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WPO202300008 Calculations 2023-02-07
Boar's Head Sports Club Pool Renovation ALBEMARLE COUNTY, VIRGINIA DESIGN CALCULATIONS & NARRATIVE FEBRUARY 6, 2023 TIMMONS GROUP YOUR VISION ACHIEVED THROUGH OURS. Prepared by: Jonathan Showalter, PE Timmons Group 608 Preston Avenue, Suite 200 Charlottesville, VA 22903 434.327.1681 O� 2 ox.ATHA\ X SHON:ILTER 9 Lic. No. 0402057151 ���sS�r)11' Table of Contents Section Title Page number Project Narrative 2 Pre and Post Developed HydroCAD Calculations Virginia Runoff Reduction Method Worksheet 351 4 LD-229 Pipe Calculations 353 NRCS Web Soil Survey Map MTH 6 NOAA Atlas 14 — Precipitation Frequency Estimate Table 377 Proiect Narrative: The project includes renovations to the existing pools and pool deck at the Sports Club in the Boar's Head Resort Complex. Improvements will include removing and replacing the existing 3 pools, replacing the existing pool deck, and minor adjustments to the existing grade and associated utilities. The limits of disturbance is 1.08 acres. The existing pool deck area is surrounded to the west and south by a retention wall. All of the pool deck area is captured by existing storm inlets and discharge the site runoff into the existing stormwater pond located on the north side of Wellington Drive. In the proposed conditions, the stormwater pipes will be removed upstream of the retaining wall. A portion of the disturbance by passes the pond and flows to the west across the parking lot, down an embankment and into another stormwater pond. Water Ouality: The current site has 0.60 acres of impervious area within the limits of disturbance and 0.48 acres of managed turf. In the post developed conditions there is 0.84 acres of impervious area and 0.24 acres of pervious cover. The existing and proposed pool surface was considered to be impervious cover for the pre -developed and post developed conditions. The limits of disturbance was analyzed for water quality and will require 0.70 lb./year of nutrient credit. This requirement will be satisfied through the purchase of offsite nutrient credits from a local nutrient credit bank. Water Ouantity The existing conditions within the limits of disturbance is a mix between impervious cover and pervious cover. In the existing conditions there are three separate pools with a surrounding pool deck and associated pool items. The majority of the disturbed area will be captured by the proposed storm sewer system and be conveyed to the existing pond located north of the site. The proposed system will tie into the existing storm system upstream of the existing retaining wall. Due to the minimal slope on the existing storm pipe under Wellington Drive, this pipe will be replaced to provide adequate capacity for the post developed conditions. This pipe will then discharge into the existing pond with a riprap outfall. Based on the proposed calculations the pipe system provides adequate conveyance for the 2 and 10 year storm to discharge into the pond without erosion or flooding satisfying the 9VAC25-870-66B. IA and 9VAC25-870-66.C.1 without the need for detention. The total drainage area to the pond is approximately 173 acres. Since the limits of disturbance is less than 1% of the total drainage area to the pond, the required limits of analysis is the outfall of the updated pipe that goes under Wellington Lane per 9VAC25-870-66.B.4.A and 9VAC25-870-66.C.3A. Runoff not captured by the proposed storm sewer system on the pool deck, sheet flows off site to the west across the existing drive aisle and parking lot, down an embankment and into another pond located to the west of improvements. Due to the decrease in drainage area, energy balance is met satisfying 9VAC-970-66.13 stormwater requirement for channel protection. Due to the decrease in area, the 10-year flow in the post developed is less than the predeveloped 10-year flow satisfying 9VAC-970966.0 stormwater requirement for flood protection. 1S 48 2S 6S PRE DEV AREA OF PRE DEV AREA TO POST DEV AREA OF POST DEV AREA TO ANALYSIS 1 THE SOUTH ANALYSIS 1 THE SOUTH Subcat Reach OD Link Routing Diagram for PRE —POST CALCS Prepared by Timmons Group, Printed 2/6/2023 FHydroCAD@ 10.10-7a S/n 08663 © 2021 HydroCAD Software Solutions LLC PRE POST CALCS Prepared by Timmons Rainfall Events Listing Printed 2/6/2023 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 3.04 2 2 2-YEAR Type II 24-hr Default 24.00 1 3.68 2 3 10-YEAR Type II 24-hr Default 24.00 1 5.56 2 4 100-YEAR Type II 24-hr Default 24.00 1 9.12 2 PRE POST CALCS Prepared by Timmons Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 0.120 98 (4S, 6S) 0.800 61 >75% Grass cover, Good, HSG B (1S, 2S, 4S, 6S) 1.010 98 Paved parking, HSG B (1S, 2S) 0.330 98 Water Surface, HSG B (1 S, 2S) 2.260 85 TOTAL AREA Printed 2/6/2023 PRE POST CALCS Prepared by Timmons Area Soil Soil Listing (all nodes) Subcatchment (acres) Group Numbers 0.000 HSG A 2.140 HSG B 1S, 2S, 4S, 6S 0.000 HSG C 0.000 HSG D 0.120 Other 4S, 6S 2.260 TOTAL AREA Printed 2/6/2023 PRE POST CALCS Prepared by Timmons Printed 2/6/2023 Panes ri Ground Covers (all nodes) HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 0.000 0.000 0.000 0.120 0.120 4S, 6S 0.000 0.800 0.000 0.000 0.000 0.800 >75% Grass cover, Good 1S, 2S, 4S, 6S 0.000 1.010 0.000 0.000 0.000 1.010 Paved parking 1S, 2S 0.000 0.330 0.000 0.000 0.000 0.330 Water Surface 1S, 2S 0.000 2.140 0.000 0.000 0.120 2.260 TOTAL AREA PRE _POST CALCS Type/1 24-hr 1-YEAR Rainfall=3.04" Prepared by Timmons Group Printed 2/6/2023 HydroCAD® 10.10-7a s/n 08663 © 2021 HydroCAD Software Solutions LLC Page 6 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method SubcatchmentlS: PRE DEV AREAOF Runoff Area=1.010 ac 51.49% Impervious Runoff Depth>1.17" Tc=0.0 min CN=80 Runoff=2.67 cfs 0.099 of Subcatchment2S: POST DEV AREA OF Runoff Area=1.010 ac 81.19% Impervious Runoff Depth>1.97" Tc=6.0 min CN=91 Runoff=3.54 cfs 0.166 of Subcatchment4S: PRE DEV AREA TO THE Runoff Area=0.150 ac 60.00% Impervious Runoff Depth>1.36" Tc=6.0 min CN=83 Runoff=0.38 cfs 0.017 of Subcatchment6S: POST DEV AREATO Runoff Area=0.090 ac 33.33% Impervious Runoff Depth>0.79" Tc=6.0 min CN=73 Runoff=0.14 cfs 0.006 of Total Runoff Area = 2.260 ac Runoff Volume = 0.287 of Average Runoff Depth = 1.53" 35.40% Pervious = 0.800 ac 64.60% Impervious = 1.460 ac PRE POST CALCS Prepared by Timmons Type/1 24-hr 1-YEAR Rainfall=3.04" Printed 2/6/2023 Summary for Subcatchment 1S: PRE DEV AREA OF ANALYSIS 1 Runoff = 2.67 cfs @ 11.89 hrs, Volume= 0.099 af, Depth> 1.17" 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=3.04" Area (ac) CN Descriotion 0.380 98 Paved parking, HSG B 0.140 98 Water Surface, HSG B 0.490 61 >75% Grass cover, Good, HSG B 1.010 80 Weighted Average 0.490 48.51 % Pervious Area 0.520 51.49% Impervious Area Subcatchment 1S: PRE DEV AREA OF ANALYSIS 1 Hydrograph ❑ Runoff 267 Type II 24-hr 1-YEAR Rainfall=3.04" Runoff Area=1.010 ac Runoff Volume=0.099 of Runoff Depth>1.17" 0 Tc=0.0 min CN=80 Time (hours) PRE POST CALCS Prepared by Timmons Type/1 24-hr 1-YEAR Rainfall=3.04" Printed 2/6/2023 Hydrograph for Subcatchment 1S: PRE DEV AREA OF ANALYSIS 1 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 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 0.33 0.00 0.00 7.75 0.35 0.00 0.00 8.00 0.36 0.00 0.00 8.25 0.38 0.00 0.00 8.50 0.40 0.00 0.00 8.75 0.42 0.00 0.00 9.00 0.45 0.00 0.00 9.25 0.47 0.00 0.00 9.50 0.50 0.00 0.00 9.75 0.52 0.00 0.00 10.00 0.55 0.00 0.00 10.25 0.58 0.00 0.01 10.50 0.62 0.01 0.01 10.75 0.66 0.01 0.02 11.00 0.71 0.02 0.03 11.25 0.78 0.03 0.06 11.50 0.86 0.05 0.10 11.75 1.18 0.14 0.87 12.00 2.02 0.57 0.55 12.25 2.15 0.65 0.28 12.50 2.23 0.71 0.18 12.75 2.30 0.75 0.15 13.00 2.35 0.78 0.13 13.25 2.39 0.81 0.11 13.50 2.43 0.84 0.10 13.75 2.46 0.86 0.09 14.00 2.49 0.88 0.08 14.25 2.52 0.90 0.08 14.50 2.55 0.92 0.07 14.75 2.57 0.94 0.07 15.00 2.59 0.95 0.07 15.25 2.62 0.97 0.06 15.50 2.64 0.99 0.06 15.75 2.66 1.00 0.05 16.00 2.68 1.01 0.05 16.25 2.69 1.02 0.05 16.50 2.71 1.04 0.05 16.75 2.73 1.05 0.05 17.00 2.74 1.06 0.05 17.25 2.76 1.07 0.04 17.50 2.77 1.08 0.04 17.75 2.79 1.09 0.04 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 2.80 1.10 0.04 18.25 2.81 1.11 0.04 18.50 2.83 1.12 0.04 18.75 2.84 1.13 0.04 19.00 2.85 1.14 0.04 19.25 2.86 1.15 0.03 19.50 2.87 1.16 0.03 19.75 2.88 1.16 0.03 20.00 2.89 1.17 0.03 PRE POST CALCS Prepared by Timmons Type/1 24-hr 1-YEAR Rainfall=3.04" Printed 2/6/2023 Summary for Subcatchment 2S: POST DEV AREA OF ANALYSIS 1 Runoff = 3.54 cfs @ 11.97 hrs, Volume= 0.166 af, Depth> 1.97" 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=3.04" Area (ac) CN Description 0.630 98 Paved parking, HSG B 0.190 98 Water Surface, HSG B 0.190 61 >75% Grass cover, Good, HSG B 1.010 91 Weighted Average 0.190 18.81 % Pervious Area 0.820 81.19% Impervious Area Tc Length Capacity Description Direct Entry, Subcatchment 2S: POST DEV AREA OF ANALYSIS 1 Hydrograph ❑ Runoff 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=3.04" Runoff Area=1.010 ac (Runoff Volume=0.166 of Runoff Depth>1.97" Tc=6.0 min CN=91 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) PRE POST CALCS Prepared by Timmons Type/1 24-hr 1-YEAR Rainfall=3.04" Printed 2/6/2023 Hydrograph for Subcatchment 2S: POST DEV AREA OF ANALYSIS 1 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 0.00 0.00 6.25 0.26 0.00 0.01 6.50 0.27 0.01 0.01 6.75 0.29 0.01 0.01 7.00 0.30 0.01 0.01 7.25 0.32 0.01 0.01 7.50 0.33 0.02 0.01 7.75 0.35 0.02 0.02 8.00 0.36 0.02 0.02 8.25 0.38 0.03 0.02 8.50 0.40 0.03 0.02 8.75 0.42 0.04 0.03 9.00 0.45 0.05 0.03 9.25 0.47 0.06 0.04 9.50 0.50 0.07 0.04 9.75 0.52 0.08 0.05 10.00 0.55 0.09 0.05 10.25 0.58 0.11 0.06 10.50 0.62 0.13 0.08 10.75 0.66 0.15 0.10 11.00 0.71 0.18 0.12 11.25 0.78 0.21 0.16 11.50 0.86 0.27 0.22 11.75 1.18 0.49 1.07 12.00 2.02 1.18 3.33 12.25 2.15 1.29 0.46 12.50 2.23 1.37 0.30 12.75 2.30 1.43 0.22 13.00 2.35 1.47 0.18 13.25 2.39 1.51 0.16 13.50 2.43 1.55 0.14 13.75 2.46 1.58 0.12 14.00 2.49 1.60 0.11 14.25 2.52 1.63 0.10 14.50 2.55 1.65 0.10 14.75 2.57 1.68 0.09 15.00 2.59 1.70 0.09 15.25 2.62 1.72 0.08 15.50 2.64 1.74 0.08 15.75 2.66 1.75 0.07 16.00 2.68 1.77 0.07 16.25 2.69 1.79 0.06 16.50 2.71 1.80 0.06 16.75 2.73 1.82 0.06 17.00 2.74 1.83 0.06 17.25 2.76 1.85 0.06 17.50 2.77 1.86 0.06 17.75 2.79 1.87 0.05 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 2.80 1.89 0.05 18.25 2.81 1.90 0.05 18.50 2.83 1.91 0.05 18.75 2.84 1.92 0.05 19.00 2.85 1.93 0.05 19.25 2.86 1.94 0.04 19.50 2.87 1.95 0.04 19.75 2.88 1.96 0.04 20.00 2.89 1.97 0.04 PRE POST CALCS Prepared by Timmons Type/1 24-hr 1-YEAR Rainfall=3.04" Printed 2/6/2023 Summary for Subcatchment 4S: PRE DEV AREA TO THE SOUTH Runoff = 0.38 cfs @ 11.97 hrs, Volume= 0.017 af, Depth> 1.36" 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=3.04" Area (ac) CN Description 0.090 98 0.060 61 >75% Grass cover, Good, HSG B 0.150 83 Weighted Average 0.060 40.00% Pervious Area 0.090 60.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 4S: PRE DEV AREA TO THE SOUTH Hydrograph 0.42 ---`----`---`----`---`----`---____`-------`-------`-------- I L--- 38 0.38 __y____r___y____,___y__ __r____I____r____I_S 34iht 0.36 0.34 I ' __r____r___r____r___r__ ---------------------------- i� --1.XEAR Ralnfailr�Q4"- --Rundff �V�V.0150a - I I I I I I y` RuFloff �"me 0.26 __-____-___---- I_ .01�ra 0.24 — 'I -----Runoff De th�1:36" o.zz 0 0.2-------L-------L-------�- E ---- --- ---- ------ ----------i---�--- Tic=fs+O -Min- 0.18 ---`----`---`---- ------ --- 4---- 1---- 1 ---- I---- }---- I ---- } --- 0.14, 0.12 ---I-------- ----L ---�--- ----1 I ----I---- 0.06.I 0.04 _� _� _� -------- -r 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoff PRE POST CALCS Prepared by Timmons Type/1 24-hr 1-YEAR Rainfall=3.04" Printed 2/6/2023 Hydrograph for Subcatchment 4S: PRE DEV AREA TO THE SOUTH Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 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 0.33 0.00 0.00 7.75 0.35 0.00 0.00 8.00 0.36 0.00 0.00 8.25 0.38 0.00 0.00 8.50 0.40 0.00 0.00 8.75 0.42 0.00 0.00 9.00 0.45 0.00 0.00 9.25 0.47 0.00 0.00 9.50 0.50 0.00 0.00 9.75 0.52 0.01 0.00 10.00 0.55 0.01 0.00 10.25 0.58 0.01 0.00 10.50 0.62 0.02 0.00 10.75 0.66 0.03 0.01 11.00 0.71 0.04 0.01 11.25 0.78 0.06 0.01 11.50 0.86 0.08 0.02 11.75 1.18 0.21 0.09 12.00 2.02 0.71 0.37 12.25 2.15 0.80 0.05 12.50 2.23 0.86 0.04 12.75 2.30 0.90 0.03 13.00 2.35 0.94 0.02 13.25 2.39 0.97 0.02 13.50 2.43 1.00 0.02 13.75 2.46 1.03 0.02 14.00 2.49 1.05 0.01 14.25 2.52 1.07 0.01 14.50 2.55 1.09 0.01 14.75 2.57 1.11 0.01 15.00 2.59 1.13 0.01 15.25 2.62 1.14 0.01 15.50 2.64 1.16 0.01 15.75 2.66 1.18 0.01 16.00 2.68 1.19 0.01 16.25 2.69 1.20 0.01 16.50 2.71 1.22 0.01 16.75 2.73 1.23 0.01 17.00 2.74 1.24 0.01 17.25 2.76 1.25 0.01 17.50 2.77 1.26 0.01 17.75 2.79 1.28 0.01 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 2.80 1.29 0.01 18.25 2.81 1.30 0.01 18.50 2.83 1.31 0.01 18.75 2.84 1.32 0.01 19.00 2.85 1.33 0.01 19.25 2.86 1.34 0.01 19.50 2.87 1.35 0.01 19.75 2.88 1.35 0.01 20.00 2.89 1.36 0.00 PRE POST CALCS Prepared by Timmons Type/1 24-hr 1-YEAR Rainfall=3.04" Printed 2/6/2023 Summary for Subcatchment 6S: POST DEV AREA TO THE SOUTH Runoff = 0.14 cfs @ 11.98 hrs, Volume= 0.006 af, Depth> 0.79" 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=3.04" Area (ac) CN Description ' 0.030 98 0.060 61 >75% Grass cover, Good, HSG B 0.090 73 Weighted Average 0.060 66.67% Pervious Area 0.030 33.33% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 6S: POST DEV AREA TO THE SOUTH Hydrograph 0.15 ------------------------- 014 0.13 i i i i I i 0 12 0.08 g 0.07 0.06 O.W. i 0.04 I I I I I i 0.03 0.02 I ------------------------------ t--- TYpe-"-Z4Lhr 1;YEAR RainfallT3.Q4'1_ --.----7------ ---7--------7--- --R-Wnbff-Afea1=Q 09Q ac- Ru rroffVo l'prrre=O: pOG-at ___III_Runof Deth_$0.9"_ I -- r----I ---- I I -- -- �c= -m I I I I I in- I CAN=73 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 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoff PRE POST CALCS Prepared by Timmons Type/1 24-hr 1-YEAR Rainfall=3.04" Printed 2/6/2023 Hydrograph for Subcatchment 6S: POST DEV AREA TO THE SOUTH Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 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 0.33 0.00 0.00 7.75 0.35 0.00 0.00 8.00 0.36 0.00 0.00 8.25 0.38 0.00 0.00 8.50 0.40 0.00 0.00 8.75 0.42 0.00 0.00 9.00 0.45 0.00 0.00 9.25 0.47 0.00 0.00 9.50 0.50 0.00 0.00 9.75 0.52 0.00 0.00 10.00 0.55 0.00 0.00 10.25 0.58 0.00 0.00 10.50 0.62 0.00 0.00 10.75 0.66 0.00 0.00 11.00 0.71 0.00 0.00 11.25 0.78 0.00 0.00 11.50 0.86 0.00 0.00 11.75 1.18 0.05 0.02 12.00 2.02 0.33 0.13 12.25 2.15 0.39 0.02 12.50 2.23 0.43 0.01 12.75 2.30 0.46 0.01 13.00 2.35 0.49 0.01 13.25 2.39 0.51 0.01 13.50 2.43 0.53 0.01 13.75 2.46 0.55 0.01 14.00 2.49 0.56 0.01 14.25 2.52 0.58 0.01 14.50 2.55 0.59 0.01 14.75 2.57 0.61 0.00 15.00 2.59 0.62 0.00 15.25 2.62 0.63 0.00 15.50 2.64 0.64 0.00 15.75 2.66 0.65 0.00 16.00 2.68 0.66 0.00 16.25 2.69 0.67 0.00 16.50 2.71 0.68 0.00 16.75 2.73 0.69 0.00 17.00 2.74 0.70 0.00 17.25 2.76 0.71 0.00 17.50 2.77 0.72 0.00 17.75 2.79 0.73 0.00 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 2.80 0.74 0.00 18.25 2.81 0.74 0.00 18.50 2.83 0.75 0.00 18.75 2.84 0.76 0.00 19.00 2.85 0.77 0.00 19.25 2.86 0.77 0.00 19.50 2.87 0.78 0.00 19.75 2.88 0.79 0.00 20.00 2.89 0.79 0.00 PRE _POST CALCS Type/1 24-hr 2-YEAR Rainfall=3.68" Prepared by Timmons Group Printed 2/6/2023 HydroCAD® 10.10-7a s/n 08663 © 2021 HydroCAD Software Solutions LLC Page 15 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method SubcatchmentlS: PRE DEV AREAOF Runoff Area=1.010 ac 51.49% Impervious Runoff Depth>1.64" Tc=0.0 min CN=80 Runoff=3.69 cfs 0.138 of Subcatchment2S: POST DEV AREA OF Runoff Area=1.010 ac 81.19% Impervious Runoff Depth>2.54" Tc=6.0 min CN=91 Runoff=4.49 cfs 0.214 of Subcatchment4S: PRE DEV AREA TO THE Runoff Area=0.150 ac 60.00% Impervious Runoff Depth>1.86" Tc=6.0 min CN=83 Runoff=0.52 cfs 0.023 of Subcatchment6S: POST DEV AREATO Runoff Area=0.090 ac 33.33% Impervious Runoff Depth>1.18" Tc=6.0 min CN=73 Runoff=0.20 cfs 0.009 of Total Runoff Area = 2.260 ac Runoff Volume = 0.384 of Average Runoff Depth = 2.04" 35.40% Pervious = 0.800 ac 64.60% Impervious = 1.460 ac PRE POST CALCS Prepared by Timmons Type/1 24-hr 2-YEAR Rainfall=3.68" Printed 2/6/2023 Summary for Subcatchment 1S: PRE DEV AREA OF ANALYSIS 1 Runoff = 3.69 cfs @ 11.89 hrs, Volume= 0.138 af, Depth> 1.64" 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 2-YEAR Rainfall=3.68" Area (ac) CN Descriotion 0.380 98 Paved parking, HSG B 0.140 98 Water Surface, HSG B 0.490 61 >75% Grass cover, Good, HSG B 1.010 80 Weighted Average 0.490 48.51 % Pervious Area 0.520 51.49% Impervious Area Subcatchment 1S: PRE DEV AREA OF ANALYSIS 1 Hydrograph 4 ❑Runoff 3 fi9 cfs Type II 24-hr 2-YEAR Rainfall=3.68" 3 Runoff Area=1.010 ac Runoff Volume=0.138 of Runoff Depth>1.64" z Tc=0.0 min CN=80 Time (hours) PRE POST CALCS Prepared by Timmons Type/1 24-hr 2-YEAR Rainfall=3.68" Printed 2/6/2023 Hydrograph for Subcatchment 1S: PRE DEV AREA OF ANALYSIS 1 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.23 0.00 0.00 5.25 0.25 0.00 0.00 5.50 0.26 0.00 0.00 5.75 0.28 0.00 0.00 6.00 0.29 0.00 0.00 6.25 0.31 0.00 0.00 6.50 0.33 0.00 0.00 6.75 0.35 0.00 0.00 7.00 0.36 0.00 0.00 7.25 0.38 0.00 0.00 7.50 0.40 0.00 0.00 7.75 0.42 0.00 0.00 8.00 0.44 0.00 0.00 8.25 0.46 0.00 0.00 8.50 0.49 0.00 0.00 8.75 0.51 0.00 0.00 9.00 0.54 0.00 0.00 9.25 0.57 0.00 0.01 9.50 0.60 0.00 0.01 9.75 0.63 0.01 0.01 10.00 0.67 0.01 0.02 10.25 0.71 0.02 0.03 10.50 0.75 0.02 0.03 10.75 0.80 0.03 0.05 11.00 0.86 0.05 0.06 11.25 0.94 0.07 0.10 11.50 1.04 0.10 0.16 11.75 1.42 0.25 1.29 12.00 2.44 0.85 0.75 12.25 2.60 0.96 0.38 12.50 2.70 1.03 0.24 12.75 2.78 1.09 0.20 13.00 2.84 1.13 0.17 13.25 2.89 1.17 0.15 13.50 2.94 1.21 0.13 13.75 2.98 1.24 0.12 14.00 3.02 1.26 0.10 14.25 3.05 1.29 0.10 14.50 3.08 1.31 0.10 14.75 3.11 1.33 0.09 15.00 3.14 1.36 0.09 15.25 3.17 1.38 0.08 15.50 3.19 1.40 0.08 15.75 3.22 1.41 0.07 16.00 3.24 1.43 0.07 16.25 3.26 1.45 0.06 16.50 3.28 1.46 0.06 16.75 3.30 1.48 0.06 17.00 3.32 1.49 0.06 17.25 3.34 1.51 0.06 17.50 3.36 1.52 0.06 17.75 3.37 1.54 0.05 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 3.39 1.55 0.05 18.25 3.41 1.56 0.05 18.50 3.42 1.57 0.05 18.75 3.44 1.59 0.05 19.00 3.45 1.60 0.05 19.25 3.46 1.61 0.04 19.50 3.48 1.62 0.04 19.75 3.49 1.63 0.04 20.00 3.50 1.64 0.04 PRE POST CALCS Prepared by Timmons Type/1 24-hr 2-YEAR Rainfall=3.68" Printed 2/6/2023 Summary for Subcatchment 2S: POST DEV AREA OF ANALYSIS 1 Runoff = 4.49 cfs @ 11.97 hrs, Volume= 0.214 af, Depth> 2.54" 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 2-YEAR Rainfall=3.68" Area (ac) CN Description 0.630 98 Paved parking, HSG B 0.190 98 Water Surface, HSG B 0.190 61 >75% Grass cover, Good, HSG B 1.010 91 Weighted Average 0.190 18.81 % Pervious Area 0.820 81.19% Impervious Area Tc Length Capacity Description Direct Entry, Subcatchment 2S: POST DEV AREA OF ANALYSIS 1 Hydrograph ❑ Runoff Type II 24-hr 2-YEAR Rainfall=3.68" Runoff Area=1.010 ac Runoff Volume=0.214 of Runoff Depth>2.54" Tc=6.0 min CN=91 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) PRE POST CALCS Prepared by Timmons Type/1 24-hr 2-YEAR Rainfall=3.68" Printed 2/6/2023 Hydrograph for Subcatchment 2S: POST DEV AREA OF ANALYSIS 1 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.23 0.00 0.00 5.25 0.25 0.00 0.01 5.50 0.26 0.00 0.01 5.75 0.28 0.01 0.01 6.00 0.29 0.01 0.01 6.25 0.31 0.01 0.01 6.50 0.33 0.02 0.01 6.75 0.35 0.02 0.02 7.00 0.36 0.02 0.02 7.25 0.38 0.03 0.02 7.50 0.40 0.03 0.02 7.75 0.42 0.04 0.03 8.00 0.44 0.05 0.03 8.25 0.46 0.06 0.03 8.50 0.49 0.07 0.04 8.75 0.51 0.08 0.04 9.00 0.54 0.09 0.05 9.25 0.57 0.10 0.06 9.50 0.60 0.12 0.06 9.75 0.63 0.13 0.07 10.00 0.67 0.15 0.08 10.25 0.71 0.17 0.09 10.50 0.75 0.20 0.11 10.75 0.80 0.23 0.13 11.00 0.86 0.27 0.16 11.25 0.94 0.32 0.22 11.50 1.04 0.39 0.29 11.75 1.42 0.68 1.41 12.00 2.44 1.56 4.20 12.25 2.60 1.70 0.58 12.50 2.70 1.80 0.37 12.75 2.78 1.87 0.27 13.00 2.84 1.92 0.23 13.25 2.89 1.97 0.20 13.50 2.94 2.02 0.17 13.75 2.98 2.05 0.15 14.00 3.02 2.09 0.14 14.25 3.05 2.12 0.13 14.50 3.08 2.15 0.12 14.75 3.11 2.18 0.11 15.00 3.14 2.20 0.11 15.25 3.17 2.23 0.10 15.50 3.19 2.25 0.10 15.75 3.22 2.27 0.09 16.00 3.24 2.29 0.08 16.25 3.26 2.31 0.08 16.50 3.28 2.33 0.08 16.75 3.30 2.35 0.08 17.00 3.32 2.37 0.07 17.25 3.34 2.39 0.07 17.50 3.36 2.40 0.07 17.75 3.37 2.42 0.07 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 3.39 2.44 0.06 18.25 3.41 2.45 0.06 18.50 3.42 2.47 0.06 18.75 3.44 2.48 0.06 19.00 3.45 2.49 0.06 19.25 3.46 2.51 0.05 19.50 3.48 2.52 0.05 19.75 3.49 2.53 0.05 20.00 3.50 2.54 0.05 PRE POST CALCS Prepared by Timmons Type/1 24-hr 2-YEAR Rainfall=3.68" Printed 2/6/2023 Summary for Subcatchment 4S: PRE DEV AREA TO THE SOUTH Runoff = 0.52 cfs @ 11.97 hrs, Volume= 0.023 af, Depth> 1.86" 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 2-YEAR Rainfall=3.68" Area (ac) CN Description 0.090 98 0.060 61 >75% Grass cover, Good, HSG B 0.150 83 Weighted Average 0.060 40.00% Pervious Area 0.090 60.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, 0.55 0.5 0.45 0.4 0.35 N 0.3 3 0 0.2 ' 0.15 ' 0.1 0.05 0 5 Subcatchment 4S: PRE DEV AREA TO THE SOUTH 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 Type 24"hr 2-YEAR RairyMIP .68w Runoff Area--U i-ri ac Runoff vof'ume,=0:pi3`af ----Runof(De1- hi -1:ff6" r-- = ,min I N=1 3 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoff PRE POST CALCS Prepared by Timmons Type/1 24-hr 2-YEAR Rainfall=3.68" Printed 2/6/2023 Hydrograph for Subcatchment 4S: PRE DEV AREA TO THE SOUTH Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.23 0.00 0.00 5.25 0.25 0.00 0.00 5.50 0.26 0.00 0.00 5.75 0.28 0.00 0.00 6.00 0.29 0.00 0.00 6.25 0.31 0.00 0.00 6.50 0.33 0.00 0.00 6.75 0.35 0.00 0.00 7.00 0.36 0.00 0.00 7.25 0.38 0.00 0.00 7.50 0.40 0.00 0.00 7.75 0.42 0.00 0.00 8.00 0.44 0.00 0.00 8.25 0.46 0.00 0.00 8.50 0.49 0.00 0.00 8.75 0.51 0.00 0.00 9.00 0.54 0.01 0.00 9.25 0.57 0.01 0.00 9.50 0.60 0.02 0.00 9.75 0.63 0.02 0.00 10.00 0.67 0.03 0.00 10.25 0.71 0.04 0.01 10.50 0.75 0.05 0.01 10.75 0.80 0.06 0.01 11.00 0.86 0.08 0.01 11.25 0.94 0.11 0.02 11.50 1.04 0.15 0.02 11.75 1.42 0.34 0.14 12.00 2.44 1.01 0.49 12.25 2.60 1.13 0.07 12.50 2.70 1.21 0.05 12.75 2.78 1.27 0.03 13.00 2.84 1.32 0.03 13.25 2.89 1.36 0.03 13.50 2.94 1.40 0.02 13.75 2.98 1.43 0.02 14.00 3.02 1.46 0.02 14.25 3.05 1.49 0.02 14.50 3.08 1.51 0.02 14.75 3.11 1.54 0.01 15.00 3.14 1.56 0.01 15.25 3.17 1.58 0.01 15.50 3.19 1.60 0.01 15.75 3.22 1.62 0.01 16.00 3.24 1.64 0.01 16.25 3.26 1.66 0.01 16.50 3.28 1.67 0.01 16.75 3.30 1.69 0.01 17.00 3.32 1.71 0.01 17.25 3.34 1.72 0.01 17.50 3.36 1.74 0.01 17.75 3.37 1.75 0.01 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 3.39 1.77 0.01 18.25 3.41 1.78 0.01 18.50 3.42 1.79 0.01 18.75 3.44 1.81 0.01 19.00 3.45 1.82 0.01 19.25 3.46 1.83 0.01 19.50 3.48 1.84 0.01 19.75 3.49 1.85 0.01 20.00 3.50 1.86 0.01 PRE POST CALCS Prepared by Timmons Type/1 24-hr 2-YEAR Rainfall=3.68" Printed 2/6/2023 Summary for Subcatchment 6S: POST DEV AREA TO THE SOUTH Runoff = 0.20 cfs @ 11.98 hrs, Volume= 0.009 af, Depth> 1.18" 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 2-YEAR Rainfall=3.68" Area (ac) CN Description ' 0.030 98 0.060 61 >75% Grass cover, Good, HSG B 0.090 73 Weighted Average 0.060 66.67% Pervious Area 0.030 33.33% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 6S: POST DEV AREA TO THE SOUTH Hydrograph 022 0.21 .__!____i____!____ 1 ___!____ 0.2 --_�____r___�____�___�____4_ 0.18 0.17 - - _ 0.15 0.14 3 0.11 6 0.1 0.09 ---r ---r ---r 0.08 0.07 " -------r-------L--- ----r- 0.05 0.04 ___----i ___----i------ i r----i- r----r r----r r--- ___i--- -Tu Me-0-24y� �_f_i��_//_cc_IIr►►_ppppJ_�yr(i_A_1_1/�_�le�rOO___ I -L--_I----L----I----L--- --R-un,6ff-Ama1=0-.asa aE- R d offWl'offte .0II of &yyylllM N;: -3- 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (horns) ■ Runoff PRE POST CALCS Prepared by Timmons Type/1 24-hr 2-YEAR Rainfall=3.68" Printed 2/6/2023 Hydrograph for Subcatchment 6S: POST DEV AREA TO THE SOUTH Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.23 0.00 0.00 5.25 0.25 0.00 0.00 5.50 0.26 0.00 0.00 5.75 0.28 0.00 0.00 6.00 0.29 0.00 0.00 6.25 0.31 0.00 0.00 6.50 0.33 0.00 0.00 6.75 0.35 0.00 0.00 7.00 0.36 0.00 0.00 7.25 0.38 0.00 0.00 7.50 0.40 0.00 0.00 7.75 0.42 0.00 0.00 8.00 0.44 0.00 0.00 8.25 0.46 0.00 0.00 8.50 0.49 0.00 0.00 8.75 0.51 0.00 0.00 9.00 0.54 0.00 0.00 9.25 0.57 0.00 0.00 9.50 0.60 0.00 0.00 9.75 0.63 0.00 0.00 10.00 0.67 0.00 0.00 10.25 0.71 0.00 0.00 10.50 0.75 0.00 0.00 10.75 0.80 0.00 0.00 11.00 0.86 0.00 0.00 11.25 0.94 0.01 0.00 11.50 1.04 0.02 0.00 11.75 1.42 0.11 0.04 12.00 2.44 0.54 0.20 12.25 2.60 0.62 0.03 12.50 2.70 0.68 0.02 12.75 2.78 0.72 0.02 13.00 2.84 0.76 0.01 13.25 2.89 0.79 0.01 13.50 2.94 0.82 0.01 13.75 2.98 0.85 0.01 14.00 3.02 0.87 0.01 14.25 3.05 0.89 0.01 14.50 3.08 0.91 0.01 14.75 3.11 0.93 0.01 15.00 3.14 0.95 0.01 15.25 3.17 0.96 0.01 15.50 3.19 0.98 0.01 15.75 3.22 0.99 0.01 16.00 3.24 1.01 0.01 16.25 3.26 1.02 0.00 16.50 3.28 1.03 0.00 16.75 3.30 1.05 0.00 17.00 3.32 1.06 0.00 17.25 3.34 1.07 0.00 17.50 3.36 1.08 0.00 17.75 3.37 1.09 0.00 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 3.39 1.11 0.00 18.25 3.41 1.12 0.00 18.50 3.42 1.13 0.00 18.75 3.44 1.14 0.00 19.00 3.45 1.15 0.00 19.25 3.46 1.16 0.00 19.50 3.48 1.17 0.00 19.75 3.49 1.17 0.00 20.00 3.50 1.18 0.00 PRE _POST CALCS Type // 24-hr 10-YEAR Rainfall=5.56" Prepared by Timmons Group Printed 2/6/2023 HydroCAD® 10.10-7a s/n 08663 © 2021 HydroCAD Software Solutions LLC Page 24 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method SubcatchmentlS: PRE DEV AREAOF Runoff Area=1.010 ac 51.49% Impervious Runoff Depth>3.15" Tc=0.0 min CN=80 Runoff=6.84 cfs 0.265 of Subcatchment2S: POST DEV AREA OF Runoff Area=1.010 ac 81.19% Impervious Runoff Depth>4.24" Tc=6.0 min CN=91 Runoff=7.26 cfs 0.357 of Subcatchment4S: PRE DEV AREA TO THE Runoff Area=0.150 ac 60.00% Impervious Runoff Depth>3.44" Tc=6.0 min CN=83 Runoff=0.93 cfs 0.043 of Subcatchment6S: POST DEV AREATO Runoff Area=0.090 ac 33.33% Impervious Runoff Depth >2.51" Tc=6.0 min CN=73 Runoff=0.42 cfs 0.019 of Total Runoff Area = 2.260 ac Runoff Volume = 0.684 of Average Runoff Depth = 3.63" 35.40% Pervious = 0.800 ac 64.60% Impervious = 1.460 ac PRE POST CALCS Prepared by Timmons Type // 24-hr 10-YEAR Rainfall=5.56" Printed 2/6/2023 Summary for Subcatchment 1S: PRE DEV AREA OF ANALYSIS 1 Runoff = 6.84 cfs @ 11.89 hrs, Volume= 0.265 af, Depth> 3.15" 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=5.56" Area (ac) CN Descriotion 0.380 98 Paved parking, HSG B 0.140 98 Water Surface, HSG B 0.490 61 >75% Grass cover, Good, HSG B 1.010 80 Weighted Average 0.490 48.51 % Pervious Area 0.520 51.49% Impervious Area Subcatchment 1S: PRE DEV AREA OF ANALYSIS 1 Hydrograph ❑ Runoff 7 Type II 24-hr 10-YEAR Rainfall=5.56" Runoff Area=1.010 ac 5 Runoff Volume=0.265 of Runoff Depth>3.15" LL Tc=0.0 min 3 CN=80 Z , Time (hours) PRE POST CALCS Prepared by Timmons Type // 24-hr 10-YEAR Rainfall=5.56" Printed 2/6/2023 Hydrograph for Subcatchment 1S: PRE DEV AREA OF ANALYSIS 1 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 0.44 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 0.01 7.50 0.61 0.00 0.01 7.75 0.64 0.01 0.01 8.00 0.67 0.01 0.02 8.25 0.70 0.01 0.02 8.50 0.74 0.02 0.03 8.75 0.77 0.03 0.03 9.00 0.82 0.04 0.04 9.25 0.86 0.05 0.04 9.50 0.91 0.06 0.05 9.75 0.95 0.07 0.06 10.00 1.01 0.09 0.07 10.25 1.07 0.10 0.09 10.50 1.13 0.13 0.11 10.75 1.21 0.16 0.14 11.00 1.31 0.20 0.18 11.25 1.42 0.25 0.25 11.50 1.57 0.32 0.39 11.75 2.15 0.66 2.67 12.00 3.69 1.79 1.34 12.25 3.93 1.98 0.67 12.50 4.09 2.11 0.41 12.75 4.20 2.21 0.35 13.00 4.29 2.29 0.29 13.25 4.37 2.35 0.26 13.50 4.44 2.41 0.23 13.75 4.50 2.47 0.20 14.00 4.56 2.51 0.18 14.25 4.61 2.56 0.17 14.50 4.66 2.60 0.16 14.75 4.70 2.64 0.15 15.00 4.75 2.67 0.15 15.25 4.79 2.71 0.14 15.50 4.82 2.74 0.13 15.75 4.86 2.77 0.12 16.00 4.89 2.80 0.11 16.25 4.92 2.83 0.11 16.50 4.96 2.85 0.11 16.75 4.98 2.88 0.10 17.00 5.01 2.90 0.10 17.25 5.04 2.93 0.10 17.50 5.07 2.95 0.10 17.75 5.10 2.98 0.09 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 5.12 3.00 0.09 18.25 5.15 3.02 0.09 18.50 5.17 3.04 0.08 18.75 5.19 3.06 0.08 19.00 5.21 3.08 0.08 19.25 5.24 3.10 0.07 19.50 5.26 3.12 0.07 19.75 5.27 3.13 0.07 20.00 5.29 3.15 0.07 PRE POST CALCS Prepared by Timmons Type // 24-hr 10-YEAR Rainfall=5.56" Printed 2/6/2023 Summary for Subcatchment 2S: POST DEV AREA OF ANALYSIS 1 Runoff = 7.26 cfs @ 11.96 hrs, Volume= 0.357 af, Depth> 4.24" 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=5.56" Area (ac) CN Description 0.630 98 Paved parking, HSG B 0.190 98 Water Surface, HSG B 0.190 61 >75% Grass cover, Good, HSG B 1.010 91 Weighted Average 0.190 18.81 % Pervious Area 0.820 81.19% Impervious Area Tc Length 0 r, Capacity Description Direct Entry, Subcatchment 2S: POST DEV AREA OF ANALYSIS 1 Hydrograph -Y 6 I I I I I --,----r I T I 7- 5 I I I I I I I I I I I I -----I - -- I -- --T --- -I -- -- 74- 3 I I I I I I I I I I I I I I Type II 24-hr ----I-10-YEAR Rainfall=5.56" Runoff Area=1.010 ac Runoff Volume=0.357 of Runoff Depth>4.24" Tc=6.0 min CN=91 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Runoff PRE POST CALCS Prepared by Timmons Type // 24-hr 10-YEAR Rainfall=5.56" Printed 2/6/2023 Hydrograph for Subcatchment 2S: POST DEV AREA OF ANALYSIS 1 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.35 0.02 0.02 5.25 0.37 0.03 0.02 5.50 0.40 0.03 0.03 5.75 0.42 0.04 0.03 6.00 0.44 0.05 0.04 6.25 0.47 0.06 0.04 6.50 0.50 0.07 0.04 6.75 0.52 0.08 0.05 7.00 0.55 0.09 0.05 7.25 0.58 0.11 0.05 7.50 0.61 0.12 0.06 7.75 0.64 0.14 0.06 8.00 0.67 0.15 0.07 8.25 0.70 0.17 0.07 8.50 0.74 0.19 0.08 8.75 0.77 0.21 0.10 9.00 0.82 0.24 0.11 9.25 0.86 0.27 0.12 9.50 0.91 0.30 0.12 9.75 0.95 0.33 0.13 10.00 1.01 0.36 0.15 10.25 1.07 0.41 0.18 10.50 1.13 0.46 0.21 10.75 1.21 0.51 0.25 11.00 1.31 0.59 0.30 11.25 1.42 0.68 0.39 11.50 1.57 0.80 0.51 11.75 2.15 1.30 2.41 12.00 3.69 2.72 6.75 12.25 3.93 2.95 0.91 12.50 4.09 3.10 0.59 12.75 4.20 3.21 0.43 13.00 4.29 3.30 0.36 13.25 4.37 3.37 0.31 13.50 4.44 3.44 0.27 13.75 4.50 3.50 0.24 14.00 4.56 3.56 0.21 14.25 4.61 3.60 0.20 14.50 4.66 3.65 0.19 14.75 4.70 3.69 0.18 15.00 4.75 3.74 0.17 15.25 4.79 3.77 0.16 15.50 4.82 3.81 0.15 15.75 4.86 3.85 0.14 16.00 4.89 3.88 0.13 16.25 4.92 3.91 0.12 16.50 4.96 3.94 0.12 16.75 4.98 3.97 0.12 17.00 5.01 4.00 0.11 17.25 5.04 4.02 0.11 17.50 5.07 4.05 0.11 17.75 5.10 4.07 0.10 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 5.12 4.10 0.10 18.25 5.15 4.12 0.10 18.50 5.17 4.15 0.09 18.75 5.19 4.17 0.09 19.00 5.21 4.19 0.09 19.25 5.24 4.21 0.08 19.50 5.26 4.23 0.08 19.75 5.27 4.25 0.08 20.00 5.29 4.27 0.07 PRE POST CALCS Prepared by Timmons Type // 24-hr 10-YEAR Rainfall=5.56" Printed 2/6/2023 Summary for Subcatchment 4S: PRE DEV AREA TO THE SOUTH Runoff = 0.93 cfs @ 11.97 hrs, Volume= 0.043 af, Depth> 3.44" 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=5.56" Area (ac) CN Description 0.090 98 0.060 61 >75% Grass cover, Good, HSG B 0.150 83 Weighted Average 0.060 40.00% Pervious Area 0.090 60.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, 1 Subcatchment 4S: PRE DEV AREA TO THE SOUTH Hydrograph Type II 24-hr 10-YEAR Rainfall=5.56" Runoff Area=0.150 ac Runoff Volume=0.043 of Runoff Depth>3.44" 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) ❑ Runoff PRE POST CALCS Prepared by Timmons Type // 24-hr 10-YEAR Rainfall=5.56" Printed 2/6/2023 Hydrograph for Subcatchment 4S: PRE DEV AREA TO THE SOUTH 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 0.44 0.00 0.00 6.25 0.47 0.00 0.00 6.50 0.50 0.00 0.00 6.75 0.52 0.01 0.00 7.00 0.55 0.01 0.00 7.25 0.58 0.01 0.00 7.50 0.61 0.02 0.00 7.75 0.64 0.02 0.00 8.00 0.67 0.03 0.00 8.25 0.70 0.04 0.00 8.50 0.74 0.04 0.01 8.75 0.77 0.06 0.01 9.00 0.82 0.07 0.01 9.25 0.86 0.08 0.01 9.50 0.91 0.10 0.01 9.75 0.95 0.11 0.01 10.00 1.01 0.13 0.01 10.25 1.07 0.16 0.02 10.50 1.13 0.19 0.02 10.75 1.21 0.23 0.02 11.00 1.31 0.27 0.03 11.25 1.42 0.34 0.04 11.50 1.57 0.42 0.05 11.75 2.15 0.80 0.27 12.00 3.69 2.02 0.87 12.25 3.93 2.22 0.12 12.50 4.09 2.36 0.08 12.75 4.20 2.46 0.06 13.00 4.29 2.54 0.05 13.25 4.37 2.61 0.04 13.50 4.44 2.67 0.04 13.75 4.50 2.73 0.03 14.00 4.56 2.78 0.03 14.25 4.61 2.82 0.03 14.50 4.66 2.87 0.03 14.75 4.70 2.91 0.02 15.00 4.75 2.94 0.02 15.25 4.79 2.98 0.02 15.50 4.82 3.02 0.02 15.75 4.86 3.05 0.02 16.00 4.89 3.08 0.02 16.25 4.92 3.11 0.02 16.50 4.96 3.13 0.02 16.75 4.98 3.16 0.02 17.00 5.01 3.19 0.02 17.25 5.04 3.21 0.02 17.50 5.07 3.24 0.01 17.75 5.10 3.26 0.01 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 5.12 3.28 0.01 18.25 5.15 3.31 0.01 18.50 5.17 3.33 0.01 18.75 5.19 3.35 0.01 19.00 5.21 3.37 0.01 19.25 5.24 3.39 0.01 19.50 5.26 3.41 0.01 19.75 5.27 3.42 0.01 20.00 5.29 3.44 0.01 PRE POST CALCS Prepared by Timmons Type // 24-hr 10-YEAR Rainfall=5.56" Printed 2/6/2023 Summary for Subcatchment 6S: POST DEV AREA TO THE SOUTH Runoff = 0.42 cfs @ 11.97 hrs, Volume= 0.019 af, Depth> 2.51" 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=5.56" Area (ac) CN Description 0.030 98 0.060 61 >75% Grass cover, Good, HSG B 0.090 73 Weighted Average 0.060 66.67% Pervious Area 0.030 33.33% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 6S: POST DEV AREA TO THE SOUTH Hydrograph 0.46 0.44 0.40.36 --_J___-L---L-___L_--L----L- III 0.34 ------- ___!____. _ 0.32 0.3r- ---I --- ---I --- ---I 0.28'---L----L---L----L---L----�- � 0.26 024 0 0.22 ---J-------J----`---J----`- LL 0.18 I 0.12 ----------- ----�--- ----�- om I - 0.06---L----L-__J----L---L----� 0.04 I 1hr-- r - -- Tpe-H-24 ___J__Y 1-NYEAR-RainaHT5:6"- ---1 r r r - -- --ftndff-Ares=ii 09a ac- Ruoiciff tof'pmg--0:pfi9taf ----- --Runo Depth-;P2-.54"- Tc=6.0 min - I I I I I I I I 10 11 12 13 14 16 16 17 18 19 20 Time (horns) ■ Runoff PRE POST CALCS Prepared by Timmons Type // 24-hr 10-YEAR Rainfall=5.56" Printed 2/6/2023 Hydrograph for Subcatchment 6S: POST DEV AREA TO THE SOUTH 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 0.44 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 0.77 0.00 0.00 9.00 0.82 0.00 0.00 9.25 0.86 0.00 0.00 9.50 0.91 0.01 0.00 9.75 0.95 0.01 0.00 10.00 1.01 0.02 0.00 10.25 1.07 0.03 0.00 10.50 1.13 0.04 0.00 10.75 1.21 0.05 0.01 11.00 1.31 0.08 0.01 11.25 1.42 0.11 0.01 11.50 1.57 0.15 0.02 11.75 2.15 0.39 0.10 12.00 3.69 1.31 0.41 12.25 3.93 1.47 0.06 12.50 4.09 1.59 0.04 12.75 4.20 1.67 0.03 13.00 4.29 1.74 0.02 13.25 4.37 1.80 0.02 13.50 4.44 1.85 0.02 13.75 4.50 1.90 0.02 14.00 4.56 1.94 0.01 14.25 4.61 1.98 0.01 14.50 4.66 2.02 0.01 14.75 4.70 2.05 0.01 15.00 4.75 2.08 0.01 15.25 4.79 2.11 0.01 15.50 4.82 2.14 0.01 15.75 4.86 2.17 0.01 16.00 4.89 2.20 0.01 16.25 4.92 2.22 0.01 16.50 4.96 2.25 0.01 16.75 4.98 2.27 0.01 17.00 5.01 2.29 0.01 17.25 5.04 2.31 0.01 17.50 5.07 2.33 0.01 17.75 5.10 2.36 0.01 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 5.12 2.38 0.01 18.25 5.15 2.39 0.01 18.50 5.17 2.41 0.01 18.75 5.19 2.43 0.01 19.00 5.21 2.45 0.01 19.25 5.24 2.47 0.01 19.50 5.26 2.48 0.01 19.75 5.27 2.50 0.01 20.00 5.29 2.51 0.01 PRE _POST CALCS Type 1124-hr 100-YEAR Rainfall=9.12" Prepared by Timmons Group Printed 2/6/2023 HydroCAD® 10.10-7a s/n 08663 © 2021 HydroCAD Software Solutions LLC Page 33 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method SubcatchmentlS: PRE DEV AREAOF Runoff Area=1.010 ac 51.49% Impervious Runoff Depth>6.27" Tc=0.0 min CN=80 Runoff=12.94 cfs 0.528 of Subcatchment2S: POST DEV AREA OF Runoff Area=1.010 ac 81.19% Impervious Runoff Depth>7.49" Tc=6.0 min CN=91 Runoff=12.41 cfs 0.631 of Subcatchment4S: PRE DEV AREA TO THE Runoff Area=0.150 ac 60.00% Impervious Runoff Depth >6.61" Tc=6.0 min CN=83 Runoff=1.71 cfs 0.083 of Subcatchment6S: POST DEV AREATO Runoff Area=0.090 ac 33.33% Impervious Runoff Depth >5.41" Tc=6.0 min CN=73 Runoff=0.88 cfs 0.041 of Total Runoff Area = 2.260 ac Runoff Volume = 1.282 of Average Runoff Depth = 6.81" 35.40% Pervious = 0.800 ac 64.60% Impervious = 1.460 ac PRE POST CALCS Prepared by Timmons Type 1124-hr 100-YEAR Rainfall=9.12" Printed 2/6/2023 Summary for Subcatchment 1S: PRE DEV AREA OF ANALYSIS 1 Runoff = 12.94 cfs @ 11.89 hrs, Volume= 0.528 af, Depth> 6.27" 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 100-YEAR Rainfall=9.12" Area (ac) CN Descriotion 0.380 98 Paved parking, HSG B 0.140 98 Water Surface, HSG B 0.490 61 >75% Grass cover, Good, HSG B 1.010 80 Weighted Average 0.490 48.51 % Pervious Area 0.520 51.49% Impervious Area Subcatchment 1S: PRE DEV AREA OF ANALYSIS 1 Hydrograph ❑Runoff T — — — —i — —— 1294 cfs———————T — — — —T - --- Type II 24-hr 100-YEAR Rainfall=9.12" Runoff Area=1.010 ac 9 Runoff Volume=0.528 of 8 -Runoff Depth>6.27" ,� 5 ---- T F Tc=0.0 min -----1--- PN=80 5 i i i 4 i 3 21 1 12 13 Time (hours) PRE POST CALCS Prepared by Timmons Type 1124-hr 100-YEAR Rainfall=9.12" Printed 2/6/2023 Hydrograph for Subcatchment 1S: PRE DEV AREA OF ANALYSIS 1 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.57 0.00 0.01 5.25 0.61 0.00 0.01 5.50 0.65 0.01 0.02 5.75 0.69 0.01 0.02 6.00 0.73 0.02 0.03 6.25 0.77 0.03 0.03 6.50 0.81 0.04 0.04 6.75 0.86 0.04 0.04 7.00 0.90 0.06 0.05 7.25 0.95 0.07 0.05 7.50 1.00 0.08 0.06 7.75 1.04 0.10 0.07 8.00 1.09 0.11 0.07 8.25 1.15 0.13 0.08 8.50 1.21 0.16 0.10 8.75 1.27 0.18 0.11 9.00 1.34 0.21 0.13 9.25 1.41 0.24 0.14 9.50 1.49 0.28 0.14 9.75 1.56 0.32 0.17 10.00 1.65 0.36 0.20 10.25 1.75 0.42 0.24 10.50 1.86 0.48 0.28 10.75 1.99 0.56 0.35 11.00 2.14 0.65 0.43 11.25 2.33 0.78 0.60 11.50 2.58 0.95 0.88 11.75 3.53 1.66 5.46 12.00 6.05 3.82 2.46 12.25 6.44 4.18 1.22 12.50 6.70 4.42 0.75 12.75 6.89 4.59 0.63 13.00 7.04 4.73 0.52 13.25 7.17 4.85 0.46 13.50 7.29 4.96 0.41 13.75 7.39 5.05 0.36 14.00 7.48 5.14 0.32 14.25 7.56 5.21 0.31 14.50 7.64 5.29 0.29 14.75 7.71 5.36 0.28 15.00 7.78 5.42 0.26 15.25 7.85 5.48 0.25 15.50 7.91 5.54 0.23 15.75 7.97 5.60 0.22 16.00 8.03 5.65 0.20 16.25 8.08 5.70 0.20 16.50 8.13 5.74 0.19 16.75 8.18 5.79 0.18 17.00 8.22 5.84 0.18 17.25 8.27 5.88 0.17 17.50 8.31 5.92 0.17 17.75 8.36 5.96 0.16 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 8.40 6.00 0.16 18.25 8.44 6.04 0.15 18.50 8.48 6.08 0.15 18.75 8.52 6.11 0.14 19.00 8.55 6.14 0.14 19.25 8.59 6.18 0.13 19.50 8.62 6.21 0.13 19.75 8.65 6.24 0.12 20.00 8.68 6.27 0.11 PRE POST CALCS Prepared by Timmons Type 1124-hr 100-YEAR Rainfall=9.12" Printed 2/6/2023 Summary for Subcatchment 2S: POST DEV AREA OF ANALYSIS 1 Runoff = 12.41 cfs @ 11.96 hrs, Volume= 0.631 af, Depth> 7.49" 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 100-YEAR Rainfall=9.12" Area (ac) CN Description 0.630 98 Paved parking, HSG B 0.190 98 Water Surface, HSG B 0.190 61 >75% Grass cover, Good, HSG B 1.010 91 Weighted Average 0.190 18.81 % Pervious Area 0.820 81.19% Impervious Area Tc Length Capacity Description 6.0 Direct Entry, Subcatchment 2S: POST DEV AREA OF ANALYSIS 1 Hydrograph ----------------- 13 1 1 1 1 1 �z.n ire 1 12 I I I 1 Type II 24-hr 11 100,•YEAR Rainfallr9.112" 0 _ _Runbff_Areak=1.010 ac _ 1 1 1 1 1 1 9 --- --- - ------ ,Rupoff',LV-ojuntq=0-:1,63Vaf-- 8 - - -- 1-----.-Runof Delpth;1>7.�9"- o - T-0 Min ---- LL s 1 5 1 1 1 1 1 1 1 1 1 1 1 �N=J1 1 1 1 1 1 1 1 1 1 1 1 1 1 q 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 3 1 1 1 1 1 1 1 1 1 1 1 1 1 _I _i _i 2 , -I -T -r -T -I -T 0 5 6 7 8 9 19 11 12 13 14 15 16 17 18 19 26 Time (hours) ❑ Runoff PRE POST CALCS Prepared by Timmons Type 1124-hr 100-YEAR Rainfall=9.12" Printed 2/6/2023 Hydrograph for Subcatchment 2S: POST DEV AREA OF ANALYSIS 1 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.57 0.10 0.07 5.25 0.61 0.12 0.07 5.50 0.65 0.14 0.08 5.75 0.69 0.16 0.09 6.00 0.73 0.19 0.09 6.25 0.77 0.21 0.10 6.50 0.81 0.24 0.11 6.75 0.86 0.26 0.11 7.00 0.90 0.29 0.12 7.25 0.95 0.32 0.13 7.50 1.00 0.36 0.13 7.75 1.04 0.39 0.14 8.00 1.09 0.43 0.15 8.25 1.15 0.47 0.16 8.50 1.21 0.51 0.18 8.75 1.27 0.56 0.20 9.00 1.34 0.61 0.22 9.25 1.41 0.67 0.24 9.50 1.49 0.73 0.24 9.75 1.56 0.79 0.26 10.00 1.65 0.86 0.30 10.25 1.75 0.95 0.34 10.50 1.86 1.04 0.40 10.75 1.99 1.16 0.47 11.00 2.14 1.29 0.56 11.25 2.33 1.46 0.72 11.50 2.58 1.68 0.94 11.75 3.53 2.57 4.28 12.00 6.05 5.00 11.49 12.25 6.44 5.39 1.54 12.50 6.70 5.65 0.99 12.75 6.89 5.83 0.72 13.00 7.04 5.98 0.60 13.25 7.17 6.11 0.52 13.50 7.29 6.22 0.45 13.75 7.39 6.32 0.40 14.00 7.48 6.41 0.36 14.25 7.56 6.49 0.33 14.50 7.64 6.57 0.31 14.75 7.71 6.64 0.30 15.00 7.78 6.71 0.28 15.25 7.85 6.78 0.26 15.50 7.91 6.84 0.25 15.75 7.97 6.90 0.23 16.00 8.03 6.95 0.22 16.25 8.08 7.00 0.21 16.50 8.13 7.05 0.20 16.75 8.18 7.10 0.20 17.00 8.22 7.15 0.19 17.25 8.27 7.19 0.18 17.50 8.31 7.24 0.18 17.75 8.36 7.28 0.17 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 8.40 7.32 0.17 18.25 8.44 7.36 0.16 18.50 8.48 7.40 0.16 18.75 8.52 7.43 0.15 19.00 8.55 7.47 0.14 19.25 8.59 7.50 0.14 19.50 8.62 7.54 0.13 19.75 8.65 7.57 0.13 20.00 8.68 7.60 0.12 PRE POST CALCS Prepared by Timmons Type 1124-hr 100-YEAR Rainfall=9.12" Printed 2/6/2023 Summary for Subcatchment 4S: PRE DEV AREA TO THE SOUTH Runoff = 1.71 cfs @ 11.96 hrs, Volume= 0.083 af, Depth> 6.61" 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 100-YEAR Rainfall=9.12" Area (ac) CN Description 0.090 98 0.060 61 >75% Grass cover, Good, HSG B 0.150 83 Weighted Average 0.060 40.00% Pervious Area 0.090 60.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 4S: PRE DEV AREA TO THE SOUTH Hydrograph ❑ Runoff 1.]1 ch Type II 24-hr 100-YEAR Rainfall=9.12" Runoff Area=0.150 ac Runoff Volume=0.083 of Runoff Depth>6.61" LL Tc=6.0 min CN=83 5678910111213141516171819iO PRE POST CALCS Prepared by Timmons Type 1124-hr 100-YEAR Rainfall=9.12" Printed 2/6/2023 Hydrograph for Subcatchment 4S: PRE DEV AREA TO THE SOUTH Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.57 0.01 0.00 5.25 0.61 0.02 0.00 5.50 0.65 0.03 0.00 5.75 0.69 0.03 0.01 6.00 0.73 0.04 0.01 6.25 0.77 0.05 0.01 6.50 0.81 0.07 0.01 6.75 0.86 0.08 0.01 7.00 0.90 0.10 0.01 7.25 0.95 0.11 0.01 7.50 1.00 0.13 0.01 7.75 1.04 0.15 0.01 8.00 1.09 0.17 0.01 8.25 1.15 0.20 0.01 8.50 1.21 0.22 0.02 8.75 1.27 0.25 0.02 9.00 1.34 0.29 0.02 9.25 1.41 0.33 0.02 9.50 1.49 0.37 0.02 9.75 1.56 0.42 0.03 10.00 1.65 0.47 0.03 10.25 1.75 0.53 0.04 10.50 1.86 0.60 0.04 10.75 1.99 0.69 0.05 11.00 2.14 0.79 0.07 11.25 2.33 0.93 0.09 11.50 2.58 1.12 0.12 11.75 3.53 1.88 0.55 12.00 6.05 4.13 1.59 12.25 6.44 4.50 0.22 12.50 6.70 4.75 0.14 12.75 6.89 4.92 0.10 13.00 7.04 5.07 0.09 13.25 7.17 5.19 0.07 13.50 7.29 5.30 0.06 13.75 7.39 5.40 0.06 14.00 7.48 5.48 0.05 14.25 7.56 5.56 0.05 14.50 7.64 5.63 0.04 14.75 7.71 5.70 0.04 15.00 7.78 5.77 0.04 15.25 7.85 5.83 0.04 15.50 7.91 5.89 0.04 15.75 7.97 5.95 0.03 16.00 8.03 6.00 0.03 16.25 8.08 6.05 0.03 16.50 8.13 6.10 0.03 16.75 8.18 6.15 0.03 17.00 8.22 6.19 0.03 17.25 8.27 6.24 0.03 17.50 8.31 6.28 0.03 17.75 8.36 6.32 0.02 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 8.40 6.36 0.02 18.25 8.44 6.40 0.02 18.50 8.48 6.44 0.02 18.75 8.52 6.47 0.02 19.00 8.55 6.51 0.02 19.25 8.59 6.54 0.02 19.50 8.62 6.57 0.02 19.75 8.65 6.60 0.02 20.00 8.68 6.63 0.02 PRE POST CALCS Prepared by Timmons Type 1124-hr 100-YEAR Rainfall=9.12" Printed 2/6/2023 Summary for Subcatchment 6S: POST DEV AREA TO THE SOUTH Runoff = 0.88 cfs @ 11.97 hrs, Volume= 0.041 af, Depth> 5.41" 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 100-YEAR Rainfall=9.12" Area (ac) CN Description 0.030 98 0.060 61 >75% Grass cover, Good, HSG B 0.090 73 Weighted Average 0.060 66.67% Pervious Area 0.030 33.33% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 6S: POST DEV AREA TO THE SOUTH ' oae as Type II 24-hr 0.85 100=-YEAR-IIIRainfaii�=-9.-j2!' 0.7 "" -------+---------- ------ --- -IRunoffArsa-=-0.090ac- 0.65 .__+____+___+____+___+_ f_ + I I __ _ I I I __ _ __-_- _-- n_off-_clf_- _- I--411- 00.5 __yl____I-___yl____r___yl____i _ __i ___ -__Rgrn -DoptNP6.4,11w- "I 045 "Ic�61�o_rYll�n_ --------+---+----+---+------ ---r----r---r----r---r----r- -------- ---r--------r- ----+------- -----+.__ --1- M LL 04 ��17J 0.35 ---r----r---r----r---rr - - - ---- r----I----r- --I----r----r---r--- 0.3 i 0.25 ---r----r---r----r---r----r ---r----I----r- --I----r----r---r--- 02 "I ---r----r---r----r---r----r ---r----I----r- --I----r----r---r--- 0.15 I I----I----r----I----r --r----I----r- --I----r----r---r--_ 0.1 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Runoff PRE POST CALCS Prepared by Timmons Type 1124-hr 100-YEAR Rainfall=9.12" Printed 2/6/2023 Hydrograph for Subcatchment 6S: POST DEV AREA TO THE SOUTH Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.57 0.00 0.00 5.25 0.61 0.00 0.00 5.50 0.65 0.00 0.00 5.75 0.69 0.00 0.00 6.00 0.73 0.00 0.00 6.25 0.77 0.00 0.00 6.50 0.81 0.00 0.00 6.75 0.86 0.00 0.00 7.00 0.90 0.01 0.00 7.25 0.95 0.01 0.00 7.50 1.00 0.02 0.00 7.75 1.04 0.02 0.00 8.00 1.09 0.03 0.00 8.25 1.15 0.04 0.00 8.50 1.21 0.05 0.00 8.75 1.27 0.07 0.01 9.00 1.34 0.08 0.01 9.25 1.41 0.10 0.01 9.50 1.49 0.13 0.01 9.75 1.56 0.15 0.01 10.00 1.65 0.18 0.01 10.25 1.75 0.22 0.01 10.50 1.86 0.26 0.02 10.75 1.99 0.32 0.02 11.00 2.14 0.39 0.03 11.25 2.33 0.48 0.04 11.50 2.58 0.61 0.05 11.75 3.53 1.20 0.25 12.00 6.05 3.13 0.83 12.25 6.44 3.46 0.12 12.50 6.70 3.68 0.08 12.75 6.89 3.84 0.06 13.00 7.04 3.97 0.05 13.25 7.17 4.08 0.04 13.50 7.29 4.18 0.04 13.75 7.39 4.27 0.03 14.00 7.48 4.35 0.03 14.25 7.56 4.42 0.03 14.50 7.64 4.49 0.02 14.75 7.71 4.56 0.02 15.00 7.78 4.62 0.02 15.25 7.85 4.68 0.02 15.50 7.91 4.73 0.02 15.75 7.97 4.78 0.02 16.00 8.03 4.83 0.02 16.25 8.08 4.88 0.02 16.50 8.13 4.92 0.02 16.75 8.18 4.97 0.02 17.00 8.22 5.01 0.02 17.25 8.27 5.05 0.01 17.50 8.31 5.09 0.01 17.75 8.36 5.13 0.01 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 8.40 5.17 0.01 18.25 8.44 5.20 0.01 18.50 8.48 5.24 0.01 18.75 8.52 5.27 0.01 19.00 8.55 5.30 0.01 19.25 8.59 5.33 0.01 19.50 8.62 5.36 0.01 19.75 8.65 5.39 0.01 20.00 8.68 5.42 0.01 PRE POST CALCS Prepared by Timmons TABLE OF CONTENTS Project Reports 1 Routing Diagram 2 Rainfall Events Listing 3 Area Listing (all nodes) 4 Soil Listing (all nodes) 5 Ground Covers (all nodes) 1-YEAR Event 6 Node Listing 7 Subcat IS: PRE DEV AREA OF ANALYSIS 1 9 Subcat 2S: POST DEV AREA OF ANALYSIS 1 11 Subcat 4S: PRE DEV AREA TO THE SOUTH 13 Subcat 6S: POST DEV AREA TO THE SOUTH 2-YEAR Event 15 Node Listing 16 Subcat 1S: PRE DEV AREA OF ANALYSIS 1 18 Subcat 2S: POST DEV AREA OF ANALYSIS 1 20 Subcat 4S: PRE DEV AREA TO THE SOUTH 22 Subcat 6S: POST DEV AREA TO THE SOUTH 10-YEAR Event 24 Node Listing 25 Subcat 1S: PRE DEV AREA OF ANALYSIS 1 27 Subcat 2S: POST DEV AREA OF ANALYSIS 1 29 Subcat 4S: PRE DEV AREA TO THE SOUTH 31 Subcat 6S: POST DEV AREA TO THE SOUTH 100-YEAR Event 33 Node Listing 34 Subcat 1S: PRE DEV AREA OF ANALYSIS 1 36 Subcat 2S: POST DEV AREA OF ANALYSIS 1 38 Subcat 4S: PRE DEV AREA TO THE SOUTH 40 Subcat 6S: POST DEV AREA TO THE SOUTH Table of Contents Printed 2/6/2023 DEQ Virginia Runoff Reduction Method Re -Develop, 02012 BMP Standards and Specifications 02013 Draft BMP Standards and Specifications Project Name: Boar's Head Sports Club Pool Reno Date: 2/6/2023 Linear Development Project? No Site Information Project (Treatment Volume and Loads) Enter Total Disturbed Area (acres) Pre-ReDevelopment land Cover (acres( A soils BSoils CSoils DSoils Totals Forest/Open Space (acres) --undisturbed forest/open space Ir Managed Turflacresl -- disturbed, graded for yards or other turf to be mawetl/managed 0.49 0'49 Impervious Cover (acres) 0.61 0.61 data Input tells constant values calculation cells Linearproject? No Land cover areas entered correctly? ✓ Total disturbed area entered? v/ Post -Development land Cover (acres( A Soils BSoils Csoils DSoils Totals Forest/Open Space (acres)--unlisturbed, protected forest/o s or reforested land 0.00 Managed Turf(acres) disturbed, graded for yards or other turf to be mowed/managed 0.25 0.25 Impervious Cover(acres) 0.85 0.85 Area Check OK. OK. OK. OK. 1.10 0.95 Pre-ReDevelopment Listed Adjusted' Past ReDev. & New Impervious Forest/Open Space Cancer (acres) 0.00 0.00 ForBst/Or(acresipBn ace 0.00 CoveWeighted Rv(foresd 0.00 0.00 Weighted Ranorest) 0.00 %Forest 0% 0% %Forest 0% Managed Turf Copper (acres) 0A9 0.25 Managed Turf Cover 0.25 (acres) Weighted Beirut) 0.20 0.20 Weighted go (turf) 0.20 %Managed Turf 45% 29% %Managetl Turf 23% Impervious Cover (acres( 0.61 0.61 Impervious Cover 0.95 (acres) Rv(impervipeal 0.95 0.95 Rv(impervious) 0.95 %lmperviaus 55% 71% %Impervious 77% Total She Area (acres) 1.10 0.96 Final Site Area (acres) 1.10 site ga 0.62 0.73 Final Post Den site Re 0.78 Treatment Volume and Nutrient Load Final Part- Pre-ReDevelopment Treatment Volume 0.0565 0.0525 Development 0.0715 (acre-fit) TreatmentVolume (acre-ft) FinalPart- Pre-ReDevelopment Treatment Volume 2459 2,285 Development 3,113 (cubic felt) Treatment Volume (cubicfeetl Pre-ReDevelopment TP Load Final Post- (Ib/yr) 1.55 1.44 Development TP Load 1.96 (lb/yr) prPReOevelopmen[lP Load per Final Past-Developnvot TP Ilb/arre/yrl lA0 1.67 Lead per arm 1,79 (Ib/ave/yr) Baseline TP Load (Ibl n) (0A116s/ave/yr applied to pre- redevelopment area erduding pervious 0.35 land proposed for new impervious cover) 'Adjusted Land Cover Summary: one ReDevelopment land cover minus pervious land cover (fores ,open spare or m paged turf) acreage proposedfor new impervious cover. deputed total acreage is consistent with Past-RaDavebpmentarcades, (minus acreage fnewimcervbas cover). robmn Ishows load reduction requdement/or new impervious cover (anneal on new fevelopment load limit 0.41 Ihs/acre/year). TP Wad Reduction Required (lb/yr) D xli 0.05 0.25 0.95 Post-ReDevelopment Forest/Open Space Cover (acres) 000 Weighted Raibresq 0.00 %Forest 0% Managed Turf Cover aces) 0.25 Weighted Rv (turf) 0.20 %Managetl Turf 29% ReDev. Impervious Cover (acres) 0.61 Ra(impervious) 0.95 %Impervious 71% Total ReDev. site Area (acres) 0.86 ReDev She Re 0.73 Treatment Volume and Nutrient Load 0.71 Post-ReDevelopment Treatment Volume 0.0525 (ace-ft) PoBI ReDevelopment Treatment Volume 2,285 (Cube feet) Port-ReDeveopment Load (TP) IM (lb/yr)a Post-ReDevelopment TP Load per acre (lb/acre/yr) Max. induction Required (Below Pre- 20% ReDevelopment Load) TP Load Reduction Required for Redeveloped Area 0.29 (Ib/Yrl Nitrogen Loads (Informational Purposes Only) Final Post -Development TN Load Pre-ReDevelopment TN Load(Ib/yr) 11.05 (Past-ReDevelopment&New 13.99 Impervious) (b/yr) Land Cover Summary -Post Past -Development New Impervious New Impervious Cover 024 creel Rv(impervious) 0.95 Port -Development Treatment Valume 0.0190 (acrnft) Past -Development Treatment Volume (cubic 928 feet) Post -Development Tp O51 Wad (lb/yr) TP wad Reduction Required for New 0.42 .pervious Area (lb/vr) LD-229 STORM SEWER DESIGN COMPUTATIONS STORM FREQUENCY 10 PROJECT: Boars H.d LOCATION: Charlottesville COUNTY: Charlottesville Desiped by: MSK Checked by: JS UNITS ENGLISH PIPE NO. FROMPoWT TO POWT DRAIN. AREA 'A' 3 RUNOFF COEFF. C. C CA R Ef TOME M.W RAIN FALL IN B RMOFF INVERT ELEVATIONS LENGTH of Pipe FL 12 SLOPE FIXI U SIZE (D-s SpN14tt) a 14 SHAPE Number of Pipes Ce ih, CFS IS Friction Slope FUFL NORMAL FLOW FLOWp INCRE- NEW 5 ACCUM- ULATEO 6 L nd CFS To Q CFS 9 UPPER END 10 LOWER END II Deplbof Fk-,M FL Areeof Fkm An S9Ft H. FL Vn FV 16 En FL MCRE- ME.EMARK$Acre Mm.e 1]IS201 REFERENCE 1 STA. REFERENCE 2 STA 202 200 000 0W 041 5.9U 626 0W 256 554W 553W 20M OW500 12 Circular 1 2]3 OWCW 0]] 065 030 395 101 008203 2M 202 01] 099 015 041 588 482 0W 200 55410 55405 IOW OWSW 12 Circular 1 2]3 OWCW 0]3 061 0.M 3W 09] ON205 2W 2W 0W 0W 026 581 629 0W I6 55420 55410 20M OW5W 12 Circular 1 2]3 OWIW 056 046 02] 365 0J 00920] 208 206 025 090 023 026 5.36 643 0W I6 554.M 554m 100W OW5W 12 Circular 1 2]3 OWIW 056 046 02] 365 0.]I 0'k209 210 208 004 0" 003 003 529 645 0W 020 55480 554.'N 20M OW5W 8 Circular 1 093 0M30 021 010 012 214 028 016211 212 214 001 035 0W OW 516 649 OW 003 5R% 5548020WOWAD 8 Circular 1 093 0W 008 002 005 122 010 02]21314212 001 035 0W OW654 QW 001 555W SS4.W 20W OWSW 8 Circular 1 093 OW000 0W 001 004 102 00] 0331 IX2 30D 0W 0W 051 501 654 OW 335 54255 541.W 36W 0=33 15 Circular 1 921 OW280052049028691126 009IX] 1W 16100 4 1016 068 0]5 051 051 5W 654 OW 335 54956 544.92 2135 021]33 8 Circular 1 610 OW880 0350190F]1Z905J3 002 USDA United States Department of Agriculture N RCS 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 December 23, 2022 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.................................................................................... How Soil Surveys Are Made .................................................. SoilMap.................................................................................. SoilMap............................................................................... Legend................................................................................. MapUnit Legend.................................................................. Map Unit Descriptions.......................................................... Albemarle County, Virginia ............................................... 4D—Ashe loam, 15 to 25 percent slopes ...................... 1913—Minnieville loam, 2 to 7 percent slopes ............... 19C—Minnieville loam, 7 to 15 percent slopes ............. References............................................................................. ............ 2 .............5 ............ 8 .............9 ...........10 .......... 11 ...........11 ...........13 ...........13 .......... 14 .......... 15 ...........17 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. 3 Z5 N y G use 3 2'M"N Custom Soil Resource Report Soil Map m N it N• .t this scale. 718 715 715M 71SM 3 Map Smle: 1:1,200 (prilltd m A ppba►(8.5' x ll") sheet Mn N 0 15 30 80 90 Areet 0 5D 700 210 300 MP PmJcbm: Web Melomr Cml wwdnab�:WGS84 Edgetis: lllM Zme 17N WGS84 9 I TI5B50 W 2'SYN T d ZM N 7 W 3 6Y MAPLEGEND Area of Interest (AOO 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: Jun 8, 2020--Sep 23, 2020 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 40 Ashe loam, 15 to 25 percent slopes 0.1 2.2% 19B Minnieville loam, 2 to 7 percent slopes 1.4 36.3% 19C Minnieville loam, 7 to 15 percent slopes 2.3 61.5% Totals for Area of Interest 3.8 100.0% 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 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 11 Custom Soil Resource Report 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 4D—Ashe loam, 15 to 25 percent slopes Map Unit Setting National map unit symbol: kbcl Elevation: 380 to 1,970 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 Ashe and similar soils: 80 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Ashe Setting Landform: Mountain slopes Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Parent material: Residuum weathered from granite and gneiss Typical profile H1 - 0 to 10 inches: loam H2 - 10 to 19 inches: loam H3 - 19 to 24 inches: sandy loam H4 - 24 to 79 inches: bedrock Properties and qualities Slope: 15 to 25 percent Depth to restrictive feature: 20 to 40 inches to lithic bedrock Drainage class: Somewhat excessively drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Very low to high (0.00 to 5.95 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: Low (about 3.2 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 6e Hydrologic Soil Group: B Ecological site: F148XY021 PA - Dry, Piedmont - felsic, Upland, Mixed Oak Heath / Oak -Pine Woodland Hydric soil rating: No 13 Custom Soil Resource Report 1913—Minnieville loam, 2 to 7 percent slopes Map Unit Setting National map unit symbol: 2v7hq 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: All areas are prime farmland Map Unit Composition Minnieville and similar soils: 80 percent Estimates are based on observations, descriptions, and transacts of the mapunit. Description of Minnieville 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 acid and basic igneous rock Typical profile Ap - 0 to 8 inches: loam Bt - 8 to 60 inches: clay C - 60 to 67 inches: clay Cr- 67 to 79 inches: bedrock Properties and qualities Slope: 2 to 7 percent Depth to restrictive feature: 60 to 120 inches to paralithic bedrock Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Very low to moderately high (0.00 to 0.20 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 7.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 2e Hydrologic Soil Group: B Ecological site: F148XY026PA - Moist, High Base -Saturation, Upland, Mixed Oak - Hickory - Conifer Forest Hydric soil rating: No 14 Custom Soil Resource Report 19C—Minnieville loam, 7 to 15 percent slopes Map Unit Setting National map unit symbol: 2v7hr 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: Farmland of statewide importance Map Unit Composition Minnieville and similar soils: 80 percent Estimates are based on observations, descriptions, and transacts of the mapunit. Description of Minnieville 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 acid and basic igneous rock Typical profile Ap - 0 to 8 inches: loam Bt - 8 to 60 inches: clay C - 60 to 67 inches: clay Cr- 67 to 79 inches: bedrock Properties and qualities Slope: 7 to 15 percent Depth to restrictive feature: 60 to 120 inches to paralithic bedrock Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Very low to moderately high (0.00 to 0.20 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 7.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 3e Hydrologic Soil Group: B Ecological site: F148XY026PA - Moist, High Base -Saturation, Upland, Mixed Oak - Hickory - Conifer Forest Hydric soil rating: No 15 Custom Soil Resource Report 16 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 W1 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 18 12/23/22, 12:00 PM Precipitation Frequency Data Server NOAA Atlas 14, Volume 2, Version 3 ANLocation name: Charlottesville Virginia, USA`s.,,,,, -- Latitude: 38.0463°, Longitude:-78.5394° Elevation: 555.89 fr* "source: ESRI Maps Af "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 25 501 100 200 500 1000 5-min (0.3116-0.390) (0.307 .419 0.465) (0.443-0.545) (04 960611) (0.556-0686) (0.02-0.6745) (0.643-0.800) (0.681-0853) (0: 23-0.919) (0.756- 974) 10-min (0.05-0.623) (0.605-0..744) (0.709-0872) (07 940978) (0.886-1.09) (0.959-18.19) (1.02-11527) (1.08-21335) 1 (1: 4?45) 1 (1: 9-1.53) 1.73 15-min (0.632-0779) (0.7 00.935) (0. 999610) (1.00.?24) (1. 2-21639) (1.2-31650) (1.29-11..61) (1.36515.71) (1.44i83) (1.501.93) 30-min (08 66-1.07) 1 (1.05-1..29) 1 (1.2 Az57) 1 (1.46- .79) 1 (1.66-2.05) 1 (1.83 2.26) 1 (1.98 2346) 1 (2. 2-2'66) 1 (22 9-2.91) 1 (2.42312) 1.81 60-min (1.o8-1.33) (1.32-11..62) (1.632.01) (1.89-20) (2.22�-2.74) (2.93.07) (2. 2 3a39) 1 (2.97-3.73) 1 (32 9-4.18) (3. 3-4.55) 2-hr (1.26- 65) (1.53-1.99) (1.92249) (22 5-2.92) (2.67347) (3.013.93) (3.35�99) (3. 0-4389) (4.175359) (4. 5-6.18) 3-hr (1.38-1.81) (1.67220) (2.09-2.75) (2.443.21) (2. 035.82) (3.274.33) (3.65-4.86) (4. 375.41) (4.546.18) (4.96�84) 6-hr (179- 28) (2: 5-2.76) (2.67-3.42) (3.134.02) (3744.83) (4. 55.52) (4. 8-6.26) (5. 3-7807) (6.09-8.21) (6749.23) 2. 11.3 12-hr (22 4P�.91) (2.73137.51) (3.374.38) (3.975317) (4.0526) (5. 9--37824) (6. 28331) (7.019647) (8.14--1.2) (9.11-12.8) 24hr (2.74340) (3.32�12) (4.25.25) (4.97--�6.19) (6.07--87358) (6.08.77) (7. 8-110.1) (9.0411.5) (10.6- 3.7) (11915.6) 2-0ay (3.224.00) (3.91�585) (49 58.16) (5.81-07.24) (7.028.78) (8.00--010.1) (9.06- 1.5) (102- 3.1) (11.8-15.4) (131515.3) 3.82 4.63 5.88 6.90 8AO 9.64 11.0 12.5 14.6 16.4 3-0ey (3.47-4.2) (4.20-5.12) (5.338.50) (6.247.62) (7.55-9.25) (8.61-10.6) (9.75-12.1) (11.0-13.7) (12.7-16.1) (14.1-18.1) (3.72445) (4. 05'38) (5.7618.83) (6.68-8.00) (8.99972) (9.23-121.2) (10.4-2.7) (11.7---14A) (13.6- 6.9) (15'1-19.0) 18.6 7-0ey (4.33-5.12) (5. 2516) (6. 0--07870 (7.55-8.96) (9.0410.8) (102- 2.3) (11.5- 3.9) (128-15.6) (1476- 8.2) (162- 0.3) '�� (4.93-5.76) (5.92591) (7.308.53) (8.41 984) (9.95- 1.7) (112?13.2) (125-14.8) (13'8-16.5) (15.6- 9.0) 19.3 (171-21.0) 0749) 4.8 20-dey (6.57- (7.848.93) (9.45-10.8) (107- 2.2) (12.414.2) (137- 5.8) (15.0-127.4) (16' 3 9.0) (18.1--21.3) (19.5- 3.1) 30-0ey (8: 0-9.14) (9.60. 0.8) (11.3-12.8) (1273--14.3) (14.416.3) (15.6-17.8) (16.9-19.2) (18'1- 0.7) (19.6- 2.6) (20?8-24.1) 10.7 12.7 14.8 16.4 18.4 20.0 21.4 22.8 24.7 26.0 45-day (10.1-11.4) (12.0-13.4) (14.0-15.7) (15.5-17.3) (17.419.5) (18.8-21.1) (20.1-2.7) (21.0.24.2) (2.9-26.2) (24.1-27.7) 60-day 8. (11913.3) (140..5.6) (162-18.0) (178- 9.8) (198�2.1) (213? 3.8) (2325.4) (240-270) (25.6- 9.0) (26?8- 0A) 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 https://hdsc.nws.noaa.govlhdsc/pfds/pfds_Printpage.html?lat=38.0463&Ion=-78.5394&data=depth&units=english&series=pds 1/4 12/23/22, 12:00 PM Precipitation Frequency Data Server PDS-based depth -duration -frequency (DDF) curves Latitude: 38.0463",Longitude: -78.53940 Lim 25 c L 20 y 10 a c 5 f7 C C E E t t t L L A Mrs rs r0 N r0 r0 r0 r0 N E r' Ak6 r� N �+ d mo v vr�i a LAO rYi $ N .. iv o Duration 31 IF t 21 Average recurrence interval (years) NOAA Atlas 14, Volume 2, Version 3 Created (GMT): Fri Dec 23 17:00:30 2022 Back to Top Maps & aerials Small scale terrain Average recurrence rntenal (years) — 1 2 — 5 10 25 60 100 200 — 600 1000 Duration 5-min — 2-day — 10-mm — 3-day 15imrn — 4-day — 3O-min — 7-day — 60inrn — 10-0ay — 2-hr — 20-day — 3-hr — 30-0ay — 6-hr — 45-day — 12-hr — 60-day — 24fir hfps://hdsc.nws.noaa.govlhdsc/pfds/pfds_printpage.html?lat=38.0463&Ion=-78.5394&data=depth&units=english&series=pds 214 12/23/22, 12:00 PM Precipitation Frequency Data Server Large scale terrain mb�,A \ Washington, D.C.' .a \ Harrisonburg. 5 nuntonI .VIRGINIA IA f. Richr �I • ULynchburg ml *It, T Mnrin Large scale map wasFifngton ° Harrisonburg SlauitLn I I• I Lynchburg Blacksburg ; Roanoke 100km 60mi Large scale aerial Vort hftps://hdsc.nws.noaa.govlhdsc/pfds/pfds_printpage.html?lat=38.0463&Ion=-78.5394&data=depth&units=english&series=pds 314 12/23/22, 12:00 PM 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 knoa".ov Disclaimer hftps://hdsc.nws.noaa.govlhdsc/pfds/pfds_printpage.html?lat=38.0463&Ion=-78.5394&data=depth&units=english&series=pds 414