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HomeMy WebLinkAboutWPO200700108 Plan - Stormwater Stormwater Management Plan 2008-02-29law - - - - - I---- - - -W— BOUNDARY / RIGHT-OF-WAY LINE WATER LINE (EX. / PROP.) WVO WMO WATER VALVE I METER FHA -b- FIRE HYDRANT SETBACK LINE YH-�> YARD HYDRANT EASEMENT LIMITS BOA® BLOW -OFF ASSEMBLY SS— 4 SANITARY SEWER LINE (EX. I PROP.) CONTOUR LINE (EX, / PROP.) F--3:1--- <-2.507e- CO CLEANOUT SPOT ELEVATION MR.- MANHOLE SD LOW POINT STORM LINE (EX. /PROP.) DI STORM INLET CLARIFY LIGHTING DETAILS YD 9 YARD DRAIN BM+ D$o DOWNSPOUT VDOT STD. HEADER CURB CG -6 GAS LINE (EX. /PROP.) CG -12 —G— GVO GMO GAS VALVE / METER OHE— RCP OVERHEAD ELECTRIC (EX. PROP.) UGE— CORRUGATED METAL PIPE UNDERGROUND ELECTRIC (EX. / PROP.) POLYVINYLCHLORIDE PIPE PP,Cr POWER POLE VC LP� LIGHT POLE FINISHED FLOOR ELEVATION GUYS GUY WIRE TBT EM= ELECTRIC METER TO BE SAVED M TRANSFORMER _OHT— OVERHEAD COMMUNICATIONS (EX. / PROR) – UGT— UNDERGROUND COMMUNICATIONS (EX. / PROP.) PEDO UTILITY PEDESTAL SWM / DWM o/n SINGLE / DOUBLE WATER METER GV M GATE VALVE BOA o BLOW OFF ASSEMBLY ?= 300' I 'I — II FSK, I I - 51171 oil 181 . I I IF DM'T I N__ A S I T IF, " D V BOUNDARY / RIGHT-OF-WAY LINE -- I.F. IRON PIN FOUND I.S. IRON PIN SET ------ is SETBACK LINE J 4� u EASEMENT LIMITS 3 12/27106 RAISE RET, WALL TABOVE GRADE CENTERLINE 4 CONTOUR LINE (EX, / PROP.) F--3:1--- <-2.507e- DEGREE / DIRECTION OF SLOPE 479.70+ SPOT ELEVATION HP HIGH POINT LP LOW POINT DITCH / SWALE CLARIFY LIGHTING DETAILS WATERCOURSE ADJUST LANDSCAPE REQUIREMENTS CALC, BM+ BENCHMARK CG -2 VDOT STD. HEADER CURB CG -6 VDOT STD. CURB & GUTTER CG -12 VDOT STD. HANDICAP RAMP HC HANDICAP PARKING SYMBOL DIP DUCTILE IRON. PIPE RCP REINFORCED CONCRETE PIPE CMP CORRUGATED METAL PIPE PVC POLYVINYLCHLORIDE PIPE HDPE HIGH-DENSITY POLYE THYLINE PIPE VC VITRIFIED CLAY PIPE FFE FINISHED FLOOR ELEVATION TBR TO BE REMOVED TBT TO BE TRANSPLANTED TBS TO BE SAVED ?= 300' I 'I — II FSK, I I - 51171 oil 181 . I I IF DM'T I N__ A S I T IF, " D V s" CIVIL ENGINEERS LANDSCAPE ARCHITECTS 224 COURT SQUARE CHARLOTTESVILLE9 VIRGINIA 22902 P11. 434-295-4005 FAX 434-295-2103 I REVISIONS REV DATE DESCRIPTION SHEETS REVISED 0 11/6/06 INITIAL SUBMITTAL 1 12/14/06 1/9 ­�_ (�' — _1t1 e A- L ADD/S-RIFT PROP. LANDSCAPE AND SPECIFY RETAINING AND DUMPSTER WALL COLORS ---- ------- �4 ------ is 2 12/21/06 J 4� u Q 3 12/27106 RAISE RET, WALL TABOVE GRADE 4 1L _T ADD IS -1 LABEL ON STORM PROFILES 7 CHANGE RTE 240 PAVING SECTION N CLARIFY LIGHTING POLE HEIGHT CLARIFY LIGHTING DETAILS m --oz S-]�Oppj� ADJUST LANDSCAPE REQUIREMENTS CALC, 3 CLARIFY DUMPSTER WALL DETAIL 7 R L s tmpg- 5 01/31/07 ARB COMMENT - REVISE LIGHT FIXTURE LABELS C> EMERGENCY SPILLWAY CHANGES s" CIVIL ENGINEERS LANDSCAPE ARCHITECTS 224 COURT SQUARE CHARLOTTESVILLE9 VIRGINIA 22902 P11. 434-295-4005 FAX 434-295-2103 I REVISIONS REV DATE DESCRIPTION SHEETS REVISED 0 11/6/06 INITIAL SUBMITTAL 1 12/14/06 ARB COMMENT RESPONSE ADD/S-RIFT PROP. LANDSCAPE AND SPECIFY RETAINING AND DUMPSTER WALL COLORS LIGHTING REVISIONS 2 12/21/06 ACSA COMMENTS; EDIT NOTES, ADJUST HYDRANT LOCATION, UPDATE DETAILS 3 12/27106 RAISE RET, WALL TABOVE GRADE CHANGE GUARDRAIL TO HANDRAIL ADD MITIGATION PLAN SHEET ADD IS -1 LABEL ON STORM PROFILES CHANGE HC -RAMPS IN VDOT ROW TO CG -12B CHANGE RTE 240 PAVING SECTION MOVE PROP, POWER POLE OUT OF SIGHT LINE CLARIFY LIGHTING POLE HEIGHT CLARIFY LIGHTING DETAILS ADJUST LANDSCAPE REQUIREMENTS CALC, CLARIFY DUMPSTER WALL DETAIL 4 01/10/07 ACSA COMMENTS - REVISE OFFICE H2O METED 5 01/31/07 ARB COMMENT - REVISE LIGHT FIXTURE LABELS 6 12/17/07 EMERGENCY SPILLWAY CHANGES ALL 4,5,7,16,18-20 1-3,5,9,20,21 7 4,5 922 4,5 6i 18,19 18,19 16 7 5,21 19 8,12 CERTIFICATION OF C0M.ljDuLIANC� I CERTIFY THAT THESE FINAL PLANS MEET THE REQUIREMENTS OF THE ALBEMARLE COUNTY ZONING ORDINANCE, THE WATER PROTECTION ORDINANCE, THE SUBDIVISION ORDINANCE, AND THE DESIGN STANDARDS MANUAL, AND ARE PREPARED IN ACCORDANCE WITH THE ENGINEERING EXPEDITED REVIEW FINAL PLANS CHECKLIST. SIGNATURE DATE SHEET INDEX SHEET NOTES SHEET EXISTING CONDITIONS PLAN SHEET 4 SITE & PRIVATE ROAD LAYOUT & SIGN2, l"TE PLAN SHEET SITE & PRIVATE ROAD GRADING, DRAINAGE & UTILITY PLAN SHEET PRIVATE ROAD PROFILE, SECTIONS, DETAILS, & DESIGN TABLES SKEET SITE & RETAINING WALL DETAILS SHEET8 INLET DRAINAGE AREA MAP SHEET STORM DRAIN PROFILE, S & DESIGN TABLES SHEET 10 PRE -DEVELOPMENT DRAINAGE AREA MAP SHEET 11 - POST -DEVELOPMENT DRAINAGE ARE MAP SHEET 12 STORM WATER MANAGEMENT PLAN & DETAILS SHEET 13 STORM WATER MANAGEMENT DETAILS & COMPUTATIONS SHEET 14 STORM WATER MANAGEMENT COMPUTATIONS SHEET 15 STORM WATER MANAGEMENT COMPUTATIONS SHEET 16 LANDSCAPE PLAN SHEET 17 LANDSCAPE.DETAILS SHEET 18 PHOTOMETRIC PLAN SHEET 19 LIG14TING DETAILS SHEET 20 LIGHTINGDETAILS SHEET 21 WATERLINE PROFILES &DETAILS SHEET 22 SANITARY SEWER PROFILES &DETAILS SHEET 23 MITIGATIDN PLAN SHEET 24 EROSION & SEDIMENT CONTROL PLAN NARRATIVE & COMPUTATIONS SHEET 25 EROSION & SEDIMENT CONTROL PLAN, PHASE I SHEET 26 EROSION & SEDIMENT CONTROL PLAN, PHASE 2 SHEET 27 EROSION & SEDIMENT CONTROL DETAILS THop Lie. No. 35826 V� , r?. -o Z.`�IONAL �� 'TH op -V, Steven W. Edwards Uc. No. 0931 SCAM' 1)"-Ite 130P-Urtment PLANNING/ZONING ENGINEER BUILDING OFFICIAL FIRE OFFICIAL ACSA U10114111 CIVIC., ENGINEERS LANDSCAPE ARCHITECTS 224 COURT SQUARE CHARLOTTESVILLE, VIRGINIA 22902 PH. 434-295-4005 FAX 434-295-2113 JH Or jr j c� Alan G. Franklin Lic. No. 35326 �SrOi'VAL �� yTH OF Steven NV. Edwards Lc. No. 0931 SCIN SCALE: V = 30' ISSUED., 11/06/06 DRAWN BY: MOS REVISIONS. 4. 11-6-06, INITIAL SUBMITTAL 1. 12-14-05, ARB COMMENTS 2. 12-21-06, ACSA COMMENTS 3. 12-27-116, COUNTY COMMENTS 4. 01-10-07, ACSA COMMENTS 5. 01-31-07, REV. FIXTURE LABELS * 02-13-07, SITE PLANS APPROV'EI 6. 12-17-07, EMERGENCE' SPILLWAY CHANCES All fights reserved. No part of the material protected by this copyright (plans, ideas, designs, sections or details expressed on these plans) may be reproduced, changed or utilized in any form or by any means, electronic or mechanical, including photocopying, scanning, or by any other means of retrieval system without written permission from Terra Concepts, P.C. Also, these plans may not be assigned to a third party without first written authorization of Terra Concepts, P.C. ©TERRA CONCEPTS, P.C. 1310 -FILTER PLA LIST ,Label Scientificame CommonName Quantity Caliper Height Spread Root Comments CAmelanchier arborea'Autumn Brilliance' Autumn Briflance Serviceberry 3 7-8' B&B Mufti -trunk (3-5 trunks); dense, uniform branching E Acer rubrum'Red Sunset __. Red Sunset Ma le _ 3 2.5-3" B&B Straight trunk; branching begins at 4'; balanced head G Pia#anus x acerifolia 'Bioodgood' London Plane Tree 5 1.0-2" B&B Straight trunk; branching begins at 4'; balanced head H Itea virginica'Henry's Garnet Henry's Garent Virginia Sw eetspire 15 18-24" 3 G :All plants from one source; healthy color, balanced form; & O.C. J Aronia arbutifolia 'Brilliantissima' Brilliant Red Chokeberry 12 18-24" 3 G All plants from one source; healthy color; balanced form, 3'0.C. K Alex giabra'Dens a' Densa Inkberry 9 24-30' 3 G All plants from one source; healthy color; balanced form, 3 O.C. S2 Seed Seed 5200 seed (sf) Seed Mix #2: Ernmx 128 (Supplier: 1.800.873.3321) Bio -filter Mitigation. (VSMH Table 3.91.4 & 5) Impervious Area: 56,906.00 sf + 38,574 sf (TMP 56A2-1-31) = 95,480 sf (2.19 Ac.) Required (5%) Bio -filter Surface Area: 4,774 sf (A I Ac) Proposed Bio -filter Surface Area @ elevation 689: 5,846 sf {.13 Ac) Total Density (Stems/Acre): 400 Bio -filter Plants Required: 4,774 / 43560 *400 = 44 Bio -filter Plants Provided: 47 Equation: Divide the minimum Bio -filter Surface Area Required by 43,560. Multiply result by Total Density. This number gives you the number of plants required in the Bio -Filter. PLASTIC SOLUTIONS (540) 722 4694 OR EQll 48" TRASH RACK WITH LOCKABLE ACCESS HE 48" 0 PRECAST MANHOLE RISEf RIM ELEV. 690.01 12) DETAIL 6" TYP 15" RCP OUTLET aT]In FID 11r1E I 1 0 OFFj [j==OOFTF11❑ 683 • a 'a (2) 9"w x 4"h 687 ORIFICES W/ / TRASH RACKS 89 a INV. ELEV. 688.00 I ':D Y 'A -- — .--------692.5—{zz • a 'a . _ s 0 INV. 682.00 VDOT IS -1 REQ'D ° (INLET SHAPING) TYP. SECTION A, -A FI GLliVV 1 171E f\/1f a} ♦ 10 -YR STORM ELEV. 689.91 7 ORM ELEV. 689.19 2-YP ST 1.5 UNDERDRAIN GRAVEL (AASHTO M43, Y2"- 1") WRAPPED IN FILTER FABRIC 6" DIA NON -PERFORATED SCHEDULE 40 PVC PIPE @ 1% SLOPE (MIN) 9"w x 4"h ORIFICE W/ TRASH RACK A PLAN VIEW 48" 0 PRECAST MANHOLE .RISER w x 4"h ORIFICE 11 TRASH RACK PERFORATED PVC N PIPE @ 1 % SLOPE (MIN) E-068 N.T.S. IO -000 N.T.S. SEE POND CROSS SECTION - - - - -- -- - EX. EDGE OF CHANNEL -- -- JC AJL��0 -__ CREEK GEOE.CJ-IANNEL_ __ --- -- -- - s i :C,` . .nlc sY, l;,lca,J 115' CLASS I RIP RAP nY ��v t ��✓ n. LEVEL SPREADER.n - - — - - -_ -- SPILLWAY 1 t ' it --- 2 W X 4� L X 1 H CLASS I RIP RAP FILLED GABION BASKET ROW TO n} SERVE AS LEVEL SPREADER TOP OF BASKET ELEV. = 673.Q0 CLASS I RIP RAP -t `\ CHANNEL F F X E FFE 1ST 698.50 FIFE BSMT 687.25 II -f 2:1 698 9 SY CLAS I RIP RA (2' DEPTH) j ZA 1. l ' _ 679 681 683 -685 --- •-- - -- 687 3:1 / 89 t- 691 - Y 'A -- — .--------692.5—{zz 10' TOP OF EMBANKMENT = 692.50 692. . _ TRANSITION TO RIP RAP CHANNEL AT TOE OF EMBANKMENT MITER CUT 15" RCP OUTLET AND DISCHARGE TO CONCRETE CHANNEL INV. 681.00 SHALL BE PLANTED--" WITH SEED MIX #3 "" `--- GROUTED RIP RAP CHANNEL 3:1 ( _-680- --- - L-= 8' CO_NCRETE EMERGENCY \ SPILLWAY W/ 4:1 SIDE SLOPES \ \ SPILLWAY ELEV. 391.00 \\ POND RISER 2:1 o 967 ---- -- ---- -- - co 6-H I" Nim -PERFORATED PVA i -- --SLOPE MIN., -EYP. --- i' BASIN BOTTOM SHALL_ BE_P / 1 -EI -WITH SEED MIX —�'°" CO II-- --- - 7P 661 I -G Ili 1-C j/' CO_ — —611 p — — TED PV 1_°SLOTS i/ 1(� . + 10 Co CO z, « 7-1 I ,M _ 1-C � � 1-G \� II j CP 5-J �1-G ' 1 1 x..w i (-44 LX1 HC SSI 1 �\ IP RAP FILL-ED-GABION VDOT ST. E� 1 �'"� ` - Gl-__- (S/ I I ASKET RQA TO SERVE INV. OUT 91 0 <<r �, ' SEDIMENT FOREBA A$ Y 1 ---- - -- - ' — — —• 689- 9 89 9 SY 6bkss I R1P-RAP- 1 Y SLASS 1 RIP RAP (2' DEPTH) _- _ -691 2' - -- -- --- (2 DEPTH) _ _.__ _- --- ---------- _^RLL POND SLOPES__ 67 -+--SHALL BE PLANTED=-=► -- - -- WI _ - -- - -_ -- -- --- --- __ = --`--_--_ _—__ --_- —_- 699' NV�OUT 691.00 i -- - -- - - VDOT ST — T INV. OUT692.00 STRUREMOVE 15" PIPE TURE AND RESETROM IAT NE �� SEE OND CROSS SECTION REIMOVE 1 -5' -'PIPE FOM INVERTO SLOPE AND INVERT OUT TO BASSI STIRUCTURE AND RPESET AT NE SLOPS AND INVERTIOUT TO BASIIN I CJS JOINER , SIT. i �I TERRA CONCEPTS Poco CIVIL ENGINEERS LANDSCAPE ARCHITECTS 224 COURT SQUARE CTIA ©I TESVII I E VIRGINIA 22902 PH. 434-295=4005 FAX 434-295-2103 Alan G. Franklin Lic, No. 35326 d"V-tONAL Y� STH 0-r Steven W. Edwards Uc. No. 0931 �.� Al. v�SC�4. SCALE: 1 20' ISSUED: 11/06/06 DRAB BY- AGF REVISIONS. 0. 11-6-06, INITIAL SUBMITTAL 1. 12-14-06, ARB COMMENTS 2. 12-21-06) ACSA COMMENTS 3, 12-27-06, COUNTY COMMENTS 4. 01-10-07, ACSA COMMENTS 5. 01-31-07, REV. FIXTURE LABELS 02-13-07, SITE PLANS APPROVED 6. 12-17-97, EMERGENCY SPILLWAY CHANGES All rights reserved. No part of the material protected by this copyright (plans, ideas, designs, sections or details expressed on these plans) may be reproduced, changed or utilized in any form or by any means, electronic or mechanical, including photocopying, scanning, or by any other means of retrieval system without written permission from Terra Concepts, P.C. Also, these pians may not be assigned to a third party without first written authorization of Terra Concepts, P.C. © TERRA CONCEPTS, P.C. BIRCHWOODrev VA AlbemarleaA �'.� AS14 2- fear Dumtaon=55min, 1n&n=1.59in1hr Prepared by TerraConcepts, PC Page 1 TI-T--,d-r C,AT)® 1.00 s/n 002893 OO 2006 HydroCAD Software Solutions LLC -- 11/5/2006 Subcatchment 2S: Birchwood/US Joiner Runoff - 4,61 efs @. 0,10 firs, Volume= 0.368 af, Depth= 1.20" Runoff by Rational method, Rise/Fa11=1.0/2.0 xTc, Time Span= 0.00-3.010 firs, dt= 0.01 lags VA-Albermarle-ATLASI4 2 -Fear Duration=55 min, Intcn=1.59 in/lar Area (ac) C Description - 2.700 0.90 Impervious 0.990 0.45 Pervious Landscaped Area 3.690 0.78 Weighted Average 3.690 0.78 Pervious Area Te Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (efs) 5,9 Direct Entry, Pond 1P: Bio -Retention Inflow Area = 3.690 ac, Inflow Depth = 1.20" for 2 -Fear event Inflow = 4.61 cfs @ 9.10 hrs, Volume= 0.368 of Outflow = 141 cfs @ 1.01 hrs, Volume-- 0.244 af, Atten= 48"/0, Lag= 54.6 hails Primary = 141 efs @ 1.01 hrs, Volume= 0.244 of Routing by Stor-Ind method 'Time Span= 0.00-3.00 tars, dt= 0.01 hrs PeakElev= 689.19'@ 1.01 tars Surf.Area= 6,013 sf Storage= 11,705 of Plug -Flow detention time-- 53.7 again calculated for 0.244 of (660% of inflow) Center -of -Mass det. time= 43.8 min ( 75.8 - 32.0 ) Volume Invert Avail Storage Storage Description _- #1 68700' 31,174 cf Custom Stage Data (Irregular) Listed below (Recalc) Elevation SurfeArea Perini. Ine,Store Cuna.Store Wet,Area Qfeet (sq -ft) Qfeet) (cubic -feet cubic -feet) (sq -f) 687.00 4,702 286.0 0 0 4,702 688:00 59286 298.0 4,991 4,991 5,331 689.00 5,895 311.0 5,588 10,579 6,031 690.00 6,530 324,0 6,210 .16,789 6,761 691.00 7,189 336.0 6,857 23,646 7,472 692.00 7,874 349.0 7,529 31,174 8,259 Device Routing Invert Outlet Devices #1 Piimary 682.00' 15.0" x 54.0' long Culvert RCI', square edge headwall, Ike= 0..500 Outlet Invert= 681.00' S=0.0185/' Cc= 0.9430 n=0.013 #2 Device 1 688.00' 0.75'W x 0.33'H Vert. Riser Orifice X 2.00 C=0.600 #3 Device 1 690.00' 48.0" Horiz. Riser Limited to weir flow C= 0.600 #4 Primary 691.00' 8.0' long x 1.50' rise Emergency Spillway 2 Enid. Contractions) 4.0' Crest Height Primary OutFlow Max=2.41 cfs @ 1.01 bars HW --689.1.9' (Free Discharge) 1=Culvert (Passes 2.41 efs of 15.14 cfs potential flow) �-2=Riser Orifice (Orifice Controls 2.41 cfs @ 4.87 fps) L 3=Riser ( Controls 0.00 efs) -Emergency Spillway ( Controls 0.00 cfs) BIRCHWOODrev VA-Albemarle-ATLAS142 fear _ umtlon= 5 Sana, 1nten=1.59lh/hr Prepared by Terra. Concepts, PC Page 2 Hyd oCAD 90 8.00 s/n 002893 © 2006 HydroCAD Software Solutions LLC 11/5/2006 Pond 1P: Bio -Retention Hydrogrraph Flo Inflow 5 =mary Inflow Area=3.690 ac Peak Elev=689.19' 4 =11,705 cf Storage 1 Time (hours) Critical Durathon Analysts. 1 0 Event Duration (minutes) ® Elevation 13 inflow IN Primary BIRCHWOODrev VA-Albemarle-ATLAS7410 Year Durations 66.nrrn, 1nteaa=200In/lar Prepared by Terra Concepts, EC Mage 1 HydroCAD® 8.00 s/n 002893 ©2006 HydroCAD Software Solutions LLC 11/5/2006 Subcatchment 2S: Birchwood/US Joiner Runoff = 5.80 efs @ 0.10hrs' Volume= 13.551 af, Depth= 1.79" Runoff by Rational method, Rise/Fall=1.0/2.0 xTc, Time Span= 0.00-3.001aas3 dt= 0;01 hrs VA-Allbermrle-ATLAS1410-Fear Durataon=66 twain, Inten=2.00 in/lar ..Area (ac) C Description 2.700 0.90 Impervious 0,990 0.45 Pervious Landscaped Area 3.690 0.78 Weighted Average 3.690 0.78 Pervious Area Te Length Slope Velocity Capacity Description ('mina) . (feet) (ft/ft) (Wsec) (cfs_ 5,9 Direct Entry, Pond 1P: Bio -Retention Inflow Area = 3.690 ac, 'Inflow Depth = 1.79" for 10 -Year event Inflow - 5.80 efs @ 0.10 lams, Volume= 0.551 of Outflow = 3.15 cfs @ 1.19 hrs, Volume= 0.417 af, Atten= 46%o, Lag= 65.4 mrain Primary = 3,15&@ 1.19 hrs, Volume= 0.417 of Routing by Stor-Ind method, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs Peak Elev= 689.91'@ 1.19 tars Surf Area= 6,472 sf Storage= 16,210 of Plug -Flow detention time= 56.3 iniac calculated for 0.416 of (75% of inflow) Center -of -Mass det. fir ne= 48.1 Haim ( 85.6 - 37..5 ) Volume Invert Avail.Storage Storage Description #1 687.00' 31)174 of Custom Stage Data (Irregular) Listed below (Recale) Elevation Surf.Area Perini. Inc.Store Cumra.Store Wet.Area (feet) (sq -ft) (feet) (cubic -feet) (cubic -feet) (sq -ft) 687:110 4,702. 286.0 0 0 4,702 688.00 5,286 298.0 4,991. 4,991 5,331 689.00 5,895 311.0 5,588 10,579 6,031 690,00 6,530 324.0 6,210 16,789 6,761 691.00 7,189 336.0 6,857 23,646 7,472 692.60 7,874 349.0 7,.529 31,174 8,259 Device Routing Invert Outlet Devices #1 Primary 682.00' 15.0" x 54.0' long Culvert RCI', square edge headwall, Ike= 0.500 Outlet Invert-- 681.00' S= 0.0185'/' Cc= 0.900 n-- 0.01.3 #2 Device 1 688.00' 0,75'W x 0.33'11 Vert. Riser Orifice X 2.00 C=0.600 #3 Device 1 690.00' 48.0" Horiz. Riser Limited to weir flow C= 0.600 #4 Primary 691.00' 8.0' long x 1.50' rise Emergency Spillway 2 End Contractions) 4.0' Crest Height Primary OutFlow Mai --3.15 cfs @ 1.19 firs HW=689,91' (Free Discharge) �-1=Culvert (Passes 3.15 efs of 15.95 efs potential flow) L2=Miser Orifice (Orifice Controls 3.15 cfs @ 6.36 fps) 3=Riser ( Controls 0.00 cfs) -Emergency Spillway ( Controls 0.00 efs) BIRCHWOODrev l,A Albemarle AT'LAS1410 I'var Duration=66 muni, 1ntera 2. 00 in1lar Prepared. by Terra Concepts, PC Page 2 H2:droCAD® 8.00 s/n 002893 © 2006 HydroCAD Software -Solutions LLC 11/5/2006 Pond 1P: Bio -Retention Hydrograph _ ...,M inflow c a M Primary Inflow fierea=3.690 ac Peak Elev=689.91' 5V Stowage= 16,21.0 -..cf. _. 4 0 3 " 1 �� JoC re 'Nell 0 Time (hours) Critical Duration Analysis 18 Elevator, Inflow 0 Primary BIRCHWOODrev VA <41&g marle ATLA814100-Year Duration= -_2 in, ynt�n_3 �4 l�/lir Prepared by Terra Concepts, PC H droCAD® 8;00 s/n 002893 © 2006 HydroCAD Software Solutions LLC Page .1 11/5/2006 Subcatchment 2S: Birchwood/US Joiner Runoff' - 10,86 c:l's @ 0;10 hrs, Volume= 0.672 af, Deptln= 2.1999 Runoff by Rational method, Rise/Fall=1.0/2.+0 xTc, Time Spain= ®,00 3.00 hrs, dt= 0.01 lars VA-Albemaric-ATLAS14100-Year Duration=42 main, Eaten=174 in/hr Area Qac) C Deseriptionn 2 700 0.90 impervious 0.990 0.45 Pervious Landscaped .Area 3.690 0.78 Weighted Average 3.690 0.78 .Pervious Area Ts: Length Slope Velocity Capacity Description (resin) Qfeet) (ft/ft) (ft/sec) 5.9 Direct Entry, Pond IP: Bio -Retention Inflow Area = 30690 ac, Inflow Depth = 2.19" for, 100 -Year event Inflow = 10.86 cfs @ 0.10 tars, Volume= 0.672 of Outflow = 10.09 cfs @ 0.711irs, Volume= 0;544 af, Atten= 7%, Lag 36.9 min Primary = 10.09 efs @ 0.71 hrs, Volume= 0..544 of Routing by Stor-lied method, Time Span= U0-.3.00 cars, dt= 0.01 hrs Peale Elev= 69.0.30'@ 0.71 tars Suarf Area= 6,721 sf Storage= 18,'747 of Plug -Flow detention tinge= 44.1 main calculated for 0.542 of (81% of inflow) Center-of=lY ws det. thane= 40.0 rein ( 65.5 - 25.5 ) Volume Invert Avail.Stora e Stora_ Descri tion #1 687.00' 31,174 cf Custom Stage Data (Irregular) Lasted below (Recale) Elevation Surf:Area Perim. Inc.store Cuma.Store Wet;Area (feet) (s -t) Qfeet) (eubic feet} (cubic feet) Qsca ftl 687.00 4,702 286.0 0 0 4,702 688.00 5,286 298.0 4,991 4,991 5,331 689.00 5,895 311.0 5,588 10,579 6,031 690.00 6,530 324.0 6,210 16,789 6,761 691.00 7,189 336.0 6,857 23,646 7,472 692.00 7,874 349.0 , 7,529 .31,174 8,259 Device Routing Invert Outlet Devices #1 Primary 682.00' 15.0" x 54.0' long Culvert RCP, square edge headwall, Re= 0.500 Outlet Invert= 681.00' S=0-0185'/' Cc= 0,900 n=0-013 #2 Device 1 688.00' 0.75' W x 0.33'H Vert. Riser Orifice X 2.00 C=0,600 #3 Device 1 690.00' 4801 Horiz. Riser Limited to -weir flow C= 0.600 #4 Primary 691.00' 8.0' long x 1.50' rise Emergency Spillway 2 Enol Coaatroction(s) 4.11' Crest Height Primary OutFlow Max -10.07 efs @ 0;71 Tars HW=690,30' (Free Discharge) 1=Culvert (Passes 10.07 cfs of 16.36 efs potential flow) =Riser Orifice (Orifice Controls 3.48 cfs @ 7.03 fps) E31' =Riser (Weir Controls 6.59 cfs @ 1.78 fps) -Emergency Spillway (controls 0.00 efs). p --� 2 Time (hours) Critical Duration Analysis ® Elevation M Inflow ® Primary I -1 Ej7LDxRA CONCEPTS, P.C. CIVIL, ENGINE, ERS LANDSCAPE ARCHITECTS 224 COURT SQUARE 1. CHARLOTTESVILLE, VIRGINIA 22902 PH. 434-295-4005 FAX 434-295-2103 �L I14 op YH OF r, Steven W Edwards ,, . Ltc1No 0931�� r SCN? ISSUED: 11/06/96 6 DRAWN BY. AGF REVISIONS: 0. 11-6-06, INITIAL SUBMITTAL 1, 12-1406, ARE COMMENTS 2. 12-21-06, ACSA, COMMENTS l3. 12-27-06, COUNITY COMMENTS 4. 01-10-07, ACSA COMMENTS 5. 01-31-07, REV FIXTURE LABELS 02-13- SITE PLANS APPROVED. 6. 12-17-437, ElYIERGI'Ky I SPILLWAY CHANGES , All rights reserved. No part of the material protected by this copyright (plans, ideas, designs, sections or details. expressed on these plans) may be. reproduced, changed or utilizedin any form or.by any means, electronic or mechanical, including photocopying, scanning, or by any other means of retrieval system without written permission from Terra Concepts, P.C. Also, these pians may not be assigned to a third party without first written authorization of Terra Concepts, P.C. © TERRA CONCEPTS, P.C.