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HomeMy WebLinkAboutWPO202100019 Calculations 2021-04-08 (2)GREENBRIER OFFICE BUILDING HYDROLOGIC AND HYDRAULIC COMPUTATIONS FIRST SUBMISSION 04-08-2021 TAX MAP 61 W-03-6 ALBEMARLE COUNTY, VA OWNER: CHARLOTTESVILLE LAND TRUST FKIrINFFR- MICHAEL MYERS, P.E., C.F.M. 30 SCALE, LLC G��c o M L F. S y Lic. No. 33028 04/08/2021 w 10NAL m SCALE ENGINEERING Hydraflow Table of Contents FINAL SWIM ROUTING.gpw Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2020 Tuesday, 02/2/2021 Watershed Model Schematic...................................................................................... 1 1 -Year HydrographReports................................................................................................................... 2 Hydrograph No. 1, SCS Runoff, PRE....................................................................................... 2 Hydrograph No. 2, SCS Runoff, POST.................................................................................... 3 Hydrograph No. 4, Reservoir, ROUTING................................................................................. 4 PondReport - PIPES........................................................................................................... 5 Hydrograph No. 6, Rational, OFFSITE TO CULVERT............................................................ 6 2 - Year HydrographReports................................................................................................................... 7 Hydrograph No. 1, SCS Runoff, PRE....................................................................................... 7 Hydrograph No. 2, SCS Runoff, POST.................................................................................... 8 Hydrograph No. 4, Reservoir, ROUTING................................................................................. 9 Hydrograph No. 6, Rational, OFFSITE TO CULVERT.......................................................... 10 10 - Year HydrographReports................................................................................................................. 11 Hydrograph No. 1, SCS Runoff, PRE..................................................................................... 11 Hydrograph No. 2, SCS Runoff, POST.................................................................................. 12 Hydrograph No. 4, Reservoir, ROUTING............................................................................... 13 Hydrograph No. 6, Rational, OFFSITE TO CULVERT.......................................................... 14 100 - Year HydrographReports................................................................................................................. 15 Hydrograph No. 1, SCS Runoff, PRE..................................................................................... 15 Hydrograph No. 2, SCS Runoff, POST.................................................................................. 16 Hydrograph No. 4, Reservoir, ROUTING............................................................................... 17 Hydrograph No. 6, Rational, OFFSITE TO CULVERT.......................................................... 18 IDFReport.................................................................................................................. 19 Watershed Model Schematic Hydraflow Hydrographs Extension for Autodesk® Civil 3138 by Autodesk, Inc. v2020 Leaend Hyd. Origin Description 1 SCS Runoff PRE 2 SCS Runoff POST 4 Reservoir ROUTING 6 Rational OFFSITE TO CULVERT Project: FINAL SWM ROUTING.gpw Tuesday, 02 / 2 / 2021 2 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2020 Tuesday, 02 / 2 / 2021 Hyd. No. 1 PRE Hydrograph type = SCS Runoff Peak discharge = 0.232 Cfs Storm frequency = 1 yrs Time to peak = 720 min Time interval = 2 min Hyd. volume = 772 cult Drainage area = 0.810 ac Curve number = 58" Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 3.02 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 Composite (Area/CN) = [(0.020 x 61) + (0.700 x 55)] 10.810 PRE Q (Cfs) Hyd. No. 1 — 1 Year Q (Cfs) 0.50 0.45 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 000 0.50 0.45 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 000 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Hyd No. 1 Time (min) Hydrograph Report 3 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2020 Hyd. No. 2 POST Hydrograph type = SCS Runoff Storm frequency = 1 yrs Time interval = 2 min Drainage area = 0.460 ac Basin Slope = 0.0 % Tc method = User Total precip. = 3.02 in Storm duration = 24 hrs Composite (Area/CN) = [(0.330 x 98) + (0.190 x 58) + (0.200 x 61)] / 0.460 Q (cfs) 2.00 1.00 0.00 0 120 240 Hyd No. 2 Peak discharge Time to peak Hyd. volume Curve number Hydraulic length Time of conc. (Tc) Distribution Shape factor POST Hyd. No. 2 -- 1 Year Tuesday, 02 / 2 / 2021 = 1.351 cfs = 716 min = 2,750 tuft = 87" = Oft = 5.00 min = Type II = 484 360 480 600 720 840 960 1080 1200 1320 Q (cfs) 2.00 1.00 � 0.00 1440 Time (min) Hydrograph Report 4 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2020 Tuesday, 02 / 2 / 2021 Hyd. No. 4 ROUTING Hydrograph type = Reservoir Peak discharge = 0.010 cfs Storm frequency = 1 yrs Time to peak = 1442 min Time interval = 2 min Hyd. volume = 1,899 cult Inflow hyd. No. = 2 -POST Max. Elevation = 500.35 ft Reservoir name = PIPES Max. Storage = 2,350 cuft Storage Indication method used Q (cfs) 2.00 1.00 0.00 0 600 Hyd No. 4 ROUTING Hyd. No. 4 -- 1 Year 1200 1800 2400 — Hyd No. 2 3000 3600 4200 4800 5400 ® Total storage used = 2,350 cuft Q (cfs) 2.00 1.00 1 0.00 6000 Time (min) Pond Report s Hydratlow Hydrographs Extension for Autodesk® Civil 3DO by Autodesk, Inc. v2020 Tuesday, 02 / 2 / 2021 Pond No. 1 - PIPES Pond Data UG Chambers -Invert elev. = 496.00 ft Rise x Span = 8.00 x 8.00 ft, Barrel Len = 90.00 it, No. Barrels = 1, Slope = 0.50%, Headers = No Stage / Storage Table Stage (ft) Elevation (ft) Contour area (sgft) Incr. Storage (cuft) Total storage (cuft) 0.00 496.00 n/a 0 0 0.85 496.85 n/a 165 165 1.69 497.69 n/a 405 569 2.54 498.54 n/a 515 1,084 3.38 499.38 n/a 575 1,659 4.22 500.23 n/a 604 2,263 5.07 501.07 n/a 604 2,867 5.91 501.92 n/a 576 3,442 6.76 502.76 n/a 514 3,956 7.60 503.61 n/a 404 4,361 8.45 504.45 n/a 164 4,525 Culvert / Orifice Structures [A] [B] [C] [PrfRsr] Rise (in) = 15.00 0.50 0.00 0.00 Span (in) = 15.00 0.50 0.00 0.00 No. Barrels = 1 1 0 0 Invert El. (ft) = 494.00 494.00 0.00 0.00 Length (ft) = 7.00 1.00 0.00 0.00 Slope (%) = 1.00 1.00 0.00 n/a N-Value = .013 .013 .013 n/a Orifice Coeff. = 0.60 0.60 0.60 0.60 Multi -Stage = n/a Yes No No Stage (ft) 10.00 8.00 6.00 4.00 2.00 0.00 0.00 2.00 Total Q Weir Structures [A] Crest Len (ft) = 4.00 Crest EL (ft) = 501.50 Weir Coeff. = 3.33 Weir Type = 1 Multistage = Yes [B] [C] [D] 1.00 Inactive 0.00 500.50 0.00 0.00 3.33 3.33 3.33 Red Red -- Yes No No Exfl.(in/hr) = 0.000 (by Contour) TW Elev. (ft) = 498.10 Note: Culwrtl0rifice ouxfiom are analyzed under inlet (ic) and curet (oc) control. Weir nears checked for orifice conditions tc) and submergence (s). 4.00 Stage / Discharge 8.00 10.00 12.00 14.00 Elev (ft) 506.00 504.00 502.00 500.00 498.00 ' 496.00 16.00 Discharge (cfs) Hydrograph Report I Hydraflow Hydrographs Extension for Autodesk® Civil 3130 by Autodesk, Inc. v2020 Hyd. No. 6 OFFSITE TO CULVERT Hydrograph type = Rational Storm frequency = 1 yrs Time interval = 1 min Drainage area = 26.300 ac Intensity = 2.81 in/hr IDF Curve = IDF GREENBRIER.IDF Peak discharge Time to peak Hyd. volume Runoff coeff. Tc by TR55 Asc/Rec limb fact OFFSITE TO CULVERT Hyd. No. 6 -- 1 Year Tuesday, 02 / 2 / 2021 = 55.43 cfs = n/a = 0 cuft = 0.75 = 16.00 min = 1/1 Q (Cfs) 0.10 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 000 0 10 20 30 40 50 60 Hyd No. 6 Time (min) 7 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2020 Tuesday, 02 / 2 / 2021 Hyd. No. 1 PRE Hydrograph type = SCS Runoff Peak discharge = 0.592 Cfs Storm frequency = 2 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 1,426 tuft Drainage area = 0.810 ac Curve number = 58" Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 3.66 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 Composite (Area/CN) = [(0.020 x 61) + (0.700 x 55)] 10.810 PRE Q (Cfs) Hyd. No. 1 — 2 Year Q (Cfs) 1.00 0.90 0.80 0.70 0.60 0.50 0.40 0.30 0.20 0.10 000 1.00 0.90 0.80 0.70 0.60 0.50 0.40 0.30 0.20 0.10 000 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Hyd No. 1 Time (min) Hydrograph Report I Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2020 Hyd. No. 2 POST Hydrograph type = SCS Runoff Storm frequency = 2 yrs Time interval = 2 min Drainage area = 0.460 ac Basin Slope = 0.0 % Tc method = User Total precip. = 3.66 in Storm duration = 24 hrs Composite (Area/CN) = [(0.330 x 98) + (0.190 x 58) + (0.200 x 61)] / 0.460 Q (cfs) 2.00 1.00 0.00 0 120 Hyd No. 2 Peak discharge Time to peak Hyd. volume Curve number Hydraulic length Time of conc. (Tc) Distribution Shape factor POST Hyd. No. 2 -- 2 Year Tuesday, 02 / 2 / 2021 = 1.773 cfs = 716 min = 3,642 tuft = 87" = Oft = 5.00 min = Type II = 484 240 360 480 600 720 840 960 1080 1200 Q (cfs) 2.00 1.00 � 0.00 1320 Time (min) Hydrograph Report 9 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2020 Tuesday, 02 / 2 / 2021 Hyd. No. 4 ROUTING Hydrograph type = Reservoir Peak discharge = 0.061 cfs Storm frequency = 2 yrs Time to peak = 822 min Time interval = 2 min Hyd. volume = 2,776 cuft Inflow hyd. No. = 2 -POST Max. Elevation = 500.56 ft Reservoir name = PIPES Max. Storage = 2,502 cuft Storage Indication method used Q (Cfs) 2.00 1.00 0.00 0 600 Hyd No. 4 ROUTING Hyd. No. 4 -- 2 Year 1200 1800 2400 — Hyd No. 2 3000 3600 4200 4800 5400 ® Total storage used = 2,502 cuft Q (cfs) 2.00 1.00 1 0.00 6000 Time (min) Hydrograph Report 10 Hydrattow Hydrographs Extension for Autodesk® Civil 3130 by Autodesk, Inc. v2020 Hyd. No. 6 OFFSITE TO CULVERT Hydrograph type = Rational Peak discharge Storm frequency = 2 yrs Time to peak Time interval = 1 min Hyd. volume Drainage area = 26.300 ac Runoff coeff. Intensity = 3.343 in/hr Tc by User IDF Curve = IDF GREENBRIER.IDF Asc/Rec limb fact Q (Cfs) 70.00 .11t 50.00 30.00 20.00 10.00 0.00 — 0 2 4 Hyd No. 6 I OFFSITE TO CULVERT Hyd. No. 6 -- 2 Year Tuesday, 02 / 2 / 2021 = 65.95 cfs = 15 min = 59,353 cuft = 0.75 = 15.00 min = 1/1 Q (Cfs) 70.00 50.00 40.00 30.00 20.00 10.00 N 0.00 8 10 12 14 16 18 20 22 24 26 28 30 Time (min) Hydrograph Report ill Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2020 Hyd. No. 1 PRE Hydrograph type = SCS Runoff Storm frequency = 10 yrs Time interval = 2 min Drainage area = 0.810 ac Basin Slope = 0.0 % Tc method = User Total precip. = 5.52 in Storm duration = 24 hrs ' Composite (Area/CN) = [(0.020 x 61) + (0.700 x 55)] 10.810 Q (cfs) 2.00 1.00 Peak discharge Time to peak Hyd. volume Curve number Hydraulic length Time of conc. (Tc) Distribution Shape factor PRE Hyd. No. 1 -- 10 Year 120 240 360 480 600 720 840 960 Hyd No. 1 Tuesday, 02 / 2 / 2021 = 1.987 cfs = 718 min = 4,040 cuft = 58" = Oft = 5.00 min = Type II = 484 Q (cfs) 2.00 1.00 ' 0.00 1080 1200 1320 1440 1560 Time (min) 12 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2020 Tuesday, 02 / 2 / 2021 Hyd. No. 2 POST Hydrograph type = SCS Runoff Peak discharge = 3.007 Cfs Storm frequency = 10 yrs Time to peak = 716 min Time interval = 2 min Hyd. volume = 6,355 tuft Drainage area = 0.460 ac Curve number = 87" Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 5.52 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 Composite (Area/CN) = [(0.330 x 98) + (0.190 x 58) + (0.200 x 61)] / 0.460 POST Q (Crs) Hyd. No. 2 -- 10 Year Q (Cfs) 4.00 4.00 3.00 3.00 2.00 2.00 1.00 1.00 0.00 0.00 0 120 240 360 480 600 720 840 960 1080 1200 Hyd No. 2 Time (min) Hydrograph Report 13 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2020 Tuesday, 02 / 2 / 2021 Hyd. No. 4 ROUTING Hydrograph type = Reservoir Peak discharge = 1.958 cfs Storm frequency = 10 yrs Time to peak = 720 min Time interval = 2 min Hyd. volume = 5,487 cuft Inflow hyd. No. = 2 -POST Max. Elevation = 501.20 ft Reservoir name = PIPES Max. Storage = 2,954 cuft Storage Indication method used Q (cfs) 4.00 5 11 1.00 0.00 0 120 240 Hyd No. 4 ROUTING Hyd. No. 4 -- 10 Year 360 480 600 — Hyd No. 2 720 Q (cfs) 4.00 3.00 2.00 1.00 0.00 840 960 1080 1200 1320 1440 1560 ® Total storage used = 2,954 cuft Time (min) Hydrograph Report 14 Hydrattow Hydrographs Extension for Autodesk® Civil 3130 by Autodesk, Inc. v2020 Hyd. No. 6 OFFSITE TO CULVERT Hydrograph type = Rational Storm frequency = 10 yrs Time interval = 1 min Drainage area = 26.300 ac Intensity = 4.444 in/hr IDF Curve = IDF GREENBRIER.IDF Peak discharge Time to peak Hyd. volume Runoff coeff. Tc by User Asc/Rec limb fact Tuesday, 02 / 2 / 2021 = 87.66 cfs = 15 min = 78,898 cuft = 0.75 = 15.00 min = 1/1 OFFSITE TO CULVERT Q (Cfs) Hyd. No. 6 -- 10 Year Q (Cfs) 90.00 80.00 70.00 60.00 50.00 40.00 30.00 20.00 10.00 000 90.00 80.00 70.00 60.00 50.00 40.00 30.00 20.00 10.00 000 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 Hyd No. 6 Time (min) Hydrograph Report 15 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2020 Hyd. No. 1 PRE Hydrograph type = SCS Runoff Storm frequency = 100 yrs Time interval = 2 min Drainage area = 0.810 ac Basin Slope = 0.0 % Tc method = User Total precip. = 9.05 in Storm duration = 24 hrs Composite (Area/CN) = [(0.020 x 61) + (0.700 x 55)] 10.810 Q (Crs iv 6.00 5.00 4.00 5 11 r 11 1.00 Peak discharge Time to peak Hyd. volume Curve number Hydraulic length Time of conc. (Tc) Distribution Shape factor Tuesday, 02 / 2 / 2021 = 5.347 cfs = 718 min = 10,732 cult = 58" = Oft = 5.00 min = Type II = 484 Q (Cfs) 6.00 5.00 4.00 3.00 2.00 1.00 0.00 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Hyd No. 1 Time (min) 16 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2020 Tuesday, 02 / 2 / 2021 Hyd. No. 2 POST Hydrograph type = SCS Runoff Peak discharge = 5.329 cfs Storm frequency = 100 yrs Time to peak = 716 min Time interval = 2 min Hyd. volume = 11,701 cuft Drainage area = 0.460 ac Curve number = 87" Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 9.05 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 Composite (Area/CN) _ [(0.330 x 98) + (0.190 x 58) + (0.200 x 61)] / 0.460 Q (cfs 6.00 5.00 4.00 3.00 2.00 1.00 POST Hyd. No. 2 -- 100 Year Q (cfs) 6.00 5.00 4.00 3.00 2.00 1.00 0.00 0.00 0 120 240 360 480 600 720 840 960 1080 1200 — Hyd No. 2 Time (min) Hydrograph Report 17 Hydraflow Hydrogral Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2020 Hyd. No. 4 ROUTING Hydrograph type = Reservoir Peak discharge Storm frequency = 100 yrs Time to peak Time interval = 2 min Hyd. volume Inflow hyd. No. = 2 -POST Max. Elevation Reservoir name = PIPES Max. Storage Storage Indication method used. K6llj111lkiCC! Tuesday, 02 / 2 / 2021 = 5.242 cfs = 718 min = 10,833 tuft = 501.68 ft = 3,279 cuff 5.00 ------ ----- 1 1 ------ ----- 4. ------ ----- ------ ----- ------ ----- 11�JJJ'111�111 Jill ------ ----- 11 1 11 1 1 •1 •1 :1 •11 1 1 ••1 1:1 11 1 Hydrograph Report 18 Hydrattow Hydrographs Extension for Autodesk® Civil 3130 by Autodesk, Inc. v2020 Hyd. No. 6 OFFSITE TO CULVERT Hydrograph type = Rational Peak discharge Storm frequency = 100 yrs Time to peak Time interval = 1 min Hyd. volume Drainage area = 26.300 ac Runoff coeff. Intensity = 6.205 in/hr Tc by User IDF Curve = IDF GREENBRIER.IDF Asc/Rec limb fact Q (cfs) 140.00 120.00 100.00 40.00 20.00 0.00 — 0 2 4 Hyd No. 6 I OFFSITE TO CULVERT Hyd. No. 6 -- 100 Year Tuesday, 02 / 2 / 2021 = 122.38 cfs = 15 min = 110,146 cuft = 0.75 = 15.00 min = 1/1 Q (cfs) 140.00 120.00 100.00 40.00 20.00 I I I I I I I I I I I N 0.00 8 10 12 14 16 18 20 22 24 26 28 30 Time (min) Hydraflow Rainfall Report Hydra0ow Hydrographs Extension for Autodesk® Civil 3130 by Autodesk, Inc. v2020 Return Period Intensity -Duration -Frequency Equation Coefficients (FHA) (Yrs) B D E (NIA) 1 0.0000 0.0000 0.0000 --- 2 45.4497 10.2000 0.8087 ----- 3 0.0000 0.0000 0.0000 ------- 5 44.4594 10.1000 0.7490 ------- 10 45.9191 10.1000 0.7246 ------- 25 49.7046 10.2000 0.7037 ------- 50 53.1255 10.3000 0.6926 ------- 100 56.6703 10.4000 0.6838 ----- File name: OF GREENBRIER.IDF Intensity = B I (Tc + D)AE Tuesday, 02 / 2 / 2021 Return Period Intensity Values (inthr) (Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 SO 1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 5.03 4.00 3.34 2.89 2.55 2.29 2.08 1.91 1.77 1.65 1.55 1.46 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 5.82 4.70 3.98 3.47 3.09 2.80 2.56 2.37 2.21 2.07 1.95 1.84 10 6.42 5.22 4.44 3.90 3.49 3.16 2.91 2.69 2.51 2.36 2.23 2.11 25 7.32 5.99 5.13 4.52 4.06 3.69 3.40 3.16 2.95 2.78 2.63 2.49 50 8.03 6.60 5.67 5.00 4.50 4.11 3.79 3.52 3.30 3.11 2.94 2.79 100 8.74 7.21 6.20 5.49 4.94 4.52 4.17 3.88 3.64 3.43 3.25 3.09 Tc = time in minutes. Values may exceed 60. eDrive - 30scale\30 Scale Work\CHITS\19.018 - Greenbder\WOWAUTOCAD\EVENT MANAGER GREENBRIER.DCD Storm Rainfall Precipitation Table (in) Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr SCS 24-hour 3.02 3.66 0.00 3.30 5.52 5.77 6.80 9.05 SCS 6-Hr 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff -1st 0.00 0.00 0.00 2.75 0.00 0.00 6.50 0.00 Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Custom 0.00 0.00 0.00 2.80 0.00 0.00 6.00 0.00