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Home My WebLink AboutSW1240602_Design Calculations_20240617 STORMWATER MANAGEMENT PLAN REVIEW PACKAGE 05/13/2024 4 cq R �PP1DSCq�O� ``CC `Z.w O n * ;; 1542 .........•.�JV: F TABLE OF CONTENTS PROJECT DESCRIPTION EXHIBIT A- USGS 7.5 MIN. TOPO EXHIBIT B - SOIL DATA (NRCS) EXHIBIT C - RAIN DATA EXHIBIT D -TR-55 REPORTS (PEAK FLOW) EXHIBIT E - CALCULATIONS - SEDIMENT TRAP AND DISSIPATION PAD SIZING - SCM SIZING & STORAGE VOLUME - TREATMENT & ATTENUATION - WEIR/ORIFACE SIZING & DRAWDOWN - PIPE SIZING - SWALE STABILIZATION EXHIBIT F - DEED PROJECT DESCRIPTION PROJECT NAME: JACKSON COUNTY SPLASH PAD PROJECT LOCATION: 335 Frank Allen Road, Cashiers, NC 28717 JACKSON COUNTY PROPERTY PIN(S): 7572119090 LATITUDE: 35° 6' 43.5" N LONGITUDE: -83°6' 26.2"W RECEIVING WATERS: CHATTOOGA RIVER, SAVANNA RIVER BASIN CONTACT FOR MAINTENANCE: DARLENE FOX, 828.586.4055, DARLENEFOX@JACKSONNC.ORG NARRATIVE: Jackson County is improving a portion of the park located in the Cashiers/Glenville Recreation Center. The existing park area slated for improvements under the Cashiers/Glenville Recreation Center Master Plan include the failing tennis courts and failing pool. This area is in need of stormwater and circulation improvements in addition to the community requested splash pad. Park improvements include replacing the (2) failing tennis courts with (1) new tennis court, (1) new basketball court and (2) new pickleball courts, replacing the existing playground with a newer structure and rubberized surface, and replacing the failing pool and pool building with a splash pad, restroom and shelter. In the existing condition, most of the stormwater flowing off of the project area originates on the project area with some water flowing from a few residential properties to the south. The water flows off the project area into a couple of stormwater catchments that then release the water into a tributary of the Chattooga River and then flows into Cashiers Lake. There is no existing stormwater feature. The waters described above are classified as Outstanding Resource Waters (ORW). In the proposed condition, the stormwater from the large majority of the project's area is directed to a constructed wetland. The constructed wetland is designed to treat 1" off all impervious surfaces contributing and attenuate peak storm flow for the 1yr-1hr storm as required, although the design far exceeds these requirements in an effort to not just attenuate peak flow for new BUA, but rather all BUA. Due to the incredible qualities of the waters of this watershed, Equinox Environmental is proposing a stormwater treatment design (constructed wetland) that best mimics the existing regional condition and treats at a minimum the required volume of water, however, is sized to treat as much as the available space would allow. Efforts were made to capture as much of the impervious surface as possible. As seen on the stormwater plan, on sheet L4.0, stormwater is conveyed through a series of planted swales to the constructed wetland. The swales are heavily planted and calculated to be stable above a 50yr-24hr storm. Water is collected in the forebay, and overflows into the wetland through a weir structure sized to accommodate the 50yr storm. The outflow of SCM1 is opposite the inflow to maximize residency time. SCM1 is designed and planted to maximize treatment, including efforts to extend the hydrologic flow path (See stormwater sheets and details). SCM1 and the feeding swale were designed to maximize all available space and collect and treat stormwater sheet flow as early as possible. The outflow device is sized to draw down the treatment volume of the wetland over 72 hours and with an overflow weir sized to accommodate the 50yr-24hr storm. The outflow device is tied to the existing storm drain system as described in the existing condition. EXHIBIT A — USGS MAP N-------, in.,;( _.),-.7 AlLIK, 441 ( _____ }7._-___-..-__----1-7-\. 1/4 (--- tc,_; ' Ir . , \\\\* . , 1- . --171. -- , \ , , 4, „,,)(1..,,,,iit ,, _ ----__ ,, NANTAHALA7 NATIONAL , -' _ FOREST > r---,-- ___, - "a': I 1 , ,. 1 Gi PROJECT AREAo Cashiers Lake ashlers • j _ Soil Map—Jackson County, North Carolina EXHIBITB - SOIL DATA 307820 307840 307860 307880 307900 307920 307940 307960 307980 308W0 35°6'44"N — I I - 35°6'44"N / r • • • p dD r --:41' 4 ,I,,,i "X..„ , . rir" , • As ' mat of/ems '7/41. ~` '� 10 III r / (7 WtB r11111 / . q )' • ) N • ud • 1 I*Of' '-. • 7)C•S1GdZIp Ell-RP:soti b(N da0od�sj is�r I ° :. • , N .rr 35°6'40"N grip ` • 35°6'40"N 307820 307840 307860 3)P8a0 307900 307920 307940 307960 307980 308000 3 3 ro Map Scale:1:902 if printed on A landscape(11"x 8.5")sheet. ro Meters N 0 N 0 10 20 40 60 Feet A 0 0 40 80 160 240 Map projection:Web Mercator Comer coordinates:WGS84 Edge tics:UTM Zone 17N WGS84 USDA Natural Resources Web Soil Survey 5/11/2023 Conservation Service National Cooperative Soil Survey Page 1 of 3 Soil Map—Jackson County,North Carolina MAP LEGEND MAP INFORMATION Area of Interest(AOI) A Spoil Area The soil surveys that comprise your AOI were mapped at ILI Area of Interest(AOI) 1:12,000. Q StonySpot Soils42) Very Stony Spot Warning:Soil Map may not be valid at this scale. 0 Soil Map Unit Polygons Wet Spot Enlargement of maps beyond the scale of mapping can cause .rr Soil Map Unit Lines misunderstanding of the detail of mapping and accuracy of soil Other line placement.The maps do not show the small areas of p Soil Map Unit Points contrasting soils that could have been shown at a more detailed Special Line Features Special Point Features scale. (v Blowout Water Features Streams and Canals Please rely on the bar scale on each map sheet for map ra Borrow Pit measurements. Transportation M Clay Spot Rails Source of Map: Natural Resources Conservation Service 0 Closed Depression Web Soil Survey URL: pi/ Interstate Highways Coordinate System: Web Mercator(EPSG:3857) X Gravel Pit US Routes oio Maps from the Web Soil Survey are based on the Web Mercator Gravelly Spot Major Roads projection,which preserves direction and shape but distorts distance and area.A projection that preserves area,such as the 0 Landfill Local Roads Albers equal-area conic projection,should be used if more Lava Flow accurate calculations of distance or area are required. t Background 4116, Marsh or swamp Aerial Photography This product is generated from the USDA-NRCS certified data as of the version date(s)listed below. iye Mine or Quarry Soil Survey Area: Jackson County,North Carolina O Miscellaneous Water Survey Area Data: Version 19,Sep 8,2022 Q Perennial Water Soil map units are labeled(as space allows)for map scales y Rock Outcrop 1:50,000 or larger. Saline Spot Date(s)aerial images were photographed: Mar 30,2021—Apr 4, 2021 Sandy Spot The orthophoto or other base map on which the soil lines were Severely Eroded Spot compiled and digitized probably differs from the background imagery displayed on these maps.As a result,some minor 0 Sinkhole shifting of map unit boundaries may be evident. Slide or Slip Sodic Spot 7\ Natural Resources Web Soil Survey 5/11/2023 i Conservation Service National Cooperative Soil Survey Page 2 of 3 Soil Map—Jackson County,North Carolina Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI EdD Edneyville-Chestnut complex, 0.0 0.3% high precipitation, 15 to 30 percent slopes,stony Ud Udorthents,loamy 1.0 54.7% WtB Whiteside-Tuckasegee 0.8 45.0% complex,2 to 8 percent slopes Totals for Area of Interest 1.9 100.0% USDA Natural Resources Web Soil Survey 5/11/2023 Conservation Service National Cooperative Soil Survey Page 3 of 3 Map Unit Description:Whiteside-Tuckasegee complex,2 to 8 percent slopes---Jackson County, North Carolina Jackson County, North Carolina WtB—Whiteside-Tuckasegee complex, 2 to 8 percent slopes Map Unit Setting National map unit symbol: Icb8 Elevation: 1,700 to 4,800 feet Mean annual precipitation: 45 to 65 inches Mean annual air temperature: 46 to 57 degrees F Frost-free period: 100 to 150 days Farmland classification: All areas are prime farmland Map Unit Composition Tuckasegee and similar soils:45 percent Whiteside and similar soils:40 percent Minor components: 5 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Tuckasegee Setting Landform: Coves on mountain slopes, drainageways on mountain slopes, fans on mountain slopes Landform position (two-dimensional): Footslope, toeslope Landform position (three-dimensional): Mountainbase, base slope Down-slope shape: Concave Across-slope shape: Concave Parent material: Colluvium derived from igneous and metamorphic rock Typical profile A -0 to 13 inches: fine sandy loam Bw1 - 13 to 26 inches: fine sandy loam Bw2-26 to 47 inches: cobbly sandy clay loam BC-47 to 80 inches: cobbly sandy clay loam Properties and qualities Slope: 2 to 8 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): High (1.98 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: Moderate (about 8.9 inches) Interpretive groups Land capability classification (irrigated): None specified USDA Natural Resources Web Soil Survey 5/11/2023 Conservation Service National Cooperative Soil Survey Page 1 of 3 Map Unit Description:Whiteside-Tuckasegee complex,2 to 8 percent slopes---Jackson County, North Carolina Land capability classification (nonirrigated): 2e Hydrologic Soil Group: A Ecological site: F130BY005WV- Mesic Colluvium Cool Aspect Hydric soil rating: No Description of Whiteside Setting Landform: Coves on mountain slopes, drainageways on mountain slopes, fans on mountain slopes Landform position (two-dimensional): Footslope, toeslope Landform position (three-dimensional): Mountainbase, base slope Down-slope shape: Concave Across-slope shape: Concave Parent material: Colluvium derived from igneous and metamorphic rock Typical profile Ap- 0 to 14 inches: fine sandy loam Bt- 14 to 47 inches: sandy clay loam Cg-47 to 80 inches: sandy clay loam Properties and qualities Slope: 2 to 8 percent Depth to restrictive feature: More than 80 inches Drainage class: Moderately well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 1.98 in/hr) Depth to water table:About 24 to 36 inches Frequency of flooding: None Frequency of ponding: None Available water supply, 0 to 60 inches: High (about 9.9 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 2w Hydrologic Soil Group: C Ecological site: F130BY005WV- Mesic Colluvium Cool Aspect Hydric soil rating: No Minor Components Sylva, undrained Percent of map unit: 5 percent Landform: Drainageways on depressions Landform position (two-dimensional): Footslope, toeslope Landform position (three-dimensional): Mountainbase, base slope Down-slope shape: Linear, concave Across-slope shape: Concave USDA Natural Resources Web Soil Survey 5/11/2023 Conservation Service National Cooperative Soil Survey Page 2 of 3 Map Unit Description:Whiteside-Tuckasegee complex,2 to 8 percent slopes---Jackson County, North Carolina Hydric soil rating: Yes Data Source Information Soil Survey Area: Jackson County, North Carolina Survey Area Data: Version 19, Sep 8, 2022 USDA Natural Resources Web Soil Survey 5/11/2023 alli Conservation Service National Cooperative Soil Survey Page 3 of 3 Map Unit Description: Udorthents,loamy---Jackson County, North Carolina Jackson County, North Carolina Ud—Udorthents, loamy Map Unit Setting National map unit symbol: Ic9x Elevation: 1,150 to 6,180 feet Mean annual precipitation: 48 to 60 inches Mean annual air temperature: 46 to 57 degrees F Frost-free period: 116 to 170 days Farmland classification: Not prime farmland Map Unit Composition Udorthents, loamy, and similar soils: 90 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Udorthents, Loamy Setting Landform position (two-dimensional): Backslope Landform position (three-dimensional): Side slope Down-slope shape: Linear, convex Across-slope shape: Convex Parent material: Loamy and stony mine spoil or earthy fill derived from metamorphic rock Typical profile C- 0 to 80 inches: sandy clay loam Properties and qualities Slope: 2 to 50 percent Surface area covered with cobbles, stones or boulders: 0.1 percent Depth to restrictive feature: More than 80 inches Drainage class:Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Moderately low to very high (0.06 to 19.98 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 7.2 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7e Hydrologic Soil Group: C Ecological site: F130BY012WV- Non-Hydric Floodplains USDA Natural Resources Web Soil Survey 5/11/2023 Conservation Service National Cooperative Soil Survey Page 1 of 2 Map Unit Description: Udorthents,loamy---Jackson County, North Carolina Hydric soil rating: No Data Source Information Soil Survey Area: Jackson County, North Carolina Survey Area Data: Version 19, Sep 8, 2022 USDA Natural Resources Web Soil Survey 5/11/2023 Conservation Service National Cooperative Soil Survey Page 2 of 2 1/30/24, 10:10 AM Precipitation Frequency Data Server NOAA Atlas 14,Volume 2,Version 3 ,860;°`C\ Location name:Cashiers,North Carolina, USA* '�� ' X % Latitude:35.1119°, Longitude:-83.1077° noon 1,7 Elevation:3498 ft** *source:ESRI Maps 'a p EXHIBIT C - RA N DATA **source:USGS """` � POINT PRECIPITATION FREQUENCY ESTIMATES G.M.Bonnin,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)1 Average recurrence interval(years) Duration 1 _ 2 5 10 25 50 100 200 500 1000 5-min 0.438 0.522 0.613 0.692 0.789 0.868 0.946 1.02 1.13 1.22 (0.398-0.483) (0.474-0.575) (0.557-0.676) (0.626-0.762) (0.709-0.868) (0.775-0.958) (0.839-1.05) (0.901-1.14) (0.979-1.26) (1.04-1.38) 10-min 0.699 0.834 0.982 1.11 1.26 1.38 1.50 1.62 1.78 1.92 (0.636-0.771) (0.758-0.920) (0.891-1.08) (1.00-1.22) (1.13-1.38) _(1.23-1.53) (1.33-1.66), (1.43-1.81) (1.55-2.00) (1.64-2.17) 15-min 0.874 1.05 1.24 1.40 1.59 1.75 1.90 2.05 2.25 2.41 (0.794-0.963) (0.953-1.16) (1.13-1.37) (1.27-1.54) (1.43-1.75) (1.56-1.93) (1.68-2.10) (1.80-2.28) (1.95-2.52) (2.06-2.72) 30-min 1.20 I 1.45 1.76 2.03 2.36 2.64 2.91 3.19 3.58 3.90 (1.09-1.32) (1.32-1.60) (1.60-1.94) (1.84-2.23) (2.12-2.60) (2.35-2.91) (2.58-3.22) (2.81-3.55) (3.10-4.01) (3.34-4.41) 60-min 1.49 1.82 2.26 2.64 3.14 3.57 4.01 4.48 5.13 5.70 (1.36-1.65) i (1.65-2.00) (2.05-2.49) (2.39-2.91) (2.82-3.46) (3.19-3.94) (3.55-4.44)1 (3.94-4.98) (4.45-5.75) (4.88-6.44) 2-hr 1.76 2.13 2.64 3.09 3.69 4.21 4.75 5.34 6.18 6.94 (1.60-1.94) (1.94-2.35) (2.40-2.91) (2.80-3.40) (3.32-4.06) (3.76-4.64) (4.21-5.26) (4.69-5.93) (5.36-6.92) (5.93-7.83) 3-hr 1.97 2.38 I 2.93 3.44 4.14 4.76 5.42 6.14 7.21 8.18 (1.80-2.17) (2.17-2.62) (2.68-3.24) (3.12-3.78) (3.72-4.56) (4.24-5.25) (4.79-5.99) (5.37-6.83) (6.20-8.07) (6.94-9.24) 6-hr 2.73 3.27 3.98 4.63 5.55 6.38 7.28 8.28 9.78 11.2 (2.50-3.00) (3.00-3.60) (3.64-4.38) (4.21-5.09) (5.01-6.11) (5.71-7.03) (6.44-8.06) (7.24-9.21) (8.38-11.0) (9.40-12.6) 12-hr 3.79 4.55 5.51 6.37 7.52 8.52 9.58 10.7 12.4 13.9 (3.48-4.15) (4.18-4.98) (5.06-6.04) (5.82-6.98) (6.83-8.26) (7.68-9.38) (8.55-10.6) (9.47-11.9) (10.8-13.8) (11.9-15.7) 24-hr 4.92 5.90 7.26 I 8.35 9.87 11.1 12.4 1 13.8 15.8 17.4 (4.56-5.34) (5.46-6.40) (6.72-7.88) _(7.70-9.06) (9.05-10.7) (10.1-12.1) (11.2-13.5) (12.4-15.0) (14.0-17.3) (15.3-19.2) 2-day 6.02 7.20 8.77 10.0 11.8 13.2 14.7 16.2 18.5 20.3 (5.59-6.51) (6.68-7.78) (8.12-9.49) (9.26-10.9) (10.8-12.8) (12.1-14.3) (13.4-16.0) (14.7-17.8) (16.5-20.3) (17.9-22.5) 3-day 6.48 7.73 9.34 10.6 12.4 13.8 15.2 16.7 18.9 20.6 (6.04-6.98) (7.20-8.33) (8.68-10.1) (9.84-11.4) (11.4-13.3) (12.7-14.9) (13.9-16.5) (15.2-18.2) (17.0-20.7) (18.4-22.7) 4-day 6.95 8.26 9.90 11.2 12.9 14.3 15.8 17.2 19.3 21.0 (6.49-7.46) (7.72-8.87) (9.24-10.6) (10.4-12.0) (12.0-13.9) (13.3-15.4) (14.5-17.0) (15.8-18.7) (17.4-21.0) (18.8-23.0) 7-day 8.30 9.86 11.8 13.4 15.5 17.2 19.0 20.8 23.4 25.5 (7.74-8.94) (9.19-10.6) (11.0-12.7) (12.4-14.4) (14.4-16.7) (15.9-18.6) (17.4-20.5) (19.0-22.6) (21.1-25.4) (22.8-27.8) 10-day 9.60 11.4 13.5 15.2 17.5 19.3 21.2 23.1 25.8 27.9 (8.97-10.3) (10.6-12.2) (12.6-14.5) (14.1-16.3) (16.2-18.8) (17.9-20.8) (19.5-22.8) (21.2-25.0) (23.4-27.9) (25.1-30.4) 20-day 12.8 15.1 17.5 19.4 21.9 I 23.7 25.5 27.3 29.6 31.4 (12.1-13.7) (14.2-16.1) (16.5-18.7) l (18.3-20.7) (20.5-23.3) (22.2-25.2) (23.8-27.2) (25.4-29.2) (27.4-31.8) (28.9-33.8)i 30-day 15.6 18.3 20.9 22.9 25.4 27.3 29.0 30.7 32.9 34.5 (14.8-16.5) I (17.3-19.3) (19.8-22.1) (21.7-24.2) (24.0-26.9) (25.7-28.9) (27.3-30.8) (28.8-32.7) (30.7-35.0) (32.1-36.8) 45-day 19.7 23.1 26.0 28.2 30.7 32.6 34.3 35.8 37.7 39.1 (18.8-20.7) (22.0-24.3) I (24.7-27.3) (26.8-29.6) (29.2-32.3) (30.9-34.3) (32.4-36.1) (33.8-37.8) (35.5-39.9) (36.7-41.5) 60-day 23.6 27.5 30.8 33.1 35.9 37.8 39.6 41.2 43.1 44.4 (22.6-24.7) I (26.3-28.8) (29.4-32.2) (31.6-34.7) (34.2-37.6) (36.0-39.7) (37.6-41.6) (39.1-43.3) (40.8-45.4) (42.0-46.9) 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 NOAAAtlas 14 document for more information. Back to Top PF graphical https://hdsc.nws.noaa.gov/pfds/pfds_printpage.html?lat=35.1119&Ion=-83.1077&data=depth&units=english&series=pds#table 1/4 1/30/24, 10:10 AM Precipitation Frequency Data Server PDS-based depth-duration-frequency (DDF) curves Latitude: 35.1119', Longitude: -83.1077` Average recurrence interval 40 • (years) c — 1 y 30 - - • •- -, - — 2 a — 5 d.// a, -o — 10 ro 20 — 50 a — 100 L., — 200 r- 10 - � 500 — 1000 0 r—i I j . r r r r III II III C C C _ C I- I " a T T ?�>, >, >, >,?,_ _ _ •C •_ L .L - - -C r0 rp r0 r0 ra r0 rp r0 ra AE E E E E r� 6 r,, v v -a-o -0 •p v a -o-o '^ 0 $ $ Duration N "' n5 v r o 0 o u$ 40 -- c -- Duration Y 30 a)a — 5-min — 2-day -o c — 10-min — 3-day o ' 20 15-min — 4-day r0 o — 30-min — 7-day — 60-mrn — 10-day a) 6. a 10 — 2-hr — 20-day — 3ahr — 30-day — 6-hr — 45-day 0- — — 12-hr — 60-day ' ' ' ' 24-hr 1 2 5 10 25 50 100 200 500 1000 Average recurrence interval (years) NOAA Atlas 14,Volume 2,Version 3 Created(GMT):Tue Jan 30 15:09:39 2024 Back to Top Maps & aerials Small scale terrain https://hdsc.nws.noaa.gov/pfds/pfds_printpage.html?lat=35.1119&Ion=-83.1077&data=depth&units=english&series=pds#table 2/4 1/30/24, 10:10 AM Precipitation Frequency Data Server I. Cashiers hd/f 0 .c + 3km LI 2mi F. E Large scale terrain Johnson City' Win! Knoxville • I:u F.1ie-ri II •Asheville N ��F IChattanooga •Greenville 100km At i-ii • 60mi C01ui . Large scale map lohnson KnpgyJll ^1 - Asheville Is\ Gre- le �t U 100km Athens N y 60mi Large scale aerial https://hdsc.nws.noaa.gov/pfds/pfds_printpage.html?tat=35.1119&Ion=-83.1077&data=depth&units=english&series=pds#table 3/4 1/30/24, 10:10 AM Precipitation Frequency Data Server Johnson city Knoxville • 'Asheville • • • Chattanooga Greenville • 100km Athens Cc • 60mi 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.Questionsnoaa.gov Disclaimer https://hdsc.nws.noaa.gov/pfds/pfds_printpage.html?lat=35.1119&Ion=-83.1077&data=depth&units=english&series=pds#table 4/4 EXHIBIT D - TR55 (PEAK FLOW) REPORTS Jason Jackson-Splash Pad Jackson Valley NOAA County, North Carolina Hydrograph Peak/Peak Time Table Sub-Area Peak Flow and Peak Time (hr) by Rainfall Return Period or Reach 1-Yr Identifier (cfs) (hr) SUBAREAS POST-DEV. 17.57 11.93 PRE-QO 15.72 11.93 REACHES OUTLET 33.29 WinTR-55, Version 1.00.10 Page 1 2/27/2024 3:47:12 PM Jason Splash Pad sub watersheds Jackson Valley NOAA County, North Carolina Hydrograph Peak/Peak Time Table Sub-Area Peak Flow and Peak Time (hr) by Rainfall Return Period or Reach 25-Yr 50-Yr 1-Yr Identifier (cfs) (cfs) (cfs) (hr) (hr) (hr) SUBAREAS Sub A 3.44 3.94 1.38 11.93 11.93 11.93 Sub B 0.40 0.45 0.19 11.93 11.93 11.93 Sub C 1.34 1.51 0.63 11.93 11.93 11.93 Sub D 1.01 1.14 0.46 11.93 11.93 11.93 Sub E 2.57 2.90 1.17 11.93 11.93 11.93 Sub F 3.50 3.94 1.65 11.93 11.93 11.93 Sub H 18.92 21.69 7.46 11.98 11.98 12.00 REACHES OUTLET 29.93 34.19 12.32 WinTR-55, Version 1.00.10 Page 1 5/13/2024 4:07:52 PM Jason Splash Pad sub watersheds Jackson Valley NOAA County, North Carolina Hydrograph Peak/Peak Time Table Sub-Area Peak Flow and Peak Time (hr) by Rainfall Return Period or Reach 50-Yr Identifier (cfs) (hr) SUBAREAS swale A 3.94 11.93 swale B 1.04 11.93 swale C 1.67 11.93 swale D 1.51 11.93 swale E 9.39 11.93 swale F 0.45 11.93 swale G 0.54 11.93 swale H 0.72 11.93 swale I 0.71 11.93 swale J 0.73 11.93 swale K 21.69 11.93 REACHES OUTLET 42.38 WinTR-55, Version 1.00.10 Page 1 2/28/2024 12:16:46 PM EXHIBIT E - CALCULATIONS Sediment Trap Sizing Requirements 3600 cf/ac 435 sf/Qio 2:1 in dimension 3 baffles 3.5' min. in depth 1' in cut at min. stone spillway Sediment Trap 1 Disturbed acres: 1.2 ac Qio: 11.94 cfs Required volume: 4320 cf Required sq footage: 5194 sf Skimmer Size: 1.5" with .7" radius oriface, based on 3-day drawdown Dissipation Pad Sizing FOR METHOD SEE 8.06 OF NC EROSION AND SEDIMENT CONTROL PLANNING AND DESIGN MANUAL Volume Attenuation Runoff Treatment option for permitting. NRCS Curve Number method was used for all calculations Project Area: 78,358 sf Existing BUA: 23,490 sf Proposed BUA: 30,279 sf %Impervious 38.6 % gOtot= 15.72 gltot 17.57 Peak Flow(Q1): cfs Water not routed through SCM (post,Sub A-C,H) 9.67 For sizing SCM (requirement) g0max= 6.05 15.72 Peak flow SCM out(actual) q0= 6 Peak flow SCM in Post q1= 7.9 Calculating volume storage(volume match): V,=Vr(Vs/Vr ratio) V,/V,ratio=CO+C1(g0/q1)+C2(g0/g1)2+C3(g0/g1)3 Vr=Q*A Q* =(P-0.2S)2/(P+0.8S) P= 4.93 in q0/q1= 0.766 For Type II rainfall: CO= 0.682 C1= -1.43 C2= 1.64 C3= -0.804 Vs/Vr ratio= 0.1875969 Q*= 3.81 in Vr(cf)= 9,611 cf Vs(cf)= 1,803 cf SCM1(required storage) 1,803 cf Calculating volume treatment: S=(1000/CN)—10 S=Maximum retention after rainfall begins(in.) CN=Curve number(unitless) Q* =(P-0.2S)2/(P+0.8S) Q*=Runoff depth (in.) P=Rainfall depth (in.) V=(Q*(A))/12 imper.area= 30279 sf CN= 90 S= 1.111 in P= 1 in Q*= 0.320 in V= 808 cf w/15"treatment depth,treatment area= 646 sf Designed Storage SCM1 2,559 cf top 6" weir to drawdown at 6 cfs 1151 cf lower 6" oriface to drawdown over 72-120hours 3,710 Summary pre-development peak flow off-site 15.72cfs post-development peak flow off-site with SCM 15.67cfs s,/ required storage(1yr-24hr storm) 1,803cf designed storage 3,710cf s/ Constructed Stormwater Wetland Design&MDCs Design standard Calculated MDC 1: Temporary ponding depth of Max 15" 12" MDC 2: Attenuation storage in dry pond MDC 3: Surface area =volume/1.25 Min 732 sf actual 3,763 sf 3,763 sf MDC 4: Review of soil analysis is positive MDC 5: Maximum flow path MDC 6: Forebay to be 10-15% Min 376 sf 548 sf Max 564 sf MDC 7: Non-forebay deep pools to be 5-15% Min 188 sf 252 sf (to be at least 18"below permanent pool) Max 564 sf MDC 8: Shallow water zone to be 35-45% Min 1317 sf 1,651 sf (to be 0"-9"below permanent pool) Max 1,693 sf MDC 8: Inundation zone to be 30-45% Min 1129 sf 1312 sf (to be 0"-15"above permanent pool) Max 1,693 sf MDC 10: Drawdown time between Min 2 days 3 days Max 5 days MDC 11: Outfall is stable MDC:12: Met (see planting plan) MDC:13: Met (see planting plan) MDC:14: Met (see planting plan) MDC:15: Met (see planting plan and EC plan) MDC:16: No cattails MDC:17: Trash rack provided (see stormwater details) Orifice Sizing 1-yr(treatment) Q=CDA(2gHo)^0.5 Typical default C D=0.60 Q= Discharge (cfs) CD= Coefficient of discharge (unitless) A= Cross-sectional area of oriface (sq ft) g=Acceleration of gravity (32.2ft/sec^2) Ho= Driving head (usually us Ho/3 for drawdown to reflect lowering head) Wetland Drawdown Goal drawdown time (min) = 72hr 259,200 sec Volume= 1,151 cf Q= 0.0044 cfs CD= 0.60 g= 32.2 ft/sec^2 Ho/3= 0.6 ft A= 0.0011906 sf 0.1714482 in^2 diameter= 0.47 in 48hr drawdown time 172800 Volume= 1,151 cf Q= 0.0067 cfs CD= 0.60 g= 32.2 ft/sec^2 Ho/3= 0.6 ft A= 0.0017859 sf 0.2571723 in^2 diameter= 0.57 in Goal drawdown time (max)= 120hr 432,000 sec Volume= 1,151 cf Q= 0.0027 cfs CD= 0.60 g= 32.2 ft/sec^2 Ho/3= 0.6 ft A= 0.0007144 sf 0.1028689 in^2 diameter= 0.36 in diameter to be 0.36 < x < 0.57 Weir Sizing Q=CWLH^1.5 Broad crested Cw=3.0 Q= Discharge (cfs) Cw=Weir Coefficient (unitless) L= Length of weir(ft) H= Driving head (ft) 1-yr for final outfall 50-yr for W1 to pass 50 yr Q= 6 cfs Q= 24.96 cfs (Sub D+E+F) Cw= 3 Cw= 3 H= 1.5 ft H= 1 ft L= 1.1 ft L= 8.3 ft Pipe Sizing 25-yr *See TR-55 report for sub watershed flows *See watershed diagram for delineations Routing: Outfall Contribution Total flow(Q50) Pipe size Pipe 1 Sub A 3.94 cfs 18 in Pipe 2 Sub C 1.51 cfs 15 in Pipe 3 Sub B +C 1.96 cfs 15 in Pipe 4 Sub D 1.14 cfs 15 in Pipe 5 Sub D+ E 4.04 cfs 18 in Pipe 6 Sub D+ E + F 7.98 cfs 24 in Pipe 7/8 Sub D+ E + F+G 24.96 cfs 30 in Pipe Sizing: *See HY-8 for calculations HY-8 Analysis Results Culvert Summary Table - Pipe 1 Culvert Crossing: Pipe 1 Total Culvert Headwa Inlet Outlet Flow Normal Critical Outlet Tailwate Outlet Tailwate Dischar Dischar ter Control Control Type Depth Depth Depth r Depth Velocity r ge (cfs) ge (cfs) Elevatio Depth(ft)Depth(ft) (ft) (ft) (ft) (ft) (ft/s) Velocity n (ft) (ft/s) 2.81 2.81 1.90 0.90 0.0* 1-S2n 0.46 0.64 0.46 0.30 6.17 4.67 2.98 2.98 1.94 0.94 0.0* 1-S2n 0.47 0.66 0.48 0.31 6.18 4.76 3.15 3.15 1.97 0.97 0.0* 1-S2n 0.48 0.68 0.49 0.32 6.28 4.85 3.32 3.32 2.00 1.00 0.0* 1-S2n 0.50 0.69 0.50 0.34 6.47 4.94 3.49 3.49 2.03 1.03 0.0* 1-S2n 0.51 0.71 0.51 0.35 6.56 5.02 3.67 3.67 2.06 1.06 0.0* 1-S2n 0.52 0.73 0.52 0.36 6.65 5.10 3.84 3.84 2.09 1.09 0.0* 1-S2n 0.54 0.75 0.54 0.37 6.73 5.18 4.18 4.18 2.15 1.15 0.00 1-S2n 0.56 0.78 0.57 0.39 6.79 5.32 4.35 4.35 2.18 1.18 0.04 1-S2n 0.58 0.80 0.58 0.40 6.86 5.39 4.52 4.52 2.21 1.21 0.07 1-S2n 0.59 0.82 0.60 0.41 6.92 5.46 Crossing - Pipe 1 , Design Discharge - 3.9 cfs Culvert - Pipe 1, Culvert Discharge - 3.9 cfs 5.5 • 5.0- 4.5- 4.0-- 3.5- 0 3.0 co > - a) W 2.5 2.0- 1 .5- 1 .0- 0.5 -20 -10 0 10 20 30 40 50 60 70 80 Station (ft) HY-8 Analysis Results Culvert Summary Table - Pipe 2 Culvert Crossing: Pipe 2 Total Culvert Headwa Inlet Outlet Flow Normal Critical Outlet Tailwate Outlet Tailwate Dischar Dischar ter Control Control Type Depth Depth Depth r Depth Velocity r ge (cfs) ge (cfs) Elevatio Depth(ft)Depth(ft) (ft) (ft) (ft) (ft) (ft/s) Velocity n (ft) (ft/s) 1.12 1.12 0.77 0.57 0.24 1-S2n 0.29 0.42 0.31 0.18 4.68 4.17 1.18 1.18 0.78 0.58 0.25 1-S2n 0.30 0.43 0.32 0.18 4.73 4.25 1.24 1.24 0.80 0.60 0.27 1-S2n 0.31 0.44 0.33 0.19 4.78 4.32 1.30 1.30 0.81 0.61 0.28 1-S2n 0.31 0.45 0.34 0.20 4.83 4.39 1.36 1.36 0.83 0.63 0.29 1-S2n 0.32 0.46 0.35 0.20 4.88 4.46 1.42 1.42 0.85 0.65 0.31 1-S2n 0.33 0.47 0.36 0.21 4.93 4.53 1.47 1.47 0.86 0.66 0.32 1-S2n 0.33 0.48 0.36 0.21 4.97 4.59 1.59 1.59 0.90 0.70 0.34 1-S2n 0.35 0.50 0.38 0.23 5.06 4.71 1.65 1.65 0.91 0.71 0.36 1-S2n 0.35 0.51 0.39 0.23 5.10 4.77 1.71 1.71 0.93 0.73 0.37 1-S2n 0.36 0.52 0.40 0.24 5.14 4.83 Crossing - Pipe 2, Design Discharge - 1 .5 cfs Culvert - Pipe 2, Culvert Discharge - 1.5 cfs 3.5- • A 3.0- 2.5- c 2.0 o — co — a� w — 1 .5- 1.0— 0.5— ------- I I I -2 0 2 4 6 8 10 12 14 Station (ft) HY-8 Analysis Results Culvert Summary Table - Pipe 3 Culvert Crossing: Pipe 3 Total Culvert Headwa Inlet Outlet Flow Normal Critical Outlet Tailwate Outlet Tailwate Dischar Dischar ter Control Control Type Depth Depth Depth r Depth Velocity r ge (cfs) ge (cfs) Elevatio Depth(ft)Depth(ft) (ft) (ft) (ft) (ft) (ft/s) Velocity n (ft) (ft/s) 1.46 1.46 1.01 0.66 0.17 1-S2n 0.36 0.48 0.37 0.24 4.87 4.00 1.54 1.54 1.03 0.68 0.19 1-S2n 0.37 0.49 0.38 0.25 4.94 4.07 1.61 1.61 1.06 0.71 0.21 1-S2n 0.38 0.50 0.39 0.26 5.00 4.14 1.69 1.69 1.08 0.73 0.22 1-S2n 0.39 0.52 0.40 0.27 5.06 4.20 1.76 1.76 1.10 0.75 0.24 1-S2n 0.40 0.53 0.41 0.28 5.11 4.26 1.84 1.84 1.12 0.77 0.26 1-S2n 0.40 0.54 0.41 0.28 5.17 4.32 1.92 1.92 1.14 0.79 0.28 1-S2n 0.41 0.55 0.42 0.29 5.22 4.38 1.18 0.83 0.31 1-S2n 0.43 0.57 0.44 0.31 5.32 4.49 2.14 2.14 1.19 0.84 0.33 1-S2n 0.44 0.58 0.45 0.32 5.37 4.54 2.22 2.22 1.21 0.86 0.35 1-S2n 0.45 0.59 0.46 0.32 5.42 4.59 Crossing - Pipe 3, Design Discharge - 2.0 cfs Culvert - Pipe 3, Culvert Discharge - 2.0 cfs 3.5— • A 3.0— 2.5— 2.0 c� — a� — w — 1 .5- 1.0— --------------------- -------------- 0.5— 011 I I I I I -5 0 5 10 15 20 25 30 Station (ft) HY-8 Analysis Results Culvert Summary Table - Pipe 4 Culvert Crossing: Pipe 4 Total Culvert Headwa Inlet Outlet Flow Normal Critical Outlet Tailwate Outlet Tailwate Dischar Dischar ter Control Control Type Depth Depth Depth r Depth Velocity r ge (cfs) ge (cfs) Elevatio Depth(ft)Depth(ft) (ft) (ft) (ft) (ft) (ft/s) Velocity n (ft) (ft/s) 0.84 0.84 1.49 0.49 0.0* 1-S2n 0.27 0.36 0.27 0.17 4.38 3.31 0.89 0.89 1.50 0.50 0.0* 1-S2n 0.27 0.37 0.27 0.18 4.44 3.37 0.93 0.93 1.52 0.52 0.0* 1-S2n 0.28 0.38 0.28 0.18 4.51 3.43 0.98 0.98 1.53 0.53 0.0* 1-S2n 0.29 0.39 0.29 0.19 4.57 3.49 1.02 1.02 1.54 0.54 0.0* 1-S2n 0.29 0.40 0.29 0.19 4.63 3.55 1.07 1.07 1.55 0.55 0.0* 1-S2n 0.30 0.41 0.30 0.20 4.69 3.60 1.12 1.12 1.57 0.57 0.0* 1-S2n 0.31 0.42 0.31 0.20 4.75 3.65 1.21 1.21 ',.FQ 0.•=19 C.(I ':-S2n 0.32 0.43 0.32 0.21 4.86 3.75 1.25 1.25 1.60 0.60 0.0* 1-S2n 0.33 0.44 0.33 0.22 4.91 3.80 1.30 1.30 1.62 0.62 0.0* 1-S2n 0.33 0.45 0.33 0.23 4.96 3.85 Crossing - Pipe 4, Design Discharge - 1 . 1 cfs Culvert - Pipe 4, Culvert Discharge - 1.1 cfs 3.0— 2.5- 2.0— C 0 > 1 .5 a) w 1.0- 0.5— 0_1 I I l l I I I I l i l I I I I -20 -10 113 10 20 30 40 50 60 70 80 90 Station (ft) HY-8 Analysis Results Culvert Summary Table - Pipe 5 Culvert Crossing: Pipe 5 Total Culvert Headwa Inlet Outlet Flow Normal Critical Outlet Tailwate Outlet Tailwate Dischar Dischar ter Control Control Type Depth Depth Depth r Depth Velocity r ge (cfs) ge (cfs) Elevatio Depth(ft)Depth(ft) (ft) (ft) (ft) (ft) (ft/s) Velocity n (ft) (ft/s) 2.98 2.98 2.24 0.94 0.0* 1-S2n 0.52 0.66 0.52 0.49 5.49 3.04 3.14 3.14 2.27 0.97 0.0* 1-S2n 0.53 0.67 0.53 0.51 5.57 3.09 3.30 3.30 2.30 1.00 0.0* 1-S2n 0.55 0.69 0.55 0.53 5.65 3.13 3.46 3.46 2.33 1.03 0.0* 1-S2n 0.56 0.71 0.56 0.54 5.73 3.18 3.62 3.62 2.36 1.06 0.0* 1-S2n 0.58 0.73 0.58 0.56 5.80 3.22 3.79 3.79 2.39 1.09 0.0* 1-S2n 0.59 0.74 0.59 0.58 5.87 3.26 3.95 3.95 2.42 1.12 0.0* 1-S2n 0.60 0.76 0.60 0.60 5.93 3.31 4.27 4.27 2.47 1.17 0.0* 1-S2n 0.63 0.79 0.63 0.63 6.06 3.38 4.43 4.43 2.50 1.20 0.0* 1-S2n 0.64 0.81 0.64 0.65 6.12 3.42 4.59 4.59 2.53 1.23 0.0* 1-S2n 0.66 0.82 0.66 0.66 6.17 3.45 Crossing - Pipe 5, Design Discharge - 4.0 cfs Culvert - Pipe 5, Culvert Discharge - 4.0 cfs 3.5 • 3.0 2.5 2.0 1 .5 1.0- 0.5— -40 -20 0 20 40 60 80 100 120 140 160 Station (ft) HY-8 Analysis Results Culvert Summary Table - Culvert 1 Culvert Crossing: Pipe 6 Total Culvert Headwa Inlet Outlet Flow Normal Critical Outlet Tailwate Outlet Tailwate Dischar Dischar ter Control Control Type Depth Depth Depth r Depth Velocity r ge (cfs) ge (cfs) Elevatio Depth(ft)Depth(ft) (ft) (ft) (ft) (ft) (ft/s) Velocity n (ft) (ft/s) 5.91 5.91 1.52 1.22 0.65 1-S2n 0.62 0.86 0.67 0.35 6.42 2.79 6.22 6.22 1.56 1.26 0.69 1-S2n 0.63 0.88 0.69 0.37 6.50 2.84 6.54 6.54 1.60 1.30 0.72 1-S2n 0.65 0.91 0.71 0.38 6.57 2.89 6.85 6.85 1.64 1.34 0.76 1-S2n 0.67 0.93 0.73 0.39 6.64 2.94 7.16 7.16 1.68 1.38 0.79 1-S2n 0.68 0.95 0.75 0.40 6.71 2.99 7.47 7.47 1.71 1.41 0.82 1-S2n 0.70 0.97 0.76 0.41 6.78 3.04 7.79 7.79 1.75 1.45 0.86 1-S2n 0.71 0.99 0.78 0.42 6.85 3.09 8.41 8.41 1.82 1.52 0.93 1-S2n 0.74 1.03 0.82 0.44 6.97 3.18 8.73 8.73 1.85 1.55 0.96 1-S2n 0.76 1.05 0.83 0.45 7.03 3.22 9.04 9.04 1.89 1.59 1.00 1-S2n 0.77 1.07 0.85 0.46 7.09 3.26 Crossing - Pipe 6, Design Discharge - 8.0 cfs Culvert - Culvert 1, Culvert Discharge - 8.0 cfs 4.5 4.0- 3.5- 3.0 _ 0 2.5 > _ 2.0 1.5- 1 .0- 0.5- -5 0 5 10 15 20 25 Station (ft) HY-8 Analysis Results Culvert Summary Table - Culvert 1 Culvert Crossing: Pipe 7 Total Culvert Headwa Inlet Outlet Flow Normal Critical Outlet Tailwate Outlet Tailwate Dischar Dischar ter Control Control Type Depth Depth Depth r Depth Velocity r ge (cfs) ge (cfs) Elevatio Depth(ft)Depth(ft) (ft) (ft) (ft) (ft) (ft/s) Velocity n (ft) (ft/s) 5.91 5.91 1.40 1.10 0.54 1-S2n 0.57 0.80 0.62 0.35 6.25 2.79 8.21 8.21 1.62 1.32 0.73 1-S2n 0.67 0.95 0.74 0.43 6.73 3.15 10.50 10.50 1.84 1.54 0.90 1-S2n 0.76 1.08 0.85 0.51 7.12 3.44 12.80 12.80 2.04 1.74 1.08 1-S2n 0.84 1.20 0.95 0.58 7.45 3.70 15.09 15.09 2.23 1.93 1.26 1-S2n 0.92 1.31 1.05 0.64 7.74 3.92 17.38 17.38 2.41 2.11 1.44 1-S2n 1.00 1.41 1.14 0.70 8.01 4.12 19.68 19.68 2.58 2.28 1.62 1-S2n 1.07 1.51 1.22 0.76 8.26 4.31 21.97 21.97 2.76 2.46 1.81 1-S2n 1.13 1.59 1.30 0.82 8.50 4.47 26.57 28.86 128.86 13.34 13.04 2.43 I5-S2n 1.33 (1.83 11.53 0.98 19.17 14.91 Crossing - Pipe 7, Design Discharge - 25.0 cfs Culvert - Culvert 1, Culvert Discharge - 25.0 cfs 4.5 4.0 3.5 3.0 4— c 2.5 0 co 2.0 1 .5 1 .0- 0.5— -5 0 5 10 15 20 25 Station (ft) 2/28/24, 12:40 PM ECMDS 7.0 NORTH North American Green AMERICAN 5401 St. Wendel-Cynthiana Rd. Poseyville, Indiana 47633 GREEN Tel. 800.772.2040 >Fax 812.867.0247 www.nagreen.com ECMDS v7.0 CHANNEL ANALYSIS >>>swale a Name swale a Discharge 3.94 Channel Slope 0.024 Channel Bottom Width 1.5 Left Side Slope 4 Right Side Slope 4 Low Flow Liner Retardence Class C 6-12 in Vegetation Type Mix(Sod and Bunch) Vegetation Density Very Good 80-95% Soil Type Clay Loam(CL) Unreinforced Vegetation Normal Permissible Calculated Safety Staple Phase Reach Discharge Velocity Mannings N Remarks Depth Shear Stress Shear Stress Factor Pattern Unreinforced Straight 3.94 cfs 1.86 ft/s 0.56 ft 0.061 4 Ibs/ft2 0.85 lbs/ft2 4.73 STABLE Vegetation Underlying Straight 3.94 cfs 1.86 ft/s 0.56 ft 0.061 4 lbs/ft2 0.52 lbs/ft2 7.74 STABLE Substrate https://ecmds.com/project/159876/channel-analysis/260928/show 1/1 2/28/24, 12:42 PM ECMDS 7.0 NORTH North American Green AMERICAN 5401 St. Wendel-Cynthiana Rd. Poseyville, Indiana 47633 GREEN Tel. 800.772.2040 >Fax 812.867.0247 www.nagreen.com ECMDS v7.0 CHANNEL ANALYSIS >>>swale b Name swale b Discharge 1.04 Channel Slope 0.02 Channel Bottom Width 1.5 Left Side Slope 4 Right Side Slope 4 Low Flow Liner Retardence Class C 6-12 in Vegetation Type Mix(Sod and Bunch) Vegetation Density Very Good 80-95% Soil Type Clay Loam(CL) Unreinforced Vegetation Normal Permissible Calculated Safety Staple Phase Reach Discharge Velocity Mannings N Remarks Depth Shear Stress Shear Stress Factor Pattern Underlying Straight 1.04 cfs 1.05 ft/s 0.36 ft 0.077 4 Ibs/ft2 0.29 lbs/ft2 13.64 STABLE -- Substrate Unreinforced Straight 1.04 cfs 1.05 ft/s 0.36 ft 0.077 4 Ibs/ft2 0.45 Ibs/ft2 8.99 STABLE Vegetation https://ecmds.com/project/159876/channel-analysis/260929/show 1/1 2/28/24, 12:45 PM ECMDS 7.0 NORTH North American Green AMERICAN 5401 St. Wendel-Cynthiana Rd. Poseyville, Indiana 47633 GREEN Tel. 800.772.2040 >Fax 812.867.0247 www.nagreen.com ECMDS v7.0 CHANNEL ANALYSIS >>>swale c Name swale c Discharge 1.67 Channel Slope 0.027 Channel Bottom Width 1 Left Side Slope 3 Right Side Slope 3 Low Flow Liner Retardence Class C 6-12 in Vegetation Type Mix(Sod and Bunch) Vegetation Density Very Good 80-95% Soil Type Clay Loam(CL) Unreinforced Vegetation Normal Permissible Calculated Safety Staple Phase Reach Discharge Velocity Mannings N Remarks Depth Shear Stress Shear Stress Factor Pattern Unreinforced Straight 1.67 cfs 1.6 ft/s 0.45 ft 0.064 4 Ibs/ft2 0.75 lbs/ft2 5.33 STABLE -- Vegetation Underlying Straight 1.67 cfs 1.6 ft/s 0.45 ft 0.064 4 lbs/ft2 0.46 lbs/ft2 8.71 STABLE Substrate https://ecmds.com/project/159876/channel-analysis/260930/show 1/1 2/28/24, 12:45 PM ECMDS 7.0 NORTH North American Green AMERICAN 5401 St. Wendel-Cynthiana Rd. Poseyville, Indiana 47633 GREEN Tel. 800.772.2040 >Fax 812.867.0247 www.nagreen.com ECMDS v7.0 CHANNEL ANALYSIS >>>swale d Name swale d Discharge 1.51 Channel Slope 0.057 Channel Bottom Width 2 Left Side Slope 3 Right Side Slope 3 Low Flow Liner Retardence Class C 6-12 in Vegetation Type Mix(Sod and Bunch) Vegetation Density Very Good 80-95% Soil Type Clay Loam(CL) Unreinforced Vegetation Normal Permissible Calculated Safety Staple Phase Reach Discharge Velocity Mannings N Remarks Depth Shear Stress Shear Stress Factor Pattern Underlying Straight 1.51 cfs 2.18 ft/s 0.25 ft 0.054 4 Ibs/ft2 0.69 lbs/ft2 5.82 STABLE Substrate Unreinforced Straight 1.51 cfs 2.18 ft/s 0.25 ft 0.054 4 Ibs/ft2 0.9 lbs/ft2 4.47 STABLE Vegetation https://ecmds.com/project/159876/channel-analysis/260932/show 1/1 2/28/24, 12:47 PM ECMDS 7.0 NORTH North American Green AMERICAN 5401 St. Wendel-Cynthiana Rd. Poseyville, Indiana 47633 GREEN Tel. 800.772.2040 >Fax 812.867.0247 www.nagreen.com ECMDS v7.0 CHANNEL ANALYSIS >>>swale e Name swale e Discharge 9.39 Channel Slope 0.026 Channel Bottom Width 1 Left Side Slope 3 Right Side Slope 3 Low Flow Liner Retardence Class C 6-12 in Vegetation Type Mix(Sod and Bunch) Vegetation Density Very Good 80-95% Soil Type Clay Loam(CL) Unreinforced Vegetation Normal Permissible Calculated Safety Staple Phase Reach Discharge Velocity Mannings N Remarks Depth Shear Stress Shear Stress Factor Pattern Underlying Straight 9.39 cfs 2.9 ft/s 0.88 ft 0.051 4 Ibs/ft2 0.8 Ibs/ft2 5.03 STABLE Substrate Unreinforced Straight 9.39 cfs 2.9 ft/s 0.88 ft 0.051 4 Ibs/ft2 1.44 Ibs/ft2 2.79 STABLE Vegetation https://ecmds.com/project/159876/channel-analysis/260934/show 1/1 2/28/24, 12:49 PM ECMDS 7.0 NORTH North American Green AMERICAN 5401 St. Wendel-Cynthiana Rd. Poseyville, Indiana 47633 GREEN Tel. 800.772.2040 >Fax 812.867.0247 www.nagreen.com ECMDS v7.0 CHANNEL ANALYSIS >>>swalef Name swale f Discharge 0.45 Channel Slope 0.026 Channel Bottom Width 1 Left Side Slope 4 Right Side Slope 4 Low Flow Liner Retardence Class C 6-12 in Vegetation Type Mix(Sod and Bunch) Vegetation Density Very Good 80-95% Soil Type Clay Loam(CL) Unreinforced Vegetation Normal Permissible Calculated Safety Staple Phase Reach Discharge Velocity Mannings N Remarks Depth Shear Stress Shear Stress Factor Pattern Underlying Straight 0.45 cfs 0.9 ft/s 0.25 ft 0.08 4 Ibs/ft2 0.26 lbs/ft2 15.11 STABLE -- Substrate Unreinforced Straight 0.45 cfs 0.9 ft/s 0.25 ft 0.08 4 Ibs/ft2 0.41 Ibs/ft2 9.87 STABLE -- Vegetation https://ecmds.com/project/159876/channel-analysis/260935/show 1/1 2/28/24, 12:50 PM ECMDS 7.0 NORTH North American Green AMERICAN 5401 St. Wendel-Cynthiana Rd. Poseyville, Indiana 47633 GREEN Tel. 800.772.2040 >Fax 812.867.0247 www.nagreen.com ECMDS v7.0 CHANNEL ANALYSIS >>>swale G Name swale G Discharge 0.54 Channel Slope 0.036 Channel Bottom Width 1.5 Left Side Slope 4 Right Side Slope 4 Low Flow Liner Retardence Class C 6-12 in Vegetation Type Mix(Sod and Bunch) Vegetation Density Very Good 80-95% Soil Type Clay Loam(CL) Unreinforced Vegetation Normal Permissible Calculated Safety Staple Phase Reach Discharge Velocity Mannings N Remarks Depth Shear Stress Shear Stress Factor Pattern Underlying Straight 0.54 cfs 1.11 ft/s 0.21 ft 0.072 4 Ibs/ft2 0.34 Ibs/ft2 11.79 STABLE Substrate Unreinforced Straight 0.54 cfs 1.11 ft/s 0.21 ft 0.072 4 Ibs/ft2 0.47 Ibs/ft2 8.55 STABLE Vegetation https://ecmds.com/project/159876/channel-analysis/260936/show 1/1 2/28/24, 12:52 PM ECMDS 7.0 NORTH North American Green AMERICAN 5401 St. Wendel-Cynthiana Rd. Poseyville, Indiana 47633 GREEN Tel. 800.772.2040 >Fax 812.867.0247 www.nagreen.com ECMDS v7.0 CHANNEL ANALYSIS >>>swale H Name swale H Discharge 0.72 Channel Slope 0.037 Channel Bottom Width 1.5 Left Side Slope 4 Right Side Slope 4 Low Flow Liner Retardence Class C 6-12 in Vegetation Type Mix(Sod and Bunch) Vegetation Density Very Good 80-95% Soil Type Clay Loam(CL) Unreinforced Vegetation Normal Permissible Calculated Safety Staple Phase Reach Discharge Velocity Mannings N Remarks Depth Shear Stress Shear Stress Factor Pattern Underlying Straight 0.72 cfs 1.26 ft/s 0.23 ft 0.069 4 Ibs/ft2 0.38 lbs/ft2 10.41 STABLE Substrate Unreinforced Straight 0.72 cfs 1.26 ft/s 0.23 ft 0.069 4 Ibs/ft2 0.54 Ibs/ft2 7.39 STABLE Vegetation https://ecmds.com/project/159876/channel-analysis/260938/show 1/1 2/28/24, 12:54 PM ECMDS 7.0 NORTH North American Green AMERICAN 5401 St. Wendel-Cynthiana Rd. Poseyville, Indiana 47633 GREEN Tel. 800.772.2040 >Fax 812.867.0247 www.nagreen.com ECMDS v7.0 CHANNEL ANALYSIS >>>swale I Name swale I Discharge 0.71 Channel Slope 0.02 Channel Bottom Width 2 Left Side Slope 3 Right Side Slope 3 Low Flow Liner Retardence Class C 6-12 in Vegetation Type Sod Former Vegetation Density Very Good 80-95% Soil Type Clay Loam(CL) Unreinforced Vegetation Normal Permissible Calculated Safety Staple Phase Reach Discharge Velocity Mannings N Remarks Depth Shear Stress Shear Stress Factor Pattern Underlying Straight 0.71 cfs 0.92 ft/s 0.27 ft 0.08 4 Ibs/ft2 0.26 lbs/ft2 15.45 STABLE -- Substrate Unreinforced Straight 0.71 cfs 0.92 ft/s 0.27 ft 0.08 4 Ibs/ft2 0.34 Ibs/ft2 11.68 STABLE -- Vegetation https://ecmds.com/project/159876/channel-analysis/260939/show 1/1 2/28/24, 12:55 PM ECMDS 7.0 NORTH North American Green AMERICAN 5401 St. Wendel-Cynthiana Rd. Poseyville, Indiana 47633 GREEN Tel. 800.772.2040 >Fax 812.867.0247 www.nagreen.com ECMDS v7.0 CHANNEL ANALYSIS >>>swalej Name swale j Discharge 0.73 Channel Slope 0.024 Channel Bottom Width 1.5 Left Side Slope 3 Right Side Slope 3 Low Flow Liner Retardence Class C 6-12 in Vegetation Type Sod Former Vegetation Density Very Good 80-95% Soil Type Clay Loam(CL) Unreinforced Vegetation Normal Permissible Calculated Safety Staple Phase Reach Discharge Velocity Mannings N Remarks Depth Shear Stress Shear Stress Factor Pattern Underlying Straight 0.73 cfs 1.07 ft/s 0.29 ft 0.075 4 Ibs/ft2 0.31 Ibs/ft2 13 STABLE Substrate Unreinforced Straight 0.73 cfs 1.07 ft/s 0.29 ft 0.075 4 Ibs/ft2 0.43 Ibs/ft2 9.25 STABLE Vegetation https://ecmds.com/project/159876/channel-analysis/260940/show 1/1 5/13/24,4:17 PM ECMDS 7.0 NORTH North American Green AMERICAN 5401 St. Wendel-Cynthiana Rd. Poseyville, Indiana 47633 GREEN Tel. 800.772.2040 >Fax 812.867.0247 www.nagreen.com ECMDS v7.0 CHANNEL ANALYSIS >>>swale k Name swale k Discharge 21.69 Channel Slope 0.034 Channel Bottom Width 1 Left Side Slope 3 Right Side Slope 3 Low Flow Liner Retardence Class C 6-12 in Vegetation Type Mix(Sod and Bunch) Vegetation Density Very Good 80-95% Soil Type Silt Loam(SM) Unreinforced Vegetation Normal Permissible Calculated Safety Staple Phase Reach Discharge Velocity Mannings N Remarks Depth Shear Stress Shear Stress Factor Pattern Unreinforced Straight 21.69 cfs 4.55 ft/s 1.1 ft 0.043 4 Ibs/ft2 2.34 Ibs/ft2 1.71 STABLE Vegetation Underlying Straight 21.69 cfs 4.55 ft/s 1.1 ft 0.043 2.37 lbs/ft2 1.27 lbs/ft2 1.87 STABLE Substrate https://ecmds.com/project/159876/channel-analysis/265600/show 1/1 EXHIBIT F - DEED ilK 1148 957 REGiSTFIiFrI r�tArt►-h o 3: li PEGesl_rt of nctu; JACK5O'c cG.N c. Excise Tax:$0.00 Complelallmprovod Parcel ID M7572-11-90119 This instrument prepared by: J.Edwin Hanlon Mail after recording tn: Henson&Paul,P.A. P.O.Box 346,Cashiers,NC 21717 WARRANTY DEED THIS WARRANTY DEED is made this 28's day of Matth, 2002, by and betvxeu CASHIERS COMMUNITY COUNCIL, INC., a North Carolina non-profit corporation (hereinafter referred to as the "GRANrok'), and CASHIERS VALLEY COMMUNITY COUNCIL,INC.,*North Carolina non.ptn fit corporation,of P.O.Box 42,Cashiers,NC 2g717, ;hiereinstter referred to as the"GRANr'F.F"J The designation"GRANTOR"and"C,R ANTI:1"as used herein shall include said parties,their heirs,successors,and assigns,and shall include singular, plural,masculine,feminine or neuter as required by context. WITNESSf'TH: ' THAT said GRANTOR,for goad and valuable consideration paid by the GRANITE,the receipt of which is hereby a knnwledged,has and by these presents fins hereby give,grant,bargain, sell and convey unto said GRAN'!L•Ii in fee simple,all of that certain lot,pnroel or tracl of Land situate, lying and being in Cashiers Township, Jackson County, North Carolina, and more particularly described as follows: Being all of tho lands and premises described in the Deed dated December 7,197g, fort Cashiers Valley Community Center,Inc.to the Gratttor herein,recorded in Rook 492,Page 493,Jackson County Registry. Together with the tighbof--way described in Inc Right of Way Deed front Maggie Zachary to Cashiers Valley Community Center, Inc..,dated May 23, 1963,and reoorded in Book 270,Page 3d5,Jackson County Registry. Suhject to the Right of Way Agreement to the State Highway Commis tun.dated Fchruary t 1,1970,and recorded in Bonk 348,Page 129,Jackson County Registry. Subject to the Easement to Naunah;da Power and Light Company,recorded in Rook 713,Page 350,Jackson County Registry. • TO HAVE AND TO HOLD the above-described lands and premises and all privileges and appurtenances thereto Wringing,or in tinywise appertaining,unto the GRANTEE in fee simple AND the said GRANTOR covenants Co and with the GRANTEE,that GRANTOR is seized of the premises in fee simple,has the right re convey the same in fee simple,and that title is marketable and free and clear of all encumbrances,except as set forth above,and that GRANTOR will warrant and defatei the title again'the lawful claims of all persons whomsoever,except fur the exceptions herein Mattel. r•� nrr�uLtl ,t 'P'I 2le21 1tEMON&PAUL Pit 9• �' TucalamtTeOnwr.m a„va^I IOi&rt=ara,.m43 �OVf.. IBC 1148 3i8 1N WITNESS WHEREOF.the GRANTOR has caused this instrument to be exerulnd by it c duly authorized office. • CASHIERS COMMUNITY COL'NCLL,1J\C. • ' - rlettident STATE.OF 140e4Jl{tieaf;na..- COUNTY OF=.t srn `� I, lt_y;,C1 ,a Nnczy Public,certify that 44.s Mktn.?t- _,personally appeared before me this day and acknnwicdged that hcishr is President of CASHIERS COMMUNITY COUNCIL.INC.,a North Casolina non-protit eertporation.and that hei ahe.its President,being aothorircd to dr.so,executed the fotegoiog nn hehtlf of the Cnrroration. WETNESS my hand and nu lariat seal this / day of rr1 , 'orrzy SEAL' �► i•"45"1 �fq NxA csoFo OUsckonn `If Vt.711eJ' Not Public .• My CommissionEspub: STATE.OF NORTH CAROLTh A COON'?Or'JACICSON • The Ccttificatefs)of Grace E en is/are ced fted to he:moo.. I s ipd cument w +t presented for registration rod rei onled at 3 � °clock P M. on the IST clay of �1 1 ,2f02_,Ic.Deed look 1131 at Page. -— Reg'_ a reds • • • • 1 iLNSCN a,PAUL,P.:t. TOG gesnn.'Tsgwcnfl ec*30.C4 lull n..3rn,m.ua.:ea ..