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HomeMy WebLinkAboutWPO201400095 Calculations 2015-06-02 GLENMORE K2C STORMWATER MANAGEMENT CALCULATIONS PACKET Date of Calculations MARCH 12, 2015 Revised on April 1, May 7 & June 2 of 2015 �f�Lv'S"aS }�1�:i11irt1F� PREPARED BY: COLLINS 200 GARRETT STREET, SUITE K CHARLOTTESVILLE,VA 22902 434.293.3719 PH 434.293.2813 FX www.collins-engineering.com Summary of June 2 Stormwater Management Revisions: Calculations Packet 1. Title sheet was updated with new revision date. 2. Routing calculations were updated for Basins A, C and D. Basins A& D's 1 year routings were separated from the prior report and a 1 year routing of Basins A & D have been provided taking into consideration the bioretention area. 3. Basin C's spillway was raised slightly and expanded to obtain a little more detention. 4. SCS TR-55 Worksheet#4 was revised to show an updated Watershed Summary. 5. A sheet showing channel protection compliance has been added. Stormwater Management Plans: 1. (Sheet 8) Watershed summary was updated. 2. (Sheet 10) Basin A's details were updated to show a barrel invert out of 322'. 3. (Sheet 10) Basin C's profile was updated to show elevations of 340' & 344'. 4. (Sheet 10) Basin C's details for the spillway were updated per calculations packet item #3. DEQ Virginia Runoff Reduction Method Water Quality Calculations Virginia Runoff Reduction Method New Development Worksheet-v2.8 -June 2014 To be used w/2011 BMP Standards and Specifications Site Data Project Name:Glenmore K2C Date:5/7/15 data input cells calculation cells constant values l 1. Post-Development Project& Land Cover Information Constants Annual Rainfall(inches) Target Rainfall Event(inches) 1.00 Phosphorus EMC(mg/L) 0.26 Nitrogen EMC(mg/L) 1.86 Target Phosphorus Target Load(Ib/acre/yr) 0.41 Pj 0.90 Land Cover (acres) A soils B Soils C Soils D Soils Totals Forest/Open Space(acres)--undisturbed, protected forest/open space or reforested land 0.00 0.00 0.00 14.70 Managed Turf(acres)--disturbed,graded for yards or other turf to be mowed/managed 0.00 0.00 0.00 18.68 18.68 Impervious Cover(acres) 0.00 0.00 0.00 3.32 3.32 Total 36.70 Rv Coefficients A soils B Soils C Soils D Soils Forest/Open Space 0.02 0.03 0.04 0.05 Managed Turf 0.15 0.20 0.22 0.25 Impervious Cover 0.95 0.95 0.95 0.95 Land Cover Summary Forest/Open Space Cover(acres) 14.70 Weighted Rv(forest) 0.05- %Forest 40% Managed Turf Cover(acres) 18.68 Weighted Rv(turf) 0.25 %Managed Turf 51% Impervious Cover(acres) 3.32 Rv(impervious) 0.95 %Impervious 9% Total Site Area(acres) 36.70 Site Rv 0.23 Post-Development Treatment Volume(acre-ft) 0.71 Post-Development Treatment Volume(cubic feet) 31,069 Post_Development Load(TP)(Ib/yr) 19.52 Post Development Load(TN)(Ib/yr) f Total Load(TP)Reduction Required(Ib/yr) 4.47 Dr.111.0 NY A , 2 2 • , 5 •2 i 4.---.......4 . 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Q : . , 101.141Q111/0101.1.10oklRECOCal MI par NM= , i . : : : • 0 : lio-d'.101110141100/0.101,0616...7=1%"1.=°V"°,Ww:.:2 i -: • 11.11.11:411110X0 . . Q .----arninamorawadveliuderraimasmarnes‘musti4E11/11FA , it.11400101.17dittelAikr.41ef WY.diik,&10000142VCACGOLAti.s: : imigoommil o ■aasa o� o� °� �a aa,,. inni���.. - aaa® - �� a�at�.+Ia enammun ininiumnummunmu ata■aaa■ �aaaaaa - aiaaaataaa IMI 1 o. °W aaaaa °� °� a a a s aaaaa �aaar - Daae® !■aaa � ru aaaiaaa as 111111111111111111111 ®aa aaaaaa��a��aae o� ataaaa ala MP-� ; saa�a aaaaaaaaa= 111111.1111111.1111111111ME MIRMSPIPIPIRI °� aaaa rommu i �''' su aa■aaiaa�aaaaa� �a IPIIIIPPOI 00 a� aaaaaaaamam°= 000 �� a ataa®at aa■ _ a Mat aaaaatP °0 aa � IMIRMIPPRIPPIENI ° �aaaaa� a�a� �aat�at �• ® ° alias®e_EMI °00 MEM © ■aRPOa 0. MIP1111111.11=11.111 *1111 NM MI ° aaaa - Mg 111114: 1111110,1111r1111 „ 11111 Site Results D.A.A I D.A.B D.A.C D.A.D D.A.E AREA CHECK IMPERVIOUS COVER 0.97 0.00 0.32 1.02 0.00 OK. IMPERVIOUS COVER TREATED 0.97 0.00 0.32 1.02 0.00 OK. TURF AREA 3.39 0.00 3.35 2.34 0.00 OK. TURF AREA TREATED 3.39 0.00 3.35 2.34 0.00 OK. AREA CHECK OK. OK. OK. OK. OK. Phosphorus • ----- TOTAL TREATMENT VOLUME(c1) 31,069 , TOTAL PHOSPHORUS LOAD REDUCTION REQUIRED(LB/YEAR) 4.47 RUNOFF REDUCTION(c1) 4825 ., PHOSPHORUS LOAD REDUCTION ACHIEVED(LB/YR)_ 4.55 , ADJUSTED POST-DEVELOPMENT PHOSPHORUS LOAD(TP)(/b/yr)l 14.971 REMAINING PHOSPHORUS LOAD REDUCTION(LB/YR)NEEDED1CONGNA I cL:i iONSII YOU EXCEEDED THE TARGET REDUCTION BY 0.1 LB/YEAR! Nhropen for Information purposes] . TOTAL TREATMENT VOLUME(d)1_ 31,0891 ,. RUNOFF REDUCTION(ct) 4820 , NITROGEN LOAD REDUCTION ACHIEVED(LB/YR) 72.76 ADJUSTED POST-DEVELOPMENT NITROGEN LOAD(TN)(Ib/yr)l 88.89) Virginia Runoff Reduction Method Worksheet Virginia Runoff Reduction Method New Development Worksheet-v2.8-June 2014 Site Data Summary Total Rainfall= 43 inches Site Land Cover Summary A Soils B Soils C Soils D Soils Total %of Total Forest(acres) 0.00 0.00 0.00 14.70 14.70 40.05 Turf(acres) 0.00 0.00 0.00 18.68 18.68 50.90 Impervious(acres) 0.00 0.00 0.00 3.32 3.32 9.05 36.70 100.00 Site Rv 0.23 Post Development Treatment Volume(ft3) 31069 Post Development TP Load(Ib/yr) 19.52 Post Development TN Load(Ib/yr) 139.65 Total TP Load Reduction Required(Ib/yr) 4.47 Total Runoff Volume Reduction(fe) 4825 Total TP Load Reduction Achieved(lb/yr) 5 Total TN Load Reduction Achieved(Ib/yr) 72.76 Adjusted Post Development TP Load(Ib/yr) 14.97 Remaining Phosphorous Load Reduction(Lb/yr)Required C.00 Drainage Area Summary D.A.A D.A.B D.A.C D.A.D D.A.E Total Forest(acres) 0.00 0.00 0.00 0.00 0.00 0.00 Turf(acres) 3.39 0.00 3.35 2.34 0.00 9.08 Impervious(acres) 0.97 0.00 0.32 1.02 0.00 2.31 11.39 Drainage Area Compliance Summary D.A.A D.A.B D.A.C D.A.D D.A.E Total TP Load Red.(Ib/yr) 2.22 0.00 0.39 1.95 0.00 4.55 TN Load Red.(Ib/yr) 28.83 0.00 18.60 25.33 0.00 72.76 Summary Print Virginia Runoff Reduction Method Worksheet Drainage Area A Summary Land Cover Summary A Soils B Soils C Soils D Soils Total %of Total Forest(acres) 0.00 0.00 0.00 0.00 0.00 0.00 Turf(acres) 0.00 0.00 0.00 3.39 3.39 77.75 Impervious(acres) 0.00 0.00 0.00 0.97 0.97 22.25 4.36 BMP Selections Practice Credit Area(acres) Downstream Practice 6.a.Bioretention#1 or Urban Bioretention(Spec#9) Impervious: 0.97 Turf(Pervious): 3.39 Total Impervious Cover Treated(acres) 0.97 Total Turf Area Treated(acres) 3.39 Total TP Load Reduction Achieved in D.A.A(Ib/yr) 2.22 Total TN Load Reduction Achieved in D.A.A(Ib/yr) 28.83 Summary Print Virginia Runoff Reduction Method Worksheet Drainage Area C Summary Land Cover Summary A Soils B Soils C Soils D Soils Total %of Total Forest(acres) 0.00 0.00 0.00 0.00 0.00 0.00 Turf(acres) 0.00 0.00 0.00 3.35 3.35 91.28 Impervious(acres) 0.00 0.00 0.00 0.32 0.32 8.72 3.67 BMP Selections Practice Credit Area(acres) Downstream Practice 8.a.ED#1(Spec#15) Impervious: 0.32 Turf(Pervious): 3.35 Total Impervious Cover Treated(acres) 0.32 Total Turf Area Treated(acres) 3.35 Total TP Load Reduction Achieved in D.A.A(Ib/yr) 0.39 Total TN Load Reduction Achieved in D.A.A(ib/yr) 18.60 Summary Print Virginia Runoff Reduction Method Worksheet Drainage Area D Summary Land Cover Summary A Soils B Soils C Soils D Soils Total %of Total Forest(acres) 0.00 0.00 0.00 0.00 0.00 0.00 Turf(acres) 0.00 0.00 0.00 2.34 2.34 69.64 Impervious(acres) 0.00 0.00 0.00 1.02 1.02 30.36 3.36 BMP Selections Practice Credit Area(acres) Downstream Practice 6.a.Bioretention#1 or Urban Bioretention(Spec#9) Impervious: 1.02 Turf(Pervious): 2.34 Total Impervious Cover Treated(acres) 1.02 Total Turf Area Treated(acres) 2.34 Total TP Load Reduction Achieved in D.A.A(Ib/yr) 1.95 Total TN Load Reduction Achieved in D.A.A(Ib/yr) 25.33 Summary Print SCS TR-55 Calculations Soils Mapping (Source: NRCS Web Soil Survey Online Database) 0. . .- r • C 516 51 1 . tti i ` 51D 626, , l r._. ; a ' / , a r Iv' c I ) t 5•6 *\‘',. '\. ( ,,,,"'-----' d Soils Table (Source: NRCS Web Soil Survey Online Database) Abemerls County,Virginia(YAM) Map Unk Symbol I Map Unit None Percent of AOI 16 Chewacle sit loam 4,6% 51 B Manan charnecy silt loam.2 to 15.8% 7 percent slopes 5i C Menten chernsry silt loam.7 to 15.1% 15 percent slopes 510 Menton channory s*loam.15 57.2% to 25 percent slopes 628 Neson srh loam.2 to 7 percent 7,3% slopes Totals for Area of Interest 100,0% 1 Note: Soils' properties witin proposed disturbances are predominantly composed of hydrologic type D soils. U.S.Department of Agriculture FL-ENG-21A Natural Resources Conservation Service 06/04 TR 55 Worksheet 2:Runoff Curve Number and Runoff Project: Glenmore K2C Development Designed By: FGM,PE Date: 5/7/2015 Location: Carroll Creek Road Checked By: FGM,PE Date: 5/7/2015 Check One: Present X De X 1.Runoff curve Number(CN) a Soil name and Cover description Drainage CN(weighted)_ Area hydrologic rou (Cover type,treatment,and hydrologic condition; Area Product of Calculated group CN total product/ tion (Appendix A) percent impervious;unconnected/connected (Acres) CN x Area 'S'Value Descri P ( pP total area impervious area ratio) A+B Impervious Areas 98 0.00 0.0 (Present) D Woods in Good Condition 77 6.13 472.0 77.0 2.99 Lawns in Good Condition(75%+Groundcover) 80 0.00 0.0 A Impervious Areas 98 0.97 94.9 (Developed) D Woods in Good Condition 77 0.00 0.0 83.5 1.97 Lawns in Good Condition(75%+Groundcover) 80 3.95 316.1 B Impervious Areas 98 0.08 7.9 (Developed) D Woods in Good Condition 77 1.03 79.3 79.0 2.65 Lawns in Good Condition(75%+Groundcover) 80 0.59 47.2 C,D+E Impervious Areas 98 0.07 6.9 (Present) D Woods in Good Condition 77 14.31 1101.9 77.1 2.97 Lawns in Good Condition(75%+Groundcover) 80 0.00 0.0 C Impervious Areas(Proposed+Future Half of 2 Home Sites 98 0.32 31.5 (Developed) D Woods in Good Condition 77 0.00 0.0 81.6 2.26 Lawns in Good Condition(75%+Groundcover) 80 3.35 267.9 D Impervious Areas 98 1.02 100.2 (Developed) D Woods in Good Condition 77 0.00 0.0 85.5 1.70 Lawns in Good Condition(75%+Groundcover) 80 2.34 187.0 E Impervious Areas 98 0.35 34.1 (Developed) D Woods in Good Condition 77 3.79 291.8 79.4 2.60 Lawns in Good Condition(75%+Groundcover) 80 _ 4.11 329.0 F Impervious Areas 98 0.16 15.7 D Woods in Good Condition 77 10.37 798.5 77.5 2.91 (Present) Lawns in Good Condition(75%+Groundcover) 80 0.58 46.4 F Impervious Areas 98 0.44 43.4 (Developed) D Woods in Good Condition 77 6.34 488.0 78.9 2.68 Lawns in Good Condition(75%+Groundcover) 80 2.94 235.2 2.Runoff 1-Year Storm 2-Year Storm 10-Year Storm Drainage Area Description Frequency-years 1 2 10 n/a Rainfall,P(24 hour)-inches 3.5 3.7 5.6 n/a Runoff,Q-inches 1.43 1.58 3.13 A+B(Present) Runoff,Q-inches 1.90 2.07 3.78 A(Developed) Runoff,Q-inches 1.57 1.73 3.33 B(Developed) Runoff,Q-inches 1.44 1.59 3.14 C,D+E(Present) Runoff,Q-inches 1.75 1.92 3.58 C(Developed) Runoff,Q-inches 2.06 2.23 3.98 D(Developed) Runoff,Q-inches 1.59 1.75 3.36 E(Developed) Runoff,Q-inches 1.46 1.61 3.18 F(Present) Runoff,Q-inches 1.56 1.71 3.31 F(Developed) U.S.Department of Agriculture FL-ENG-21A Natural Resources Conservation Service 06/04 TR 55 Worksheet 3:Time of Concentration(T ,)or Travel Time(T r) Project: Glenmore K2C Development Designed By: FGM,PE Date: 5/7/2015 Location: Carroll Creek Road Checked By: FGM,PE Date: 5/7/2015 Check One: Present X Developed X Check One: T, X T, Through subarea n/a A+B A B C,D+E C D E F F Segment ID: (Present) (Developed) (Developed) (Present) (Developed) (Developed) (Developed) (Present) (Developed) Sheet Flow:(Applicable to T ,only) Woods-Light Dense Woods-Light Woods-Light Woods-Light Dense Woods-Light Woods-Light Woods-Light 1 Surface description(Table 3-1) Underbrush Grass Underbrush Underbrush Underbrush Grass Underbrush Underbrush Underbrush 2 Manning's roughness coeff.,n(Table 3-1 0.4 0.24 0.4 0.4 0.4 0.24 0.4 0.4 0.4 3 Flow length,L(total L <100)(ft) 100 75 100 100 100 100 100 100 100 4 Two-year 24-hour rainfall,P z(in.) 3.7 3.7 3.7 3.7 3.7 3.7 3.7 3.7 3.7 5 Land slope,s(ft/ft) 0.07 0.05 0.15 0.06 0.07 0.06 0.06 0.06 0.06 6 Compute T,=[0.007(n•L)oel/P5OS 505 I 0.20 I 0.12 I 0.15 I 0.21 I 0.20 I 0.143 I 0.21 I 0.21 I 0.21 Shallow Concentrated Flow: 7 Surface description(paved or unpaved) Unpaved Unpaved Unpaved Unpaved Unpaved Unpaved Unpaved Unpaved Unpaved 8 Flow Length,L(ft) 860 960 225 705 170 660 705 825 825 9 Watercourse slope,s(ft/ft) 0.13 0.03 0.22 0.11 0.21 0.11 0.11 014 0.14 10 Average velocity,V(Figure 3-1)(ft/s) 5.7 2.8 7.5 5.4 7.4 5.4 5.4 6.0 6.0 11 T,=L/3600•V I 0.04 I 0.10 I 0.01 I 0.04 I 0.01 I 0.034 I 0.04 I 0.04 I 0.04 I Channel Flow: 12 Cross sectional flow area,a(ft l) 13 Wetted perimeter,P w,(ft) w 14 Hydraulic radius,r=a/P w(ft) E.Q. 15 Channel Slope,s(ft/ft) ° n,4, 16 Manning's Roughness Coeff,n IS 17 V=[1.49rUOsosl/n o 8 18 Flow length,L(ft) o 19 T5=L/3600•V I I 0.00 I I I I I I I I 20 Watershed or subarea T,or T, (Add T,in steps 6,11 and 19) ( 0.24 I 0.22 I 0.16 I 0.25 I 0.21 I 0.18 I 0.25 I 0.25 I 0.25 1 CI) to , , \ 22 i #;� : / °°22 \) �\!w, - - - - 4 F. tt (/ -}) ® -\\\ }\ - \ / ! ! ---r' ' '' ° - - 2 � 2 604. . r - . o - q!, - ¥ / k) / t;-: ° ` ` !! , � . _ ; ; _ : 2 . 8' ° . - 2 ;,01W - 1 £ -'' : ola .; = � ; !@ �§ . !f \k i °° ~ ( ` -q2 - ) !!!!e!! F. ; .. . ; ;1"-g, f / „ \8 _§ _ , ! /! ƒ- ` ` - !! !! f -;29E5 ) � { (! !!§ \ n! - : E » `` !`®! - \ \ \ ,\\ /E : §E§ ® gales \ -q P! - ;- 3 m !° , � � � , \ # - U! § - ° - ! | ! i° ° -; § ;B - ! �!:!!5 §/ 20 ®! - 2 _ i \� _ � 0 . ao: = = - in. /A . 0 ° � § , , ° -=§2E! - ) ! ! ! \{ 7/)r | - ° \\\\ }\� \ \� � \ \ L” k] i . TA it [ '*\ \ _)(%�{ \\ \! { ! \! k Imp E21.. | g! ` � _ W f f !:.PiP /I - } , . :! ! z!>« ! ! £ a . � 0 � � . z n / . /2�))/ \/ §!;■ : !I IT; 111131 Post-Development Routing Calculations Basin A- 1 YEAR- Bioretention Cell BasinFlow printout INPUT: Basin: Basin A- 1 YEAR Bioretention Cell Routing 3 Contour Areas Elevation(ft) Area(sf) Computed vol . (cy) 336.00 2384.00 0.0 337.00 2901.00 97.7 338.00 3460.00 215.4 Start_Elevation(ft) 336.00 vol . (cy) 0.00 1 outlet Structures Outlet structure 0 weir name: Emergency Spillway length (ft) 30.000 side angle 75. 500 coefficient 3.300 invert (ft) 337.000 multiple 1 discharge through dam 1 Inflow Hydrographs Hydrograph 0 SCS name: 1 yr 24hr SCS Method Storm Event Area (acres) 4.920 CN 83.500 pe rainfall , PT(in) 2 3.500 time of conc. (hrs) 0.2200 time increment (hrs) 0.0050 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 9.848 peak time (hrs) 11.967 volume (cy) 1253.806 OUTPUT: Routing Method: storage-indication Hydrograph 0 Routing Summary of Peaks: 1 yr 24hr SCS Method Storm Event inflow (cfs) 9.847 at 11.97 (hrs) discharge (cfs) 9.761 at 12.00 (hrs) water level (ft) 337.210 at 12.00 (hrs) storage (cy) 120.760 Mon Jun 01 12:09:28 EDT 2015 Page 1 Bioretention Cell A Outfall Hydrograph Time(min.) Discharge(cfs) 0.0 0 0.5 0.000 1.0 0.000 1.5 0.000 2.0 0.000 2.5 0.000 3.0 0.000 3.5 0.000 4.0 0.000 4.5 0.000 5.0 0.000 5.5 0.000 6.0 0.000 6.5 0.027 7.0 0.032 7.5 0.038 8.0 0.042 8.5 0.062 9.0 0.092 Discharge (cfs) 9.5 0.105 12 - - 10.0 0.141 10.5 0.217 10 a - --- 11.0 0.358 11.5 0.713 8 - -- - - - 12.0 9.756 6 - - -12.5 1.016 ■Discharge(cfs) 13.0 0.403 4 - 13.5 0.254 14.0 0.165 2 14.5 0.122 ` 15.0 0 100 0 +r-m--rr-rr-rrr-r-rrrrffi'- i'? .=rn gym 1 rrn r r� 1 4 7 10 13 16 19 22 25 28 31 34 37 40 43 46 49 15.5 0.076 - - - 16.0 0.057 16.5 0.046 17.0 0.039 17.5 0.031 18.0 0.026 18.5 0.020 19.0 0.015 19.5 0.010 20.0 0.006 20.5 0.004 21.0 0.003 21.5 0.002 22.0 0.002 22.5 0.001 23.0 0.001 23.5 0.000 24.0 0.000 Basin A- 1 YEAR- Detention Cell BasinFlow printout INPUT: Basin: Basin A- 1 YEAR Detention Cell Routing 11 Contour Areas Elevation(ft) Area(sf) Computed Vol . (cy) 326.00 68.00 0.0 327.00 248.00 5.5 328.00 485.00 18.8 329.00 768.00 41.8 330.00 1092.00 76.1 331.00 1455.00 123.1 332.00 1853.00 184.2 333.00 2284.00 260.7 334.00 2747.00 353.7 335.00 3235.00 464.4 336.00 3750.00 593.6 Start_Elevation(ft) 326.00 vol . (cy) 0.00 4 Outlet Structures Outlet structure 0 Orifice name: Riser area (sf) 3.142 diameter or depth (in) 24.000 width for rect. (in) 0.000 coefficient 0. 500 invert (ft) 333.750 multiple 1 discharge into riser Outlet structure 1 weir name: Emergency Spillway length (ft) 60.000 side angle 75. 500 coefficient 3.300 invert (ft) 334.750 multiple 1 discharge through dam Outlet structure 2 Orifice name: Low-Flow Orifice area (sf) 0.545 diameter or depth (in) 10.000 width for rect. (in) 0.000 coefficient 0. 500 invert (ft) 326.000 multiple 1 discharge into riser Page 1 Basin A- 1 YEAR- Detention Cell Outlet structure 3 Culvert name: Barrel multiple 1 discharge out of riser D (in) 15.000 h (in) 0.000 Length (ft) 84.000 Slope 0.024 Manning's n 0.013 Inlet coeff. Ke 0.500 Equation constant set 3 Invert (ft) 324.000 1 Inflow Hydrographs Hydrograph 0 Curve name: 1 Year Final Routing time incr (minIhrs) 0. 50 time limit (minIhrs) 24.00 file: 1 YEAR Hydrograph- Bio Cell Outfall .txt volume (cy) 15.54 routed true time in hours false OUTPUT: Routing Method: storage-indication Hydrograph 0 Routing Summary of Peaks: 1 Year Final Routing inflow (cfs) 9.756 at 12.00 (min) discharge (cfs) 2.242 at 12. 50 (min) water level (ft) 327.467 at 12.50 (min) storage (cy) 10.641 Tue Jun 02 09:57:30 EDT 2015 Page 2 `7 i-ck Basin A- Detention Cell BasinFlow printout INPUT: Basin: Basin A- Detention Cell Routing 11 Contour Areas Elevation(ft) Area(sf) Computed vol . (cy) 326.00 68.00 0.0 327.00 248.00 5.5 328.00 485.00 18.8 329.00 768.00 41.8 330.00 1092.00 76.1 331.00 1455.00 123.1 332.00 1853.00 184.2 333.00 2284.00 260.7 334.00 2747.00 353.7 335.00 3235.00 464.4 336.00 3750.00 593.6 start_Elevation(ft) 326.00 vol . (cy) 0.00 4 Outlet Structures Outlet structure 0 Orifice name: Riser area (sf) 3.142 diameter or depth (in) 24.000 width for rect. (in) 0.000 coefficient 0. 500 invert (ft) 333.750 multiple 1 discharge into riser Outlet structure 1 weir name: Emergency Spillway length (ft) 60.000 side angle 75.500 coefficient 3.300 invert (ft) 334.750 multiple 1 discharge through dam Outlet structure 2 Orifice name: Low-Flow Orifice area (sf) 0. 545 diameter or depth (in) 10.000 width for rect. (in) 0.000 coefficient 0. 500 invert (ft) 326.000 multiple 1 discharge into riser Page 1 Basin A- Detention Cell Outlet structure 3 Culvert name: Barrel multiple 1 discharge out of riser D (in) 15.000 h (in) 0.000 Length (ft) 84.000 Slope 0.024 Manning's n 0.013 Inlet coeff. Ke 0.500 Equation constant set 3 Invert (ft) 324.000 3 Inflow Hydrographs Hydrograph 0 SCS name: 2 yr 24hr SCS Method Storm Event Area (acres) 4.920 CN 83. 500 pe rainfall , PT(in) 2 3.700 time of conc. (hrs) 0.2200 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 10.735 peak time (hrs) 11.967 volume (cy) 1366.733 Hydrograph 1 SCS name: 10 yr 24hr SCS Method Storm Event Area (acres) 4.920 CN 83. 500 pe rainfall , PT(in) 2 5.600 time of conc. (hrs) 0.2200 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 19.582 peak time (hrs) 11.967 volume (cy) 2493.067 Hydrograph 2 SCS name: 100 yr 24hr SCS Method Storm Event Area (acres) 4.920 CN 83.500 Type 2 rainfall , P (in) 9.100 time of conc. (hrs) 0.2200 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 36.824 peak time (hrs) 11.967 volume (cy) 4688.261 Page 2 Basin A- Detention Cell OUTPUT: Routing Method: storage-indication Hydrograph 0 Routing Summary of Peaks: 2 yr 24hr SCS Method Storm Event inflow (cfs) 10.728 at 11.98 (hrs) discharge (cfs) 5.372 at 12.14 (hrs) water level (ft) 332.448 at 12.14 (hrs) storage (cy) 216. 523 Hydrograph 1 Routing Summary of Peaks: 10 yr 24hr SCS Method Storm Event inflow (cfs) 19.569 at 11.98 (hrs) discharge (cfs) 12. 517 at 12.10 (hrs) water level (ft) 334.758 at 12.10 (hrs) storage (cy) 435.893 Hydrograph 2 Routing Summary of Peaks: 100 yr 24hr SCS Method Storm Event inflow (cfs) 36.801 at 11.98 (hrs) discharge (cfs) 35.504 at 11.98 (hrs) water level (ft) 334.974 at 11.98 (hrs) storage (cy) 461.241 Mon Jun 01 10:50:24 EDT 2015 Page 3 ('ark sZNS_ knlFa R.Q .cr( \IoueNC, ORX 4C.E. 1�Es6 J ' .o+zoEs Two Pt TEtoco5 rcri �.., - text CES, cA�.G AL4 ONS 3EW'' usE M ��� QoAL`Ty QRS�`Ic.E 1)E SZGi„ SING ,�IAXxMwM i'1y wt.,x.C. 1-k A.0 AN-0TVN+� OF 4 V.rnr tisA 5-0204.wA-rc4 BINS' c sNG - o,ASaE, SQS.cz.QzcAtzrn► \S SECTaroe 6.3 S-r, s, "MGTWAS Iia. 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E.D.. ss a 7,+ u >3Asgo ,orc 1 'd03 VSMtj,c Kir t/+ sc-c."rzr+.. I I.Lt.3+stirs Tv ,i.. as CALcucp"CF.D 159 MW1-1-PLYw6 ,E 1" Rpt.NPALL t PI*4 V T14 C°"^posxtE, (Z MAX GlS�! CO S(ik*Alt‘ 1. t3cnTcv�t a 13t1� cL �Tv .n� n►rn-�-; blaxa►CHa4.s+r SPC-c-;415 sEcT.zcw 6.6ti1-17-t>eD LTRratriv..Arr 3`IGr t5 '340 VcLKMC.(wATEROWU-I1 i) 51.00,!144' srCTE5 '-THE '7ZSrAL T„ srb2M' MA't 036- y'tYa‘1.0tAll Ti A cOM1 NglZJ PERNtA rA- 6:15` ,. A EkTL:NOM Q�CicrN't SONa..�� SPcc. 1S LAT,EAR.SZATES J v M(�'� 'V eR13..cAt eserEActo GTEwrIc �.S/�\ \\Tial /'Vt K ri4 =J (i El) WATER S uJLFocE ELeuAtret4 MA-1 mit �1_xReiMO /*we ThAN 5�ABaJ ?f E c-N T Loos.a& NoRmAL ('m►. Fi-z..44-"taD+u Fak a LZ:‘)E1- 1 9Fs ".+, o0, y RA A cevE.L, a ocsac.4 NoA tAAL ?ca_> vht-Icw 4 5' = 344'rt 5' rRx_ 9 - �x�v _ 39 (rtnxtAtiet Cosy. Fe.1xT (a ) ? ) NnIE, 34 5 "ca.t. .1 :1;) AtAisEueo 1)16 FoR to .Is �,v+x, ` 4144 fi� f ikT,, NourvaL'ice 6.ttcv. 5, �dy x 60k6o)5Ec QMAx = 0.O42 /s Nom; rkuh Rco► Euro C Cvac_E Os TER =�.1 r Q = QMA`C 0,09 S 0.009 a qNO A= R' op, 0.Q)` = R c ca ag 1,a (o.$),�a(sa,ft)(6.Is) 0.036' oa ¢oNr Basin C BasinFlow printout ,){'mecca_,,.,a ,� .) C=:sm ) 5 I�d ttcY3• \-t>-‘ 0 ,7c..TC,�rs ✓ a te 19 h, INPUT: Basin: Extended Detention Basin C 8 Contour Areas Elevation(ft) Area(sf) Computed vol . (cy) 344.00 249.00 0.0 344.33 1367.00 9.0 345.00 1831.00 48.5 346.00 2305.00 124.9 347.00 3088.00 224.4 348.00 4049.00 356.2 349.00 5052.00 524.4 350.00 6292.00 734.1 Start_Elevation(ft) 344.00 Vol . (cy) 0.00 5 Outlet Structures Outlet structure 0 Orifice name: Riser area (sf) 3.142 diameter or depth (in) 24.000 width for rect. (in) 0.000 coefficient 0.500 invert (ft) 347.000 multiple 1 discharge into riser Outlet structure 1 Weir name: Emergency Spillway length (ft) 70.000 side angle 75.520 coefficient 3.300 invert (ft) 348.800 multiple 1 discharge through dam Outlet structure 2 Orifice name: Low-Flow Orifice area (sf) 0.049 diameter or depth (in) 3.000 width for rect. (in) 0.000 coefficient 0.500 invert (ft) 344.000 multiple 1 discharge into riser Outlet structure 3 Orifice name: Mid-Flow Orifice area (sf) 0.196 diameter or depth (in) 6.000 width for rect. (in) 0.000 coefficient 0.500 invert (ft) 346.150 multiple 2 discharge into riser Page 1 Basin C Outlet structure 4 Culvert name: Barrel multiple 1 discharge out of riser D (in) 10.000 h (in) 0.000 Length (ft) 112.000 Slope 0.031 Manning's n 0.013 Inlet coeff. Ke 0. 500 Equation constant set 3 Invert (ft) 340.000 4 Inflow Hydrographs Hydrograph 0 SCS name: 1 yr 24hr SCS Method Storm Event Area (acres) 3.670 CN 81.600 pe rainfall , PT(in) 2 3. 500 time of conc. (hrs) 0.2100 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 6.896 peak time (hrs) 11.982 volume (cy) 864.009 Hydrograph 1 SCS name: 2 yr 24hr SCS Method Storm Event Area (acres) 3.670 CN 81.600 pe rainfall , PT(in) 2 3.700 time of conc. (hrs) 0.2100 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 7.546 peak time (hrs) 11.982 volume (cy) 945.425 Hydrograph 2 SCS name: 10 yr 24hr SCS Method Storm Event Area (acres) 3.670 CN 81.600 Type 2 rainfall , P (in) 5.600 time of conc. (hrs) 0.2100 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 14.088 peak time (hrs) 11.982 volume (cy) 1765.176 Page 2 Basin C Hydrograph 3 SCS name: 100 yr 24hr SCS Method Storm Event Area (acres) 3.670 CN 81.600 Type 2 rainfall , P (in) 9.100 time of conc. (hrs) 0.2100 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 26.990 peak time (hrs) 11.982 volume (cy) 3381.846 OUTPUT: Routing Method: storage-indication Hydrograph 0 Routing Summary of Peaks: 1 yr 24hr SCS Method Storm Event inflow (cfs) 6.891 at 11.98 (hrs) discharge (cfs) 4.029 at 12.12 (hrs) water level (ft) 347.523 at 12.12 (hrs) storage (cy) 288.950 Hydrograph 1 Routing Summary of Peaks: 2 yr 24hr SCS Method Storm Event inflow (cfs) 7.540 at 11.98 (hrs) discharge (cfs) 4.918 at 12.10 (hrs) water level (ft) 347.632 at 12.10 (hrs) storage (cy) 303. 523 Hydrograph 2 Routing Summary of Peaks: 10 yr 24hr SCS Method Storm Event inflow (cfs) 14.078 at 11.98 (hrs) discharge (cfs) 7.343 at 12.10 (hrs) water level (ft) 348.831 at 12.10 (hrs) storage (cy) 493.330 Hydrograph 3 Routing Summary of Peaks: 100 yr 24hr SCS Method Storm Event inflow (cfs) 26.971 at 11.98 (hrs) discharge (cfs) 26.245 at 11.98 (hrs) water level (ft) 348.995 at 11.98 (hrs) storage (cy) 523. 512 Mon Jun 01 15:48:38 EDT 2015 Page 3 Basin D- 1 YEAR Bioretention Cell BasinFlow printout INPUT: Basin: Basin D- 1 YEAR Bioretention Cell Routing 3 Contour Areas Elevation(ft) Area(sf) Computed vol . (cy) 326.00 2429.00 0.0 327.00 2995.00 100.3 328.00 3604.00 222.3 Start_Elevation(ft) 326.00 Vol . (cy) 0.00 1 Outlet Structures Outlet structure 0 Weir name: Emergency Spillway length (ft) 30.000 side angle 75.520 coefficient 3.300 invert (ft) 327.000 multiple 1 discharge through dam 1 Inflow Hydrographs Hydrograph 0 SCS name: 1 yr 24hr SCS Method Storm Event Area (acres) 3.360 CN 85.500 pe rainfall , PT(in) 2 3.500 time of conc. (hrs) 0.1800 time increment (hrs) 0.0050 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 7.711 peak time (hrs) 11.970 volume (cy) 928.386 OUTPUT: Routing Method: storage-indication Hydrograph 0 Routing Summary of Peaks: 1 yr 24hr SCS Method Storm Event inflow (cfs) 7.711 at 11.95 (hrs) discharge (cfs) 7.617 at 11.98 (hrs) water level (ft) 327.179 at 11.97 (hrs) storage (cy) 120.431 Mon Jun 01 12:50:58 EDT 2015 Page 1 Bioretention Cell D Outfall Hydrograph Time(min.) Discharge(cfs) 0.0 0.000 0.5 0.000 1.0 0.000 1.5 0.000 2.0 0.000 2.5 0.000 3.0 0.000 3.5 0.000 4.0 0.000 4.5 0.000 5.0 0.000 5.5 0.000 6.0 0.000 6.5 0.000 7.0 0.000 7.5 0.000 8.0 0.049 __.. - - --i 8.5 0.064 Discharge (cfs) 9.0 0.085 9.5 0.093 ! 8.000 - 10.0 0.119 7.000 10.5 0.172 6.000 11.0 0.268 11.5 0.514 5.000 + -12.0 7.620 4.000 12.5 0.621 •Discharge(cfs) 3.000 E 13.0 0.284 2.000 13.5 0.189 14.0 0.131 1.000 14.5 0.104 0.000 15.0 0.089 1 4 7 10 13 16 19 22 25 28 31 34 37 40 43 46 49 15.5 0.072 16.0 0.059 16.5 0.051 17.0 0.047 17.5 0.041 18.0 0.037 18.5 0.033 19.0 0.028 19.5 0.024 20.0 0.020 20.5 0.018 21.0 0.017 21.5 0.016 22.0 0.016 22.5 0.015 23.0 0.014 23.5 0.013 24.0 0.013 24.5 0.000 Basin D- 1 YEAR Detention Cell BasinFlow printout INPUT: Basin: Basin D- 1 YEAR Detention Cell Routing 7 Contour Areas Elevation(ft) Area(sf) Computed Vol . (cy) 320.00 707.00 0.0 321.00 1129.00 33.7 322.00 1660.00 85.0 323.00 2267.00 157.5 324.00 2901.00 252.9 325.00 3560.00 372.4 326.00 4244.00 516.7 Start_Elevation(ft) 320.00 vol . (cy) 0.00 4 Outlet Structures Outlet structure 0 weir name: Emergency Spillway length (ft) 40.000 side angle 75.520 coefficient 3.300 invert (ft) 324.750 multiple 1 discharge through dam Outlet structure 1 Orifice name: Riser area (sf) 3.142 diameter or depth (in) 24.000 width for rect. (in) 0.000 coefficient 0. 500 invert (ft) 323.750 multiple 1 discharge into riser Outlet structure 2 Orifice name: Low-Flow Orifice area (sf) 0.349 diameter or depth (in) 8.000 width for rect. (in) 0.000 coefficient 0.500 invert (ft) 320.000 multiple 1 discharge into riser Outlet structure 3 Culvert name: Barrel multiple 1 discharge out of riser D (in) 15.000 h (in) 0.000 Length (ft) 72.000 Slope 0.010 Manning's n 0.013 Inlet coeff. Ke 0.500 Equation constant set 3 Invert (ft) 316.720 Page 1 Basin D- 1 YEAR Detention Cell 1 Inflow Hydrographs Hydrograph 0 Curve name: 1 YEAR Final Routing time incr (minIhrs) 0. 50 time limit (minIhrs) 24.00 file: 1 YEAR Hydrograph- Bio Cell Outfall .txt volume (cy) 12.14 routed true time in hours false OUTPUT: Routing Method: storage-indication Hydrograph 0 Routing Summary of Peaks: 1 YEAR Final Routing inflow (cfs) 7.620 at 12.00 (min) discharge (cfs) 0.407 at 13.00 (min) water level (ft) 320.346 at 13.00 (min) storage (cy) 9.913 Tue Jun 02 10:04:13 EDT 2015 Page 2 Basin D- Detention Cell I. `�� yz,,y�; ��_ '� L`t:.�w,<� BasinFlow printout INPUT: Basin: Basin D Detention Cell Routing 7 Contour Areas Elevation(ft) Area(sf) Computed vol . (cy) 320.00 707.00 0.0 321.00 1129.00 33.7 322.00 1660.00 85.0 323.00 2267.00 157.5 324.00 2901.00 252.9 325.00 3560.00 372.4 326.00 4244.00 516.7 Start_Elevation(ft) 320.00 vol . (cy) 0.00 4 Outlet Structures Outlet structure 0 Weir name: Emergency Spillway length (ft) 40.000 side angle 75.520 coefficient 3.300 invert (ft) 324.750 multiple 1 discharge through dam Outlet structure 1 Orifice name: Riser area (sf) 3.142 diameter or depth (in) 24.000 width for rect. (in) 0.000 coefficient 0. 500 invert (ft) 323.750 multiple 1 discharge into riser Outlet structure 2 Orifice name: Low-Flow Orifice area (sf) 0.349 diameter or depth (in) 8.000 width for rect. (in) 0.000 coefficient 0.500 invert (ft) 320.000 multiple 1 discharge into riser Outlet structure 3 Culvert name: Barrel multiple 1 discharge out of riser D (in) 15.000 h (in) 0.000 Length (ft) 72.000 Slope 0.010 Manning's n 0.013 Inlet coeff. Ke 0.500 Equation constant set 3 Invert (ft) 316.720 Page 1 Basin D- Detention Cell 3 Inflow Hydrographs Hydrograph 0 SCS name: 2 yr 24hr SCS Method Storm Event Area (acres) 3.360 CN 85. 500 Type 2 rainfall , P (in) 3.700 time of conc. (hrs) 0.1800 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 8.373 peak time (hrs) 11.970 volume (cy) 1008.077 Hydrograph 1 SCS name: 10 yr 24hr SCS Method Storm Event Area (acres) 3.360 CN 85. 500 Type 2 rainfall , P (in) 5.600 time of conc. (hrs) 0.1800 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 14.912 peak time (hrs) 11.970 volume (cy) 1795.456 Hydrograph 2 SCS name: 100 yr 24hr SCS Method Storm Event Area (acres) 3.360 CN 85.500 Type 2 rainfall , P (in) 9.100 time of conc. (hrs) 0.1800 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 27.513 peak time (hrs) 11.970 volume (cy) 3312.593 Page 2 Basin D- Detention Cell OUTPUT: Routing Method: storage-indication Hydrograph 0 Routing summary of Peaks: 2 yr 24hr SCS Method Storm Event inflow (cfs) 8.373 at 11.96 (hrs) discharge (cfs) 3.140 at 12.14 (hrs) water level (ft) 323.991 at 12.14 (hrs) storage (cy) 251.950 Hydrograph 1 Routing Summary of Peaks: 10 yr 24hr SCS Method Storm Event inflow (cfs) 14.912 at 11.96 (hrs) discharge (cfs) 11.962 at 12.02 (hrs) water level (ft) 324.819 at 12.02 (hrs) storage (cy) 348.865 Hydrograph 2 Routing Summary of Peaks: 100 yr 24hr SCS Method Storm Event inflow (cfs) 27.513 at 11.96 (hrs) discharge (cfs) 27.001 at 11.96 (hrs) water level (ft) 324.991 at 11.96 (hrs) storage (cy) 371.203 Mon Jun 01 11:44:14 EDT 2015 Page 3 \j(4 5 iJ-66 (HANwL 0-::* CC)1,,V,P-A f (C 764' , e • • , r .71 ' — ' L• 'I-A t ;Lai t. j(- ••• — ' 6 '71 r- • L. ILA A tn. • - ' („; 7, •, C'• \t` . „,. • t 7 .-; ' ...L. • ' • • - .4 rs —• , - ) ) • ; ' - (4 S 7 ' — 1- •; - -4 t ejf elv„ Lit •