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Source PW is Facilities Manual, Vol. III, Fairfax Co., Va., 1976 S ' late 3.38-1 SHEET INDEX
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SHEET 1 PRE -DEVELOPMENT CONDITIONS
v,V SHEET 2 STORMWATER MANAGEMENT PLAN
�,. 100 -YR FLOOD
LIMITS, TYP.
DRfR,,LINE MA
MA FEMA
PROTECTIVE DEYICEFFMA i
,
4,.
MAXIMUM LTMP 76M2 -1-D
NDGR DWILLOUGHBY PROPERTY OWNERS ASSOCIATION, INC.
". CLEARING AAI
"` 4 ',
APPROVED
ZONING: PUD
PROPOSED GRADING ` , by the Albemarle County
. e fi
:. `N 3 s _. 3 ity ?1c , :'1,?!"11 Department
�P N': D.B. 1160 P. 408-409 PLAT uMn
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C
a o
:.. WHERE DRiF�L1NE gyz'a ��; `i
4 " IS LESS THAN "` .
CONSTRO
jA)- 0PERAT10N'RELATIVOPEN SPACE WILLOUGHBYTO `I,HE LLJ' ! F PROTECTED TREES ......, _..,..._. SECTION 5 PHASE Ill
DETAIL
...............
HATCHED AREA _._
n Cnn CQCAITC AnCA nE
0 10' 20' 40'
80'
TERRA.
CONCEPTS, P.C.
2046 ROCK QUARRY ROAD
LOUISA, VTRGTNIA 23093
PH. 434-531-3600
mkeller�terraconceptspc.tx3m
Alan Franklin PE, LLC;
Civil and Site Plan Engineering
427 Cranberry Lane Crozet, VA 22932
434-531-5544 j
elan@alanfranklinpe.com
te�r---'"'-
Allan 0,-- ranklin
Lic. No, 35328
ONAL
ISSUED: 11-22-17
SCALE:
REVISIONS:
1.03-05-18 - REMOVE EXTRA PVMT &
RELOCATE LEVEL
SPREADER
SHEET
anMEMMMIR
TMP 761VI21�D
VWILLOUGHM" JPROFTRTY OWNERS ASSOUrRf ON, INC:
ZONING: PUD
D.C. 38.1. R 133
1160 P.,W9409 PLAT
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,
e
.° SITE DRAINAGE AREA, TYP,
'•� , k�,x, "x.:. OPEN SPACE LV 11CUG? EY'
....,^...._ SECCir3N5 PHASE ill
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STORMWATER MANAGEMENT CALCULATIONS
PRE -DEVELOPMENT RUNOFF
(Site Drainage Area to Moore's Creek)
D.A. = 1.54 Acres
tc = 5.80 Minutes
CN = 65
QmPre-Developed = 1.19 cfs
RV(1)Pre-Developed = 2,464 cf
Q(2)Pre-Developed = 2.04 cfs
Q(10)Pre-Developed = 5,36 cfs
Q(100)Pre-Developed = 12.58 C- S
VSMP CHANNEL PROTECTION CRITERIA
POST -DEVELOPMENT RUNOFF
(Site Drainage Area to Moore's Creek)
D.A. = 1,54 Acres
tc = 5 Minutes
CN = 70
Q(1)PostDev = 1.87 cfs
RV(1)Post Dev = 3,548 cf
Q(2)PostDev = 2.91 cfs
Q(10)PostDev = 6.70 cfs
Q(100)PostDev = 14.59 cfs
Post -Development stormwater is converted to sheet flow via a vegetated lip level spreader to the existing vegetated stream buffer
and 100 -year flood limits of Moore's Greek. The watershed for Moore's Creek at the property is approximately 15,000 acres. The
contributing project site drainage area (1.54 acres) is less than 1.0% of the total watershed of the receiving channel; therefore,
the VSMP Channel Protection Criteria and Flood Protection Criteria is satisfied.
Moore's CJ§ek
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POST -DEVELOPMENT DRAINAGE AREA MAP.
Virginia Runoff Reduction Method ReDevelo ment Worksheet - v2.% -Sunt 2(014
To be used wit DRAFT 2013 BMP Standards and Specifications
Site Data
Proiect Name: ViroiniaAsohalt
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Land Cover Summary 11 isted Adjusted' L'. and CoverSumman+ Lantl Cover 5ummanr
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Near In
TERRA
CONCEPTS, P.C.
2046 ROCK QUARRY ROAD
LOIRSA, "VIRGINIA 23043
PH. 434-531-3600 �
mlkellertter-fit eptspacxrm
Alan Franklin PE, LLC
Civil and Site Pian Engineering
427 Cranberry Lane Crozet, VA 22932
434531-5544
alan@aianfranklinpe.com
Alan G, Franklin
Lic. No. 35325
ISSUED; 11-22-17
SCALE. AS SHOWN
REVISIONS:
1.03 -fly -18 - REMOVE EXTRA PVMT &
RELOCATE LEVEL
SPREADER
I SHEET
RoDevtloprnent
'.:
Trearm eort \'alarne
Pr,ft- Developm cut Treatment
-
PreDevelopmentTieatmentVolutne(acre-ft LgtB3
Qgt3q
jaccre¢)
Uq1 lT
Yolurne'acrett
OAZ$0
paost
PeDeveloprnent
Fr�Ce"delapment Tn_atm ent Nnlime
TrtrnertVolu
Past-DevelC,prnerlt Tleatm t
feet 98
5ffi
tropic feet
t'6
Volume(cubicfeed
qq0
P'USt-
PeDavel upon tort
Pre Development Load (Tr)(IbfyrJ t]fi
0'36
Lmad(TP)(ICayr)
0,'6
Fust-Developm crit Load (iP)tlpfyrJ
'Adjusiet7 Land Cover Summary r2rlects the pre redevelopment
Nld,,Jmi ro `/ Redurtimri P.equired Below
hand cover minus the pervious land co. er(roresvopen space or
Pre-RetDi/do pment Load-
managedtun) acreageproposed for Tom impervious cover. The
adjusted total acreage is cot _istent with the Fort Redevelopment
TP Load Reduction Required for
TP Load ReduCSon Required for
acreage (rnlnas the acreage of ne,v impervious rover). The load
Redeverloped Area pbq+rl
D.tf
New lm pervious Area (Ib;yr)
6 ,1
reduction req arierr ert for the nmi,, irnpervious cover to meet the re,k
development load limit is computed in Column 1.
Total Load Reduction Required
,^,
TERRA
CONCEPTS, P.C.
2046 ROCK QUARRY ROAD
LOIRSA, "VIRGINIA 23043
PH. 434-531-3600 �
mlkellertter-fit eptspacxrm
Alan Franklin PE, LLC
Civil and Site Pian Engineering
427 Cranberry Lane Crozet, VA 22932
434531-5544
alan@aianfranklinpe.com
Alan G, Franklin
Lic. No. 35325
ISSUED; 11-22-17
SCALE. AS SHOWN
REVISIONS:
1.03 -fly -18 - REMOVE EXTRA PVMT &
RELOCATE LEVEL
SPREADER
I SHEET