HomeMy WebLinkAboutARB200900052 Legacy Document 2009-07-22 (3)Short Version BMP Computations For Worksheets 2 - 6
Albemarle County Water Protection Ordinance: Modified Simple Method
Plan: South Plains Water Resources Area: Development Area
Preparer: BCG Date: 16- Jun -09
Project Drainage Area Designation SITE AREA 202837 S F
64
T1-I` , \�
L storm pollutant export in pounds, L = [P(Pj)Rv /12 ) [ C(A)2.721
Rv mean runoff coefficient, Rv = 0.05 + 0.009(1) /'' ✓✓ -� '�:'' \
Pi small storm correction factor, 0.9 /y _ _ _
-
1 percent imperviousness
P annual precipitation, 43" in Albemarle
A project area in acres in subject drainage area, A= 4.66
C pollutant concentration, mg11 or ppm target phosphorus
f factor applied to RR
V required treatment volume in cy, 0.5" over imperv. area = A(1)43560(0.5/12)/27
RR required removal , L(post) - f x Qpre)
%RR removal efficiency , RR1001(post)
Impervious Cover Computation (values in feet & square feet) / ' , ��� , 'V
LOCATION 1�A
NTS
\\,\� SITE
GAP KE5WIGK q
,,o d
L
hem
pre - development Area post- development Area
Roads Length Width subtotal Length Width subtotal /
0 0 0' 0 0 0
0 0 0 0 TMP 80- °✓I
RA
0 0
0 0 SMITH OR ASHLEY WILLIAMS
Driveways Length Width no. subtotal Lo Width no. subtot
th al 0 0 WOODED/ FORESTRY EASEMENT
and walks 0 0 0 10179 0 0 0 10179 A
/ , p
0 0 0 929 0 0 . 0 64Z �� 4jb' 1 }�
0 0 0 10826 �P� i y' / / \? Z O �I I V O
Parking Lots 1 2 3 4 1 2 3 4
\ ,• T RA- RURAL AREAS
Gravel areas Area Area
21296 x 0.70 = 14908.6 21298 x 0.70 = 14908.6 � �� g \/ IF
Structures Area no. subtotal Area no. subtotal
1230 1 1230 3086 1 3086 P� / '
.,1856 1 1856 5265 1 5265' ,�1 �+'(� / ''' i , % , // I� ,/ ) j / \'� `_
0 0 0 3086' 0 8351 V- C
Actively - grazed pasture & Area Area / MA6NOLI� NEW FELLOWSHIP HALL SQUARE FOOTAGE 5,265 SQ. FT.
�/
yards and cultivated turf 199,751x 0.08 = 15980.08 168,751 x 0.08 = 13500.112 \fi /,' / / °' / / % X 157 I NO / � NEW FELLOWSHIP HALL HEIGHT °✓ ' -O° (3�✓'.O' ALLOWED)
Active crop land Area Area `\ J I f `t
x 0.25 = 0 x 0.25 = 0, t�
Other Impervious Areas - - / ' / F' `�< I N�
_ _ / // / \ -d ESTI NATED DATER USAGE
0 0 / \
Impervious Cover 20% 23% T/
/ dd /� T
tpre) i(post) '' / �/ ', //i % ' // %' // SP GE I / I T . 5Q I ,
Rv(post) V WEEKDAY USAGE 53 GAL /DAY
0.26 73.4 C.Y. 1983 c.f. PEAK USAGE (SUNDAYS) 810 GAL. /DAY
-y\
New Development (For Development Areas, existing impervious cover <= 20 %) % 2411 / I 1 S S�
C f I (pre) * Rv(pre) L(pre) L(post) RR % RR Area Type / �� `
0,70 1.00 20% 0.23 6.57 7.47 0.89 12% Development Area �' -' /� i' i / %1 i / BEE
I ' ��j ` �� ¢ F A R < N
_. / \
0.35 -1.00 0% 0.23 3.29 3.73 0.45 12% Drinking Water Watersheds \
0.40 1,00 1% 0.23 3.76 4.27 0.51 12% Other Rural Land PAVEMENT a, -/ ,I ' / I DO(7BLE I j TREE
min. values WIDTH �O J i / / MAPLE I I A G
/ ,� / I ;) I i 36" o O \ \ \ CURRENT U5AGE: TWO SUNDAY 5ER\/ICE5
Redevelopment (For Development Areas, existing impervious cover> 20 %) I / ( WHITE \ \, W I TH 70 TO 80 PEOPLE IN ATTENDANGE AND
C f I (pre) * Rv(pre) L(pre) L(post) RR % RR Area Type / ' '' I
, e 1 , , I 1 1 � I I I 1 ,OAK , C\1+ \ 6
0.70 0.90 20Jo 0.23 6.57 7 47 1.55 21 /o Development Area / ''' Cd ' ' ) \ - APPROXIMATELY THREE OTHER MEETINGS
/ /, S PER WEEK WITH LE55 THAN IO PEOPLE
0.35 0.85 0% 0.23 3.29 3.73 0.94 25% Drinking Water Watersheds 2 / � � i � / g' � ' � � � I I I I I I I , \ �
0.40 0.85 1% 0.23 3.76 4.27 107 25% Other Rural Land �� / , -'/ s I _ \ AT E -AGH MEETING. APPROXIMATELY
q" T.N1. �O I 36' 2
F/bRSYTHIA SPRUCE` I ASH G \ 45 EXISTING SPACES.
Interim Manual, Page 70 rev. 16 Feb 1998 GEB ✓/ / i ' i� I D.B. 8 \78 -8 P�f�T Q is
. 66 -4acl DESr. IPTION _y, \
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CORRUGATED \ t \ 1 \ I 1511
METAL
PIPE OAKE
HEMLO�K \ OGWOO % TMP 80- 22D
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HOLLY
, LINdi \T OP SPRINT \ 1 � I � 463 BLACK GAT ROAD
AGGLS EA\SEM�tlT I I �I / - RESIDENTIAL/ AGRICULTURAL EASEMENT
/ ---- - - - - -- _ \
\/ f \ 51" \ , PAVEMENT WIDTH
T
1
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RED OAK
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WILD Cu RIT
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WILLOW �; ` SOUTH PLAINS PRE5BYTERI N GHU H RG _
OAK '
cs� y 28' \\ MAPLE \ \\ 611 \ / \ \ ` \ \ 151I�" ,T \ \ ,\ D.B. 1878 -8 PLAT- - - - - --
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12 C2 \ \ \ BOX -
\ \\\ 36 \, \ \ \� \\ & \� \\ A A511 \ •\ ELDER ` \\ RE
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464 BLACK GAT ROAD \ K NP `
1 RESIDENTIAL/ AGRICULTURAL 5�T6 \ \ \ AB�o BrloN ELD� \ \ qm_, - - -- �\
SPV__1 \ �2 \ \ \ \ \\ \ ` \\ \ .\ > H KOR HIGKOR HICKORY V
RED \ t OAK \ \ \ 5YG`AMORf' \ - -- _ -
&U DOUBLE H KO -
\ \ \ - - -- -
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24 \` \`
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1 A5 `\ \\ OAK RED AK \
` VFW EDGE of \ °AK , ASH -� - _ TOPOGRAPHY BY: TRUELINE II SURVEYING INC.
\ \ 21413 MOUNTAINBROOK DRIVE
REDj
MAPLE V CHARLOTTESVILLE, VIRGINIA 224102
DATED 02/ 22 /Iqcicl
ECUNIDRY SURVEY BY: ROGER W. RAY 4 ASSOC., INC.
' �. 2� 1- 117 -IB ALLIED STREET
CHARLOTTESVILLE, VA. 224103
TMP 80- 114A DATED Oci/03/200,5
\ !i PATRICIA RINTELS
464 BLACK GAT ROAD DENOTES AVERAGE CANOPY FOR TREES
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