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YADKI-024 Final Report
DAM HYDRAULIC CAPACITY ASSESSMENT REPORT (DRAFT) DEEP CREEK WS #6B (PL-566) YADKI-024 YADKIN COUNTY, NC PREPARED BY: HDR Engineering Inc. of the Carolinas under contract with WOOD E&I Solutions 2020 EXECUTIVE SUMMARY A hydraulic capacity analysis was completed for the Deep Creek WS #6b (Pl-566) in Yadkin County, North Carolina. The purpose of the study was to analyze the existing potential of the dam for overtopping during predetermined specified rainfall events using the North Carolina Dam Safety defined process and templates. The analyses were completed using the United States Army Corps of Engineers developed software Hydrologic Engineering Center – Hydrologic Modeling System (HEC-HMS) in combination with Arc-GIS to develop required input parameters. The rainfall events included in the analyses consist of 24-hour durations with return periods of 25 years, 50 years, 100 years, 200 years, 500 years and 1000 years. Results of the analyses indicate that this structure is hydraulically adequate for 25 years, 50 years, 100 years, and 200 years rainfall events. Data, input parameters, and final results can be found on the attached summary sheets and in the appendices of this report as well as in the associated electronic file in which all program files are stored. Drainage Area (Sq. Mi.)= Curve Number = Lag Time (min.)= Rainfall Distribution Methods = 847.0 666.4 694.8 723.9 753.6 784.0 815.2 986.8 987.3 987.8 988.3 988.8 ELEVATION 984.3 984.8 985.3 985.8 986.3 32.8 39.5 46.8 STORAGE (ACRE-FT) 0.0 3.4 7.1 11.3 16.0 21.1 26.7 968.3 965.3 965.8 966.3 966.8 967.3 967.8 975.8 978.3 ELEVATION 963.8 964.3 964.8 STORAGE (ACRE-FT) 585.1 611.5 638.6 74.24 96 SCS Type 2 SPILLWAY Primary Auxiliary TYPE Riser / Barrel Grass Lined Trapezoidal Channel ELEVATION 24 HOUR - 200 YEAR EVENT, 8.84 INCHES, ELEVATION 980.1 (0.2 FT FREE-BOARD) 24 HOUR - 100 YEAR EVENT, 7.93 INCHES, ELEVATION 979.7 (0.6 FT FREE-BOARD) 24 HOUR - 50 YEAR EVENT, 7.07 INCHES, ELEVATION 979.3 (1 FT FREE-BOARD) 24 HOUR - 25 YEAR EVENT, 6.23 INCHES, ELEVATION 978.9 (1.4 FT FREE-BOARD) SUMMARY OF INPUT PARAMETERS 3.05 SUMMARY SHEET OF HYDRAULIC CAPACITY RESULTS DEEP CREEK WS #6B (PL-566), YADKI-024 ANALYSIS PERFORMED BY: S. MURPHY, HDR 24 HOUR - 1000 YEAR EVENT, 11.1 INCHES, ELEVATION 980.8 (0.5 FT OVER-TOPPED) 24 HOUR - 500 YEAR EVENT, 10.1 INCHES, ELEVATION 980.5 (0.2 FT OVER-TOPPED) TOP OF DAM ELEVATION = 980.3 YADKI-024DEEP CREEK WS #6B (PL-566)OCTOBER 28, 2020 2212.9 NOT TO SCALE 1864.8 1919.8 1976.0 2033.4 2092.0 2151.8 1559.2 1607.4 1656.6 1706.9 1758.4 1811.0 1290.6 1333.1 1376.4 1420.8 1466.0 1512.1 1054.0 1091.3 1129.5 1168.5 1208.3 1249.0 879.5 912.8 946.9 981.7 1017.4 1001.8 1002.3 1002.8 1003.3 1003.8 998.8 999.3 999.8 1000.3 1000.8 1001.3 995.8 996.3 996.8 997.3 997.8 998.3 992.8 993.3 993.8 994.3 994.8 995.3 989.8 990.3 990.8 991.3 991.8 992.3 989.3 485.5 509.5 534.1 559.3 353.4 374.1 395.3 417.0 439.2 462.1 240.7 258.1 276.0 294.5 313.6 333.2 149.0 162.6 177.0 192.1 207.7 224.0 81.1 91.1 101.6 112.5 124.0 136.1 54.5 62.8 71.7 983.3 983.8 980.3 980.8 981.3 981.8 982.3 982.8 977.3 977.8 978.3 978.8 979.3 979.8 974.3 974.8 975.3 975.8 976.3 976.8 971.3 971.8 972.3 972.8 973.3 973.8 968.8 969.3 969.8 970.3 970.8 YADKI-024DEEP CREEK WS #6B (PL-566)OCTOBER 28, 2020 APPENDIX A Watershed Boundary Sources: Esri, HERE, Garmin, USGS, Intermap, INCREMENT P,NRCan, Esri Japan, METI, Esri China (Hong Kong), Esri Korea,Esri (Thailand), NGCC, (c) OpenStreetMap contributors, and theGIS User Community Deep Creek WS #6b (PI-566) - YADKI-024 - Watershed Boundary Legend Longest FlowPath Watershed Bound ary 0 0.65 1.30.325 Miles Date: 10 /5/2020 /Drainage Area: 3.05 Square MilesFlowpath Length: 4.3 miles APPENDIX B Lag Time Calculation Dam No:YADKI-024 Date:10/23/2020 Dam Name:Deep Creek WS #6b (Pl-566)Engineer:K. Trefzger Maximum Potential Retention (inches):S =(1000/cn')-10 Time of Concentration (hours):Tc =l0.8*(S+1)0.7 1140*Y0.5 Basin Data:Input Values in yellow Curve Number CN =74.244 from NRCS CN Calculation S =3.46911 in. Mean Basin Slope Y =8.10353 %from Watershed Mean slope Longest Flowpath:4.28 mi.from Watershed Longest flowpath Flow Length l =22598.4 ft. Time of Concentration Tc =2.67 Hours Tc =160 mins Lag Time TL =1.60 Hours TL =96 mins APPENDIX C NRCS Curve Number Summary Sheet Change CN according to TR-55 (see tables below) NLCD (2016) Landuse TR-55 Landuse HSG A (sq. ft.)CN HSG B (sq. ft.)CN HSG C (sq. ft.)CN HSG D (sq. ft.)CN Open Water Not Available 0 100 0 75175 100 7517453 11182 100 1118191 136455 100 13645458 Developed, Open Space Open space - Fair condition (grass cover 50% to 75%)0 49 0 1353265 69 93375267 3779260 79 298561547 150095 84 12607945 Developed, Low Intensity Residential districts by average lot size: 1/3 acre 0 57 0 246858 72 17773771 1038221 81 84095921 25243 86 2170886 Developed, Medium Intensity Residential districts by average lot size: 1/8 acre 0 77 0 94748 85 8053546 350880 90 31579217 0 92 0 Developed, High Intensity Urban districts - Commercial and business 0 89 0 6532 92 600975 119406 94 11224181 0 95 0 Barren Land Newly graded areas 0 77 0 0 86 0 0 91 0 0 94 0 Deciduous Forest Woods - Fair 0 36 0 12916311 60 774978631 11147775 73 813787601 1692289 79 133690842 Evergreen Forest Woods - Fair 0 36 0 91533 60 5491985 522070 73 38111078 6395 79 505232 Mixed Forest Woods - Fair 0 36 0 2832293 60 169937582 3467732 73 253144423 598513 79 47282562 Shrub/Scrub Brush - Fair 0 35 0 540911 56 30291017 112926 70 7904840 12337 77 949967 Herbaceuous Herbaceuous - Fair 0 60 0 236698 71 16805547 647219 81 52424717 0 89 0 Hay/Pasture Pasture - Fair 0 49 0 9122591 69 629458759 19932197 79 1574643583 1060486 84 89080823 Cultivated Crops Row crops (SR + CR) - Poor 0 71 0 2216356 80 177308499 10288064 87 895061530 322560 90 29030390 Woody Wetlands Not Available 0 80 0 0 85 0 0 90 0 0 95 0 Emergent Herbaceuous Wetlands Not Available 0 80 0 0 85 0 0 90 0 0 95 0 Weighted CN=74.24 NOTE: Curve Numbers are from SCS TR-55 with the exception of assumed HSG A (CN=60) for Herbaceous,Open Water, Woody Wetlands, and Emergent Herbaceous Wetlands. NOTE: double-check all the land types are being calculated and texts are accurate NOTE: double-check the exported attribute table has the same table format as the "Export_Output" table APPENDIX D Hyetograph Results Used for Analysis 0.0 2.0 4.0 6.0 8.0 10.0 12.0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24Cumulative Depth (in)Time (hrs) Hyetographs for 24-Hour SCS Type II Rainfall Distributions 25YR 50YR 100YR 200YR 500YR 1000YR APPENDIX E NOAA Atlas 14 Rainfall Table Point precipitation frequency estimates (inches) NOAA Atlas 14 Volume 2 Version 3 Data type: Precipitation depth Time series type: Partial duration Project area: Ohio River Basin Location name (ESRI Maps): Boonville, North Carolina USA Station Name: - Latitude: 36.171736° Longitude: -80.769122° Elevation (USGS): 1063.39 ft PRECIPITATION FREQUENCY ESTIMATES by duration for ARI (years):1 2 5 10 25 50 100 200 500 1000 5-min:0.354 0.42 0.496 0.552 0.62 0.669 0.716 0.76 0.814 0.854 10-min:0.566 0.672 0.795 0.883 0.989 1.07 1.14 1.2 1.29 1.35 15-min:0.707 0.844 1.01 1.12 1.25 1.35 1.44 1.52 1.62 1.69 30-min:0.97 1.17 1.43 1.62 1.86 2.03 2.2 2.37 2.58 2.73 60-min:1.21 1.46 1.83 2.11 2.47 2.75 3.03 3.32 3.7 3.99 2-hr:1.43 1.74 2.19 2.54 3.02 3.4 3.79 4.19 4.74 5.18 3-hr:1.55 1.88 2.38 2.76 3.29 3.72 4.16 4.61 5.25 5.77 6-hr:1.93 2.34 2.95 3.43 4.08 4.62 5.16 5.74 6.54 7.17 12-hr:2.39 2.89 3.63 4.22 5.02 5.67 6.34 7.04 8.01 8.79 24-hr:2.88 3.5 4.44 5.19 6.23 7.07 7.93 8.84 10.1 11.1 2-day:3.44 4.15 5.23 6.06 7.2 8.1 9.02 9.98 11.3 12.3 3-day:3.66 4.41 5.52 6.38 7.55 8.48 9.44 10.4 11.8 12.8 4-day:3.88 4.67 5.82 6.7 7.91 8.87 9.85 10.9 12.2 13.3 7-day:4.44 5.32 6.49 7.4 8.62 9.57 10.5 11.5 12.8 13.8 10-day:5.09 6.07 7.31 8.26 9.51 10.5 11.4 12.4 13.7 14.7 20-day:6.82 8.08 9.56 10.7 12.2 13.4 14.6 15.7 17.3 18.5 30-day:8.48 9.98 11.5 12.7 14.1 15.2 16.2 17.2 18.5 19.5 45-day:10.7 12.5 14.2 15.5 17 18.2 19.2 20.3 21.6 22.6 60-day:12.8 14.9 16.7 18.1 19.8 21.1 22.3 23.5 25 26.1 Date/time (GMT): Fri Oct 23 17:26:03 2020 pyRunTime: 0.0208308696747 APPENDIX F Outlet Works Rating Curves Total outlet discharge from the spillway system Client:NCEM Date:10/21/2020 Project:Overtopping Study Engineer:T.Carter Dam:Deep Creek WS #6b (PI-566)Dam No.YADKI-024 Reservior Water Level (RWS) Elevation (ft) Total discharge from the spillway system (cfs) (from Hydrocad) 963.8 0.0 964.6 4.3 965.4 12.0 966.2 17.2 967.0 21.1 967.8 24.4 968.6 27.2 969.4 29.8 970.2 32.2 971.0 34.4 971.8 36.5 972.6 38.4 973.4 40.3 974.2 42.1 975.0 43.8 975.8 45.4 976.6 81.5 977.4 111.1 978.2 112.8 979.0 616.4 979.8 1699.5 980.6 3141.4 981.4 4877.6 982.2 6873.4 983.0 9106.3 983.8 11230.6 984.6 12833.9 985.4 14218.8 986.2 15464.6 987.0 16609.1 987.8 17674.9 988.6 18677.0 989.4 19626.0 990.2 20529.7 991.0 21394.2 991.8 22224.4 992.6 23024.0 993.4 23796.2 994.2 24543.8 995.0 25268.9 995.8 25973.6 996.6 26659.4 997.4 27327.9 998.2 27980.2 999.0 28617.5 999.8 29240.8 1000.6 29851.0 0.0 5000.0 10000.0 15000.0 20000.0 25000.0 30000.0 35000.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0 1005.0Total discharge from the spillway system (cfs)Reservior Water Level (RWS) Elevation (ft) The whole spillway system rating curve (cfs) YADKI-024 Deep Creek WS #6b (PI-566) Rainfall not specifiedYADKI-024 Printed 10/28/2020Prepared by HDR, Inc Page 1HydroCAD® 10.00-25 s/n 07102 © 2019 HydroCAD Software Solutions LLC Summary for Pond 1P: YADKI-024 Deep Creek WS #6b (PI-566) Volume Invert Avail.Storage Storage Description #1 963.80' 96,391,949 cf Custom Stage Data (Prismatic) Listed below (Recalc) YADKI-024 Deep Creek WS #6b (PI-566) Rainfall not specifiedYADKI-024 Printed 10/28/2020Prepared by HDR, Inc Page 2HydroCAD® 10.00-25 s/n 07102 © 2019 HydroCAD Software Solutions LLC Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 963.80 277,354 0 0 964.30 308,613 146,492 146,492 964.80 345,762 163,594 310,086 965.30 384,980 182,686 492,771 965.80 423,896 202,219 694,990 966.30 467,598 222,874 917,864 966.80 511,768 244,842 1,162,705 967.30 559,111 267,720 1,430,425 967.80 609,307 292,105 1,722,529 968.30 653,320 315,657 2,038,186 968.80 698,145 337,866 2,376,052 969.30 744,844 360,747 2,736,800 969.80 796,826 385,418 3,122,217 970.30 846,211 410,759 3,532,976 970.80 890,693 434,226 3,967,202 971.30 933,594 456,072 4,423,274 971.80 975,342 477,234 4,900,508 972.30 1,027,637 500,745 5,401,253 972.80 1,089,131 529,192 5,930,445 973.30 1,152,119 560,313 6,490,757 973.80 1,219,658 592,944 7,083,702 974.30 1,285,049 626,177 7,709,878 974.80 1,339,346 656,099 8,365,977 975.30 1,388,945 682,073 9,048,050 975.80 1,438,027 706,743 9,754,793 976.30 1,486,895 731,231 10,486,023 976.80 1,537,188 756,021 11,242,044 977.30 1,587,607 781,199 12,023,243 977.80 1,635,293 805,725 12,828,968 978.30 1,685,332 830,156 13,659,124 978.80 1,735,313 855,161 14,514,285 979.30 1,781,221 879,134 15,393,419 979.80 1,824,453 901,419 16,294,837 980.30 1,866,641 922,774 17,217,611 980.80 1,912,148 944,697 18,162,308 981.30 1,965,742 969,473 19,131,781 981.80 2,016,982 995,681 20,127,462 982.30 2,066,035 1,020,754 21,148,216 982.80 2,115,732 1,045,442 22,193,658 983.30 2,166,582 1,070,579 23,264,236 983.80 2,219,600 1,096,546 24,360,782 984.30 2,276,074 1,123,919 25,484,700 984.80 2,331,465 1,151,885 26,636,585 985.30 2,389,717 1,180,296 27,816,880 985.80 2,447,080 1,209,199 29,026,080 986.30 2,503,516 1,237,649 30,263,729 986.80 2,561,592 1,266,277 31,530,006 987.30 2,620,459 1,295,513 32,825,518 987.80 2,681,660 1,325,530 34,151,048 YADKI-024 Deep Creek WS #6b (PI-566) Rainfall not specifiedYADKI-024 Printed 10/28/2020Prepared by HDR, Inc Page 3HydroCAD® 10.00-25 s/n 07102 © 2019 HydroCAD Software Solutions LLC 988.30 2,741,182 1,355,711 35,506,759 988.80 2,802,598 1,385,945 36,892,704 989.30 2,865,996 1,417,149 38,309,852 989.80 2,932,500 1,449,624 39,759,476 990.30 3,003,457 1,483,989 41,243,465 990.80 3,074,863 1,519,580 42,763,045 991.30 3,145,205 1,555,017 44,318,062 991.80 3,218,701 1,590,977 45,909,039 992.30 3,289,678 1,627,095 47,536,134 992.80 3,359,727 1,662,351 49,198,485 993.30 3,431,250 1,697,744 50,896,229 993.80 3,507,207 1,734,614 52,630,843 994.30 3,583,789 1,772,749 54,403,592 994.80 3,661,826 1,811,404 56,214,996 995.30 3,740,088 1,850,479 58,065,475 995.80 3,820,146 1,890,059 59,955,533 996.30 3,901,016 1,930,291 61,885,824 996.80 3,978,965 1,969,995 63,855,819 997.30 4,060,908 2,009,968 65,865,787 997.80 4,148,770 2,052,420 67,918,207 998.30 4,240,596 2,097,342 70,015,548 998.80 4,336,172 2,144,192 72,159,740 999.30 4,431,738 2,191,978 74,351,718 999.80 4,530,771 2,240,627 76,592,345 1,000.30 4,634,580 2,291,338 78,883,683 1,000.80 4,740,498 2,343,770 81,227,452 1,001.30 4,846,318 2,396,704 83,624,156 1,001.80 4,947,070 2,448,347 86,072,503 1,002.30 5,050,762 2,499,458 88,571,961 1,002.80 5,156,133 2,551,724 91,123,685 1,003.30 5,267,588 2,605,930 93,729,615 1,003.80 5,381,748 2,662,334 96,391,949 Device Routing Invert Outlet Devices #1 Primary 950.70'30.0" Round 30" RCP L= 175.0' RCP, sq.cut end projecting, Ke= 0.500 Inlet / Outlet Invert= 950.70' / 948.95' S= 0.0100 '/' Cc= 0.900 n= 0.013, Flow Area= 4.91 sf #2 Device 1 963.80'22.5" W x 18.0" H Vert. Riser Orifice C= 0.600 #3 Device 1 975.80'90.0" W x 15.0" H Vert. Riser Weirs X 2.00 C= 0.600 #4 Secondary 978.30'Emergency Spillway, Cv= 3.10 (C= 3.88) Head (feet) 0.00 1.00 2.00 3.00 4.00 5.00 Width (feet) 220.00 224.00 228.00 232.00 236.00 240.00 Primary OutFlow Max=0.00 cfs @ 5.00 hrs HW=0.00' TW=952.60' (Fixed TW Elev= 952.60') 1=30" RCP ( Controls 0.00 cfs) 2=Riser Orifice ( Controls 0.00 cfs) 3=Riser Weirs ( Controls 0.00 cfs) Secondary OutFlow Max=0.00 cfs @ 5.00 hrs HW=0.00' (Free Discharge) 4=Emergency Spillway ( Controls 0.00 cfs) YADKI-024 Deep Creek WS #6b (PI-566) Rainfall not specifiedYADKI-024 Printed 10/28/2020Prepared by HDR, Inc Page 4HydroCAD® 10.00-25 s/n 07102 © 2019 HydroCAD Software Solutions LLC Stage-Discharge for Pond 1P: YADKI-024 Deep Creek WS #6b (PI-566) Elevation (feet) Discharge (cfs) Primary (cfs) Secondary (cfs) 963.80 0.00 0.00 0.00 964.20 1.52 1.52 0.00 964.60 4.31 4.31 0.00 965.00 7.91 7.91 0.00 965.40 11.99 11.99 0.00 965.80 14.90 14.90 0.00 966.20 17.24 17.24 0.00 966.60 19.28 19.28 0.00 967.00 21.11 21.11 0.00 967.40 22.79 22.79 0.00 967.80 24.36 24.36 0.00 968.20 25.83 25.83 0.00 968.60 27.21 27.21 0.00 969.00 28.53 28.53 0.00 969.40 29.79 29.79 0.00 969.80 31.00 31.00 0.00 970.20 32.17 32.17 0.00 970.60 33.29 33.29 0.00 971.00 34.37 34.37 0.00 971.40 35.43 35.43 0.00 971.80 36.45 36.45 0.00 972.20 37.44 37.44 0.00 972.60 38.41 38.41 0.00 973.00 39.35 39.35 0.00 973.40 40.27 40.27 0.00 973.80 41.18 41.18 0.00 974.20 42.06 42.06 0.00 974.60 42.92 42.92 0.00 975.00 43.77 43.77 0.00 975.40 44.60 44.60 0.00 975.80 45.41 45.41 0.00 976.20 58.40 58.40 0.00 976.60 81.45 81.45 0.00 977.00 110.16 110.16 0.00 977.40 111.06 111.06 0.00 977.80 111.96 111.96 0.00 978.20 112.84 112.84 0.00 978.60 254.10 113.72 140.39 979.00 616.41 114.59 501.82 979.40 1,106.84 115.45 991.39 979.80 1,699.54 116.31 1,583.23 980.20 2,380.69 117.17 2,263.52 980.60 3,141.38 118.01 3,023.37 981.00 3,975.28 118.85 3,856.43 981.40 4,877.63 119.69 4,757.95 981.80 5,844.69 120.51 5,724.17 982.20 6,873.42 121.34 6,752.09 982.60 7,961.33 122.15 7,839.18 983.00 9,106.31 122.96 8,983.34 983.40 10,277.13 123.77 10,153.35 983.80 11,230.61 124.57 11,106.04 Elevation (feet) Discharge (cfs) Primary (cfs) Secondary (cfs) 984.20 12,068.01 125.37 11,942.64 984.60 12,833.87 126.16 12,707.71 985.00 13,547.12 126.95 13,420.17 985.40 14,218.78 127.73 14,091.06 985.80 14,856.18 128.50 14,727.68 986.20 15,464.55 129.27 15,335.28 986.60 16,047.83 130.04 15,917.79 987.00 16,609.08 130.80 16,478.28 987.40 17,150.78 131.56 17,019.22 987.80 17,674.93 132.32 17,542.62 988.20 18,183.21 133.07 18,050.15 988.60 18,677.04 133.81 18,543.23 989.00 19,157.63 134.55 19,023.07 989.40 19,626.01 135.29 19,490.72 989.80 20,083.11 136.02 19,947.09 990.20 20,529.73 136.75 20,392.97 990.60 20,966.56 137.48 20,829.08 991.00 21,394.24 138.20 21,256.04 991.40 21,813.34 138.92 21,674.42 991.80 22,224.36 139.63 22,084.72 992.20 22,627.76 140.34 22,487.41 992.60 23,023.95 141.05 22,882.90 993.00 23,413.32 141.75 23,271.56 993.40 23,796.20 142.45 23,653.75 993.80 24,172.93 143.15 24,029.78 994.20 24,543.78 143.84 24,399.94 994.60 24,909.04 144.53 24,764.51 995.00 25,268.94 145.22 25,123.72 995.40 25,623.73 145.90 25,477.82 995.80 25,973.60 146.58 25,827.02 996.20 26,318.78 147.26 26,171.52 996.60 26,659.43 147.94 26,511.49 997.00 26,995.74 148.61 26,847.13 997.40 27,327.87 149.27 27,178.59 997.80 27,655.97 149.94 27,506.03 998.20 27,980.19 150.60 27,829.59 998.60 28,300.66 151.26 28,149.40 999.00 28,617.51 151.92 28,465.59 999.40 28,930.86 152.57 28,778.29 999.80 29,240.83 153.22 29,087.61 1,000.20 29,547.52 153.87 29,393.65 1,000.60 29,851.04 154.51 29,696.53 1,001.00 30,151.48 155.16 29,996.33 1,001.40 30,448.94 155.80 30,293.14 1,001.80 30,743.50 156.43 30,587.06 1,002.20 31,035.24 157.07 30,878.18 1,002.60 31,324.25 157.70 31,166.56 1,003.00 31,610.61 158.33 31,452.28 1,003.40 31,894.38 158.96 31,735.42 1,003.80 32,175.63 159.58 32,016.05