
DA-A 1.66 80 •0.18 0.18 Impervious Cover Inflo Peak Flow:,_ ... 10.98 Cfs
aq 98'' CN 98
lmpenAous GGA'Jer
CN Inflow Peak Time: .... ... lZ20 hr
Computed Results: Weignted CN S Routed Peak Flow, 10.87 cfs
g-mmigg g,
g
Peak Discharge 00: 7.10 cfs Routed Peak Time: 12,20 hr
�E
I -year; Acl arl storms 1.0-yea r -sip rrn, Time to Peak- 12�20 hrs 1-Ye a r storm 2-yea r stonTii -year stom� 4 Maximum Pond Storage:_,., 0.0587 ac-ft
MIT", v�
0'.01
ut.
(m) %irithsio RAM-ff Reduction, W'1Dev,_1,Dp,�d (in) with �no Runoff Red I U
Ww"M 0
Runoff Volume: 0.14 acre-ft Maximum Pond Elevation-- 412.45 f It
)w' n ion R1 �Iopcdfln Ith Ruroff Roducb �z
(j"� WiJ 'NReduituoill
Rifflol
18•62 M
Adjusted CN
-A
Adju4ed CINs.I'LEM
r :1
1V 116 1 el 4 'V�l
CY) n
rl- C)
3
0
IIJ
IN
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-Pl-f\IE-DEVELO'-')M,F-!,,I'f'DRAINAGE AREA
25' 0 25' 50'75'
SCALE: 1 5
POST-DEVELOPMENT DRAINAGE AREA
SCALE 1 " = 25'
25' 0 25' 50, 75'
-406
SCALE: 19'=:25'
SHEET 7 of 7