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HomeMy WebLinkAboutWPO202300021 Calculations 2023-04-04UVA Community Credit Union ALBEMARLE COUNTY, VIRGINIA WPO PLAN DESIGN CALCULATIONS & NARRATIVE APRIL 3, 2023 0 • TIMMONS GROUP YOUR VISION ACHIEVED THROUGH OURS. Prepared by: Kevin Flynn, PE Timmons Group 608 Preston Avenue, Suite 200 Charlottesville, VA 22903 434.327.1699 L KEVIN E. FLYNN Lic. No. 53836 Table of Contents Section Title 1. Project Narrative 2. LD-204 Inlet Calculations 3. LD-229 Pipe Calculations 4. LD-347 Hydraulic Grade Line Analysis 5. Virginia Runoff Reduction Method Worksheet Summary 6. Pre -Developed Routing Calculations 7. Post Developed Routing Calculations 8. NRCS Soil Report 9. NOAA Atlas 14 Rainfall Report Project Narrative: This project includes an addition onto an existing office building and improvements to the existing parking, circulation, and drainage onsite. The limits of disturbance is 1.66 acres. Water Quality: The current site is an existing office building with associated parking. 1.66 acres was analyzed for water quality. The total TP load reduction requirement is 0.61 lbs/year. The 0.61 Ibs/yr of required nutrient credits shall be purchased from a DEQ-Approved Nutrient Credit Bank in accordance with VA code 62.1-44.15:35. Water Quantity The majority of the existing site is conveyed to an existing 72" underground detention that is located in the lower east parking lot. The overall analysis point for the site is located in the existing underground detention system, upstream of the outfall structure. In the proposed condition, a new underground detention system will be installed on the north side of the building, upstream from the existing detention pipe. A portion of the disturbed and undisturbed areas will be conveyed to the new detention pipe, and the remaining disturbed and undisturbed areas of the site will flow directly to the existing underground detention system. Channel protection requirements are met by meeting energy balance with the proposed underground detention system detaining the 1-year 24- hour storm. Additionally, flood protection requirements are met by detaining the post 10- year 24-hour storm to be less than the pre -developed 10-year 24-hour storm, in accordance with 9VAC25-670-66, Section C.3.c. See sheets C6.0 and C6.1 for the Stormwater Management Plan. FORM LO 2N STORMWATER INLET COMPUTATIONS SHEET 1 OF PROJECT UVA COMMUNITY CREDIT UNION GATE �3 UNITS.NGLISH mmm�mmm®omomm�mm�m�mmmmmmmmmm®mm��m� ��m�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m� mmm�mmmmomommm®mmm®mmmm®mmm®m®mm��m� ��m�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m� mmm�mmm®omo®®m®mm�®m®®mmm®mmm®mm��m� ��m�m®�mmmmmmmmmmmmmmmmmmmmmmmmm��m� mmm�mmmmomom��mmmm�mmmm®mmmmmmmm��m� ��m�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmomomm�mm�m�mmmmmmmmmmmmm��m mmm�mmm0000mmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmmmmmmmmmmmmmm®mmmmmmm�mtm� ®�m�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmomom��®mm�om®mmmmmmmmmmm��m mmm�mmm0000mmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmm�mmmmmmmmmmmommmm®mm�®®� ®�m�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmommmm�®mmm�mmmmmmmmmmmmm��m mmm�mmmmmmm®mmmmmmmmmmmmommmmmmmmt®mom ®�m�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m� mmm�mmmmo®om��®mmm�mmmmmmmm®m®mm��m� ��m�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m� mmm�mmmm®mo®®�®mom®m®®mmmmmmm®mm��m� ®�m�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmomomm�mmmm®m®mmmmmmmmmmm��m mmm�mmm0000mmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmmmmmmmmmmmmmmommmm®mmmt®mom ®�m�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m� mmm�mmmmo®o®®�mm�m®m®®mmmmmmmmmm��m� INLETSOFT RY ENSOFTEC DATE A3(lpTd STORM SEWER DESIGN COMPUTATIONS STORM FREQUENCY 10 PROJECT: UVA Credit Union Designed by: K.B Checked by: K.F. UNITS ENGLISX PIPE NO FROM POINT TO POINT DRAM. AREA RUNOFF COEFF. C. (d) CA TOTAL INLET TIME Minutes (7) RAM FALL lr H (8) RUNOFF Q us (9) INVERT ELEVATIONS LENGTH of Pipe Ft (12) SLOPE FtIFt (13) SIZE (Du. On SpW -) In (Id) SHAPE Cap ny FES (15) FnMon SI ape FtIFt VEL V. FUSec (16) FLOW TIME M. (17) REMARKS (Is) INCRE- MENT (5) ADDTL CA ACCUM- ULATED (6) UPPER END (10) LOWER END (11) REFERENCE (1) STA. REFERENCE (2) STA_ "A' Acre (3) 207 208 206 0.060 0300 0018 0000 0018 0000 5920 0.107 623281 In 560 69611 0015 12M C.W. 4725 0000 2176 0333 205 206 206 0.000 0.000 0000 0000 0018 0.333 5920 0.107 632439 622.000 23.SW 0.016 12M Cnuiar 5001 0000 2575 0169 201 202 200 0.000 0.000 0000 0000 0018 26% 5920 0.107 617360 416.810 53416 Onto 15000 CimWar 4609 0000 1557 0572 Ren now on. EGO EX 200 200.0 0.000 0.000 0000 0000 0000 0Ono 5920 0000 616810 411.860 192018 0.026 ISM Omuta 10369 0000 0000 0000 213 216 212 0.230 0580 0.133 0000 0.133 0Ono 5920 0.T10 620990 619610 138021 0.010 ISM C. a 6996 0000 3]BS 0608 211 212 2In 0.380 0660 0251 0000 0384 0608 5920 22]d 619509 617990 151910 0.010 ISM Omuta 6.9% 0001 5.105 M% 209 210 2090 0.510 0880 0669 0000 0.833 1IN 5920 6.931 6178% 617500 38569 0.010 ISM CimWsr 6.9% 0005 6192 0.106 219 no 219 ONO 0900 0036 0000 0036 0000 5920 0213 627012 622.990 d6.686 0090 8000 Omuta 3.925 0000 6019 0.126 21] 218 216 0000 0000 0000 0000 0036 0.126 5920 0213 622889 62095] 39663 0069 8000 CimWar 2888 0000 6850 0.136 107 108 106 0030 0750 0023 0000 0023 0000 5920 0.133 633203 618710 56.167 0080 12M O.W. 10913 0000 4769 0.197 105 106 IN 00% 0800 0072 0000 0095 0.197 5920 0.559 628398 621 Add 86.925 0080 12M Omuta 10913 0000 7311 0198 103 IN 102 0.Ito 0300 0033 0000 0.128 0.395 5920 0755 631367 619321 25325 0080 12M Omuta 10913 0000 7990 0053 101 102 STR EX 0_ISO 0690 0.126 0000 0252 0668 5920 14% 418.854 616000 67573 0060 12M Omuta 9451 0001 8799 00% EX STR Ex STR EX 0370 0450 0.167 0000 0618 0.538 5920 2676 615.300 613026 157591 0010 ISM Omuta 1137 0000 5.159 0509 Channel Report Hydraflow Express Extension for Autodesk® Civil 3138 by Autodesk, Inc. 201 Circular Diameter (ft) = 1.25 Invert Elev (ft) = 417.34 Slope (%) = 1.00 N-Value = 0.012 Calculations Compute by: Known Q Known Q (cfs) = 6.64 Elev (ft) 419.00 418.50 418.00 417.50 417.00 416.50 Highlighted Depth (ft) Q (cfs) Area (sqft) Velocity (ft/s) Wetted Perim (ft) Crit Depth, Yc (ft) Top Width (ft) EGL (ft) Section Friday, Mar 31 2023 = 0.97 = 6.640 = 1.02 = 6.48 = 2.70 = 1.04 = 1.04 = 1.62 0 1 2 3 Reach (ft) Channel Report Hydraflow Express Extension for Autodesk® Civil 3138 by Autodesk, Inc. EX 1 Circular Diameter (ft) = 1.25 Invert Elev (ft) = 411.86 Slope (%) = 2.58 N-Value = 0.013 Calculations Compute by: Known Q Known Q (cfs) = 6.64 Highlighted Depth (ft) Q (cfs) Area (sqft) Velocity (ft/s) Wetted Perim (ft) Crit Depth, Yc (ft) Top Width (ft) EGL (ft) Friday, Mar 31 2023 = 0.73 = 6.640 = 0.74 = 8.92 = 2.17 = 1.04 = 1.23 = 1.97 Elev (ft) Section C 414.00 2.' 413.50 413.00 412.50 412.00 411.50 411.00 I 1 2 Reach (ft) i 4 1.f 1.' 0A 0.' -0. -0 PROJECT: 56900 UVA Credit Union DESIGNED BY: KB HYDRAULIC GRADE LINE ANALYSIS Checked: K.B INCIDENCE PROBABILITY 10 Year INLET OR JUNCTION INLET STATION OUTLET WATER SURFACE ElEV DIA PIPE Do (In) DESIGN DISCH. Go (CFS) LENGTH PIPE Lo (ED FRICTION SLOPE. St (FT/M FRICTION LOSS Hf (ED JUNCTION LOSS FINAL H (R) INet Waled Sutler Elevatlm RM Ek Coom Vo Ho (ED pl N DM N42g HI Angle HA M IS M n5 M 200 10+00.00 412.86 15 0.00 192.02 0.0000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0 TRUE 0.00 412.86 424.03 OK -11.17 202 10+53.42 417.81 15 0.11 53.42 0.0000 0.00 1.56 0.01 0.11 1.15 0.12 0.02 0.01 49.46 0.01 0.03 0 TRUE 0.01 417.82 426.41 OK -8.58 204 12+04.94 421.80 72 0.11 151.53 0.0000 0.00 1.15 0.01 0.11 2.58 0.27 0.10 0.04 81.17 0.06 0.10 0 TRUE 0.05 421.85 426.31 OK 4.46 206 12+31.06 422.80 12 0.11 26.12 0.0000 0.00 2.58 0.03 0.11 2.48 0.26 0.10 0.03 8.37 0.01 0.07 0 TRUE 0.04 422.84 427.19 OK 4.36 208 12+80.47 423.34 12 0.11 49.41 0.0000 0.00 2.48 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.03 FALSE 0.03 423.37 426.81 OK -3.44 210 10+52.26 418.50 15 4.93 38.57 0.0050 0.19 6.19 0.15 2.27 5.10 11.61 0.40 0.14 90.72 0.28 0.57 0.75 TRUE 0.56 419.06 423.14 OK 4.07 212 12+p4.1] 419.06 15 2.2] 151.91 0.0011 0.16 5.10 0.10 0.79 3.78 2.99 0.22 0.08 73.09 0.14 0.31 0.41 TRUE 0.36 419.43 424.19 OK 4.76 214 13+42.19 420.61 15 0.]9 138.02 0.0001 0.02 3.]8 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.06 0.07 FALSE 0.09 420.70 426.23 OK -5.53 218 10+51.85 421.49 8 0.21 39.66 0.0003 0.01 4.85 0.09 0.21 6.02 1.28 0.56 0.20 63.08 0.32 0.Bo 0.00 TRUE 0.31 421.80 426.27 OK 4.47 220 10+96.54 423.52 8 0.21 44.69 0.0003 0.01 6.02 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.18 FALSE 0.19 1 423.72 1 433.22 1 OK -9.5 STR EX 1 10+Ip.00 414.92 18 2.48 15].59 0.'05 0.0] 5.16 0.10 1.1 8.80 13.11 1.20 0.1 70.90 0.73 1.26 1.63452 TRUE 0.89 415.82 420.99 OK -5.17 102 10+4].5] 416.80 12 1.49 4].5] 0.0015 0.0] 8.80 0.30 0.]5 ].99 6.03 0.99 0.35 3].02 0.43 1.0] 1.395]4 TRUE 0.]] 41].5] 426.20 OK -8.63 104 10+n.90 1 420.12 12 1 0.75 1 25.331 0.0004 0.01 7.99 0.25 0.56 7.31 4.09 0.83 0.29 64.34 0.45 1.00 11.303971 TRUE 1 0.66 420.78 426.41 OK -5.63 106 11+59.82 422.24 1 12 1 0.56 1 $6.931 0.0002 1 0.02 7.31 0.21 0.13 4.75 0.63 0.35 0.12 51.85 0.18 1 0.51 0.65674 TRUE 1 0.35 1 422.59 437.50 OK -14.91 108 12+15.99 429.51 1 12 1 0.13 1 56.17 0.0000 1 0.00 4.75 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1 0.09 10.113831 FALSE 1 0.11 1429.62 43].3] OK -].]4 DEQ Virginia Runoff Reduction Method Re-Developm 02012 BMP Standards and Specifications 02013 Draft BMP Standards and Specifications Project Name: UVA Community Credit Union Date: 4/3/2023 Linear Development Project? No Site Information Post -Development Project (Treatment Volume and Loads) Enter Total Disturbed Area (acres) Pre-ReDevelopment land Cover (acres( data Input tells constant values calculation cells Linearproject? No Land cover areas entered correctly? ✓ Total disturbed area entered? v/ A soils BSoils Csoils DSoils Totals Forest/Open Space (acres) -- undismrbetl space 0.00forest/open Managed Turflacresl -- disturber, graded for yards or other Tustin be mawetl/managetl 0.75 0.75 Impervious Cover (acres) 091 0.91 1.66 Post -Development land Cover (acres( A Soils BSoils Csoils DSoils Totals Forest/Open Space (acres)--undisturbar, forest/coven space or reforested land 0.00mtected Managed Turf )acres) - disturbed, graded for yards or other turf to be mawetl/man ad 0.66 0.66 Impervious Cover (acres) 1.00 1'00 Area Check OK. OK. OK. OK. 1.66 Pre-ReDevelopment Listed Adjusted' Forest/Open Space Cancer (acres) 0.00 0.00 Weighted Ry(fore4) 0.00 0.00 %Forest Managed Turf Cover (acres) 0.75 0.66 Weighted Rv(turf) 0.20 0.20 %Managed Turf 45% 42% Impervious Cover (acres) 0.91 0.91 Rv(impervious) 0.95 0.95 %lmpervinus 55% 58% Total She Area (acres) 1.66 1.57 she Rv 0.61 0.63 Treatment Volume and Nutrient Load Pre-ReDevelopment Treatment Volume (acre -fit) 0.0845 0.0830 Pre-ReDevelopment Treatment Volume (cubicfeet) 3,683 3,617 Pre-ReDevelopment TP Load (Ib/yr) 2.31 2.27 PmReOevelopmmn TP Load per acre (lb/acre/yr) 1.39 1A5 Baseline TP Load (Ib/yr) p0A1lbs/ave/yr applied to pre- redevelopment area ertlutling pervious land imposed for new impervious cmreQ 0.64 'Adjusted Land Cover Summery: ore ReDevelopment tend cover minus pervious lend cover (forest/open spare or m raged turf) acreage proposed? r new impervious cover. adjusted total acreage is consistent with Post-ReDevelopment erreoge (minus acreage fnew imperil.. cover). ^obmn I shows bad reduction requnementf rnew impervious cover )beset on new levetopment load limit 0.41 Ihs/ocre/year). 0.95 Post ReDev. & New Impervious Fmest/Open Space 0.00 Cover Weighted Ranorest) 0.00 %Forest 0% Managed Turf Corer 0.66 (acres) Weighted Rv(turf) 0.20 %Managetl Turf 441h Impervious Cover 100 Rai(impervious) 0.95 %lmpervinus 60% Final Site Area (acres) 1.66 Final Post Den site Rv 0.65 Final PaM- Development 0.0902 Treatment Volume (acre-ft) Final Past - Development 3,928 Treatment Volume (cubicfeet) Final Post- )evelopmentTIP Load 2.47 (lb/yr) 'inal Pro -rkvelopment TP Load per arm 1.49 (Ib/ave/yr) D xli 0.05 0.25 0.95 Post-ReDevebpmeM Forest/Open Space Cover (acres) OAO Weighted Rv(forest) 0.00 %Forest 0% Managed Turf Cover (acres) O66 Weighted Rv (turf) 0.20 %Managed Turf 42% ReDev. Impervious Cover (acres) 0.91 0.v(impervious) 0.95 %Impervious 59% Total ReDev. She Area (acres) 157 ReDev She go 0.63 Treatment Volume and Nutrient Load i d Reduction Required (Ib/yr) 0.61 Nitrogen Loads (Informational Purposes Only) Past-ReDevelopment TreatmentVaume 0.0930 (ecre-R) Post-ReDevelopment TreatmentVolume 3,617 (Cu ak feet) Port-ReDevebpmeM Load (TP) 2.27 (lb/yr)a Post-ReDevelopment TP Load per acre (lb/acre/yr) Maz. Reduction Require! (Below Pre- TO% Reainelopment Load) TP Load Reduction Required for Redeveloped Area 0.45 (Ib/Yrl Final Post -Development TN load Pre-ReDevelopment TN Load(lb/yr) 16.55 (Past-ReDevelopment&New 17.65 Impervious) (b/yr) Land Cover Summary -Post Past -Development New Impervious New Imprvious Cover 0Do (acres Rv(impervious) 0.95 past -Development Treatment Volume 0.0071 (.con_, acre ft past-Development Trertmeat Volume (cubic 310 feet) Post-DevelopmentID Wad (lb/yr) TP lAad Reduction Required for New 0.16 .pervious Area (lb/vr) 18S 21 S PRE-DEVEO D ?ROUTED EVELOPED ROUTED DISTU ED TURBED 36S 37S PRE- DEVELOPED 35L O ROUTED PRE -DEVELOPED UNDISTURBED UNROUTED PRE AP 1 UNDISTURBED 41S DISTURBED SHEET FLOW 3 Subcat Reach on Link Routing Diagram for UVA CCU Prelim Storm Prepared by Timmons Group, Printed 4/3/2023 FyclroGADO 10.10-7a s/n 08663 © 2021 HydroCAD Software Solutions LLC UVA CCU Prelim Storm Prepared by Timmons Grot Rainfall Events Listing (selected events) Event# Event Storm Type Curve Mode Duration B/B Depth AMC Name (hours) (inches) 1 1-year Type II 24-hr Default 24.00 1 3.07 2 2 10-year Type II 24-hr Default 24.00 1 5.58 2 Printed 4/3/2023 UVA CCU Prelim Storm Prepared by Timmons Gro( Type/1 24-hr 1-year Rainfall=3.07" Printed 4/3/2023 Summary for Subcatchment 18S: PRE-DEVEOPED ROUTED DISTURBED Runoff = 2.02 cfs @ 11.97 hrs, Volume= 0.090 af, Depth> 1.38" Routed to Link 35L : PRE AP 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1-year Rainfall=3.07" Area (ac) CN Description 0.460 98 0.320 61 >75% Grass cover, Good, HSG B 0.780 83 Weighted Average 0.320 41.03% Pervious Area 0.460 58.97% Impervious Area Tc Length Capacity Description Direct Entry, Subcatchment 18S: PRE-DEVEOPED ROUTED DISTURBED Hydrograph ❑ Runoff u 3 LL 1 Type II 24-hr 1-year Rainfall=3.07" Runoff Area=0.780 ac Runoff Volume=0.090 of Runoff Depth>1.38" Tc=6.0 min CN=83 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) UVA CCU Prelim Storm Prepared by Timmons Grot Type/1 24-hr 1-year Rainfall=3.07" Printed 4/3/2023 Hydrograph for Subcatchment 18S: PRE-DEVEOPED ROUTED DISTURBED Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.19 0.00 0.00 5.25 0.21 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.25 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.29 0.00 0.00 7.00 0.30 0.00 0.00 7.25 0.32 0.00 0.00 7.50 0.34 0.00 0.00 7.75 0.35 0.00 0.00 8.00 0.37 0.00 0.00 8.25 0.39 0.00 0.00 8.50 0.41 0.00 0.00 8.75 0.43 0.00 0.00 9.00 0.45 0.00 0.00 9.25 0.48 0.00 0.00 9.50 0.50 0.00 0.01 9.75 0.53 0.01 0.01 10.00 0.56 0.01 0.01 10.25 0.59 0.01 0.02 10.50 0.63 0.02 0.02 10.75 0.67 0.03 0.03 11.00 0.72 0.04 0.04 11.25 0.79 0.06 0.06 11.50 0.87 0.08 0.08 11.75 1.19 0.21 0.49 12.00 2.04 0.72 1.94 12.25 2.17 0.81 0.29 12.50 2.26 0.88 0.19 12.75 2.32 0.92 0.14 13.00 2.37 0.96 0.12 13.25 2.41 0.99 0.10 13.50 2.45 1.02 0.09 13.75 2.49 1.05 0.08 14.00 2.52 1.07 0.07 14.25 2.55 1.09 0.07 14.50 2.57 1.11 0.06 14.75 2.60 1.13 0.06 15.00 2.62 1.15 0.06 15.25 2.64 1.16 0.05 15.50 2.66 1.18 0.05 15.75 2.68 1.20 0.05 16.00 2.70 1.21 0.04 16.25 2.72 1.22 0.04 16.50 2.74 1.24 0.04 16.75 2.75 1.25 0.04 17.00 2.77 1.26 0.04 17.25 2.78 1.27 0.04 17.50 2.80 1.29 0.04 17.75 2.81 1.30 0.04 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 2.83 1.31 0.03 18.25 2.84 1.32 0.03 18.50 2.85 1.33 0.03 18.75 2.87 1.34 0.03 19.00 2.88 1.35 0.03 19.25 2.89 1.36 0.03 19.50 2.90 1.37 0.03 19.75 2.91 1.38 0.03 20.00 2.92 1.38 0.03 UVA CCU Prelim Storm Prepared by Timmons Gro( Type/1 24-hr 1-year Rainfall=3.07" Printed 4/3/2023 Summary for Subcatchment 21S: PRE -DEVELOPED UNROUTED DISTURBED Runoff = 1.33 cfs @ 11.98 hrs, Volume= 0.058 af, Depth> 0.86" Routed to Link 35L : PRE AP 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1-year Rainfall=3.07" Area (ac) CN Description 0.280 98 0.530 61 >75% Grass cover, Good, HSG B 0.810 74 Weighted Average 0.530 65.43% Pervious Area 0.280 34.57% Impervious Area Tc Length Capacity Description 6.0 Direct Entry, Subcatchment 21S: PRE -DEVELOPED UNROUTED DISTURBED Hydrograph I I I I i I I N I I I I I I I I I I I I I I I I I I I I I I I I I 0 I I I I LL I I I I I Type II 24-hr 1-year Rainfall=3.07" Runoff Area=0.810 ac Runoff Volume=0.058 of Runoff Depth>0.86" Tc=6.0 min CN=74 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Runoff UVA CCU Prelim Storm Prepared by Timmons Grot Type/1 24-hr 1-year Rainfall=3.07" Printed 4/3/2023 Hydrograph for Subcatchment 21S: PRE -DEVELOPED UNROUTED DISTURBED Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.19 0.00 0.00 5.25 0.21 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.25 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.29 0.00 0.00 7.00 0.30 0.00 0.00 7.25 0.32 0.00 0.00 7.50 0.34 0.00 0.00 7.75 0.35 0.00 0.00 8.00 0.37 0.00 0.00 8.25 0.39 0.00 0.00 8.50 0.41 0.00 0.00 8.75 0.43 0.00 0.00 9.00 0.45 0.00 0.00 9.25 0.48 0.00 0.00 9.50 0.50 0.00 0.00 9.75 0.53 0.00 0.00 10.00 0.56 0.00 0.00 10.25 0.59 0.00 0.00 10.50 0.63 0.00 0.00 10.75 0.67 0.00 0.00 11.00 0.72 0.00 0.00 11.25 0.79 0.00 0.01 11.50 0.87 0.01 0.02 11.75 1.19 0.06 0.21 12.00 2.04 0.37 1.29 12.25 2.17 0.43 0.21 12.50 2.26 0.48 0.14 12.75 2.32 0.51 0.10 13.00 2.37 0.54 0.09 13.25 2.41 0.56 0.08 13.50 2.45 0.58 0.07 13.75 2.49 0.60 0.06 14.00 2.52 0.62 0.05 14.25 2.55 0.63 0.05 14.50 2.57 0.65 0.05 14.75 2.60 0.66 0.05 15.00 2.62 0.68 0.04 15.25 2.64 0.69 0.04 15.50 2.66 0.70 0.04 15.75 2.68 0.71 0.04 16.00 2.70 0.72 0.04 16.25 2.72 0.74 0.03 16.50 2.74 0.75 0.03 16.75 2.75 0.76 0.03 17.00 2.77 0.76 0.03 17.25 2.78 0.77 0.03 17.50 2.80 0.78 0.03 17.75 2.81 0.79 0.03 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 2.83 0.80 0.03 18.25 2.84 0.81 0.03 18.50 2.85 0.82 0.03 18.75 2.87 0.82 0.03 19.00 2.88 0.83 0.02 19.25 2.89 0.84 0.02 19.50 2.90 0.85 0.02 19.75 2.91 0.85 0.02 20.00 2.92 0.86 0.02 UVA CCU Prelim Storm Prepared by Timmons Gro( Type/1 24-hr 1-year Rainfall=3.07" Printed 4/3/2023 Summary for Subcatchment 36S: PRE- DEVELOPED ROUTED UNDISTURBED Runoff = 1.47 cfs @ 11.97 hrs, Volume= 0.067 af, Depth> 1.75" Routed to Link 35L : PRE AP 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1-year Rainfall=3.07" Area (ac) CN Description 0.330 98 0.130 61 >75% Grass cover, Good, HSG B 0.460 88 Weighted Average 0.130 28.26% Pervious Area 0.330 71.74% Impervious Area Tc Length 1 Capacity Description Direct Entry, Subcatchment 36S: PRE- DEVELOPED ROUTED UNDISTURBED Hydrograph I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I Type II 24-hr 1-year Rainfall=3.07" Runoff Area=0.460 ac Runoff Volume=0.067 of Runoff Depth>1.75" Tc=6.0 min 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Runoff UVA CCU Prelim Storm Prepared by Timmons Grot Type/1 24-hr 1-year Rainfall=3.07" Printed 4/3/2023 Hydrograph for Subcatchment 36S: PRE- DEVELOPED ROUTED UNDISTURBED Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.19 0.00 0.00 5.25 0.21 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.25 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.29 0.00 0.00 7.00 0.30 0.00 0.00 7.25 0.32 0.00 0.00 7.50 0.34 0.00 0.00 7.75 0.35 0.00 0.00 8.00 0.37 0.01 0.00 8.25 0.39 0.01 0.00 8.50 0.41 0.01 0.01 8.75 0.43 0.02 0.01 9.00 0.45 0.02 0.01 9.25 0.48 0.03 0.01 9.50 0.50 0.03 0.01 9.75 0.53 0.04 0.01 10.00 0.56 0.05 0.02 10.25 0.59 0.06 0.02 10.50 0.63 0.07 0.03 10.75 0.67 0.09 0.03 11.00 0.72 0.11 0.04 11.25 0.79 0.14 0.06 11.50 0.87 0.18 0.08 11.75 1.19 0.37 0.41 12.00 2.04 0.99 1.39 12.25 2.17 1.10 0.20 12.50 2.26 1.18 0.13 12.75 2.32 1.23 0.09 13.00 2.37 1.27 0.08 13.25 2.41 1.31 0.07 13.50 2.45 1.34 0.06 13.75 2.49 1.37 0.05 14.00 2.52 1.40 0.05 14.25 2.55 1.42 0.04 14.50 2.57 1.44 0.04 14.75 2.60 1.46 0.04 15.00 2.62 1.48 0.04 15.25 2.64 1.50 0.04 15.50 2.66 1.52 0.03 15.75 2.68 1.54 0.03 16.00 2.70 1.56 0.03 16.25 2.72 1.57 0.03 16.50 2.74 1.59 0.03 16.75 2.75 1.60 0.03 17.00 2.77 1.61 0.03 17.25 2.78 1.63 0.03 17.50 2.80 1.64 0.02 17.75 2.81 1.65 0.02 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 2.83 1.67 0.02 18.25 2.84 1.68 0.02 18.50 2.85 1.69 0.02 18.75 2.87 1.70 0.02 19.00 2.88 1.71 0.02 19.25 2.89 1.72 0.02 19.50 2.90 1.73 0.02 19.75 2.91 1.74 0.02 20.00 2.92 1.75 0.02 UVA CCU Prelim Storm Prepared by Timmons Gro( Type/1 24-hr 1-year Rainfall=3.07" Printed 4/3/2023 Summary for Subcatchment 37S: PRE -DEVELOPED UNROUTED UNDISTURBED Runoff = 7.15 cfs @ 11.97 hrs, Volume= 0.329 af, Depth> 1.83" Routed to Link 35L : PRE AP 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1-year Rainfall=3.07" Area (ac) CN Description 1.650 98 0.510 61 >75% Grass cover, Good, HSG B 2.160 89 Weighted Average 0.510 23.61 % Pervious Area 1.650 76.39% Impervious Area Tc Length Capacity Description Direct Entry, Subcatchment 37S: PRE -DEVELOPED UNROUTED UNDISTURBED Hydrograph ❑ Runoff 2 Type II 24-hr 1-year Rainfall=3.07" Runoff Area=2.160 ac Runoff Volume=0.329 of Runoff Depth>1.83" Tc=6.0 min CN=89 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) UVA CCU Prelim Storm Prepared by Timmons Grot Type/1 24-hr 1-year Rainfall=3.07" Printed 4/3/2023 Hydrograph for Subcatchment 37S: PRE -DEVELOPED UNROUTED UNDISTURBED Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.19 0.00 0.00 5.25 0.21 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.25 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.29 0.00 0.01 7.00 0.30 0.00 0.01 7.25 0.32 0.00 0.01 7.50 0.34 0.01 0.02 7.75 0.35 0.01 0.02 8.00 0.37 0.01 0.02 8.25 0.39 0.01 0.03 8.50 0.41 0.02 0.04 8.75 0.43 0.02 0.04 9.00 0.45 0.03 0.05 9.25 0.48 0.04 0.06 9.50 0.50 0.04 0.06 9.75 0.53 0.05 0.08 10.00 0.56 0.06 0.09 10.25 0.59 0.07 0.11 10.50 0.63 0.09 0.13 10.75 0.67 0.11 0.17 11.00 0.72 0.13 0.21 11.25 0.79 0.16 0.29 11.50 0.87 0.21 0.40 11.75 1.19 0.41 2.07 12.00 2.04 1.06 6.75 12.25 2.17 1.17 0.95 12.50 2.26 1.24 0.62 12.75 2.32 1.30 0.45 13.00 2.37 1.34 0.38 13.25 2.41 1.38 0.33 13.50 2.45 1.41 0.29 13.75 2.49 1.44 0.26 14.00 2.52 1.47 0.23 14.25 2.55 1.49 0.21 14.50 2.57 1.52 0.20 14.75 2.60 1.54 0.19 15.00 2.62 1.56 0.18 15.25 2.64 1.58 0.17 15.50 2.66 1.60 0.16 15.75 2.68 1.62 0.15 16.00 2.70 1.63 0.14 16.25 2.72 1.65 0.13 16.50 2.74 1.66 0.13 16.75 2.75 1.68 0.13 17.00 2.77 1.69 0.12 17.25 2.78 1.71 0.12 17.50 2.80 1.72 0.12 17.75 2.81 1.73 0.11 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 2.83 1.74 0.11 18.25 2.84 1.76 0.11 18.50 2.85 1.77 0.10 18.75 2.87 1.78 0.10 19.00 2.88 1.79 0.09 19.25 2.89 1.80 0.09 19.50 2.90 1.81 0.09 19.75 2.91 1.82 0.08 20.00 2.92 1.83 0.08 UVA CCU Prelim Storm Prepared by Timmons Gro( Type/1 24-hr 1-year Rainfall=3.07" Printed 4/3/2023 Summary for Subcatchment 41S: DISTURBED SHEET FLOW 3 Runoff = 0.02 cfs @ 12.00 hrs, Volume= 0.001 af, Depth> 0.34" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1-year Rainfall=3.07" Area (ac) CN Description 0.000 98 0.030 61 >75% Grass cover, Good, HSG B 0.030 61 Weighted Average 0.030 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 41S: DISTURBED SHEET FLOW 3 Hydrograph 0017 ---- 0016 ____ .___ J____I----L----I-- not 0.015 ___ -____I____ ----____T ----I__ I ------------- I I I I I 0013 I I I I I I 0012 I 0.011 I I I I I 0.01 I I I N r ---- - - -T 0 0.008 Q 007 I _ 0.006 0.005 0.004 0.003 0.002 -------1----'-- ----I----r----- ❑Runoff --- ---- Type II 24-hr ---=----- --- -- 1-year Rainfall=3.07" Runoff Area'=0.030 ec -- -Runoff Volume=0.001 'laf Runof#Depth>' G.34" ------r------------ ----------------T4b-6A-njj - I I I 1 I I N=, 1- - I I 1 1 I I I I I I I I I I I 10 11 12 13 Time (hours) UVA CCU Prelim Storm Prepared by Timmons Grot Type/1 24-hr 1-year Rainfall=3.07" Printed 4/3/2023 Hydrograph for Subcatchment 41S: DISTURBED SHEET FLOW 3 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.19 0.00 0.00 5.25 0.21 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.25 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.29 0.00 0.00 7.00 0.30 0.00 0.00 7.25 0.32 0.00 0.00 7.50 0.34 0.00 0.00 7.75 0.35 0.00 0.00 8.00 0.37 0.00 0.00 8.25 0.39 0.00 0.00 8.50 0.41 0.00 0.00 8.75 0.43 0.00 0.00 9.00 0.45 0.00 0.00 9.25 0.48 0.00 0.00 9.50 0.50 0.00 0.00 9.75 0.53 0.00 0.00 10.00 0.56 0.00 0.00 10.25 0.59 0.00 0.00 10.50 0.63 0.00 0.00 10.75 0.67 0.00 0.00 11.00 0.72 0.00 0.00 11.25 0.79 0.00 0.00 11.50 0.87 0.00 0.00 11.75 1.19 0.00 0.00 12.00 2.04 0.08 0.02 12.25 2.17 0.11 0.00 12.50 2.26 0.13 0.00 12.75 2.32 0.15 0.00 13.00 2.37 0.16 0.00 13.25 2.41 0.17 0.00 13.50 2.45 0.18 0.00 13.75 2.49 0.19 0.00 14.00 2.52 0.20 0.00 14.25 2.55 0.21 0.00 14.50 2.57 0.22 0.00 14.75 2.60 0.23 0.00 15.00 2.62 0.23 0.00 15.25 2.64 0.24 0.00 15.50 2.66 0.25 0.00 15.75 2.68 0.25 0.00 16.00 2.70 0.26 0.00 16.25 2.72 0.26 0.00 16.50 2.74 0.27 0.00 16.75 2.75 0.28 0.00 17.00 2.77 0.28 0.00 17.25 2.78 0.29 0.00 17.50 2.80 0.29 0.00 17.75 2.81 0.30 0.00 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 2.83 0.30 0.00 18.25 2.84 0.31 0.00 18.50 2.85 0.31 0.00 18.75 2.87 0.32 0.00 19.00 2.88 0.32 0.00 19.25 2.89 0.32 0.00 19.50 2.90 0.33 0.00 19.75 2.91 0.33 0.00 20.00 2.92 0.34 0.00 UVA CCU Prelim Storm Prepared by Timmons Gro( Type/1 24-hr 1-year Rainfall=3.07" Printed 4/3/2023 Summary for Link 35L: PRE AP 1 Inflow Area = 4.210 ac, 64.61 % Impervious, Inflow Depth > 1.55" for 1-year event Inflow = 11.93 cfs @ 11.97 hrs, Volume= 0.544 of Primary = 11.93 cfs @ 11.97 hrs, Volume= 0.544 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs 13 12 11 10 9 8 Y 7 3 0 0 LL 5 4 3 2 1 0 Link 35L: PRE AP 1 Hydrograph Time (hours) ❑ Inflow ❑ Primary UVA CCU Prelim Storm Prepared by Timmons Grot Type/1 24-hr 1-year Rainfall=3.07" Hydrograph for Link 35L: PRE AP 1 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 5.00 0.00 0.00 0.00 5.25 0.00 0.00 0.00 5.50 0.00 0.00 0.00 5.75 0.00 0.00 0.00 6.00 0.00 0.00 0.00 6.25 0.00 0.00 0.00 6.50 0.00 0.00 0.00 6.75 0.01 0.00 0.01 7.00 0.01 0.00 0.01 7.25 0.02 0.00 0.02 7.50 0.02 0.00 0.02 7.75 0.02 0.00 0.02 8.00 0.03 0.00 0.03 8.25 0.03 0.00 0.03 8.50 0.04 0.00 0.04 8.75 0.05 0.00 0.05 9.00 0.06 0.00 0.06 9.25 0.07 0.00 0.07 9.50 0.08 0.00 0.08 9.75 0.10 0.00 0.10 10.00 0.12 0.00 0.12 10.25 0.15 0.00 0.15 10.50 0.18 0.00 0.18 10.75 0.23 0.00 0.23 11.00 0.29 0.00 0.29 11.25 0.41 0.00 0.41 11.50 0.59 0.00 0.59 11.75 3.18 0.00 3.18 12.00 11.37 0.00 11.37 12.25 1.64 0.00 1.64 12.50 1.07 0.00 1.07 12.75 0.79 0.00 0.79 13.00 0.66 0.00 0.66 13.25 0.58 0.00 0.58 13.50 0.51 0.00 0.51 13.75 0.45 0.00 0.45 14.00 0.40 0.00 0.40 14.25 0.37 0.00 0.37 14.50 0.35 0.00 0.35 14.75 0.34 0.00 0.34 15.00 0.32 0.00 0.32 15.25 0.30 0.00 0.30 15.50 0.28 0.00 0.28 15.75 0.27 0.00 0.27 16.00 0.25 0.00 0.25 16.25 0.24 0.00 0.24 16.50 0.23 0.00 0.23 16.75 0.23 0.00 0.23 17.00 0.22 0.00 0.22 17.25 0.21 0.00 0.21 17.50 0.21 0.00 0.21 17.75 0.20 0.00 0.20 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 18.00 0.19 0.00 0.19 18.25 0.19 0.00 0.19 18.50 0.18 0.00 0.18 18.75 0.18 0.00 0.18 19.00 0.17 0.00 0.17 19.25 0.16 0.00 0.16 19.50 0.16 0.00 0.16 19.75 0.15 0.00 0.15 20.00 0.14 0.00 0.14 Printed 4/3/2023 UVA CCU Prelim Storm Prepared by Timmons Gro( Type II 24-hr 10-year Rainfall=5.58" Printed 4/3/2023 Summary for Subcatchment 18S: PRE-DEVEOPED ROUTED DISTURBED Runoff = 4.84 cfs @ 11.97 hrs, Volume= 0.224 af, Depth> 3.45" Routed to Link 35L : PRE AP 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10-year Rainfall=5.58" Area (ac) CN Description 0.460 98 0.320 61 >75% Grass cover, Good, HSG B 0.780 83 Weighted Average 0.320 41.03% Pervious Area 0.460 58.97% Impervious Area Tc Length Capacity Description Direct Entry, Subcatchment 18S: PRE-DEVEOPED ROUTED DISTURBED Hydrograph ❑ Runoff 4 2 _____________________ 7_ Type II 24-hr 10-year Rainfall=5.58" Runoff Area=0.780 ac Runoff Volume=0.4224 af- Runoff Depth>3.45" Tc=6.0 min �'N=',83 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) UVA CCU Prelim Storm Prepared by Timmons Grot Type II 24-hr 10-year Rainfall=5.58" Printed 4/3/2023 Hydrograph for Subcatchment 18S: PRE-DEVEOPED ROUTED DISTURBED Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.35 0.00 0.00 5.25 0.37 0.00 0.00 5.50 0.40 0.00 0.00 5.75 0.42 0.00 0.00 6.00 0.45 0.00 0.00 6.25 0.47 0.00 0.00 6.50 0.50 0.00 0.01 6.75 0.52 0.01 0.01 7.00 0.55 0.01 0.01 7.25 0.58 0.01 0.01 7.50 0.61 0.02 0.01 7.75 0.64 0.02 0.02 8.00 0.67 0.03 0.02 8.25 0.70 0.04 0.02 8.50 0.74 0.05 0.03 8.75 0.78 0.06 0.03 9.00 0.82 0.07 0.04 9.25 0.86 0.08 0.05 9.50 0.91 0.10 0.05 9.75 0.96 0.12 0.06 10.00 1.01 0.14 0.07 10.25 1.07 0.16 0.08 10.50 1.14 0.19 0.10 10.75 1.22 0.23 0.12 11.00 1.31 0.28 0.15 11.25 1.43 0.34 0.21 11.50 1.58 0.43 0.28 11.75 2.16 0.81 1.43 12.00 3.70 2.03 4.56 12.25 3.94 2.23 0.64 12.50 4.10 2.37 0.41 12.75 4.21 2.47 0.30 13.00 4.31 2.56 0.25 13.25 4.39 2.63 0.22 13.50 4.46 2.69 0.19 13.75 4.52 2.74 0.17 14.00 4.58 2.79 0.15 14.25 4.63 2.84 0.14 14.50 4.67 2.88 0.13 14.75 4.72 2.92 0.13 15.00 4.76 2.96 0.12 15.25 4.80 3.00 0.11 15.50 4.84 3.03 0.11 15.75 4.88 3.06 0.10 16.00 4.91 3.09 0.09 16.25 4.94 3.12 0.09 16.50 4.97 3.15 0.09 16.75 5.00 3.18 0.08 17.00 5.03 3.20 0.08 17.25 5.06 3.23 0.08 17.50 5.09 3.25 0.08 17.75 5.11 3.28 0.08 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 5.14 3.30 0.07 18.25 5.16 3.32 0.07 18.50 5.19 3.34 0.07 18.75 5.21 3.37 0.07 19.00 5.23 3.39 0.06 19.25 5.25 3.40 0.06 19.50 5.27 3.42 0.06 19.75 5.29 3.44 0.06 20.00 5.31 3.46 0.05 UVA CCU Prelim Storm Prepared by Timmons Gro( Type II 24-hr 10-year Rainfall=5.58" Printed 4/3/2023 Summary for Subcatchment 21S: PRE -DEVELOPED UNROUTED DISTURBED Runoff = 3.95 cfs @ 11.97 hrs, Volume= 0.176 af, Depth> 2.61" Routed to Link 35L : PRE AP 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10-year Rainfall=5.58" Area (ac) CN Description 0.280 98 0.530 61 >75% Grass cover, Good, HSG B 0.810 74 Weighted Average 0.530 65.43% Pervious Area 0.280 34.57% Impervious Area Tc Length Capacity Description 6.0 Direct Entry, Subcatchment 21S: PRE -DEVELOPED UNROUTED DISTURBED ❑ Runoff Type II 24-hr 10-year Rainfall=5.58" Runoff Area=0.810 ac Runoff Volume=0.176 of Runoff Depth>2.61" Tc=6.0 min CN=74 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) UVA CCU Prelim Storm Prepared by Timmons Grot Type II 24-hr 10-year Rainfall=5.58" Printed 4/3/2023 Hydrograph for Subcatchment 21S: PRE -DEVELOPED UNROUTED DISTURBED Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.35 0.00 0.00 5.25 0.37 0.00 0.00 5.50 0.40 0.00 0.00 5.75 0.42 0.00 0.00 6.00 0.45 0.00 0.00 6.25 0.47 0.00 0.00 6.50 0.50 0.00 0.00 6.75 0.52 0.00 0.00 7.00 0.55 0.00 0.00 7.25 0.58 0.00 0.00 7.50 0.61 0.00 0.00 7.75 0.64 0.00 0.00 8.00 0.67 0.00 0.00 8.25 0.70 0.00 0.00 8.50 0.74 0.00 0.00 8.75 0.78 0.00 0.00 9.00 0.82 0.00 0.01 9.25 0.86 0.01 0.01 9.50 0.91 0.01 0.01 9.75 0.96 0.02 0.02 10.00 1.01 0.02 0.03 10.25 1.07 0.03 0.03 10.50 1.14 0.05 0.04 10.75 1.22 0.07 0.06 11.00 1.31 0.09 0.08 11.25 1.43 0.12 0.12 11.50 1.58 0.17 0.17 11.75 2.16 0.43 0.99 12.00 3.70 1.38 3.79 12.25 3.94 1.55 0.55 12.50 4.10 1.67 0.36 12.75 4.21 1.75 0.27 13.00 4.31 1.83 0.23 13.25 4.39 1.89 0.20 13.50 4.46 1.94 0.17 13.75 4.52 1.99 0.15 14.00 4.58 2.03 0.14 14.25 4.63 2.07 0.13 14.50 4.67 2.11 0.12 14.75 4.72 2.14 0.12 15.00 4.76 2.18 0.11 15.25 4.80 2.21 0.10 15.50 4.84 2.24 0.10 15.75 4.88 2.27 0.09 16.00 4.91 2.29 0.09 16.25 4.94 2.32 0.08 16.50 4.97 2.34 0.08 16.75 5.00 2.37 0.08 17.00 5.03 2.39 0.08 17.25 5.06 2.41 0.07 17.50 5.09 2.43 0.07 17.75 5.11 2.46 0.07 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 5.14 2.48 0.07 18.25 5.16 2.50 0.06 18.50 5.19 2.51 0.06 18.75 5.21 2.53 0.06 19.00 5.23 2.55 0.06 19.25 5.25 2.57 0.06 19.50 5.27 2.58 0.05 19.75 5.29 2.60 0.05 20.00 5.31 2.62 0.05 UVA CCU Prelim Storm Prepared by Timmons Gro( Type II 24-hr 10-year Rainfall=5.58" Printed 4/3/2023 Summary for Subcatchment 36S: PRE- DEVELOPED ROUTED UNDISTURBED Runoff = 3.16 cfs @ 11.96 hrs, Volume= 0.152 af, Depth> 3.96" Routed to Link 35L : PRE AP 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10-year Rainfall=5.58" Area (ac) CN Description 0.330 98 0.130 61 >75% Grass cover, Good, HSG B 0.460 88 Weighted Average 0.130 28.26% Pervious Area 0.330 71.74% Impervious Area Tc Length Capacity Description Direct Entry, Subcatchment 36S: PRE- DEVELOPED ROUTED UNDISTURBED Hydrograph ❑ Runoff Type II 24-hr 10-year Rainfall=5.58" Runoff Area=0.460 ac --- 'Runoff Volume=0.152 of Runoff Depth>3.96" Tc=6.0 min 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) UVA CCU Prelim Storm Prepared by Timmons Grot Type II 24-hr 10-year Rainfall=5.58" Printed 4/3/2023 Hydrograph for Subcatchment 36S: PRE- DEVELOPED ROUTED UNDISTURBED Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.35 0.00 0.00 5.25 0.37 0.01 0.01 5.50 0.40 0.01 0.01 5.75 0.42 0.01 0.01 6.00 0.45 0.02 0.01 6.25 0.47 0.03 0.01 6.50 0.50 0.03 0.01 6.75 0.52 0.04 0.01 7.00 0.55 0.05 0.02 7.25 0.58 0.06 0.02 7.50 0.61 0.07 0.02 7.75 0.64 0.08 0.02 8.00 0.67 0.09 0.02 8.25 0.70 0.10 0.03 8.50 0.74 0.12 0.03 8.75 0.78 0.14 0.03 9.00 0.82 0.16 0.04 9.25 0.86 0.18 0.04 9.50 0.91 0.20 0.04 9.75 0.96 0.23 0.05 10.00 1.01 0.26 0.06 10.25 1.07 0.29 0.07 10.50 1.14 0.34 0.08 10.75 1.22 0.39 0.10 11.00 1.31 0.45 0.12 11.25 1.43 0.53 0.16 11.50 1.58 0.64 0.21 11.75 2.16 1.10 1.01 12.00 3.70 2.45 2.95 12.25 3.94 2.67 0.40 12.50 4.10 2.82 0.26 12.75 4.21 2.93 0.19 13.00 4.31 3.02 0.16 13.25 4.39 3.09 0.14 13.50 4.46 3.16 0.12 13.75 4.52 3.22 0.11 14.00 4.58 3.27 0.09 14.25 4.63 3.31 0.09 14.50 4.67 3.36 0.08 14.75 4.72 3.40 0.08 15.00 4.76 3.44 0.08 15.25 4.80 3.48 0.07 15.50 4.84 3.52 0.07 15.75 4.88 3.55 0.06 16.00 4.91 3.58 0.06 16.25 4.94 3.61 0.06 16.50 4.97 3.64 0.05 16.75 5.00 3.67 0.05 17.00 5.03 3.70 0.05 17.25 5.06 3.73 0.05 17.50 5.09 3.75 0.05 17.75 5.11 3.78 0.05 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 5.14 3.80 0.04 18.25 5.16 3.82 0.04 18.50 5.19 3.85 0.04 18.75 5.21 3.87 0.04 19.00 5.23 3.89 0.04 19.25 5.25 3.91 0.04 19.50 5.27 3.93 0.04 19.75 5.29 3.95 0.03 20.00 5.31 3.97 0.03 UVA CCU Prelim Storm Prepared by Timmons Gro( Type II 24-hr 10-year Rainfall=5.58" Printed 4/3/2023 Summary for Subcatchment 37S: PRE -DEVELOPED UNROUTED UNDISTURBED Runoff = 15.10 cfs @ 11.96 hrs, Volume= 0.731 af, Depth> 4.06" Routed to Link 35L : PRE AP 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10-year Rainfall=5.58" Area (ac) CN Description 1.650 98 0.510 61 >75% Grass cover, Good, HSG B 2.160 89 Weighted Average 0.510 23.61 % Pervious Area 1.650 76.39% Impervious Area Tc Length Capacity Description 6.0 Direct Entry, Subcatchment 37S: PRE -DEVELOPED UNROUTED UNDISTURBED 16 __-----+_ 15 ---------.I ,4 13 12 I I I I 10 I N -y -- -I 9 3 8- ' ° ---I--------I -- - - LL 7- I I I I I 5 I I I I 4 7 1 7 3 1 ----------------- 5 6 Hydrograph I I I I I I _____I____r____I____T____7___r__. ❑Runoff I I I I --- Type 11 24yhr -- ------ --- 10"ar RalnfalCr5.58'�- +----f----I----+-___ -- ---- 'I---- Runbff-AreA=2160;ac- --'I-- ----I Ru�tofF''1Volumo=0--.731,af- --,------T-R' Depth�4.06_' - --J-- ------ -- r =1--- Tc=660_111M- I I -- I I I I I I I I -WOE I T____ 7___ 7____ 7 7____ I I I I I I I I 10 11 12 13 14 15 16 17 18 19 20 Time (hours) UVA CCU Prelim Storm Prepared by Timmons Grot Type II 24-hr 10-year Rainfall=5.58" Printed 4/3/2023 Hydrograph for Subcatchment 37S: PRE -DEVELOPED UNROUTED UNDISTURBED Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.35 0.01 0.03 5.25 0.37 0.01 0.03 5.50 0.40 0.02 0.04 5.75 0.42 0.02 0.05 6.00 0.45 0.03 0.05 6.25 0.47 0.03 0.06 6.50 0.50 0.04 0.07 6.75 0.52 0.05 0.08 7.00 0.55 0.06 0.08 7.25 0.58 0.07 0.09 7.50 0.61 0.08 0.10 7.75 0.64 0.09 0.11 8.00 0.67 0.11 0.12 8.25 0.70 0.12 0.13 8.50 0.74 0.14 0.15 8.75 0.78 0.16 0.17 9.00 0.82 0.18 0.20 9.25 0.86 0.21 0.21 9.50 0.91 0.23 0.22 9.75 0.96 0.26 0.25 10.00 1.01 0.29 0.29 10.25 1.07 0.33 0.34 10.50 1.14 0.37 0.40 10.75 1.22 0.43 0.48 11.00 1.31 0.49 0.58 11.25 1.43 0.58 0.77 11.50 1.58 0.69 1.02 11.75 2.16 1.16 4.88 12.00 3.70 2.54 14.08 12.25 3.94 2.77 1.92 12.50 4.10 2.92 1.24 12.75 4.21 3.02 0.90 13.00 4.31 3.11 0.76 13.25 4.39 3.19 0.65 13.50 4.46 3.26 0.57 13.75 4.52 3.31 0.51 14.00 4.58 3.37 0.45 14.25 4.63 3.41 0.42 14.50 4.67 3.46 0.40 14.75 4.72 3.50 0.38 15.00 4.76 3.54 0.36 15.25 4.80 3.58 0.34 15.50 4.84 3.62 0.32 15.75 4.88 3.65 0.29 16.00 4.91 3.69 0.27 16.25 4.94 3.72 0.26 16.50 4.97 3.75 0.26 16.75 5.00 3.77 0.25 17.00 5.03 3.80 0.24 17.25 5.06 3.83 0.23 17.50 5.09 3.86 0.23 17.75 5.11 3.88 0.22 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 5.14 3.91 0.21 18.25 5.16 3.93 0.21 18.50 5.19 3.95 0.20 18.75 5.21 3.97 0.19 19.00 5.23 4.00 0.18 19.25 5.25 4.02 0.18 19.50 5.27 4.03 0.17 19.75 5.29 4.05 0.16 20.00 5.31 4.07 0.15 UVA CCU Prelim Storm Prepared by Timmons Gro( Type II 24-hr 10-year Rainfall=5.58" Printed 4/3/2023 Summary for Subcatchment 41S: DISTURBED SHEET FLOW 3 Runoff = 0.09 cfs @ 11.98 hrs, Volume= 0.004 af, Depth> 1.56" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10-year Rainfall=5.58" Area (ac) CN Description 0.000 98 0.030 61 >75% Grass cover, Good, HSG B 0.030 61 Weighted Average 0.030 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 41S: DISTURBED SHEET FLOW 3 Hydrograph � ----- ❑Runoff 9.995 ----i----i 9.9s - - ---- Type II 24-hr 9.98 ----. ----------�---- -- - -�-------10-year RainfallT Runoff Area=0.030ac- ---- - 9.965 9.96 ___ _. ___-_. __ L --`--------�____i____�__ Rurioffl"IL Mg-0.�D4��at w 9.955 ___ _. __ ---i----�i - -- �� 1�is V ___ ----�i i----i RtmQ1TDe�t11�1.�6rr o.95 LLo.945 ___ _. ___._. -- ___a____11---- __�___a-------------�-_ ;---- Il-_ ____i____4____ - ___ i____t___ i____1--TAb-6r0-niin-- 994 ___ _. y __ ___'____�____'____�__ r --------r--------r---�--- 9.935 i �� 1 9.03 i 9.925 ---4- - i 9.92 ---4- 9.915 ---' --i 19 11 12 13 14 15 16 17 18 19 Time (hours) UVA CCU Prelim Storm Prepared by Timmons Grot Type II 24-hr 10-year Rainfall=5.58" Printed 4/3/2023 Hydrograph for Subcatchment 41S: DISTURBED SHEET FLOW 3 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.35 0.00 0.00 5.25 0.37 0.00 0.00 5.50 0.40 0.00 0.00 5.75 0.42 0.00 0.00 6.00 0.45 0.00 0.00 6.25 0.47 0.00 0.00 6.50 0.50 0.00 0.00 6.75 0.52 0.00 0.00 7.00 0.55 0.00 0.00 7.25 0.58 0.00 0.00 7.50 0.61 0.00 0.00 7.75 0.64 0.00 0.00 8.00 0.67 0.00 0.00 8.25 0.70 0.00 0.00 8.50 0.74 0.00 0.00 8.75 0.78 0.00 0.00 9.00 0.82 0.00 0.00 9.25 0.86 0.00 0.00 9.50 0.91 0.00 0.00 9.75 0.96 0.00 0.00 10.00 1.01 0.00 0.00 10.25 1.07 0.00 0.00 10.50 1.14 0.00 0.00 10.75 1.22 0.00 0.00 11.00 1.31 0.00 0.00 11.25 1.43 0.00 0.00 11.50 1.58 0.01 0.00 11.75 2.16 0.11 0.01 12.00 3.70 0.66 0.09 12.25 3.94 0.78 0.01 12.50 4.10 0.86 0.01 12.75 4.21 0.92 0.01 13.00 4.31 0.97 0.01 13.25 4.39 1.02 0.01 13.50 4.46 1.06 0.00 13.75 4.52 1.09 0.00 14.00 4.58 1.12 0.00 14.25 4.63 1.15 0.00 14.50 4.67 1.18 0.00 14.75 4.72 1.20 0.00 15.00 4.76 1.23 0.00 15.25 4.80 1.25 0.00 15.50 4.84 1.27 0.00 15.75 4.88 1.30 0.00 16.00 4.91 1.32 0.00 16.25 4.94 1.33 0.00 16.50 4.97 1.35 0.00 16.75 5.00 1.37 0.00 17.00 5.03 1.39 0.00 17.25 5.06 1.41 0.00 17.50 5.09 1.42 0.00 17.75 5.11 1.44 0.00 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 5.14 1.45 0.00 18.25 5.16 1.47 0.00 18.50 5.19 1.48 0.00 18.75 5.21 1.50 0.00 19.00 5.23 1.51 0.00 19.25 5.25 1.52 0.00 19.50 5.27 1.54 0.00 19.75 5.29 1.55 0.00 20.00 5.31 1.56 0.00 UVA CCU Prelim Storm Prepared by Timmons Gro( Type II 24-hr 10-year Rainfall=5.58" Printed 4/3/2023 Summary for Link 35L: PRE AP 1 Inflow Area = 4.210 ac, 64.61 % Impervious, Inflow Depth > 3.66" for 10-year event Inflow = 27.03 cfs @ 11.97 hrs, Volume= 1.283 of Primary = 27.03 cfs @ 11.97 hrs, Volume= 1.283 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 35L: PRE AP 1 Hydrograph FE ]—I n—fl.—. ❑ Primary Time (hours) UVA CCU Prelim Storm Prepared by Timmons Grot Type II 24-hr 10-year Rainfall=5.58" Hydrograph for Link 35L: PRE AP 1 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 5.00 0.03 0.00 0.03 5.25 0.04 0.00 0.04 5.50 0.05 0.00 0.05 5.75 0.05 0.00 0.05 6.00 0.07 0.00 0.07 6.25 0.08 0.00 0.08 6.50 0.09 0.00 0.09 6.75 0.10 0.00 0.10 7.00 0.11 0.00 0.11 7.25 0.12 0.00 0.12 7.50 0.13 0.00 0.13 7.75 0.15 0.00 0.15 8.00 0.16 0.00 0.16 8.25 0.18 0.00 0.18 8.50 0.21 0.00 0.21 8.75 0.25 0.00 0.25 9.00 0.29 0.00 0.29 9.25 0.31 0.00 0.31 9.50 0.33 0.00 0.33 9.75 0.37 0.00 0.37 10.00 0.43 0.00 0.43 10.25 0.52 0.00 0.52 10.50 0.62 0.00 0.62 10.75 0.76 0.00 0.76 11.00 0.93 0.00 0.93 11.25 1.25 0.00 1.25 11.50 1.69 0.00 1.69 11.75 8.31 0.00 8.31 12.00 25.38 0.00 25.38 12.25 3.51 0.00 3.51 12.50 2.27 0.00 2.27 12.75 1.67 0.00 1.67 13.00 1.40 0.00 1.40 13.25 1.20 0.00 1.20 13.50 1.06 0.00 1.06 13.75 0.94 0.00 0.94 14.00 0.83 0.00 0.83 14.25 0.77 0.00 0.77 14.50 0.73 0.00 0.73 14.75 0.70 0.00 0.70 15.00 0.66 0.00 0.66 15.25 0.62 0.00 0.62 15.50 0.59 0.00 0.59 15.75 0.55 0.00 0.55 16.00 0.51 0.00 0.51 16.25 0.49 0.00 0.49 16.50 0.48 0.00 0.48 16.75 0.46 0.00 0.46 17.00 0.45 0.00 0.45 17.25 0.44 0.00 0.44 17.50 0.42 0.00 0.42 17.75 0.41 0.00 0.41 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 18.00 0.40 0.00 0.40 18.25 0.38 0.00 0.38 18.50 0.37 0.00 0.37 18.75 0.36 0.00 0.36 19.00 0.34 0.00 0.34 19.25 0.33 0.00 0.33 19.50 0.32 0.00 0.32 19.75 0.30 0.00 0.30 20.00 0.29 0.00 0.29 Printed 4/3/2023 UVA CCU Prelim Storm Prepared by Timmons Grot TABLE OF CONTENTS Project Reports 1 Routing Diagram 2 Rainfall Events Listing (selected events) 1-year Event 3 Subcat 18S: PRE-DEVEOPED ROUTED DISTURBED 5 Subcat 21S: PRE -DEVELOPED UNROUTED DISTURBED 7 Subcat 36S: PRE- DEVELOPED ROUTED UNDISTURBED 9 Subcat 37S: PRE -DEVELOPED UNROUTED UNDISTURBED 11 Subcat 41S: DISTURBED SHEET FLOW 3 13 Link 35L: PRE AP 1 10-year Event 15 Subcat 18S: PRE-DEVEOPED ROUTED DISTURBED 17 Subcat 21S: PRE -DEVELOPED UNROUTED DISTURBED 19 Subcat 36S: PRE- DEVELOPED ROUTED UNDISTURBED 21 Subcat 37S: PRE -DEVELOPED UNROUTED UNDISTURBED 23 Subcat 41S: DISTURBED SHEET FLOW 3 25 Link 35L: PRE AP 1 Table of Contents Printed 4/3/2023 23S 24S POST DEVELOPED POST DEVELOPE ROUTED DISTURBED ROUTED UNDISTURBED 27S O UGD PO DEVELOPED 25S UNROUTED DISTURBED POST DEVELOPED UNROUTED 42S UNDISTURBED li 3L DISTURBED SHEET POST AP 1 FLOW 3 Subcat Reach 4on Llnk UVA CCU Prelim Storm Prepared by Timmons Grot Rainfall Events Listing (selected events) Event# Event Storm Type Curve Mode Duration B/B Depth AMC Name (hours) (inches) 1 1-year Type II 24-hr Default 24.00 1 3.07 2 2 10-year Type II 24-hr Default 24.00 1 5.58 2 Printed 4/3/2023 UVA CCU Prelim Storm Prepared by Timmons Gro( Type/1 24-hr 1-year Rainfall=3.07" Printed 4/3/2023 Summary for Subcatchment 23S: POST DEVELOPED ROUTED DISTURBED Runoff = 2.74 cfs @ 11.97 hrs, Volume= 0.127 af, Depth> 1.91" Routed to Pond 25P : UGD Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1-year Rainfall=3.07" Area (ac) CN Description 0.620 98 0.180 61 >75% Grass cover, Good, HSG B 0.800 90 Weighted Average 0.180 22.50% Pervious Area 0.620 77.50% Impervious Area Tc Length Capacity Description 6.0 Direct Entry, Subcatchment 23S: POST DEVELOPED ROUTED DISTURBED Hydrograph 3 2.9a 4T6 I I I I I I I I I I I I I Type II 24-hr I I I I I I 1-year Rainfall=3.07" I I I I I I I Runoff Area=0.800 ac 2 IRunoff Volume=0.127 of I I I I I Runoff Depth>1.91" 3 I I I I I LL I I I Tc=6.0 min CN=90 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Runoff UVA CCU Prelim Storm Prepared by Timmons Grot Type/1 24-hr 1-year Rainfall=3.07" Printed 4/3/2023 Hydrograph for Subcatchment 23S: POST DEVELOPED ROUTED DISTURBED Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.19 0.00 0.00 5.25 0.21 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.25 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.29 0.00 0.00 7.00 0.30 0.01 0.01 7.25 0.32 0.01 0.01 7.50 0.34 0.01 0.01 7.75 0.35 0.01 0.01 8.00 0.37 0.02 0.01 8.25 0.39 0.02 0.01 8.50 0.41 0.03 0.02 8.75 0.43 0.03 0.02 9.00 0.45 0.04 0.02 9.25 0.48 0.05 0.03 9.50 0.50 0.06 0.03 9.75 0.53 0.07 0.03 10.00 0.56 0.08 0.04 10.25 0.59 0.09 0.05 10.50 0.63 0.11 0.06 10.75 0.67 0.13 0.07 11.00 0.72 0.15 0.09 11.25 0.79 0.19 0.12 11.50 0.87 0.24 0.16 11.75 1.19 0.45 0.81 12.00 2.04 1.12 2.59 12.25 2.17 1.24 0.36 12.50 2.26 1.32 0.23 12.75 2.32 1.37 0.17 13.00 2.37 1.42 0.14 13.25 2.41 1.45 0.12 13.50 2.45 1.49 0.11 13.75 2.49 1.52 0.10 14.00 2.52 1.55 0.09 14.25 2.55 1.57 0.08 14.50 2.57 1.59 0.08 14.75 2.60 1.62 0.07 15.00 2.62 1.64 0.07 15.25 2.64 1.66 0.06 15.50 2.66 1.68 0.06 15.75 2.68 1.70 0.06 16.00 2.70 1.71 0.05 16.25 2.72 1.73 0.05 16.50 2.74 1.74 0.05 16.75 2.75 1.76 0.05 17.00 2.77 1.77 0.05 17.25 2.78 1.79 0.05 17.50 2.80 1.80 0.04 17.75 2.81 1.81 0.04 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 2.83 1.83 0.04 18.25 2.84 1.84 0.04 18.50 2.85 1.85 0.04 18.75 2.87 1.86 0.04 19.00 2.88 1.87 0.04 19.25 2.89 1.88 0.03 19.50 2.90 1.89 0.03 19.75 2.91 1.90 0.03 20.00 2.92 1.91 0.03 UVA CCU Prelim Storm Prepared by Timmons Gro( Type/1 24-hr 1-year Rainfall=3.07" Printed 4/3/2023 Summary for Subcatchment 24S: POST DEVELOPED ROUTED UNDISTURBED Runoff = 1.47 cfs @ 11.97 hrs, Volume= 0.067 af, Depth> 1.75" Routed to Pond 25P : UGD Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1-year Rainfall=3.07" Area (ac) CN Description 0.330 98 0.130 61 >75% Grass cover, Good, HSG B 0.460 88 Weighted Average 0.130 28.26% Pervious Area 0.330 71.74% Impervious Area Tc Length 1 Capacity Description Direct Entry, Subcatchment 24S: POST DEVELOPED ROUTED UNDISTURBED Hydrograph Type II 24-hr 1-year Rainfall=3.07" Runoff Area=0.460 ac Runoff Volume=0.067 of Runoff Depth>1.75" Tc=6.0 min 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Runoff UVA CCU Prelim Storm Prepared by Timmons Grot Type/1 24-hr 1-year Rainfall=3.07" Printed 4/3/2023 Hydrograph for Subcatchment 24S: POST DEVELOPED ROUTED UNDISTURBED Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.19 0.00 0.00 5.25 0.21 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.25 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.29 0.00 0.00 7.00 0.30 0.00 0.00 7.25 0.32 0.00 0.00 7.50 0.34 0.00 0.00 7.75 0.35 0.00 0.00 8.00 0.37 0.01 0.00 8.25 0.39 0.01 0.00 8.50 0.41 0.01 0.01 8.75 0.43 0.02 0.01 9.00 0.45 0.02 0.01 9.25 0.48 0.03 0.01 9.50 0.50 0.03 0.01 9.75 0.53 0.04 0.01 10.00 0.56 0.05 0.02 10.25 0.59 0.06 0.02 10.50 0.63 0.07 0.03 10.75 0.67 0.09 0.03 11.00 0.72 0.11 0.04 11.25 0.79 0.14 0.06 11.50 0.87 0.18 0.08 11.75 1.19 0.37 0.41 12.00 2.04 0.99 1.39 12.25 2.17 1.10 0.20 12.50 2.26 1.18 0.13 12.75 2.32 1.23 0.09 13.00 2.37 1.27 0.08 13.25 2.41 1.31 0.07 13.50 2.45 1.34 0.06 13.75 2.49 1.37 0.05 14.00 2.52 1.40 0.05 14.25 2.55 1.42 0.04 14.50 2.57 1.44 0.04 14.75 2.60 1.46 0.04 15.00 2.62 1.48 0.04 15.25 2.64 1.50 0.04 15.50 2.66 1.52 0.03 15.75 2.68 1.54 0.03 16.00 2.70 1.56 0.03 16.25 2.72 1.57 0.03 16.50 2.74 1.59 0.03 16.75 2.75 1.60 0.03 17.00 2.77 1.61 0.03 17.25 2.78 1.63 0.03 17.50 2.80 1.64 0.02 17.75 2.81 1.65 0.02 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 2.83 1.67 0.02 18.25 2.84 1.68 0.02 18.50 2.85 1.69 0.02 18.75 2.87 1.70 0.02 19.00 2.88 1.71 0.02 19.25 2.89 1.72 0.02 19.50 2.90 1.73 0.02 19.75 2.91 1.74 0.02 20.00 2.92 1.75 0.02 UVA CCU Prelim Storm Prepared by Timmons Gro( Type/1 24-hr 1-year Rainfall=3.07" Printed 4/3/2023 Summary for Subcatchment 25S: POST DEVELOPED UNROUTED UNDISTURBED Runoff = 7.15 cfs @ 11.97 hrs, Volume= 0.329 af, Depth> 1.83" Routed to Link 23L : POST AP 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1-year Rainfall=3.07" Area (ac) CN Description 1.650 98 0.510 61 >75% Grass cover, Good, HSG B 2.160 89 Weighted Average 0.510 23.61 % Pervious Area 1.650 76.39% Impervious Area Tc Length Capacity Description 6.0 Direct Entry, Subcatchment 25S: POST DEVELOPED UNROUTED UNDISTURBED Hydrograph ❑ Runoff 2 Type II 24-hr 1-year Rainfall=3.07" Runoff Area=2.160 ac Runoff Volume=0.329 of Runoff Depth>1.83" Tc=6.0 min CN=89 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) UVA CCU Prelim Storm Prepared by Timmons Grot Type/1 24-hr 1-year Rainfall=3.07" Printed 4/3/2023 Hydrograph for Subcatchment 25S: POST DEVELOPED UNROUTED UNDISTURBED Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.19 0.00 0.00 5.25 0.21 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.25 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.29 0.00 0.01 7.00 0.30 0.00 0.01 7.25 0.32 0.00 0.01 7.50 0.34 0.01 0.02 7.75 0.35 0.01 0.02 8.00 0.37 0.01 0.02 8.25 0.39 0.01 0.03 8.50 0.41 0.02 0.04 8.75 0.43 0.02 0.04 9.00 0.45 0.03 0.05 9.25 0.48 0.04 0.06 9.50 0.50 0.04 0.06 9.75 0.53 0.05 0.08 10.00 0.56 0.06 0.09 10.25 0.59 0.07 0.11 10.50 0.63 0.09 0.13 10.75 0.67 0.11 0.17 11.00 0.72 0.13 0.21 11.25 0.79 0.16 0.29 11.50 0.87 0.21 0.40 11.75 1.19 0.41 2.07 12.00 2.04 1.06 6.75 12.25 2.17 1.17 0.95 12.50 2.26 1.24 0.62 12.75 2.32 1.30 0.45 13.00 2.37 1.34 0.38 13.25 2.41 1.38 0.33 13.50 2.45 1.41 0.29 13.75 2.49 1.44 0.26 14.00 2.52 1.47 0.23 14.25 2.55 1.49 0.21 14.50 2.57 1.52 0.20 14.75 2.60 1.54 0.19 15.00 2.62 1.56 0.18 15.25 2.64 1.58 0.17 15.50 2.66 1.60 0.16 15.75 2.68 1.62 0.15 16.00 2.70 1.63 0.14 16.25 2.72 1.65 0.13 16.50 2.74 1.66 0.13 16.75 2.75 1.68 0.13 17.00 2.77 1.69 0.12 17.25 2.78 1.71 0.12 17.50 2.80 1.72 0.12 17.75 2.81 1.73 0.11 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 2.83 1.74 0.11 18.25 2.84 1.76 0.11 18.50 2.85 1.77 0.10 18.75 2.87 1.78 0.10 19.00 2.88 1.79 0.09 19.25 2.89 1.80 0.09 19.50 2.90 1.81 0.09 19.75 2.91 1.82 0.08 20.00 2.92 1.83 0.08 UVA CCU Prelim Storm Prepared by Timmons Gro( Type 11 24-hr 1-year Rainfall=3.07" Printed 4/3/2023 Summary for Subcatchment 27S: POST DEVELOPED UNROUTED DISTURBED Runoff = 1.71 cfs @ 11.98 hrs, Volume= 0.074 af, Depth> 1.13" Routed to Link 23L : POST AP 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1-year Rainfall=3.07" Area (ac) CN Description 0.380 98 0.410 61 >75% Grass cover, Good, HSG B 0.790 79 Weighted Average 0.410 51.90% Pervious Area 0.380 48.10% Impervious Area Tc Length Capacity Description Direct Entry, Subcatchment 27S: POST DEVELOPED UNROUTED DISTURBED Hydrograph ❑ Runoff Type II 24-hr 1-year Rainfall=3.07" Runoff Area=0.790 ac Runoff Volume=0.074 of Runoff Depth>1.13" Tc=6.0 min CN=79 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) UVA CCU Prelim Storm Prepared by Timmons Grot Type/1 24-hr 1-year Rainfall=3.07" Printed 4/3/2023 Hydrograph for Subcatchment 27S: POST DEVELOPED UNROUTED DISTURBED Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.19 0.00 0.00 5.25 0.21 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.25 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.29 0.00 0.00 7.00 0.30 0.00 0.00 7.25 0.32 0.00 0.00 7.50 0.34 0.00 0.00 7.75 0.35 0.00 0.00 8.00 0.37 0.00 0.00 8.25 0.39 0.00 0.00 8.50 0.41 0.00 0.00 8.75 0.43 0.00 0.00 9.00 0.45 0.00 0.00 9.25 0.48 0.00 0.00 9.50 0.50 0.00 0.00 9.75 0.53 0.00 0.00 10.00 0.56 0.00 0.00 10.25 0.59 0.00 0.00 10.50 0.63 0.00 0.01 10.75 0.67 0.01 0.01 11.00 0.72 0.01 0.02 11.25 0.79 0.02 0.03 11.50 0.87 0.04 0.05 11.75 1.19 0.13 0.35 12.00 2.04 0.54 1.64 12.25 2.17 0.62 0.25 12.50 2.26 0.68 0.17 12.75 2.32 0.72 0.12 13.00 2.37 0.75 0.10 13.25 2.41 0.78 0.09 13.50 2.45 0.81 0.08 13.75 2.49 0.83 0.07 14.00 2.52 0.85 0.06 14.25 2.55 0.87 0.06 14.50 2.57 0.89 0.06 14.75 2.60 0.90 0.05 15.00 2.62 0.92 0.05 15.25 2.64 0.93 0.05 15.50 2.66 0.95 0.05 15.75 2.68 0.96 0.04 16.00 2.70 0.98 0.04 16.25 2.72 0.99 0.04 16.50 2.74 1.00 0.04 16.75 2.75 1.01 0.04 17.00 2.77 1.02 0.04 17.25 2.78 1.03 0.03 17.50 2.80 1.04 0.03 17.75 2.81 1.05 0.03 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 2.83 1.06 0.03 18.25 2.84 1.07 0.03 18.50 2.85 1.08 0.03 18.75 2.87 1.09 0.03 19.00 2.88 1.10 0.03 19.25 2.89 1.11 0.03 19.50 2.90 1.12 0.03 19.75 2.91 1.12 0.02 20.00 2.92 1.13 0.02 UVA CCU Prelim Storm Prepared by Timmons Gro( Type/1 24-hr 1-year Rainfall=3.07" Printed 4/3/2023 Summary for Subcatchment 42S: DISTURBED SHEET FLOW 3 Runoff = 0.02 cfs @ 12.00 hrs, Volume= 0.001 af, Depth> 0.34" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1-year Rainfall=3.07" Area (ac) CN Description 0.000 98 0.030 61 >75% Grass cover, Good, HSG B 0.030 61 Weighted Average 0.030 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 42S: DISTURBED SHEET FLOW 3 Hydrograph 0017 ---- 0016 ____ .___ J____I----L----I-- not 0.015 ___ -____I____ ----____T ----I__ I ------------- I I I I I 0013 I I I I I I 0012 I 0.011 I I I I I 0.01 I I I N r ---- - - -T 0 0.008 Q 007 I _ 0.006 0.005 0.004 0.003 0.002 -------1----'-- ----I----r----- ❑Runoff --- ---- Type II 24-hr ---=----- --- -- 1-year Rainfall=3.07" Runoff Area'=0.030 ec -- -Runoff Volume=0.001 'laf Runof#Depth>' G.34" ------r------------ ----------------T4b-6A-njj - I I I 1 I I N=, 1- - I I 1 1 I I I I I I I I I I I 10 11 12 13 Time (hours) UVA CCU Prelim Storm Prepared by Timmons Grot Type/1 24-hr 1-year Rainfall=3.07" Printed 4/3/2023 Hydrograph for Subcatchment 42S: DISTURBED SHEET FLOW 3 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.19 0.00 0.00 5.25 0.21 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.25 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.29 0.00 0.00 7.00 0.30 0.00 0.00 7.25 0.32 0.00 0.00 7.50 0.34 0.00 0.00 7.75 0.35 0.00 0.00 8.00 0.37 0.00 0.00 8.25 0.39 0.00 0.00 8.50 0.41 0.00 0.00 8.75 0.43 0.00 0.00 9.00 0.45 0.00 0.00 9.25 0.48 0.00 0.00 9.50 0.50 0.00 0.00 9.75 0.53 0.00 0.00 10.00 0.56 0.00 0.00 10.25 0.59 0.00 0.00 10.50 0.63 0.00 0.00 10.75 0.67 0.00 0.00 11.00 0.72 0.00 0.00 11.25 0.79 0.00 0.00 11.50 0.87 0.00 0.00 11.75 1.19 0.00 0.00 12.00 2.04 0.08 0.02 12.25 2.17 0.11 0.00 12.50 2.26 0.13 0.00 12.75 2.32 0.15 0.00 13.00 2.37 0.16 0.00 13.25 2.41 0.17 0.00 13.50 2.45 0.18 0.00 13.75 2.49 0.19 0.00 14.00 2.52 0.20 0.00 14.25 2.55 0.21 0.00 14.50 2.57 0.22 0.00 14.75 2.60 0.23 0.00 15.00 2.62 0.23 0.00 15.25 2.64 0.24 0.00 15.50 2.66 0.25 0.00 15.75 2.68 0.25 0.00 16.00 2.70 0.26 0.00 16.25 2.72 0.26 0.00 16.50 2.74 0.27 0.00 16.75 2.75 0.28 0.00 17.00 2.77 0.28 0.00 17.25 2.78 0.29 0.00 17.50 2.80 0.29 0.00 17.75 2.81 0.30 0.00 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 2.83 0.30 0.00 18.25 2.84 0.31 0.00 18.50 2.85 0.31 0.00 18.75 2.87 0.32 0.00 19.00 2.88 0.32 0.00 19.25 2.89 0.32 0.00 19.50 2.90 0.33 0.00 19.75 2.91 0.33 0.00 20.00 2.92 0.34 0.00 UVA CCU Prelim Storm Prepared by Timmons Grot Type/1 24-hr 1-year Rainfall=3.07" Summary for Pond 25P: UGD Printed 4/3/2023 Inflow Area = 1.260 ac, 75.40% Impervious, Inflow Depth > 1.85" for 1-year event Inflow = 4.21 cfs @ 11.97 hrs, Volume= 0.194 of Outflow = 1.70 cfs @ 12.09 hrs, Volume= 0.194 af, Atten= 60%, Lag= 7.2 min Primary = 1.70 cfs @ 12.09 hrs, Volume= 0.194 of Routed to Link 23L : POST AP 1 Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 420.46' @ 12.09 hrs Surf.Area= 0.020 ac Storage= 0.043 of Plug -Flow detention time= 6.5 min calculated for 0.194 of (100% of inflow) Center -of -Mass det. time= 6.5 min ( 777.1 - 770.6 ) Volume Invert Avail.Storage Storage Description #1 417.00' 0.097 of 72.0" Round Pipe Storage L= 150.0' S= 0.0100 '/' Device Routing Invert Outlet Devices #1 Primary 417.00' 15.0" Round Culvert L= 77.0' Ke= 1.000 Inlet / Outlet Invert= 417.00' / 416.15' S= 0.0110 '/' Cc= 0.900 n= 0.011 Concrete pipe, straight & clean, Flow Area= 1.23 sf #2 Device 1 417.00' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 420.50' 14.0" W x 8.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 422.67' Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 0.33 Width (feet) 2.00 2.00 Primary OutFlow Max=1.69 cfs @ 12.09 hrs HW=420.45' (Free Discharge) L1=Culvert (Passes 1.69 cfs of 7.45 cfs potential flow) 2=Orifice/Grate (Orifice Controls 1.69 cfs @ 8.61 fps) 3=Orifice/Grate ( Controls 0.00 cfs) =Custom Weir/Orifice ( Controls 0.00 cfs) UVA CCU Prelim Storm Prepared by Timmons Gro( Pond 25P: UGD Hydrograph Time (houm) Type // 24-hr 1-year Rainfall=3.07" Printed 4/3/2023 ■ Inflow ■ Primary UVA CCU Prelim Storm Prepared by Timmons Grot Type/1 24-hr 1-year Rainfall=3.07" Hydrograph for Pond 25P: UGD Time Inflow Storage Elevation Primary (hours) (cfs) (acre-feet) (feet) (cfs) 5.00 0.00 0.000 417.00 0.00 5.50 0.00 0.000 417.00 0.00 6.00 0.00 0.000 417.01 0.00 6.50 0.00 0.000 417.02 0.00 7.00 0.01 0.000 417.03 0.01 7.50 0.01 0.000 417.05 0.01 8.00 0.02 0.000 417.07 0.02 8.50 0.02 0.000 417.08 0.02 9.00 0.03 0.000 417.10 0.03 9.50 0.04 0.000 417.11 0.04 10.00 0.05 0.000 417.13 0.05 10.50 0.08 0.000 417.17 0.08 11.00 0.13 0.000 417.21 0.13 11.50 0.24 0.000 417.31 0.24 12.00 3.97 0.035 420.09 1.59 12.50 0.36 0.013 418.87 1.20 13.00 0.22 0.000 417.30 0.22 13.50 0.17 0.000 417.25 0.17 14.00 0.13 0.000 417.22 0.13 14.50 0.12 0.000 417.20 0.12 15.00 0.11 0.000 417.19 0.11 15.50 0.09 0.000 417.18 0.09 16.00 0.08 0.000 417.17 0.08 16.50 0.08 0.000 417.16 0.08 17.00 0.07 0.000 417.16 0.07 17.50 0.07 0.000 417.15 0.07 18.00 0.06 0.000 417.15 0.06 18.50 0.06 0.000 417.14 0.06 19.00 0.06 0.000 417.13 0.06 19.50 0.05 0.000 417.13 0.05 20.00 0.05 0.000 417.12 0.05 Printed 4/3/2023 UVA CCU Prelim Storm Prepared by Timmons Gro( Type/1 24-hr 1-year Rainfall=3.07" Printed 4/3/2023 Summary for Link 23L: POST AP 1 Inflow Area = 4.210 ac, 70.78% Impervious, Inflow Depth > 1.70" for 1-year event Inflow = 10.33 cfs @ 11.97 hrs, Volume= 0.598 of Primary = 10.33 cfs @ 11.97 hrs, Volume= 0.598 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 23L: POST AP 1 Hydrograph I I I I I iQ _I -{ -I I I I I I I I I I I I I I I I I I 7 42 I I o I I I I I I I I I I 1 Inflow Area=4.210 ac I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I ____________ r I 1 12 13 14 Time (hours) FE ]—I n—fl.—. ❑ Primary UVA CCU Prelim Storm Prepared by Timmons Grot Type/1 24-hr 1-year Rainfall=3.07" Hydrograph for Link 23L: POST AP 1 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 5.00 0.00 0.00 0.00 5.25 0.00 0.00 0.00 5.50 0.00 0.00 0.00 5.75 0.00 0.00 0.00 6.00 0.00 0.00 0.00 6.25 0.00 0.00 0.00 6.50 0.01 0.00 0.01 6.75 0.01 0.00 0.01 7.00 0.02 0.00 0.02 7.25 0.02 0.00 0.02 7.50 0.03 0.00 0.03 7.75 0.03 0.00 0.03 8.00 0.04 0.00 0.04 8.25 0.05 0.00 0.05 8.50 0.06 0.00 0.06 8.75 0.07 0.00 0.07 9.00 0.09 0.00 0.09 9.25 0.10 0.00 0.10 9.50 0.10 0.00 0.10 9.75 0.12 0.00 0.12 10.00 0.15 0.00 0.15 10.25 0.18 0.00 0.18 10.50 0.22 0.00 0.22 10.75 0.28 0.00 0.28 11.00 0.36 0.00 0.36 11.25 0.50 0.00 0.50 11.50 0.69 0.00 0.69 11.75 3.23 0.00 3.23 12.00 9.99 0.00 9.99 12.25 2.75 0.00 2.75 12.50 1.98 0.00 1.98 12.75 1.02 0.00 1.02 13.00 0.71 0.00 0.71 13.25 0.61 0.00 0.61 13.50 0.54 0.00 0.54 13.75 0.48 0.00 0.48 14.00 0.42 0.00 0.42 14.25 0.39 0.00 0.39 14.50 0.38 0.00 0.38 14.75 0.36 0.00 0.36 15.00 0.34 0.00 0.34 15.25 0.32 0.00 0.32 15.50 0.30 0.00 0.30 15.75 0.28 0.00 0.28 16.00 0.26 0.00 0.26 16.25 0.25 0.00 0.25 16.50 0.25 0.00 0.25 16.75 0.24 0.00 0.24 17.00 0.23 0.00 0.23 17.25 0.23 0.00 0.23 17.50 0.22 0.00 0.22 17.75 0.21 0.00 0.21 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 18.00 0.20 0.00 0.20 18.25 0.20 0.00 0.20 18.50 0.19 0.00 0.19 18.75 0.18 0.00 0.18 19.00 0.18 0.00 0.18 19.25 0.17 0.00 0.17 19.50 0.16 0.00 0.16 19.75 0.16 0.00 0.16 20.00 0.15 0.00 0.15 Printed 4/3/2023 UVA CCU Prelim Storm Prepared by Timmons Gro( Type II 24-hr 10-year Rainfall=5.58" Printed 4/3/2023 Summary for Subcatchment 23S: POST DEVELOPED ROUTED DISTURBED Runoff = 5.68 cfs @ 11.96 hrs, Volume= 0.277 af, Depth> 4.16" Routed to Pond 25P : UGD Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10-year Rainfall=5.58" Area (ac) CN Description ' 0.620 98 0.180 61 >75% Grass cover, Good, HSG B 0.800 90 Weighted Average 0.180 22.50% Pervious Area 0.620 77.50% Impervious Area Tc Length Capacity Description 6.0 Direct Entry, Subcatchment 23S: POST DEVELOPED ROUTED DISTURBED Hydrograph ----------------- 6 I I I I I y,gq,jy I I I I I I I I I I I I Type II 24-hr -------------- 5 ' 10-year Rainfall=5.58" I I I I I I I I I I I Runoff Area=0.800 ac 4 Runoff Volume=0.277 of Runoff Depth>4.16" 3 Tc=6.0 min LL I I CN=90 2 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Runoff UVA CCU Prelim Storm Prepared by Timmons Grot Type II 24-hr 10-year Rainfall=5.58" Printed 4/3/2023 Hydrograph for Subcatchment 23S: POST DEVELOPED ROUTED DISTURBED Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.35 0.01 0.01 5.25 0.37 0.02 0.02 5.50 0.40 0.02 0.02 5.75 0.42 0.03 0.02 6.00 0.45 0.04 0.02 6.25 0.47 0.05 0.03 6.50 0.50 0.05 0.03 6.75 0.52 0.06 0.03 7.00 0.55 0.08 0.04 7.25 0.58 0.09 0.04 7.50 0.61 0.10 0.04 7.75 0.64 0.11 0.04 8.00 0.67 0.13 0.05 8.25 0.70 0.14 0.05 8.50 0.74 0.16 0.06 8.75 0.78 0.18 0.07 9.00 0.82 0.21 0.08 9.25 0.86 0.24 0.09 9.50 0.91 0.26 0.09 9.75 0.96 0.29 0.10 10.00 1.01 0.33 0.11 10.25 1.07 0.37 0.13 10.50 1.14 0.41 0.15 10.75 1.22 0.47 0.19 11.00 1.31 0.54 0.23 11.25 1.43 0.63 0.30 11.50 1.58 0.75 0.39 11.75 2.16 1.23 1.86 12.00 3.70 2.64 5.29 12.25 3.94 2.86 0.72 12.50 4.10 3.02 0.46 12.75 4.21 3.12 0.34 13.00 4.31 3.21 0.28 13.25 4.39 3.29 0.24 13.50 4.46 3.36 0.21 13.75 4.52 3.42 0.19 14.00 4.58 3.47 0.17 14.25 4.63 3.52 0.15 14.50 4.67 3.56 0.15 14.75 4.72 3.61 0.14 15.00 4.76 3.65 0.13 15.25 4.80 3.69 0.13 15.50 4.84 3.72 0.12 15.75 4.88 3.76 0.11 16.00 4.91 3.79 0.10 16.25 4.94 3.82 0.10 16.50 4.97 3.85 0.10 16.75 5.00 3.88 0.09 17.00 5.03 3.91 0.09 17.25 5.06 3.93 0.09 17.50 5.09 3.96 0.08 17.75 5.11 3.99 0.08 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 5.14 4.01 0.08 18.25 5.16 4.03 0.08 18.50 5.19 4.06 0.07 18.75 5.21 4.08 0.07 19.00 5.23 4.10 0.07 19.25 5.25 4.12 0.07 19.50 5.27 4.14 0.06 19.75 5.29 4.16 0.06 20.00 5.31 4.18 0.06 UVA CCU Prelim Storm Prepared by Timmons Gro( Type II 24-hr 10-year Rainfall=5.58" Printed 4/3/2023 Summary for Subcatchment 24S: POST DEVELOPED ROUTED UNDISTURBED Runoff = 3.16 cfs @ 11.96 hrs, Volume= 0.152 af, Depth> 3.96" Routed to Pond 25P : UGD Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10-year Rainfall=5.58" Area (ac) CN Description 0.330 98 0.130 61 >75% Grass cover, Good, HSG B 0.460 88 Weighted Average 0.130 28.26% Pervious Area 0.330 71.74% Impervious Area Tc Length Capacity Description Direct Entry, Subcatchment 24S: POST DEVELOPED ROUTED UNDISTURBED Hydrograph ❑ Runoff Type II 24-hr 10-year Rainfall=5.58" Runoff Area=0.460 ac --- 'Runoff Volume=0.152 of Runoff Depth>3.96" Tc=6.0 min 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) UVA CCU Prelim Storm Prepared by Timmons Grot Type II 24-hr 10-year Rainfall=5.58" Printed 4/3/2023 Hydrograph for Subcatchment 24S: POST DEVELOPED ROUTED UNDISTURBED Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.35 0.00 0.00 5.25 0.37 0.01 0.01 5.50 0.40 0.01 0.01 5.75 0.42 0.01 0.01 6.00 0.45 0.02 0.01 6.25 0.47 0.03 0.01 6.50 0.50 0.03 0.01 6.75 0.52 0.04 0.01 7.00 0.55 0.05 0.02 7.25 0.58 0.06 0.02 7.50 0.61 0.07 0.02 7.75 0.64 0.08 0.02 8.00 0.67 0.09 0.02 8.25 0.70 0.10 0.03 8.50 0.74 0.12 0.03 8.75 0.78 0.14 0.03 9.00 0.82 0.16 0.04 9.25 0.86 0.18 0.04 9.50 0.91 0.20 0.04 9.75 0.96 0.23 0.05 10.00 1.01 0.26 0.06 10.25 1.07 0.29 0.07 10.50 1.14 0.34 0.08 10.75 1.22 0.39 0.10 11.00 1.31 0.45 0.12 11.25 1.43 0.53 0.16 11.50 1.58 0.64 0.21 11.75 2.16 1.10 1.01 12.00 3.70 2.45 2.95 12.25 3.94 2.67 0.40 12.50 4.10 2.82 0.26 12.75 4.21 2.93 0.19 13.00 4.31 3.02 0.16 13.25 4.39 3.09 0.14 13.50 4.46 3.16 0.12 13.75 4.52 3.22 0.11 14.00 4.58 3.27 0.09 14.25 4.63 3.31 0.09 14.50 4.67 3.36 0.08 14.75 4.72 3.40 0.08 15.00 4.76 3.44 0.08 15.25 4.80 3.48 0.07 15.50 4.84 3.52 0.07 15.75 4.88 3.55 0.06 16.00 4.91 3.58 0.06 16.25 4.94 3.61 0.06 16.50 4.97 3.64 0.05 16.75 5.00 3.67 0.05 17.00 5.03 3.70 0.05 17.25 5.06 3.73 0.05 17.50 5.09 3.75 0.05 17.75 5.11 3.78 0.05 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 5.14 3.80 0.04 18.25 5.16 3.82 0.04 18.50 5.19 3.85 0.04 18.75 5.21 3.87 0.04 19.00 5.23 3.89 0.04 19.25 5.25 3.91 0.04 19.50 5.27 3.93 0.04 19.75 5.29 3.95 0.03 20.00 5.31 3.97 0.03 UVA CCU Prelim Storm Prepared by Timmons Gro( Type II 24-hr 10-year Rainfall=5.58" Printed 4/3/2023 Summary for Subcatchment 25S: POST DEVELOPED UNROUTED UNDISTURBED Runoff = 15.10 cfs @ 11.96 hrs, Volume= 0.731 af, Depth> 4.06" Routed to Link 23L : POST AP 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10-year Rainfall=5.58" Area (ac) CN Description 1.650 98 0.510 61 >75% Grass cover, Good, HSG B 2.160 89 Weighted Average 0.510 23.61 % Pervious Area 1.650 76.39% Impervious Area Tc Length Capacity Description 6.0 Direct Entry, Subcatchment 25S: POST DEVELOPED UNROUTED UNDISTURBED 16 __-----+_ 15 _____I____J 14 I I I I 13 12 I I I I 10 I N -y -- -I 9 38, ' ° ----I--------I -- - - LL 7 I I I I I 5 I I I I I 4 3 I I I 5 6 Hydrograph 7____I____7____7___7____ 7____'I____ 7____ ■Run°ft ----+---- I____JI__ 1____Ii ___JI_Type_W2*y -- ------10"ar RainfalCr5.58'�- -+-___+----f----I----+-___ -- ---- 11---- Runbff-AreA=2160;ac- - ----Ru�tofF'1Volumo=0--.731,af- --,------T-R' Depth�4.06_' - --J-- ------ -- r =1--- Tc=660-1"!M- I I T____ 7___ 7____ 7 7____ I I I I I I I I 10 11 12 13 14 15 16 17 18 19 20 Time (hours) UVA CCU Prelim Storm Prepared by Timmons Grot Type II 24-hr 10-year Rainfall=5.58" Printed 4/3/2023 Hydrograph for Subcatchment 25S: POST DEVELOPED UNROUTED UNDISTURBED Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.35 0.01 0.03 5.25 0.37 0.01 0.03 5.50 0.40 0.02 0.04 5.75 0.42 0.02 0.05 6.00 0.45 0.03 0.05 6.25 0.47 0.03 0.06 6.50 0.50 0.04 0.07 6.75 0.52 0.05 0.08 7.00 0.55 0.06 0.08 7.25 0.58 0.07 0.09 7.50 0.61 0.08 0.10 7.75 0.64 0.09 0.11 8.00 0.67 0.11 0.12 8.25 0.70 0.12 0.13 8.50 0.74 0.14 0.15 8.75 0.78 0.16 0.17 9.00 0.82 0.18 0.20 9.25 0.86 0.21 0.21 9.50 0.91 0.23 0.22 9.75 0.96 0.26 0.25 10.00 1.01 0.29 0.29 10.25 1.07 0.33 0.34 10.50 1.14 0.37 0.40 10.75 1.22 0.43 0.48 11.00 1.31 0.49 0.58 11.25 1.43 0.58 0.77 11.50 1.58 0.69 1.02 11.75 2.16 1.16 4.88 12.00 3.70 2.54 14.08 12.25 3.94 2.77 1.92 12.50 4.10 2.92 1.24 12.75 4.21 3.02 0.90 13.00 4.31 3.11 0.76 13.25 4.39 3.19 0.65 13.50 4.46 3.26 0.57 13.75 4.52 3.31 0.51 14.00 4.58 3.37 0.45 14.25 4.63 3.41 0.42 14.50 4.67 3.46 0.40 14.75 4.72 3.50 0.38 15.00 4.76 3.54 0.36 15.25 4.80 3.58 0.34 15.50 4.84 3.62 0.32 15.75 4.88 3.65 0.29 16.00 4.91 3.69 0.27 16.25 4.94 3.72 0.26 16.50 4.97 3.75 0.26 16.75 5.00 3.77 0.25 17.00 5.03 3.80 0.24 17.25 5.06 3.83 0.23 17.50 5.09 3.86 0.23 17.75 5.11 3.88 0.22 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 5.14 3.91 0.21 18.25 5.16 3.93 0.21 18.50 5.19 3.95 0.20 18.75 5.21 3.97 0.19 19.00 5.23 4.00 0.18 19.25 5.25 4.02 0.18 19.50 5.27 4.03 0.17 19.75 5.29 4.05 0.16 20.00 5.31 4.07 0.15 UVA CCU Prelim Storm Prepared by Timmons Gro( Type II 24-hr 10-year Rainfall=5.58" Printed 4/3/2023 Summary for Subcatchment 27S: POST DEVELOPED UNROUTED DISTURBED Runoff = 4.45 cfs @ 11.97 hrs, Volume= 0.202 af, Depth> 3.07" Routed to Link 23L : POST AP 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10-year Rainfall=5.58" Area (ac) CN Description 0.380 98 0.410 61 >75% Grass cover, Good, HSG B 0.790 79 Weighted Average 0.410 51.90% Pervious Area 0.380 48.10% Impervious Area Tc Length 0 F 5 Capacity Description Direct Entry, Subcatchment 27S: POST DEVELOPED UNROUTED DISTURBED Hydrograph I I I I I I I I I I I I I I I I I I I I I I I I I I I I I p I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I i I I I I I I I I I I I I I I I I I I I I I I I I Type II 24-hr 10-year Rainfall=5.58" Runoff Area=0.790 ac 'Runoff Volume=0.202 of Runoff Depth>3.07" Tc=6.0 min CN=79 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Runoff UVA CCU Prelim Storm Prepared by Timmons Grot Type II 24-hr 10-year Rainfall=5.58" Printed 4/3/2023 Hydrograph for Subcatchment 27S: POST DEVELOPED UNROUTED DISTURBED Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.35 0.00 0.00 5.25 0.37 0.00 0.00 5.50 0.40 0.00 0.00 5.75 0.42 0.00 0.00 6.00 0.45 0.00 0.00 6.25 0.47 0.00 0.00 6.50 0.50 0.00 0.00 6.75 0.52 0.00 0.00 7.00 0.55 0.00 0.00 7.25 0.58 0.00 0.00 7.50 0.61 0.00 0.00 7.75 0.64 0.00 0.01 8.00 0.67 0.01 0.01 8.25 0.70 0.01 0.01 8.50 0.74 0.01 0.02 8.75 0.78 0.02 0.02 9.00 0.82 0.03 0.02 9.25 0.86 0.04 0.03 9.50 0.91 0.05 0.03 9.75 0.96 0.06 0.04 10.00 1.01 0.07 0.05 10.25 1.07 0.09 0.06 10.50 1.14 0.11 0.07 10.75 1.22 0.14 0.09 11.00 1.31 0.18 0.12 11.25 1.43 0.23 0.17 11.50 1.58 0.30 0.23 11.75 2.16 0.62 1.23 12.00 3.70 1.72 4.22 12.25 3.94 1.92 0.60 12.50 4.10 2.05 0.39 12.75 4.21 2.14 0.29 13.00 4.31 2.22 0.24 13.25 4.39 2.28 0.21 13.50 4.46 2.34 0.18 13.75 4.52 2.39 0.16 14.00 4.58 2.44 0.15 14.25 4.63 2.48 0.13 14.50 4.67 2.52 0.13 14.75 4.72 2.56 0.12 15.00 4.76 2.60 0.12 15.25 4.80 2.63 0.11 15.50 4.84 2.67 0.10 15.75 4.88 2.70 0.10 16.00 4.91 2.72 0.09 16.25 4.94 2.75 0.09 16.50 4.97 2.78 0.08 16.75 5.00 2.80 0.08 17.00 5.03 2.83 0.08 17.25 5.06 2.85 0.08 17.50 5.09 2.88 0.07 17.75 5.11 2.90 0.07 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 5.14 2.92 0.07 18.25 5.16 2.94 0.07 18.50 5.19 2.96 0.07 18.75 5.21 2.98 0.06 19.00 5.23 3.00 0.06 19.25 5.25 3.02 0.06 19.50 5.27 3.04 0.06 19.75 5.29 3.06 0.05 20.00 5.31 3.07 0.05 UVA CCU Prelim Storm Prepared by Timmons Gro( Type II 24-hr 10-year Rainfall=5.58" Printed 4/3/2023 Summary for Subcatchment 42S: DISTURBED SHEET FLOW 3 Runoff = 0.09 cfs @ 11.98 hrs, Volume= 0.004 af, Depth> 1.56" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10-year Rainfall=5.58" Area (ac) CN Description 0.000 98 0.030 61 >75% Grass cover, Good, HSG B 0.030 61 Weighted Average 0.030 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 42S: DISTURBED SHEET FLOW 3 Hydrograph � ----- ❑Runoff 9.995 ----i----i 9.9s - - ---- Type II 24-hr 9.98 ----. ----------�---- -- - -�-------10-year RainfallT Runoff Area=0.030ac- ---- - 9.965 9.96 ___ _. ___-_. __ L --`--------�____i____�__ Rurioffl"IL Mg-0.�D4��at w 9.955 ___ _. __ ---i----�i - -- �� 1�is V ___ ----�i i----i RtmQ1TDe�t11�1.�6rr o.95 LLo.945 ___ _. ___._. -- ___a____11---- __�___a-------------�-_ ;---- Il-_ ____i____4____ - ___ i____t___ i____1--TAb-6r0-niin-- 994 ___ _. y __ ___'____�____'____�__ r --------r--------r---�--- 9.935 i �� 1 9.03 i 9.925 ---4- - i 9.92 ---4- 9.915 ---' --i 19 11 12 13 14 15 16 17 18 19 Time (hours) UVA CCU Prelim Storm Prepared by Timmons Grot Type II 24-hr 10-year Rainfall=5.58" Printed 4/3/2023 Hydrograph for Subcatchment 42S: DISTURBED SHEET FLOW 3 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.35 0.00 0.00 5.25 0.37 0.00 0.00 5.50 0.40 0.00 0.00 5.75 0.42 0.00 0.00 6.00 0.45 0.00 0.00 6.25 0.47 0.00 0.00 6.50 0.50 0.00 0.00 6.75 0.52 0.00 0.00 7.00 0.55 0.00 0.00 7.25 0.58 0.00 0.00 7.50 0.61 0.00 0.00 7.75 0.64 0.00 0.00 8.00 0.67 0.00 0.00 8.25 0.70 0.00 0.00 8.50 0.74 0.00 0.00 8.75 0.78 0.00 0.00 9.00 0.82 0.00 0.00 9.25 0.86 0.00 0.00 9.50 0.91 0.00 0.00 9.75 0.96 0.00 0.00 10.00 1.01 0.00 0.00 10.25 1.07 0.00 0.00 10.50 1.14 0.00 0.00 10.75 1.22 0.00 0.00 11.00 1.31 0.00 0.00 11.25 1.43 0.00 0.00 11.50 1.58 0.01 0.00 11.75 2.16 0.11 0.01 12.00 3.70 0.66 0.09 12.25 3.94 0.78 0.01 12.50 4.10 0.86 0.01 12.75 4.21 0.92 0.01 13.00 4.31 0.97 0.01 13.25 4.39 1.02 0.01 13.50 4.46 1.06 0.00 13.75 4.52 1.09 0.00 14.00 4.58 1.12 0.00 14.25 4.63 1.15 0.00 14.50 4.67 1.18 0.00 14.75 4.72 1.20 0.00 15.00 4.76 1.23 0.00 15.25 4.80 1.25 0.00 15.50 4.84 1.27 0.00 15.75 4.88 1.30 0.00 16.00 4.91 1.32 0.00 16.25 4.94 1.33 0.00 16.50 4.97 1.35 0.00 16.75 5.00 1.37 0.00 17.00 5.03 1.39 0.00 17.25 5.06 1.41 0.00 17.50 5.09 1.42 0.00 17.75 5.11 1.44 0.00 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 5.14 1.45 0.00 18.25 5.16 1.47 0.00 18.50 5.19 1.48 0.00 18.75 5.21 1.50 0.00 19.00 5.23 1.51 0.00 19.25 5.25 1.52 0.00 19.50 5.27 1.54 0.00 19.75 5.29 1.55 0.00 20.00 5.31 1.56 0.00 UVA CCU Prelim Storm Prepared by Timmons Grot Type II 24-hr 10-year Rainfall=5.58" Summary for Pond 25P: UGD Printed 4/3/2023 Inflow Area = 1.260 ac, 75.40% Impervious, Inflow Depth > 4.09" for 10-year event Inflow = 8.84 cfs @ 11.96 hrs, Volume= 0.429 of Outflow = 6.64 cfs @ 12.03 hrs, Volume= 0.429 af, Atten= 25%, Lag= 3.9 min Primary = 6.64 cfs @ 12.03 hrs, Volume= 0.429 of Routed to Link 23L : POST AP 1 Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 422.29' @ 12.03 hrs Surf.Area= 0.017 ac Storage= 0.079 of Plug -Flow detention time= 6.5 min calculated for 0.429 of (100% of inflow) Center -of -Mass det. time= 6.4 min ( 759.4 - 753.0 ) Volume Invert Avail.Storage Storage Description #1 417.00' 0.097 of 72.0" Round Pipe Storage L= 150.0' S= 0.0100 ? Device Routing Invert Outlet Devices #1 Primary 417.00' 15.0" Round Culvert L= 77.0' Ke= 1.000 Inlet / Outlet Invert= 417.00' / 416.15' S= 0.0110 '/' Cc= 0.900 n= 0.011 Concrete pipe, straight & clean, Flow Area= 1.23 sf #2 Device 1 417.00' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 420.50' 14.0" W x 8.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 422.67' Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 0.33 Width (feet) 2.00 2.00 Primary OutFlow Max=6.51 cfs @ 12.03 hrs HW=422.22' (Free Discharge) L1=Culvert (Passes 6.51 cfs of 9.50 cfs potential flow) 2=Orifice/Grate (Orifice Controls 2.11 cfs @ 10.74 fps) 3=Orifice/Grate (Orifice Controls 4.40 cfs @ 5.66 fps) =Custom Weir/Orifice ( Controls 0.00 cfs) UVA CCU Prelim Storm Prepared by Timmons Gro( Type 1124-hr 10-year Rainfall=5.58" Printed 4/3/2023 Pond 25P: UGD Hydrograph � ea■nflow ■PdmaI ' I I I Ie.aa cra I I I I I I I I Primary I I I I of I I I - I I gI I I 7 Y*4 2.ryS-- s� Storage-O.,/ 9 of _ 6- 3- 2- 5 6 7 1 12 13 14 15 16 Time (hours) UVA CCU Prelim Storm Prepared by Timmons Grot Type II 24-hr 10-year Rainfall=5.58" Hydrograph for Pond 25P: UGD Time Inflow Storage Elevation Primary (hours) (cfs) (acre-feet) (feet) (cfs) 5.00 0.02 0.000 417.07 0.02 5.50 0.03 0.000 417.09 0.02 6.00 0.03 0.000 417.10 0.03 6.50 0.04 0.000 417.11 0.04 7.00 0.05 0.000 417.13 0.05 7.50 0.06 0.000 417.14 0.06 8.00 0.07 0.000 417.15 0.07 8.50 0.09 0.000 417.18 0.09 9.00 0.12 0.000 417.20 0.12 9.50 0.13 0.000 417.22 0.13 10.00 0.17 0.000 417.25 0.17 10.50 0.23 0.000 417.30 0.23 11.00 0.34 0.000 417.38 0.34 11.50 0.60 0.001 417.62 0.57 12.00 8.24 0.077 422.20 6.46 12.50 0.72 0.031 419.86 1.53 13.00 0.44 0.003 418.00 0.82 13.50 0.33 0.000 417.38 0.34 14.00 0.26 0.000 417.33 0.26 14.50 0.23 0.000 417.30 0.23 15.00 0.21 0.000 417.28 0.21 15.50 0.18 0.000 417.26 0.18 16.00 0.16 0.000 417.24 0.16 16.50 0.15 0.000 417.23 0.15 17.00 0.14 0.000 417.23 0.14 17.50 0.13 0.000 417.22 0.13 18.00 0.12 0.000 417.21 0.12 18.50 0.12 0.000 417.20 0.12 19.00 0.11 0.000 417.19 0.11 19.50 0.10 0.000 417.18 0.10 20.00 0.09 0.000 417.18 0.09 Printed 4/3/2023 UVA CCU Prelim Storm Prepared by Timmons Gro( Type II 24-hr 10-year Rainfall=5.58" Printed 4/3/2023 Summary for Link 23L: POST AP 1 Inflow Area = 4.210 ac, 70.78% Impervious, Inflow Depth > 3.88" for 10-year event Inflow = 25.53 cfs @ 11.98 hrs, Volume= 1.362 of Primary = 25.53 cfs @ 11.98 hrs, Volume= 1.362 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 23L: POST AP 1 Hydrograph 28 I I I zs sa as 26 - r -I 2s s3 rs Infllow;Area=4.-310 ac- _1 _J _L _J _L 24 I I I I I I I I I I I I I I I I I 22 -I _♦ -I I I _. I -y —I _♦ I I I I I I 26 ___ ________ I I __ I _______ ________ ___I I I I I I I I 18 I I I I I I .� 16 u I I I I I I I I I I I I I I I 14 o I I I I I I I I I I I I I I LL 12 I I 10- T I r_- I I I I I 8 I 6 I __4---- I____r_ I I 1 12 13 14 Time (hours) ❑ Inflow ❑ Primary UVA CCU Prelim Storm Prepared by Timmons Grot Type II 24-hr 10-year Rainfall=5.58" Hydrograph for Link 23L: POST AP 1 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 5.00 0.04 0.00 0.04 5.25 0.05 0.00 0.05 5.50 0.06 0.00 0.06 5.75 0.08 0.00 0.08 6.00 0.09 0.00 0.09 6.25 0.10 0.00 0.10 6.50 0.11 0.00 0.11 6.75 0.12 0.00 0.12 7.00 0.14 0.00 0.14 7.25 0.15 0.00 0.15 7.50 0.16 0.00 0.16 7.75 0.18 0.00 0.18 8.00 0.19 0.00 0.19 8.25 0.22 0.00 0.22 8.50 0.26 0.00 0.26 8.75 0.30 0.00 0.30 9.00 0.34 0.00 0.34 9.25 0.37 0.00 0.37 9.50 0.38 0.00 0.38 9.75 0.43 0.00 0.43 10.00 0.50 0.00 0.50 10.25 0.59 0.00 0.59 10.50 0.70 0.00 0.70 10.75 0.85 0.00 0.85 11.00 1.04 0.00 1.04 11.25 1.38 0.00 1.38 11.50 1.83 0.00 1.83 11.75 7.31 0.00 7.31 12.00 24.77 0.00 24.77 12.25 4.42 0.00 4.42 12.50 3.15 0.00 3.15 12.75 2.43 0.00 2.43 13.00 1.81 0.00 1.81 13.25 1.24 0.00 1.24 13.50 1.09 0.00 1.09 13.75 0.97 0.00 0.97 14.00 0.86 0.00 0.86 14.25 0.79 0.00 0.79 14.50 0.76 0.00 0.76 14.75 0.72 0.00 0.72 15.00 0.68 0.00 0.68 15.25 0.64 0.00 0.64 15.50 0.60 0.00 0.60 15.75 0.56 0.00 0.56 16.00 0.53 0.00 0.53 16.25 0.50 0.00 0.50 16.50 0.49 0.00 0.49 16.75 0.48 0.00 0.48 17.00 0.46 0.00 0.46 17.25 0.45 0.00 0.45 17.50 0.43 0.00 0.43 17.75 0.42 0.00 0.42 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 18.00 0.41 0.00 0.41 18.25 0.39 0.00 0.39 18.50 0.38 0.00 0.38 18.75 0.37 0.00 0.37 19.00 0.35 0.00 0.35 19.25 0.34 0.00 0.34 19.50 0.32 0.00 0.32 19.75 0.31 0.00 0.31 20.00 0.30 0.00 0.30 Printed 4/3/2023 UVA CCU Prelim Storm Prepared by Timmons Grot TABLE OF CONTENTS Project Reports 1 Routing Diagram 2 Rainfall Events Listing (selected events) 1-year Event 3 Subcat 23S: POST DEVELOPED ROUTED DISTURBED 5 Subcat 24S: POST DEVELOPED ROUTED UNDISTURBED 7 Subcat 25S: POST DEVELOPED UNROUTED UNDISTURBED 9 Subcat 27S: POST DEVELOPED UNROUTED DISTURBED 11 Subcat 42S: DISTURBED SHEET FLOW 3 13 Pond 25P: UGD 16 Link 23L: POST AP 1 10-year Event 18 Subcat 23S: POST DEVELOPED ROUTED DISTURBED 20 Subcat 24S: POST DEVELOPED ROUTED UNDISTURBED 22 Subcat 25S: POST DEVELOPED UNROUTED UNDISTURBED 24 Subcat 27S: POST DEVELOPED UNROUTED DISTURBED 26 Subcat 42S: DISTURBED SHEET FLOW 3 28 Pond 25P: UGD 31 Link 23L: POST AP 1 Table of Contents Printed 4/3/2023 USDA United States Department of Agriculture MRCS Natural Resources Conservation Service A product of the National Cooperative Soil Survey, a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local participants Custom Soil Resource Report for Albemarle County, Virginia March 14, 2023 Preface Soil surveys contain information that affects land use planning in survey areas. They highlight soil limitations that affect various land uses and provide information about the properties of the soils in the survey areas. Soil surveys are designed for many different users, including farmers, ranchers, foresters, agronomists, urban planners, community officials, engineers, developers, builders, and home buyers. Also, conservationists, teachers, students, and specialists in recreation, waste disposal, and pollution control can use the surveys to help them understand, protect, or enhance the environment. Various land use regulations of Federal, State, and local governments may impose special restrictions on land use or land treatment. Soil surveys identify soil properties that are used in making various land use or land treatment decisions. The information is intended to help the land users identify and reduce the effects of soil limitations on various land uses. The landowner or user is responsible for identifying and complying with existing laws and regulations. Although soil survey information can be used for general farm, local, and wider area planning, onsite investigation is needed to supplement this information in some cases. Examples include soil quality assessments (http://www.nrGs.usda.govtwps/ portal/nres/main/soils/healthn and certain conservation and engineering applications. For more detailed information, contact your local USDA Service Center (https:Hoffices.sc.egov.usda.gov/locator/app?agency=nres) or your NRCS State Soil Scientist (http://www.nrGs.usda.govtwps/portal/nres/detail/soils/contactus/? cid=nres 142p2_053951). Great differences in soil properties can occur within short distances. Some soils are seasonally wet or subject to flooding. Some are too unstable to be used as a foundation for buildings or roads. Clayey or wet soils are poorly suited to use as septic tank absorption fields. A high water table makes a soil poorly suited to basements or underground installations. The National Cooperative Soil Survey is a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local agencies. The Natural Resources Conservation Service (NRCS) has leadership for the Federal part of the National Cooperative Soil Survey. Information about soils is updated periodically. Updated information is available through the NRCS Web Soil Survey, the site for official soil survey information. The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity provider and employer. 3 Contents Preface.................................................................................................................... 2 How Soil Surveys Are Made..................................................................................5 SoilMap.................................................................................................................. 8 SoilMap................................................................................................................9 Legend........................................................................................................ MapUnit Legend......................................................................................... MapUnit Descriptions................................................................................. Albemarle County, Virginia...................................................................... 21 B—Culpeper fine sandy loam, 2 to 7 percent slopes ....................... 21C—Culpeper fine sandy loam, 7 to 15 percent slopes .................... 22C3—Culpeper clay loam, 7 to 15 percent slopes, severely eroded. 76—Dan River loam, 0 to 2 percent slopes, occasionally flooded....... 83—Colvard fine sandy loam, 0 to 2 percent slopes, occasionally flooded........................................................................................... References.................................................................................................... El How Soil Surveys Are Made Soil surveys are made to provide information about the soils and miscellaneous areas in a specific area. They include a description of the soils and miscellaneous areas and their location on the landscape and tables that show soil properties and limitations affecting various uses. Soil scientists observed the steepness, length, and shape of the slopes; the general pattern of drainage; the kinds of crops and native plants; and the kinds of bedrock. They observed and described many soil profiles. A soil profile is the sequence of natural layers, or horizons, in a soil. The profile extends from the surface down into the unconsolidated material in which the soil formed or from the surface down to bedrock. The unconsolidated material is devoid of roots and other living organisms and has not been changed by other biological activity. Currently, soils are mapped according to the boundaries of major land resource areas (MLRAs). MLRAs are geographically associated land resource units that share common characteristics related to physiography, geology, climate, water resources, soils, biological resources, and land uses (USDA, 2006). Soil survey areas typically consist of parts of one or more MLRA. The soils and miscellaneous areas in a survey area occur in an orderly pattern that is related to the geology, landforms, relief, climate, and natural vegetation of the area. Each kind of soil and miscellaneous area is associated with a particular kind of landform or with a segment of the landform. By observing the soils and miscellaneous areas in the survey area and relating their position to specific segments of the landform, a soil scientist develops a concept, or model, of how they were formed. Thus, during mapping, this model enables the soil scientist to predict with a considerable degree of accuracy the kind of soil or miscellaneous area at a specific location on the landscape. Commonly, individual soils on the landscape merge into one another as their characteristics gradually change. To construct an accurate soil map, however, soil scientists must determine the boundaries between the soils. They can observe only a limited number of soil profiles. Nevertheless, these observations, supplemented by an understanding of the soil -vegetation -landscape relationship, are sufficient to verify predictions of the kinds of soil in an area and to determine the boundaries. Soil scientists recorded the characteristics of the soil profiles that they studied. They noted soil color, texture, size and shape of soil aggregates, kind and amount of rock fragments, distribution of plant roots, reaction, and other features that enable them to identify soils. After describing the soils in the survey area and determining their properties, the soil scientists assigned the soils to taxonomic classes (units). Taxonomic classes are concepts. Each taxonomic class has a set of soil characteristics with precisely defined limits. The classes are used as a basis for comparison to classify soils systematically. Soil taxonomy, the system of taxonomic classification used in the United States, is based mainly on the kind and character of soil properties and the arrangement of horizons within the profile. After the soil 5 Custom Soil Resource Report scientists classified and named the soils in the survey area, they compared the individual soils with similar soils in the same taxonomic class in other areas so that they could confirm data and assemble additional data based on experience and research. The objective of soil mapping is not to delineate pure map unit components; the objective is to separate the landscape into landforms or landform segments that have similar use and management requirements. Each map unit is defined by a unique combination of soil components and/or miscellaneous areas in predictable proportions. Some components may be highly contrasting to the other components of the map unit. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The delineation of such landforms and landform segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, onsite investigation is needed to define and locate the soils and miscellaneous areas. Soil scientists make many field observations in the process of producing a soil map. The frequency of observation is dependent upon several factors, including scale of mapping, intensity of mapping, design of map units, complexity of the landscape, and experience of the soil scientist. Observations are made to test and refine the soil -landscape model and predictions and to verify the classification of the soils at specific locations. Once the soil -landscape model is refined, a significantly smaller number of measurements of individual soil properties are made and recorded. These measurements may include field measurements, such as those for color, depth to bedrock, and texture, and laboratory measurements, such as those for content of sand, silt, clay, salt, and other components. Properties of each soil typically vary from one point to another across the landscape. Observations for map unit components are aggregated to develop ranges of characteristics for the components. The aggregated values are presented. Direct measurements do not exist for every property presented for every map unit component. Values for some properties are estimated from combinations of other properties. While a soil survey is in progress, samples of some of the soils in the area generally are collected for laboratory analyses and for engineering tests. Soil scientists interpret the data from these analyses and tests as well as the field -observed characteristics and the soil properties to determine the expected behavior of the soils under different uses. Interpretations for all of the soils are field tested through observation of the soils in different uses and under different levels of management. Some interpretations are modified to fit local conditions, and some new interpretations are developed to meet local needs. Data are assembled from other sources, such as research information, production records, and field experience of specialists. For example, data on crop yields under defined levels of management are assembled from farm records and from field or plot experiments on the same kinds of soil. Predictions about soil behavior are based not only on soil properties but also on such variables as climate and biological activity. Soil conditions are predictable over long periods of time, but they are not predictable from year to year. For example, soil scientists can predict with a fairly high degree of accuracy that a given soil will have a high water table within certain depths in most years, but they cannot predict that a high water table will always be at a specific level in the soil on a specific date. After soil scientists located and identified the significant natural bodies of soil in the survey area, they drew the boundaries of these bodies on aerial photographs and Custom Soil Resource Report identified each as a specific map unit. Aerial photographs show trees, buildings, fields, roads, and rivers, all of which help in locating boundaries accurately. IM Soil Map The soil map section includes the soil map for the defined area of interest, a list of soil map units on the map and extent of each map unit, and cartographic symbols displayed on the map. Also presented are various metadata about data used to produce the map, and a description of each soil map unit. M' 09 ' N p� N pM� N q� N {�Q Me 0'M-N Custom Soil Resource Report Soil Map N b b 71MM neso n8570 7186 3 Map Sole: 1:2,210 W pnnbed m A lardsope (11" x 8.5") sheet. Metes N 0 30 80 120 180 Feet A 0 0 0o zao aro wo Map pi*ctb: Web Maablr fAn wwdnal6: WGM4 Edged¢: UIM Zme 17NW(S84 9 MAPLEGEND Area of Interest (AOQ O Area of Interest (AOI) Solis Soil Map Unit Polygons N Soil Map Unit Lines Soil Map Unit Points Special Point Features V Blowout ® Borrow Pit Clay Spot O Closed Depression Gravel Pit Gravelly Spot O Landfill A. Lava Flow Marsh or swamp Mine or Quarry O Miscellaneous Water O Perennial Water y Rock Outcrop + Saline Spot Sandy Spot Severely Eroded Spot Q Sinkhole Slide or Slip J, Sodic Spot Custom Soil Resource Report MAP INFORMATION g Spoil Area The soil surveys that comprise your AOI were mapped at 1:15,800. o Stony Spot W Very Stony Spot Warning: Soil Map may not be valid at this scale. wet Spot Enlargement of maps beyond the scale of mapping can cause Other misunderstanding of the detail of mapping and accuracy of soil Special Line Features line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed Water Features scale. Streams and Canals Transportation Please rely on the bar scale on each map sheet for map �..ry Rails measurements. N Interstate Highways Source of Map: Natural Resources Conservation Service ti US Routes Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Major Roads Local Roads Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts Background distance and area. A projection that preserves area, such as the . Aerial Photography Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Albemarle County, Virginia Survey Area Data: Version 16, Aug 23, 2022 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: May 19, 2022—tut 1, 2022 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. 10 Custom Soil Resource Report Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 21 B Culpeper fine sandy loam, 2 to 3.1 24.7% 7 percent slopes 21C Culpeper fine sandy loam, 7 to 0.1 0.8% 15 percent slopes 22C3 Culpeper clay loam, 7 to 15 6.8 53.5% percent slopes, severely eroded 76 Dan River loam, 0 to 2 percent 2.0 15.7% slopes, occasionally flooded 83 Colvard fine sandy loam, 0 to 2 0.7 5.3% percent slopes, occasionally flooded Totals for Area of Interest 12.7 100.0% Map Unit Descriptions The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Other minor components, however, have properties and behavioral characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it 11 Custom Soil Resource Report was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or landform segments that have similar use and management requirements. The delineation of such segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, however, onsite investigation is needed to define and locate the soils and miscellaneous areas. An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Soils that have profiles that are almost alike make up a soil series. Except for differences in texture of the surface layer, all the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha -Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha -Beta association, 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example. iv Custom Soil Resource Report Albemarle County, Virginia 21 B—Culpeper fine sandy loam, 2 to 7 percent slopes Map Unit Setting National map unit symbol: kb8k Elevation: 390 to 1,050 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: All areas are prime farmland Map Unit Composition Culpeper and similar soils: 80 percent Estimates are based on observations, Description of Culpeper descriptions, and transects of the mapunit. Setting Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from meta-arkosic sandstone and quartzite Typical profile H1 - 0 to 8 inches: fine sandy loam H2 - 8 to 30 inches: clay H3 - 30 to 37 inches: sandy clay loam H4 - 37 to 45 inches: fine sandy loam H5 - 45 to 50 inches: bedrock H6 - 50 to 79 inches: bedrock Properties and qualities Slope: 2 to 7 percent Depth to restrictive feature: 40 to 79 inches to paralithic bedrock; 40 to 79 inches to lithic bedrock Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Very low to high (0.00 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water supply, 0 to 60 inches: Moderate (about 6.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 2e Hydrologic Soil Group: B Ecological site: F148XY024PA - Moist, Piedmont - felsic, Upland, Mixed Oak - Hardwood - Conifer Forest Hydric soil rating: No 13 Custom Soil Resource Report 21C—Culpeper fine sandy loam, 7 to 15 percent slopes Map Unit Setting National map unit symbol: kb8l Elevation: 340 to 1,210 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Farmland of statewide importance Map Unit Composition Culpeper and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Culpeper Setting Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from meta-arkosic sandstone and quartzite Typical profile H1 - 0 to 8 inches: fine sandy loam H2 - 8 to 30 inches: clay H3 - 30 to 37 inches: sandy clay loam H4 - 37 to 45 inches: fine sandy loam H5 - 45 to 50 inches: bedrock H6 - 50 to 79 inches: bedrock Properties and qualities Slope: 7 to 15 percent Depth to restrictive feature: 40 to 79 inches to paralithic bedrock; 40 to 79 inches to lithic bedrock Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Very low to high (0.00 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water supply, 0 to 60 inches: Moderate (about 6.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 3e Hydrologic Soil Group: B Ecological site: F148XY024PA - Moist, Piedmont - felsic, Upland, Mixed Oak - Hardwood - Conifer Forest 14 Custom Soil Resource Report Hydric soil rating: No 22C3—Culpeper clay loam, 7 to 15 percent slopes, severely eroded Map Unit Setting National map unit symbol: kb8n Elevation: 340 to 820 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Not prime farmland Map Unit Composition Culpeper and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Culpeper Setting Landform: Hillslopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from meta-arkosic sandstone and quartzite Typical profile H1 - 0 to 8 inches: clay loam H2 - 8 to 30 inches: clay H3 - 30 to 37 inches: sandy clay loam H4 - 37 to 45 inches: fine sandy loam H5 - 45 to 50 inches: bedrock H6 - 50 to 79 inches: bedrock Properties and qualities Slope: 7 to 15 percent Depth to restrictive feature: 40 to 79 inches to paralithic bedrock; 40 to 79 inches to lithic bedrock Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Very low to high (0.00 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water supply, 0 to 60 inches: Moderate (about 6.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4e Hydrologic Soil Group: B 15 Custom Soil Resource Report Ecological site: F148XY024PA - Moist, Piedmont - felsic, Upland, Mixed Oak - Hardwood - Conifer Forest Hydric soil rating: No 76—Dan River loam, 0 to 2 percent slopes, occasionally flooded Map Unit Setting National map unit symbol: 2v7jz Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Prime farmland if protected from flooding or not frequently flooded during the growing season Map Unit Composition Dan river, occasionally flooded, and similar soils: 75 percent Minor components: 5 percent Estimates are based on observations, descriptions, and transacts of the mapunit. Description of Dan River, Occasionally Flooded Setting Landform: Flood plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Alluvium derived from igneous rock Typical profile A - 0 to 12 inches: loam Bw - 12 to 35 inches: silt loam C - 35 to 79 inches: silt loam Properties and qualities Slope: 0 to 2 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Low Capacity of the most limiting layer to transmit water (Ksat) (0.57 to 1.98 in/hr) Depth to water table: About 36 to 60 inches Frequency of flooding: NoneOccasional Frequency of ponding: None Moderately high to high Available water supply, 0 to 60 inches: High (about 9.0 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 2w Hydrologic Soil Group: B Ecological site: F148XY027PA - Moist, Piedmont - felsic, Riparian Zone, Ecotonal Meadow -Shrub -Forest Hydric soil rating: No Custom Soil Resource Report Minor Components Hatboro, occasionally flooded Percent of map unit: 5 percent Landform: Flood plains Down -slope shape: Linear Across -slope shape: Linear Hydric soil rating: Yes 83—Colvard fine sandy loam, 0 to 2 percent slopes, occasionally flooded Map Unit Setting National map unit symbol: 2v7k4 Elevation: 360 to 1,540 feet Mean annual precipitation: 25 to 65 inches Mean annual air temperature: 54 to 59 degrees F Frost -free period: 195 to 231 days Farmland classification: Prime farmland if protected from flooding or not frequently flooded during the growing season Map Unit Composition Colvard, occasionally flooded, and similar soils: 85 percent Minor components: 3 percent Estimates are based on observations, descriptions, and transacts of the mapunit. Description of Colvard, Occasionally Flooded Setting Landform: Flood plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Alluvium derived from igneous rock Typical profile Ap - 0 to 9 inches: fine sandy loam C - 9 to 79 inches: sandy loam Properties and qualities Slope: 0 to 2 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Very low Capacity of the most limiting layer to transmit water (Ksat) in/hr) Depth to water table: About 36 to 60 inches Frequency of flooding: NoneOccasional Frequency of ponding: None High (1.98 to 5.95 Available water supply, 0 to 60 inches: Moderate (about 6.6 inches) IVA Custom Soil Resource Report Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 2w Hydrologic Soil Group: A Ecological site: F148XY027PA - Moist, Piedmont - felsic, Riparian Zone, Ecotonal Meadow -Shrub -Forest Hydric soil rating: No Minor Components Hatboro, occasionally flooded Percent of map unit: 3 percent Landform: Flood plains Down -slope shape: Linear Across -slope shape: Linear Hydric soil rating: Yes IF." References American Association of State Highway and Transportation Officials (AASHTO). 2004. Standard specifications for transportation materials and methods of sampling and testing. 24th edition. American Society for Testing and Materials (ASTM). 2005. Standard classification of soils for engineering purposes. ASTM Standard D2487-00. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of wetlands and deep -water habitats of the United States. U.S. Fish and Wildlife Service FWS/OBS-79/31. Federal Register. July 13, 1994. Changes in hydric soils of the United States. Federal Register. September 18, 2002. Hydric soils of the United States. Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric soils in the United States. National Research Council. 1995. Wetlands: Characteristics and boundaries. Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service. U.S. Department of Agriculture Handbook 18. http://www.nres.usda.govAvps/portal/ nres/deta i I/nations I/soi Is/?cid=n res 142p2_054262 Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service, U.S. Department of Agriculture Handbook 436. http:// www. nres.usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053577 Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of Agriculture, Natural Resources Conservation Service. http:// www. nres.usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053580 Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and Delaware Department of Natural Resources and Environmental Control, Wetlands Section. United States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of Engineers wetlands delineation manual. Waterways Experiment Station Technical Report Y-87-1. United States Department of Agriculture, Natural Resources Conservation Service. National forestry manual. http://www.nres.usda.gov/wps/portal/nres/detail/soils/ home/?cid=nres 142 p2_053374 United States Department of Agriculture, Natural Resources Conservation Service. National range and pasture handbook. http://www.nres.usda.gov/wps/portal/nres/ detail/national/landuse/rangepasture/?cid=stelprd b1043084 19 Custom Soil Resource Report United States Department of Agriculture, Natural Resources Conservation Service. National soil survey handbook, title 430-VI. http://www.nres.usda.gov/wps/portal/ nres/detail/soils/scientists/?cid=nres 142p2_054242 United States Department of Agriculture, Natural Resources Conservation Service. 2006. Land resource regions and major land resource areas of the United States, the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook 296. hftp://www.nres.usda.gov/wps/portal/nres/detail/national/soils/? cid=n res 142p2_053624 United States Department of Agriculture, Soil Conservation Service. 1961. Land capability classification. U.S. Department of Agriculture Handbook 210. http:// www.nrcs.usda.gov/lnternet/FSE—DOCUMENTS/nrcsl42p2_052290.pdf 20 4/323, 8:23 AM Precipitation Frequency Data Server NOAA Atlas 14, Volume 2, Version 3 Location name: Charlottesville, Virginia, USA* d¢r `" Latitude: 38.0252o, Longitude:-78.4903o Elevation: mlft** � 'source: ESRI Maps source: USGS POINT PRECIPITATION FREQUENCY ESTIMATES G.M. Bonin, D. Martin, B. Lin, T. Parzybok, M.Yekta, and D. Riley NOAA, National Weather Service, Silver Spring, Maryland PF tabular I PF_graphical I Maps & aerials PF tabular PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)' Average recurrence interval (years) Duration ��� 10 26 501 100 200 500 1000 6-min (0.318-0392) (0.3079-0.466) (0.443-0.546) (04 97--0 613) (0.557--0 687) (0.603-0746) (0.644-0.91) (0.681-0853) (07 23-0.918) (0.756-0 972) 10-min (0.50 -066) (0.606-0. 46) (0.7110-0874) (07 95-0.980) (0.888-1310) (0.960-11.19) (1.02127) (1.08-21335) (1: 41.45) 1 (1: 9-�53) 1.73 15-min (0.6340783) (0.762-0.938) (0. 98-1711) (1.00.?24) (113-21639) (1.22-3t51) (1.29-11..61) (1.6--11..71) (1.44i83) (14 91.92) 30-min (0. 69-11.07) 1 (1.05-1.30) 1 (1.2Az57) 1 (1.46- .80) 1 (1.67-2606) (1.83227) (1.98-2.47) (2. 2-2'8) 1 (22 9-2.91) (2. 2-3.11) 1.20 1. � 60-min (1.08-1.34) (1.32-1.63) (1.642.01) 0- (1.2.34) (2.22-2.74) (2..07) 93 (2. 3 a9) (2.97-3.73) 1 (32 9-4.17) (3. 3-4.54) 2-hr (1.27-1.86) (1.54-2.0) (1.922.50) (22 6528) (2. 83.48) (3.023.95) (3. 6�42) (3.71�91) (418-5.60) (4. 6-6.19) 3-hr (1.39-1.83) (1.68-2.21) (2.01�76) (2.45-3.23) (2.913.84) (3. 84.34) (3. 6�87) (4.045.43) (4: 5-6.19) (4.97-6.85) 6-hr (17 9- 29) (215-2.77) (2.67-3.43) (3134.04) (37 44.84) 1 (4. 55.54) (a. 8-6.28) (5.6-7908) (6.09-8.22) (67 49.23) 51 11.3 12-hr (22 45.92) (2.7313751) (3.64.38) (3.975317) (4. 9527) (5. 9--37825) (6. 3 8331) (7.01 9647) (8.11411.2) (9.11-12.8) 24hr (27 3-341) (3.31�13) 4.70 (4.2-5.27) (4.97--r�6.2) (6.07-17461) 7.93 (6.0-8.80) (7. 8-10.1) (9.0511.6) (10.6- 3.8) (11.9-15.7) 13 2-day (3.24901) (3. 04586) (4.958.18) (5.81--725) (7.028.81) (8.0110.1) (9.07--- 1.5) (102- 3.1) (11.8-15.4) (1315167A) 5.88 4.7 3-day (3.47423) (4. 05312) (53 38.51) (6.25-7264) (7.5 928) (8.840.6) (97 6- 2.1) (11.0-13.8) (127- 6.2) (141618.2) �� (3.72445) (4. 05739) (5.761-6.84) (66 9-8.02) (8. 09074) (9.24121.2) (10b- 2.8) (11.8-14.5) (13.6-17.0) (15.11- 9.1) 187 T-0ey (4.33-5.12) (5. 2-6.17) (6.51-67..72) (7.57858) (905-10.8) (10.3- 2.3) (11.5- 3.9) (129-15.7) (1476- 8.3) (16.3- 0.5) 10-dey (4.93-54.76) (59 3-692) (7.318.54) (8.429.6) (9.97--11.7) (112?13.2) (125-14.9) (138- 6.6) (157- 9.1) 9.4 (i7.2-21.1) 48 178 1-5 20-dey (6.57-07A9) (7.848.94) (9.46-10.8) (107- 2.2) (12.414.2) (137- 5.8) (151617.4) (16.4-9.1) (18.11--21.3) 1 (19.5- 3.2) 30-0ey (810.9.14) (9.611'- 0.8) (11.412.8) (127--14.3) (14.416.3) (15.6-17.8) (16.9-19.2) (18.11- 0.7) (19.6- 2.7) (20?8-24.2) 46-day (10.10- 1.4) (12.0. 3.4) (14.10-15.7) (15.FWA) (17419.5) (188021.2) (20212.7) (21424.3) (230. 6.3) (2421627.8) 60-day ' ? 6 27 ? (119-13.3) . (141 5.6) (162 -18.0) (178- 9.8) (1982.1) (2133.8) (-725.5) (24027.0) (2570.1) (268- 0.5) 1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS). Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values. Please refer to NOAAAtias 14 document for more information. Back to Top PF graphical hftps://hdsc.nws.noaa.govlhdsctpfds/pfds_Printpage.html?lat=38.0252&Ion=-78.4903&data=depth&units=english&series=pds 1/4 4/3123, 8:23 AM Precipitation Frequency Data Server PDS-based depth -duration -frequency (DDF) curves Latitude: 38.0252°,Longitude: -78.49030 Lim 25 c L 20 y 10 a c j 104 C C T TT T T T T TT E _ E t t L L A A A N re r0 r0 re N c r A 6 vo a rE .. 'Eh : : rYi $ Duration 31 IF t 21 I Average recurrence interval (years) NOAA Atlas 14, Volume 2, Version 3 Created (GMT): Mon Apr 3 12:22:54 2023 Back to Top Maps & aerials Small scale terrain Average recurrence rntenal (years) — 1 2 — 5 10 25 60 100 200 — Soo 1000 Duration 5-min — 2-day — 10-mm — 3-day 15- mrn — 4-day — 30-min — 7-day — 60inrn — 10-0ay — 2-hr — 20-day — 3-hr — 30-day — 6-hr — 45-day — 12-hr — 60-day — 24fir hftps://hdsc.nws.noaa.govlhdsc/pfds/pfds_printpage.html?lat=38.0252&Ion=-78.4903&data=depth&units=english&series=pds 214 4/3123, 8:23 AM Precipitation Frequency Data Server OCharlottesvilIe = ca rExs� I Pr AR111111rW� 3km 41N 1 ` 2mi � Large scale terrain �. Shington, D.C.0 Harrisonburg. 5 taunton VIRGINIA [4 I Rich + :burl, Anannkw '�1 100km � r r 60mi C N or fol Large scale map Ani � W� o 'ton ° Harrisonburg blorinlsn - inns I Ri ch nxm Lynchburg' ..Roanoke831acksburg r 100km �I / NoriI 60mi // Large scale aerial hftps://hdsc.nws.noaa.govlhdsc/pfds/pfds_printpage.html?lat=38.0252&Ion=-78.4903&data=depth&units=english&series=pds 314 4/3123, 8:23 AM Precipitation Frequency Data Server Back to Top US Department of Commerce National Oceanic and Atmospheric Administration National Weather Service National Water Center 1325 East West Highway Silver Spring, MD 20910 Questions?: HDSC.Questions(c Inoa".ov Disclaimer hftps://hdsc.nws.noaa.govlhdsc/pfds/pfds_printpage.html?lat=38.0252&Ion=-78.4903&data=depth&units=english&series=pds 414