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HomeMy WebLinkAboutWPO201900060 Calculations 2019-10-22UVA Foundation – 1725 Discovery Drive COUNTY OF ALBEMARLE, VIRGINIA VSMP DESIGN CALCULATIONS & NARRATIVE OCTOBER 21, 2019 Prepared by: Craig Kotarski, PE Timmons Group 608 Preston Ave, Suite 200 Charlottesville, VA 22903 434.327.1688 Table of Contents Section Title 1 Project Narrative 2 Pipe and Inlet Computations 3 Stormwater Management Exhibit for Pond 1 4 Drainage Subbasin Map – Developed Condition, Flat Branch – Tributary to North Fork Rivanna River, UVA Research Park at North Fork Project Narrative: This project will be constructed in two phases. The first phase includes the construction of a building addition, bioretention ponds, and associated utilities, drainage, and landscaping. The limits of disturbance totals 0.45 acres for this phase. The second phase includes the construction of additional parking spaces and associated drainage and landscaping. The limits of disturbance totals 0.84 acres for this phase. The total limits of disturbance for this project totals 1.29 acres. Stormwater Management Summary: Per the document “Stormwater Management / BMP Analysis and Floodplain Study for the UVA Research Park at Northfork” by Dewberry & Davis, October 1997, the UVA Research Park ponds have been master planned to handle both stormwater quantity and quality for the future build-out of the research park. This development drains through Analysis Point 1 (shown on the plans) and ultimately outfalls to the large wet pond, designated Pond 1, to the southeast of the site. This pond was designed to meet quantity and quality requirements for the future build-out of the research park, which includes the subject property. This pond is referred to as Pond 1 on SDP 199800043. For the approved drainage areas and CNs, see Drainage Subbasin Map – Developed Condition, Flat Branch – Tributary to North Fork Rivanna River, UVA Research Park at North Fork. The proposed development was analyzed to determine the change in the existing impervious and pervious quantities on site. These values have been incorporated into the previously-approved CN for the overall drainage area to Pond 1. Because of the small scale of the project (net +0.73 acres of impervious area) compared to the 83.90-acre overall drainage area, the CN is unchanged due to this development. Therefore, both water quantity and quality for this project will be handled through the existing wet pond. FORM LD 204STORMWATER INLET COMPUTATIONSSHEET 1 OF 2ROUTEPROJECTUVAF DISCOVERY DRIVEDESIGNER:KAMDATE10/18/2019CHECKED:UNITSENGLISHINLETSag Inlets OnlyNUMBERTYPELENGTH (FT; M)STATIONDRAINAGE AREA (AC; HA)CCASCAI (IN/HR; mm/HR)Q INCR. (CFS; CMS)Qc CARRYOVER (CFS; CMS)QT GUTTER FLOW (CFS; CMS)S GUTTER SLOPE (FT/FT; M/M)Sx CROSS SLOPE (FT/FT; M/M)T (SPREAD) (FT; M)W (GUTTER WIDTH) (FT; M)W/TSw (GUTTER SLOPE) (FT/FT; M/M)Sw/SxEo (App. 9C-8)a S'wSeCOMPUTED LENGTH LT (FT; M)L, SPECIFIED LENGTH (FT; M)L/LT E (App. 9C-18)Q INTERCEPTED (CFS; CMS) or d/hQb CARRYOVER (CFS; CMS)Depth at Curb (IN; MM)Allowable Ponding Depth d (FT; M)Height of Curb Opening h (FT; M)d/hDepth at Inlet (IN; MM) T SPREAD @ SAG (FT; M)REMARKS100 DI-3B 4.000 0.230 0.90 0.2070'RIGHT 0.070 0.35 0.02450.232 4 0.928 0 0.928 0.0100 0.0208 4.896 2.000 0.4085 0.0833 4.0048 0.893 3.50 0.1458 0.1511 5.641 4.000 0.709 0.892 0.827 0.101 2.722102 DI-3A 8.000 0.200 0.90 0.180'RIGHT 0.020 0.35 0.0070.187 4 0.748 0 0.748 0.0100 0.0208 4.185 2.000 0.4779 0.0833 4.0048 0.938 3.50 0.1458 0.1575 5.025 8.000 1.592 1.000 0.748 0.000 2.545200 DI-3B 4.000 0.140 0.90 0.1260'RIGHT 0.070 0.35 0.02450.151 4 0.604 0 0.604 0.0100 0.0208 3.495 2.000 0.5722 0.0833 4.0048 0.972 3.50 0.1458 0.1625 4.508 4.000 0.887 0.980 0.592 0.012 2.372202 DI-3B 8.000 0.200 0.90 0.180'RIGHT 0.020 0.35 0.0070.187 4 0.748 0 0.748 0.0100 0.0208 4.185 2.000 0.4779 0.0833 4.0048 0.938 3.50 0.1458 0.1575 5.025 8.000 1.592 1.000 0.748 0.000 2.545204 DI-1 2.0000 4 0 0Back/Lt.0.000'RIGHT1.420 0.35 0.497Ahead/Rt.0.497 4 1.988 0Ahead/Rt.1.988 0.001 2.0002 1.9883.619 T > 8.0 ftEX1 DI-3B 4.000 0.200 0.90 0.180'RIGHT 0.070 0.35 0.02450.205 4 0.82 0 0.820 0.0100 0.0208 4.486 2.000 0.4458 0.0833 4.0048 0.920 3.50 0.1458 0.1549 5.276 4.000 0.758 0.922 0.756 0.064 2.620EX2 DI-3B 4.000 0.210 0.90 0.1890'RIGHT 0.100 0.35 0.0350.224 4 0.896 0 0.896 0.0100 0.0208 4.780 2.000 0.4184 0.0833 4.0048 0.901 3.50 0.1458 0.1522 5.534 4.000 0.723 0.901 0.807 0.089 2.693EX3 DI-3B 4.000 0.200 0.90 0.180'RIGHT 1.100 0.35 0.3850.565 4 2.26 0 2.260 0.0100 0.0208 8.133 2.000 0.2459 0.0833 4.0048 0.675 3.50 0.1458 0.1192 9.451 4.000 0.423 0.629 1.421 0.839 3.530T > 8.0 ftEX4 DI-3A 4.000 0.300 0.90 0.270'RIGHT 1.190 0.35 0.41650.687 4 2.748 0 2.748 0.0100 0.0208 8.939 2.000 0.2237 0.0833 4.0048 0.628 3.50 0.1458 0.1124 10.628 4.000 0.376 0.573 1.573 1.175 3.731T > 8.0 ftEX5 DI-3A 6.000 1.530 0.35 0.53550'RIGHT 0.536 4 2.144 0 2.144 0.0100 0.0208 7.923 2.000 0.2524 0.0833 4.0048 0.688 3.50 0.1458 0.1211 9.157 6.000 0.655 0.853 1.829 0.315 3.477EX6 DI-3B 4.000 0.150 0.90 0.1350'RIGHT 0.190 0.35 0.06650.202 4 0.808 0 0.808 0.0100 0.0208 4.438 2.000 0.4507 0.0833 4.0048 0.923 3.50 0.1458 0.1553 5.234 4.000 0.764 0.926 0.748 0.060 2.608EX7 + RDs DI-3A 4.000 1.070 0.90 0.9630'RIGHT 0.150 0.35 0.0525INLETSOFT BY ENSOFTECDATE: 10/18/2019 FORM LD 204STORMWATER INLET COMPUTATIONSSHEET 2 OF 2ROUTEPROJECTUVAF DISCOVERY DRIVEDESIGNER:KAMDATE10/18/2019CHECKED:UNITSENGLISHINLETSag Inlets OnlyNUMBERTYPELENGTH (FT; M)STATIONDRAINAGE AREA (AC; HA)CCASCAI (IN/HR; mm/HR)Q INCR. (CFS; CMS)Qc CARRYOVER (CFS; CMS)QT GUTTER FLOW (CFS; CMS)S GUTTER SLOPE (FT/FT; M/M)Sx CROSS SLOPE (FT/FT; M/M)T (SPREAD) (FT; M)W (GUTTER WIDTH) (FT; M)W/TSw (GUTTER SLOPE) (FT/FT; M/M)Sw/SxEo (App. 9C-8)a S'wSeCOMPUTED LENGTH LT (FT; M)L, SPECIFIED LENGTH (FT; M)L/LT E (App. 9C-18)Q INTERCEPTED (CFS; CMS) or d/hQb CARRYOVER (CFS; CMS)Depth at Curb (IN; MM)Allowable Ponding Depth d (FT; M)Height of Curb Opening h (FT; M)d/hDepth at Inlet (IN; MM) T SPREAD @ SAG (FT; M)REMARKS1.016 4 4.064 0 4.064 0.0100 0.0208 10.693 2.000 0.187 0.0833 4.0048 0.541 3.50 0.1458 0.0997 13.462 4.000 0.297 0.470 1.910 2.154 4.169T > 8.0 ftINLETSOFT BY ENSOFTECDATE: 10/18/2019 LD-229PROJECT:UVAF DISCOVERY DRIVEDesigned by: KAMSTORM SEWER DESIGN COMPUTATIONSLOCATION: ALBEMARLE COUNTYCOUNTY: CharlottesvilleChecked by:STORM FREQUENCY10UNITSENGLISHDRAIN. RUNOFF CA RAIN RUNOFF INVERT ELEVATIONS LENGTH SLOPE SIZE SHAPE Number Capacity Friction NORMAL FLOWPIPE FROM POINT TO POINT AREA COEFF. INCRE- ACCUM- INLET FALL Lateral Total Q UPPER LOWER of Pipe (Dia. Or of Pipes Slope Depth of Area of Hrn Vn En INCRE-ACCUMUNO. REFERENCE STA. REFERENCE STA. "A" "C" MENT ULATED TIME END END Span/Rise)Flow, dn Flow, An MENT -LATEDREMARKSAcre Minutes In/Hr CFS CFS Ft. Ft./Ft. In. CFS Ft./Ft. Ft. SqFt Ft. Ft/Sec Ft. Minutes Minutes(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15)(16) (17) (17) (18)100 TO EX3 100 EX30.30 0.77 0.23 0.42 5.19 6.48 0.00 2.72 543.98 541.00 91.00 0.03275 18Circular1 20.59 0.00060 0.37 0.34 0.22 8.08 1.38 0.19 5.38101 102 1000.22 0.85 0.19 0.19 5.00 6.54 0.00 1.22 548.50 546.92 63.00 0.02508 18Circular1 16.64 0.00010 0.28 0.22 0.17 5.50 0.75 0.19 5.19200 TO EX4 200 EX40.21 0.72 0.15 0.84 5.31 6.44 0.00 5.38 546.37 544.20 96.00 0.02260 15Circular1 10.52 0.00620 0.63 0.62 0.32 8.62 1.79 0.19 5.49201 202 2000.22 0.85 0.19 0.68 5.17 6.49 0.00 4.44 548.00 546.74 63.00 0.02000 15Circular1 9.14 0.00490 0.61 0.60 0.31 7.39 1.46 0.14 5.31203 204 2021.42 0.35 0.50 0.50 5.00 6.54 0.00 3.25 554.00 549.62 88.00 0.04977 15Circular1 14.41 0.00260 0.40 0.34 0.23 9.49 1.80 0.16 5.16EX1 TO OUT EX10.27 0.76 0.21 4.68 6.54 6.08 0.00 28.72 526.42 524.99 35.00 0.04086 30Circular1 89.82 0.00430 0.97 1.77 0.52 16.28 5.09 0.04 6.58EX2 TO EX7 EX2 EX7 + RDs0.31 0.72 0.22 1.21 5.60 6.54 0.00 7.90 537.71 534.08 125.00 0.02904 24Circular1 41.76 0.00110 0.59 0.77 0.34 10.22 2.21 0.20 5.80EX3 TO EX2 EX3 EX21.30 0.44 0.57 0.98 5.38 6.54 0.00 6.44 540.90 537.75 124.00 0.02540 18Circular1 18.14 0.00330 0.62 0.69 0.33 9.39 1.99 0.22 5.60EX4 TO EX5 EX4 EX51.49 0.46 0.69 1.52 5.49 6.38 0.00 9.77 543.40 543.15 89.00 0.00281 24Circular1 12.99 0.00170 1.29 2.15 0.58 4.54 1.61 0.33 5.82EX5 TO EX6 EX5 EX61.53 0.35 0.54 2.06 5.82 6.54 0.00 13.46 543.05 540.51 135.00 0.01881 24Circular1 33.61 0.00310 0.88 1.33 0.46 10.11 2.47 0.22 6.04EX6 TO EX7 EX6 EX7 + RDs0.32 0.61 0.20 2.25 6.04 6.54 0.00 14.74 540.28 534.08 205.00 0.03024 24Circular1 42.62 0.00380 0.81 1.20 0.43 12.32 3.17 0.28 6.32EX7 TO EX1 EX7 + RDs EX11.22 0.83 1.02 4.48 6.32 6.14 0.00 27.48 533.86 531.99 138.00 0.01355 24Circular1 28.53 0.01310 1.58 2.66 0.61 10.34 3.24 0.22 6.54FLOW TIME LD-347PROJECT:UVAF DISCOVERY DRIVEDESIGNED BY: KAMHYDRAULIC GRADE LINE ANALYSISChecked:INCIDENCE PROBABILITY 10 YearINVERT DEPTH OUTLET DIA. DESIGN LENGTH FRICTION FRICTION JUNCTION LOSSAdj. Ht Inlet Inlet Top of MHINLET STA. EL. OF FLOW WATER PIPE DISCH. PIPE SLOPE, Sfo LOSS Contr. Hi (Expn) SKEW Bend Sum SURFACE 1.3 Shaping? 0.5 FINAL Water Top of Inlet Adjustment?OR OUTFLOW OUTFLOW SURFACE Do Qo Lo (FT/FT) Hf Vo Ho Vi Vi*2/2g 0.35*MAX. Angle K H HL FLOW Ht Ht H Surface Elev.JUNCTION PIPE PIPE ELEV. (In/mm) (CFS/CMS) (Ft/M) (M/M) (Ft/M) (Ft/M) (Vi2/2g) (Ft/M) (Ft/M) (Ft/M) Y/N (Ft/M) (Ft/M) Elevation APPROX.(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) (16) (17) (18) (19)EX1524.990EX7 + RDs 531.990 2.00 533.590 24 27.475 138.00 0.01314 1.813 10.343 0.415 12.323 2.358 0.825 0.0 0.00 0.000 1.241 6.235 1.613 YES 0.806 2.619 536.209 544.660 O.K.EX6 534.080 2.00 536.209 24 14.739 205.00 0.00378 0.775 12.323 0.590 10.106 1.586 0.555 0.0 0.00 0.000 1.145 1.276 1.145 YES 0.572 1.347 541.091 551.610 O.K.EX5 540.510 2.00 542.110 24 13.463 135.00 0.00315 0.426 10.106 0.396 4.541 0.320 0.112 0.0 0.00 0.000 0.509 3.507 0.661 YES 0.331 0.756 543.930 554.810 O.K.EX4 543.150 2.00 544.750 24 9.765 89.00 0.00166 0.148 4.541 0.080 8.621 1.154 0.404 0.0 0.00 0.000 0.484 4.386 0.629 YES 0.315 0.462 545.212 548.150 O.K.200 544.200 1.25 545.212 15 5.379 96.00 0.00618 0.593 8.621 0.289 7.391 0.848 0.297 0.0 0.00 0.000 0.585 0.973 0.585 YES 0.293 0.886 547.003 552.410 O.K.202 546.740 1.25 547.740 15 4.438 63.00 0.00493 0.311 7.391 0.212 9.485 1.397 0.489 0.0 0.00 0.000 0.701 1.213 0.911 YES 0.456 0.766 548.614 555.350 O.K.204 549.620 1.25 550.620 15 3.251 88.00 0.00265 0.233 9.485 0.349 0.000 0.000 0.000 0.0 0.00 0.000 0.349 3.251 0.454 YES 0.227 0.460 554.404 560.600 O.K.EX2 534.080 2.00 536.209 24 7.903 125.00 0.00109 0.136 10.218 0.405 9.389 1.369 0.479 0.0 0.00 0.000 0.884 1.465 0.884 YES 0.442 0.578 538.299 542.540 O.K.EX3 537.750 1.50 538.950 18 6.437 124.00 0.00334 0.415 9.389 0.342 8.082 1.014 0.355 0.0 0.00 0.000 0.697 3.696 0.906 YES 0.453 0.868 541.517 547.760 O.K.100 541.000 1.50 542.200 18 2.721 91.00 0.00060 0.054 8.082 0.254 5.501 0.470 0.164 0.0 0.00 0.000 0.418 1.503 0.543 YES 0.272 0.326 544.348 552.380 O.K.102 546.920 1.50 548.120 18 1.223 63.00 0.00014 0.009 5.501 0.117 0.000 0.000 0.000 0.0 0.00 0.000 0.117 1.223 0.153 YES 0.076 0.085 548.775 556.120 O.K. BARN FOOT BRIDGEFOOT BRIDG E CONC CONC CONC CONC CONC CONC CONC CONC CONCSHED #3655 1 STY. W / BASEM E N T RESID E N C E #3640 1 STY. W / C E L L A R RESIDE N C E METAL G A R A G E 1 STY. BLDG. ELEC. T R A N S . SSCO TOP=50 1 . 5 6 INV.=49 7 . 9 ' ± 47.53 76 AREA G1 49.25 72 AREA G2 64.94 53 AREA F1 30.73 47 AREA F2 28.71 55 AREA E1 17.28 0.83 AREA E2 81.90 70 AREA D2 83.90 67 AREA C2 31.15 42 AREA C1 49.59 50 AREA B1 47.79 67 AREA B2 11.76 55 AREA A2 56.35 60 AREA A1 9.55 51 AREA D1 NAD 8 3 0 SCALE 1"=300' 600'300' December 19, 2018 LEWIS AND CLARK DRIVE - STORMWATER MANAGEMENT EXHIBIT FOR POND 1 LEGEND HYDROLOGIC SOIL GROUP A, TURF HYDROLOGIC SOIL GROUP A, WOODS HYDROLOGIC SOIL GROUP B, TURF HYDROLOGIC SOIL GROUP B, WOODS HYDROLOGIC SOIL GROUP C, TURF HYDROLOGIC SOIL GROUP C, WOODS HYDROLOGIC SOIL GROUP D, TURF HYDROLOGIC SOIL GROUP D, WOODS IMPERMEABLE SURFACES 28.71 55 AREA E1 NOTE: DRAINAGE DIVIDES AND AREA NAMES ARE TAKEN FROM "STORMWATER MANAGEMENT/BMP ANALYSIS AND FLOODPLAIN STUDY FOR THE UVA RESEARCH PARK AT NORTHFORK" BY DEWBERRY & DAVIS, DATED OCTOBER 1997. DRAINAGE DIVIDE AREA NAME CN VALUEAREA, IN ACRES POND 1 I 1 t S I I 411 1 o o T y1_ 1 I I 1 r 1 P, 1' TI e 2317 Sq K {, p 0 J \\ IIISN' r a o 1 r 1 1 MI 15 062 SUBBASIN D2 I _ Nye a Ir 8403 Ac. G _ 0.1313 Sq- Mi. 11'"' , 1 0.3401 SKm. SL be=0079 )5u 51 1 CN00 O,OI93 1 . 0,0499OEC SUBBA INFI 2780Al- i--. 26 1 t - ` i " 0.0434 Sq. Mi x O."S . Km Lc= . o y" 54 per_ F 0.1125 Sq, Km CN 27 SUBBASINFi 66Ac. 01038 5q. Mi. u0.2689 59. Km. CN-0.067 1 CN=9i SUBBASIN F2 yy 31.64 Ac9UBBASIN&2 \ 0.0494 sq Mi.. t1+f > 49-OSA 0.128D Sq Km.,_- 007GGSq..Mi. ` tc = 0041 0 1984 Sq.. Km 1 CN= 91 - tc 0.058 40 4 I C 245X11 1 57 - _ "- 1..-- - t 41 SUBBASIN 61 48.90AD 45 00764 Sq. Mi. O.I97q Sq. Km. N.. j DRAINAGE SUBBASIN AAP - DEVELOPED CONDITION FLAT BRANCH - TRIBUTAW TO NORTH FORK RIVANNA RIVER UVA RESEARCH PORK AT NORTH FORK UNC OF VIRGINIA DATE: 7/23/97 SCALE: T • 200'(12,400) _ REAL ESTATE FOUNDATION TU7[IPI HE gh. & Co.p y PIEPARED FOR DYwberry&DRI UREF North Fork Business Park NOv 1 1991 PREPARED BY: Dewberry & Davis "`°"