HomeMy WebLinkAboutWPO201200046 Plan - Stormwater 2012-05-21PHASE 1 0F
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WPO: SWM - ES&C PLANS -AMENDMENT
LEGEND
W
WATER LINE (EX./ PROP.)
— - - - - — BOUNDARY/ RIGHT-OF-WAY LINE
WV® WMO
WATER VALVE/ METER
I.F. IRON PIN FOUND
FHA �
FIRE HYDRANT
I.S. IRON PIN SET
YH <5-
YARD HYDRANT
— — — — — — SETBACK LINE
BOA ®
BLOW -OFF ASSEMBLY
- — — — — — — - EASEMENT LIMITS
SS
SANITARY SEWER LINE (EX. / PROP.)
— CENTERLINE
CO o
CLEANOUT
f 70 CONTOUR LINE (EX. / PROP.)
MH--
MANHOLE
(--3:-1-- F2.50% DEGREE/ DIRECTION OF SLOPE
_SD—
STORM LINE (EX. / PROP.)
479.70+ SPOT ELEVATION
DI c-50-1
STORM INLET
HP HIGH POINT
YD ®
YARD DRAIN
LP LOW POINT
DS o
DOWNSPOUT
- — - DITCH / SWALE
G
GAS LINE (EX. / PROP.)
_ _ = WATER COURSE
GV® GMO
GAS VALVE/ METER
BM+ BENCHMARK
OHE
OVERHEAD ELECTRIC (EX. / PROP.)
CG -2 VDOT STD. HEADER CURB
UGE
UNDERGROUND ELECTRIC (EX. / PROP.)
CG -6 VDOT STD. CURB & GUTTER
CG -12 VDOT STD. HANDICAP RAMP
PPO
POWER POLE
HC HANDICAP PARKING SYMBOL
LP*
LIGHT POLE
DIP DUCTILE IRON PIPE
GUY
GUY WIRE
RCP REINFORCED CONCRETE PIPE
EM o
ELECTRIC METER
CMP CORRUGATED METAL PIPE
TRANSFORMER
PVC POLYVINYLCHLORIDE PIPE
OHT
OVERHEAD COMMUNICATIONS (EX. / PROP.)
HDPE HIGH-DENSITY POLYETHYLINE PIPE
UGT
UNDERGROUND COMMUNICATIONS (EX, / PROP.)
VC VITRIFIED CLAY PIPE
PED ❑
UTILITY PEDESTAL
FFE FINISHED FLOOR ELEVATION
SWM/ DWM q16-6
SINGLE/ DOUBLE WATER METER
SINGLE/
TO BE REMOVED
TBT TO BE TRANSPLANTED
GV 04
GATE VALVE
TBS TO BE SAVED
BOA o
BLOW OFF ASSEMBLY
Y 2, 2011
PREPARED BY:
Alan Franklin PE, LLC
Civil and Site Plan Engineering
427 Cranberry Lane Crozet, VA 22932
434-531-5544
alan@alanfranklinpe.com
APPROVED SITE PLANS PREPARED BY:
VICINITY MAP
1"= 60'
0.
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CONCEPTS, P.C.
PH. 434-531-3600
SHEET INDEX SEAL
SHEET 2 SWM: PRE -DEVELOPMENT D.A. MAP
SHEET 3 SWM: POST -DEVELOPMENT D.A. MAP
SHEET 4 SWM PLAN: WATER QUALITY/BMP MAP LTH OF GI
BIO -DETENTION P ND DETAILS
r
SHEET 5 SWM0 SHEET 6 EROSION & SEDIMENT CONTROL PLAN ZONE B -STAGE 1 �
SHEETS 7 EROSION & SEDIMENT CONTROL PLAN ZONE B- STAGE 2 Alan G. Franklin
SHEETS 8 EROSION & SEDIMENT CONTROL NOTES & SEQUENCE Lic. No. 35326 w
SHEET 9 EROSION SEDIMENT & CONTROL DETAILS
EROSION SEDIMENT & CONTROL DETAILS o� ~�
SHEET 10 s Cs
sI ONA L '�
APPROVALS
PLANNING/ZONING
ENGINEER
BUILDING OFFICIAL
ARCHITECTURAL REVIEW BOARD
FIRE OFFICIAL
ACSA
VDOT
REVISIONS
REV DATE DESCRIPTION SHEETS REVISED
1 08/02/11 COUNTY COMMENTS 6-10
APPROVED FOR CONSTRUCTION
1 05/04/12 LETTER OF REVISION #1- ADJUST STORM "P" FOR ROCK
APPROVED
Dab 6% z - ' I- Z o I Z
90 Z-01 i v oo +�l b
FILE COPY
1,3,4,7 This dopy of the approved plan is
reserved for the official files of
Albemarle C:,u,jtV. Please do not
remove this plan from the fle.
►Ian Franklin PE, Lb
Civil and Site Plan Engineering
427 Cranberry Lane Crozet, VA 22932
434-531-5544
alan@alanfranklinpe.com
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Alan G. 1dl1�1I1
Lic. No. 35326 W
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SCALE: NONE
ISSUED: 05- 02-11
REVISIONS:
1.08-02-11- COUNTY COMMENTS
2.08-16-11- COUNTY COMMENTS
APPROVED FOR CONSTRUCTION
1.05-04-12 - LETTER OF REV. #1
SHEET
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\ I. _,., ��- r , ,4:- :._ = ','`' ormw ion Co lianc
RATIONAL METHOD WORKSHEET ''I' I; ; St ater Detention e
Project: Willow Glen t 441'
%BIO -DETENTION POND �\ -__ ; _ __ +'
Date: 5/6/2008 :::_ -
1 1 t'� -''' Post Development Peak Discharge Analysis 2 yr storm
Designer: AGF
Drainage Facility
,,
, _
3 c es _ _ -
`; '* D.A. 2.0 Acres - "- ty ,' �,
\ t k.-` ,r-'"' - - _ - ' %" ;':, `4' `'' ' W menity Bio- Bio -Filter Bio -Filter Total
__
Watershed ID: Biofilter #2 �� ` _ !, _ " -- - - ,1 , 1`i,, �\ M/
`� \ �" C - 0.70 E •, _ �' _ :�- ti±. Time s PA P
\ -•
Drainage Area: 0.22 Acres \ ®`, -___/ _ __ _ - ..._ - _ ti(..-
---'-
". -
' �I -=
r.
-.
r r, -__.. _ .� .-_
c factor. 0.62 see worksheet)\
,� ` me on Detention o 2 pos Description
t \ ♦ _ \ /// , / - - - _ - _- - _~._ �;`,``, Ii't " �`, ,� �:R '`� minutes (cis) (cfs) (cfs) (cfs) (cfs} (cfs) - - - -
t� 5.00 m I ns. - _
tc: 5.00 mins. (see worksheet} _-
EERWQOD
_ ;
s € € 1, ; ''. 5 3 61 0 41 0 00 0 00 12 24 , 6.26 duration tc for No SWM, Bio Detention, & Bio Filter #, ,#2
'"'""- 10.75 1.04 0.61 0.00 9.25 21.65 duration = tc for SWM/Amenity Pond
0(2): 0.69 cfs = 1 _1------,� f'� i 'l a�
v. / , / _
1= ,2
(�2 eak 1.40 cfs " 16 11.02 1.19 0.70 0.07 8.08 21.06 critical dur Intim f
0(10): 0.88 cfs ! \ `C (p ) ;` ;f / r i' ' '. i duration a or Bio -Filter #1
\1_ BY 0TH N
�- , / ;trs: '.,rµ :: s_ a 0.48 0.25 critical duration time for SWM
/Amenity '' :i 33 11.40 1.41 5.38 18.92 cri I al o S /Amenity Pond
�� 10 (peak) - 2.53 cfs ,' :,.F ' L, ',.;h°'� �:.,�_ ,,':._„_:.._" _ w;=_ 11.0 .4 .4
Q (p ) �Y,. -- -.,,
f' ,. ��;, ,;,K ..;•,.,, t 36 4 1 3 0 5 0 25 5.10 18.63 critical duration f
`A.y' at'o a or Bio -Filter #2
r.': 28 1 5
'\ ,�_ `'Y'��. ,�' :.'.; •�., �;�� ,: ��- o e oBio-Detention B in
Time of Concentration Worksheet Weighted c -f i :,, s
actor Worksheet �- t ,- -� - �� '�'-;�-=-�---`�
I .,.. 0.38 0.23 4.22 17.56 critical duration time for as
' t ~ ? ,4 ''+ ' �' Q2 (post)= 21.65 cfs < Q re = 23.41 cis
a,
11 .1
s
/ . >
,, s
/ I
r
Flow Time Cover Type Area c __ ,_- 1 ; ~r� �' 1:a \tv' ,f�,�,(� 4 , 'L. t'�l"
Overland o YP ,r§~+
,.
A,. ..
'-'di
f
Source: Seelye Chart as modified in VDOT Drainage Manual (Fig. Paving/Rooftop 0.09 0.90 M ENITY POND SWM Af �'r•, ��--
/ f .-i`--'I. f :9 rf- ":� Y},� ..;i . �• ';- :s � i `"`_ "', ,":1 is r, ``.' �„'_..
- I I I . : I 1
1.5.1.1 on Page 1-13E) Developed Open Space 0.12 0.40 / ' "
�,,.•-- �..., � s:;,. •. : t; . • __.� .-��:rywi. F y�,;;,��---� ,.;I Post Development Peak Dischar a Anal is 10 storm
Notes: _ _ ,,,,,- - / .Y�, ., �i .:%,IS! '\. :.�..� +e�p�Is:�;i�.�� �:t' r "r' ,oto. ','
1 Length of overland flow alwa s <= 200 It f j D.A. = 17.65 Acres \ r ' r. i' ;Y: ;.'•ti ,� i•. rr,li� Drainage
/ � S�'`t.;, :�. " :;.,��.:, � `I";: a age Facility
2) Calculate a separate Tc for each ground cover condition along the flow path / - / �" '?'
/ I :h r% .,f,""•+'• Sid �, .1i `,
c -factor = 0.62 - � rxir. '.t,. %`` SWM/Amenity Bio- Bio -Filter Bio -Filter Total
--, e 0.67 /f i'-+" ::, .� Time Pond Detention #1 #2 No -SWM Q,o(post)
+Descrido
/ - - - � / I �}' ':•� 's$:" y a'1'<'•�,,,:; �. 'r:?. y:.`'` �t,: a ,;+::.
Strip Sample "C" values: ♦ �,; • :•�<",. a:'
25.00 Enter Length of St ft , _ I _.' '�. �'•� ` ttrt `<�§' min
P 4 utas cfs cfs fs (cfs) f`s
9 P 1 � C
25.00 Enter Slope % or ft/100ft) 0.22 Dense grass - / tc = 11.67 mins. _ _ _ _ _ - i (minutes)
( } ( } ( } ( ) ( ) (cfs)
_
/ 0.58 0.00 15.71 22.23 duration tc for No -SWM, Bio -Detention, &Bto-Filter #1,#2
0.90 Enter Rational Method "C" value 0.28 Average grass I % r '
/ / •wa, •is\)rf:t ;. if .•(, '.a '?j r.,
0.36 Poorgrass - 1 I �, Y-`` �.__t " �
. 1, ' ,..; 4A�:y;��• ;• ;t:: " � 12 15.01 1.45 1.08 0.25 12.09 29.88 duration = tc for SWM/Amenity Pond
g \ i 2 eak 1.40 cfs - \ r::..,
Q (p ) ;w,; 1; Ri
/ i +1 / '3Y;.. Tri:, .,�y .c ";{.. :,n;, "tit- ' ;tit;''; V
1.26 Result Tc minutes 0.48 Bare soil _ I'
(minutes) ------ _ I 1 :> -�, l :' `,x' 'p'° < "' 24 18.06 1.74 5
/, ,--v - x ... �. lar}` _ ;l p; y 0.78 0.45 8.7 29.78 critical duration time for Bio -Filter #2
I 10 eak = 18.99 cfs r !\ I ` *` ' N `�'''1'`''" :r a 42 18.99 2.40 0.57 0.35 6.40 28.71 critical duration time for SWM/Amenity Pond
0.90 Pavement Q (peak) /
Shallow Concentrated Flow Time 1/1"
/ r - \ \ +a,1; f ,. ;;" 't, ,.3; 52 18.86 2.53 0.50 0.31 - e t'o Basin
_v
\ • •,,, t 5.62 27.82 critical duration time for Bio -Detention i n
.',
_ ~- -
Source: SCS Velocity Graph as published In Virginia Erosion and --11.11- ----
,, �, ,. � I .. . 1„�, , � � »» Q post - 29 pre - .18
.88 cfs < Q 31 cfs
Sediment Control Handbook, Third Edition (Plate 5-2 on Page V-12)
- •1. • .;N ;
-
Notes: - _ n 1 . ,., _. _- ___ ._ _- ___ i ""/I---,1 I
4 >w. `"�. e / r--" / `-'�� J ''"'� , '.'v NO -SWM Det. I I I `' s Ids , f IF
1) Not intended for well-defined channels - see channel flow calculation - -,-_ `\ ,, / /i ,' .11 I I I '
2) Calculate a separate Tc for each ground cover condition along the flowpath - \ /;� hI \t ;.i ; ♦� 1 1 \ "11.
0.00 Enter Length of Flow (ft) I--' _"-- ~" ` / ' ;
pm - MOSPRISM-1,
4XF�► •, .
VA, 04
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Alan Franklin PE, LLC
Civil and Site Plan Engineering
427 Cranberry Lane Crozet, VA 22932
434-531-5544
alan@alanfranklinpe.com
LTH Op G
Alan G. Franklin
Lc. No. 35326 W
C) w,
IJILONAL
_
SCALE: 1"=50'
ISSUED: 05-02-11
REVISIONS:
1.08-02-11- COUNTY COMMENTS
SHEET
►Ian Franklin PE, LLi
Civil and Site Plan Engineering
427 Cranberry Lane Crozet, VA 22932
434-531-5544
alan@alanfranklinpe.com
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Alan G. Franklin
Lic. No. 35326 W
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SCALE: 1" = 50'
ISSUED: 05-02-11
REVISIONS:
1. 08-02-11- COUNTY COMMENTS
APPROVED FOR CONSTRUCTION
1. 05-04-12 - LETTER OF REV. #1
SHEET
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