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HomeMy WebLinkAboutSW6201004_Calcs (Riprap)_20210315DID Project No. Hoke County, North Carolina 110 Commerce Avenue Calculated By Southern Pines, NC 28387 JILH (910) 684-8126 Checked By JLH DESIGN: Step 1. Minimum Tailwater Condition Step2L D-a= 30in. Pipe diameter in inches D-o= 2.50ft. Pipe diameter infeet Q40= 33.28ds Pipe outlet (from drainage calculations) d'50 = 0.5ft� from Figuro0.OG a L-a = 12ft. from Figure 8.O8a Step 3. 3°D-o = 7.50ft. 3times the outlet pipe diameter VV= 14.50ft. Pipe diameter +Apron length Stmp4. d-max 0.75ft. Maximum Stone Diamntor(1.5°d-5O) in inches d-max Sin. Maximum Stone Diameter (1.5°d-5O)infeet Step 5. Thiokneoo= 1.13ft. Min. Apron Thickness With Filter Fabric (1.5°d'max) in feet Thickness = 14 in. Min. Apron Thickness With Filter Fabric (1.5°d-mox) in inches |OE8kGNDI/NENSuJNS: Apron Di ensions Riprap Class Length Width 3-D-o hick RM|NOLOGY: O10= 104ee/Dooign Gtonn. Peak Discharge, (cfs) D*= Pipe Diameter, (in. &ftj d-50=Mean Stone Diameter ofRip-Rap.(ftj Lm= Length ofRip-Rap Apron, (ft) 3^D'o = Width ofRip-Rap Apron @ Pipe Outlet, (ft.) VV=Width ofRip-Rap Apron @ End ofApron, yRj d-max= Maximum Stone Diameter ofRip'Rap. (ft. & in.) Thickness = Thickness ofRip-Rap Apron With Filter Fabric, (ft. &inj Blackhawk Landing Jan, 2021 DD Project No. Hoke County, North Carolina 110 Commerce Avenue Calculated By Southern Pines, NC 28387 JLH (910) 684-8126 Checked By JLH STORM DESIGN: 10Yeor BACKGROUND: Use the E&GControl Planning & Design Manual, Section 8.08, �REFERENCE: (VCDBfNFl 1903) Step 1. Minimum Tailwater Condition Step2 Qo= 24in. D-o = 2.00fL 0'10= 12.53cfs; d-5O= 04ft. L-a= 9K. Step3. 3°D'o= 8.00ft. VV= 11.00ft, Step 4. d-max 0.60ft. d-max 7in. Step6 Thiokneoo= O.SUft. Thiokneee= 11 in. IDESIGN DIMENSIONS: Pipe diameter in inches Pipe diameter infeet Pipe outlet (from drainage calculations) from Figure 8.USa from Figure 8.00a 3times the outlet pipe diameter Pipe diameter + Apron length Maximum Stone Diameter (1.5°d-5O) in inches Maximum Stone Diameter (1.5*d-5O) in feet Min. Apron Thickness With Filter Fabric (1.5°d-mmx)infeet Min. Apron Thickness With Filter Fabric (1.5°d-max)ininches Apron Dimensions Riprap Length Width =3'D-o Thick Class TERMINOLOGY: Q10= 10-YeorDesign Storm, Peak Discharge, (cfs) D* = Pipe Diameter, (in. &ft.) d'5O=Mean Stone Diameter ofRip-Rap.(t) Lo = Length ofRip-Rap Apron, Vt.> 3°D-o = Width ofRip-Rap Apron @ Pipe Outlet, (ft) VV=Width ofRip-Rap Apron @ End ofApron, Utj d-max=Maximum Stone Diameter ofRip'Rap.(ft.&in.) � Thickness = Thickness ofRip-Rap Apron With Filter Fabric, (ft. &inj DD Project No. Hoke County, North Carolina 110 Commerce Avenue Calculated By Southern Pines, NC 28387 JLH (910) 684-8126 Checked By JLH STORM DESIGN: 10 Year Use the E&S Control Planning & Design Manual, Section 8.06. �REFERENCE: (NCDEHNR, 1003) Step 1. Minimum Tailwater Condition Step2. D-o= 30in. D-o= 2�50ft� Q-10= 3238ds d-50 = 0.5ft. La= 12ft. Step 3. 3°D'o = 7.50ft. VV = 14.50ft. Stap4. d-max 075ft. d-max Qin. Step5. Thicknuss= 113ft. Thickneum= 14in. DESIGN DIMENSIONS: Pipe diameter in inches Pipe diameter infeet Pipe outlet (from drainage calculations) from Figure 8.00a from Figure 8.06 a 3times the outlet pipe diameter Pipe diameter + Apron length Maximum Stone Diamoter(1.5*d-5O) in inches Maximum Stone Diameter (1.5°d-5O) in feet Min. Apron Thickness With Filter Fabric (1.5^d'mmx)infeet Min. Apron Thickness With Filter Fabric (1.5°d'mox)ininches Apron Di ensions Rip Length Width 3-D-o Thick RD0|NOLOGY: U10=10-Yea Design Storm, Peak Discharge, (cfs) D-o = Pipe Diameter, (in. &ftj d-50=Mean Stone Diameter ufRip-Rap.(t) Lm = Length ofRip-Rap Apron, (ft.) 3°D-o = Width ofRip-Rap Apron @ Pipe Outlet, Vtj VV=Width ofRip-Rap Apron @ End ofApron, (ft.) d-max= Maximum Stone Diameter ofRip-Rap. (k. & in.) Thicknosa= Thickness ofRip-Rap Apron With Filter Fabric, (ft. &inj Blackhawk Landing Feb, 2021 DD Project No. Hoke County, North Carolina 110 Commerce Avenue Calculated By Southern Pines, NC 28387 JLH (910) 684-8126 Checked By JLH STORM DESIGN: 10Year Use the E&S Control Planning & Design Manual, Section 8.06. �REFERENCE: (NCDEHNR /003) Step 1. Minimum Tailwater Condition Step2. D-o= 20in. D-o= 2.50ft. Q'10= 65.04ds d-50 = 08ft. La= 22ft. Step3. 3°D-o= 7.50ft. VV= 24.50ft. Stap4. d-max 1.20ft. d-max 14in. Gtep5. Thickness = 1.80ft. Thickness = 22in. DESIGN DIMENSIONS: Pipe diameter in inches Pipe diameter infeet Pipe outlet (from drainage calculations) from Figure 8.06 e from Figure D.OGa 8times the outlet pipe diameter Pipe diameter + Apron length Maximum Stone Diameter (1.5*d-5U) in inches Maximum Stone Diameter (1.5°d-50)infeet Min. Apron Thickness With Filter Fabric (1.5°d-max)infeet Min. Apron Thickness With Filter Fabric (1.5^d-ma4ininches Apron Dimensions Riprap Class Length Width 3-D-o Thick TERMINOLOGY: D10= 1O-YoarDesign Storm, Peak Discharge, (cfs) D-o= Pipe Diameter. (in. &ftj d-5O=Mean Stone Diameter ofRip-Rep.(b.) La = Length ofRip-Rap Apron, Vt.> 3°D'o = Width nfRip-Rap Apron @ Pipe Outlet, Ak.> VV=Width ofRip-Rap Apron @ End ofApron, (ftj d-max = Maximum Stone Diameter ofRip-Rap.(ft.&inj � Thickness = Thickness ofRip-Rap Apron With Filter Fabric, (ft. &in.> a V r, rT1 11 M, R March 15, 2021 Stormwater Program NCDEQ Water Quality 1617 Mail Service Center Raleigh, NC 27699-1617 Attn: Jim Farkas From: Lee Humphrey RE: Blackhawk Landing Stormwater Permit Application SW6201004 Comment Response Corey, We received your email dated February 22, with comments concerning the proposed Blackhawk Landing Subdivision in Hoke County. In response, please see the following; I . The Total Surface Area has been revised. 2. The full build -out potential of 100% BUA is used to design the SCM. A Hoke County GIS is included showing the home and apartment lot designations. A table is also included showing the lot size for each designation. These are included in the calculations. 3. The full build -out potential of 100% BUA is used to design the SCM. A Hoke County GIS is included showing the home and apartment lot designations. A table is also included showing the lot size for each designation. These are included in the calculations. 4. The extents of the surface area are shown on sheet C-2, Site Plan and new sheet C- 19, Stormwater Site Plan. 5. The BUA is listed on sheet C-19, Stormwater Site Plan. The sidewalks are broken down by section and labeled and the remaining is listed in a chart on the left hand side of the page. 6. The SCM Drainage Area is shown on sheet C- 19, Sotrmwater Site Plan and sheet C- 15, Storm Drainage Area Plan. 150 S. Page Street Southern Pines, NC 28387 PH: (910) 684-8646 Firm No. P-1275 -61ouble D Engineering, PLLC 7. The vegetated buffer is shown on sheet C-19, Sotrmwater Site Plan and sheet C-2, Site Plan. Since the west side of the surface water is mainly wetlands and the uplands have no access, we plan and letting the entire west side of the surface water remain permanently natural. 8. Yes, please cross out the signature on Section IX. 9. a (i) Line has been included. a (ii) Lines have been included. b (i) Lines have been removed. b (ii) (1) Line has been revised. b (ii) (2) Line has been revised to Simple Method. c (i) Line has been revised. 10. A copy of the calculations is attached. 11. The SCM access and maintenance easements are shown on sheet C-19, Sotrmwater Site Plan and sheet C-2, Site Plan. Also, since the open space will be controlled by the HOA along with the Stormwater Treatment, they can access around the back of Lot 60 as well. 12. The drainage ditch has been revised to show flowing into the forebay. If you have any questions or need any additional information regarding this project, please contact this office. Thank you. 150 S. Page Street Southern Pines, NC 28387 PH: (910) 684-8646 Firm No. P- 1275 DOUBLE D ENGINEERING, PLLC 150 S. Page Street li„03115/21 DATE DESIGN PHASE PRELIM L>Li PROJECT NO Southern Pines, NC 28387 PROJECT NAME CONSTR (910) 684-8646 Blackhawk Landing DD2005 REVISION LOCATION BY P-1 275 RECORD Hoke County, NC JLH orHER CHECKED BY (SPECIFYI DTLI o oi3 STORMDRAINAGE SCHEDULE CONTINUED, 195 -12 INLET INLET CI, INLET TOTAL INLET PIPE Tc TIME C, RUNOFF FROM TO AREAS AREA RUNOFF DISCHARGE' AREAS TIME TIME OF CONC.� INTENSITY COEFF (INLETS I IAC) COEFF. CFS AC) (MINI (MIN) (Mlw (INIH-) Cl 1 Cl 2 cl 1 26229 040 8.36 2623 Soo 000 5.00 7.97 040 C12 Cl 4 Cl 2 07242 040 2 31 3347 500 006 506 7.97 040 Cl 4 Cl 5 Cl 4 0.6889 040 220 4 Dae, 500 087 573 7 97, 036 CI 5 Cl 7 Cl 5 00427 060 020 4.079 5 00 073 646 7 97, 049 Cl 7 cl 8 Cl 7 0 1719 060 082 4 251 5.00 097 743 7 97 042 cl 8 CI 9 Cl 8 0.3094 040 099 4.560 Soo 1.07 850 7 97, 028 cl 9 cl 11 Cl 9 0 3485 040 1 11 4.909 500 1.23 9.74 7 97 022 Cl 11 Cl 12 cl 11 04851 040 1 55 5394 5 00 1 49 11.23 7 97, 0 19 Cl 12 J8 2 Cl 12 03289 040 1 05 6723 5 00 1.54 12 76 7 97 0 16 JB 2 JB 3 JB 2 00000 040 Goo 6 723 5 00 1 60 14 37 7 97, 0 15 JB 3 OUTLET JB 3 0 OOOD, 040 Goo 5723 500 1 87 16.24 7 97 0 13 Cl 13 Cl 14 CI 13 02095 0.50 083 0210 500 000 500 797 050 CI 14 cl 15 Cl 14 00548 0 80 0.35 5449 500 1.54 12.76 7 97 032 cl 15 Cl 16 Cl 15 00631 090 045 5512 500 1 57 14.33 797, 042 cl 16 Cl 17 Cl 16 00500 090 036 5562 500 161 1595 7 974 030 Cl 17 OUTLET Cl 17 00244. 040 006 5536, 500 161 15.95 797, 0 14 Cl 18 cl 19 cl 18 31780 040 10.13 3 178 500 000 Soo 797 040 Cl 19 Cl 17 cl 19 00450. 0.90 0.32 3.223 500 007 507 797. 089 C13 Cl 4 Cl 3 11339 040 361 1 134500 000 500 7.97 040 C16 Cl 7 CIS 00665, 090 048 0 067, 500 000 500 797 0.90 cl 10 CI 9 Cl 10 02190 040 0.70 0.219 5 SO 000 5.00 797 040 Cl 39 CI cl 39 2 8240 040 9 00 2824, 500 000 5 00 7 97, 040 Cl 12 cl 11 Cl 12 03289 040 105 0329 500 000 500 797 040 Cl 20 Cl 21 Cl 20 0 5420 0 40 1 73 0 542 500 000 500 7 97 040 Cl 21 Cl 23 Cl 21 2 4016 040 7 66 2.944 500 0.09 509 7 97 040 Cl 23 01 24 Cl 23 0 8745 040 2.79 3818 500 0.83 592 7.97 035 Cl 24 Cl 25 Cl 24 03778 040 1.20 4 196 5.00 1.02 6.94 7 97 0.30 Cl 25 Cl 26 C125 01561 040 049 4 351 500 1.08 802 797 026 Cl 26 Cl 28 Cl 26 06060 040 1.93 4 957 500 119 921 797 024 Cl 28 Cl 29 Cl 28 04510 040 1 44 5408 500 158 10.79 797 019 Cl 29 Cl 31 Cl 29 0 1500 040 0 48 5558 500 1 79 1258 7 97 0 16 Cl 31 Cl 32 CI 31 0 1870 040 060 5745 500 1 go 14.56 7 97 015 Cl 32 Cl 33 Cl 32 1 1739 040 3.74 6919 5.00 2.20 16 76 7 97 012 Cl 33 Cl 34 CI 33 00410 040 0 13 6960 5.00 223 1899 7 97. 0 12 Cl 34 JB I Cl 34 00370 090 0 27 6997 500 234 21.33 7 97, 022 OUTLET JB.1. 00000 0 30 000 6997, 5 00 255 2388 _..797 008 Cl 27 Cl 28 Cl 28 0 0690, 090 049 0069. 5.00 000 5.00 7 97. 090 Cl 30 Cl 31 Cl 33 00517. 090 037 0.052 5 00 000 500 7 97 090 Cl 22 Cl 23 Cl 22 0 3905 060 1.87 0.391. Soo 0 co Soo .......797 060 cl 35 cl 36 Cl 35 00970 090 0.70 0.097 500 0 co 5 00 7 97 090 Cl 36 C137 Cl 36 13051 040 4 16 1.402 500 009 509 797 039 Cl 37 C138 Cl 37 08840 040 2.82 2.286 5.00 086 594 7 97 0 34 Cl 38 Cl 34 cl 38 00550 090 0.39 2341. 500 092 686 797 066 s 11351 a00 I St- D-,, HG L 10-Y., Data. V I 5Y2021 11- 11:.- Page 1 of 4 DOUBLE 0 ENGINEERING, PLLC 150 S. Page Street 1, 21�§IiE DATE 03/15/21 DESIGN PHASE PRELIM /X PROJECT NO Southern Pines, NC 28387 PROJECT NAME CONSTR (910) 684-8646 Blackhawk Landing DD2005 REVISION LOW ON BY P-1 275 RECORD Hoke County, NC JLH OTHER CHECKED BY (SPECIFY) I DTU nz 0 013 STORM DRAINAGE SCHEDULE CONTINUED CONTINUED 9= 195 h= 22 SIDE. CAPACITY SEGMENT U LOWER UPSTREAM TOP FROM TO DISCHARGE STREAM SLOPE CIA (FULL) 11111 LENGTH TIME INV. 'ER INV. V ELEV. ICFS) �CFS) IN (CFS) (FPS ) (FT) CI I C 1 2 636 0.00 00100 18 10.5 59 2200 006 204 00 20389 207.38 Cl 2 Cl 4 1067 000 00084 18 96 54 19935 061 20389 20172 207 38 Cl 4 cl 5 1648 361 00247 24 356 11.3 4037 006 201.72 20118 20612 cl 5 Cl 7 1669 000 00234 24 346 110 162 16 025 20118 19737 205 18 CI 7 CI 8 17 98 048 00496 24 504 160 91.32 0 10 197 37 193 31 201 42 cl 8 cl 9 27.97 900 00135 30 47 7 9.7 94.97 0 16 192 81 190 74 197 31 C19 cl 11 2978 070 00157 30 514 10.5 16052 026 190 74 18856 19524 cl 11 Cl 12 31.33 0 00 00079 30 364 74 2200 005 18821 18804 192 56 CI 12 JB2 32.38 0 00 00079 30 364 7.4 2900 007 188.04 187.81 192.56 JB 2 JB 3 32 38 0 00 00079 30 364 7 4 11900 027 187 81 18687 194 25 JB 3 OUTLET 32 38 0 00 00079 30 364 7.4 8085 0 18 186 87 18623 19425 cl 13 Cl 14 0.83 0 00 00200 18 149 84 2200 004 177 84 177 62 181 06 Cl 14 CI is 1 18 0 00 0 1153 18 357 202 3695 003 17762 17336 181 00 cl 15 Cl 16 1.64 000 00200 18 149 84 2200 004 173.36 17292 17752 cl 16 Cl 17 2.00 000 00190 18 145 82 77.74 0 16 172 92 171.44 177 52 Cl 17 OUTLET 1253 1045 00200 24 320 102 1800.. 003 17143 17106 17543 CI 18 cl 19 10 13 000 00050 24 160 5 1 22 00 007 171 71 171 60 17521 cl 19 cl 17 1045 000 00050 24 160 5 1 3232, 011 17160 17143 17521 C13 C14 361 000 00050 18 74 4 2 22 00 009 20233 20222 206 12 C16 CI 7 048 000 0 0050 18 74 42. 2200, 0.09 19792 197.88 20142 cl 10 cl 9 070 Goo 00050 18 74 42 2200 009 19174. 191.63 19524 cl 39 018 900 000 00129 18 119 6 7 116 31 029 19500 193 50 19820 Cl 12 Cl 11 1 05 a 00 00050 18 7 4 4 2 2200. 0 09 18906 18695 19256 Cl 20 cl 21 1 73 0 00 00050 18 7 4 42 2200 009 200 22 200 11 20372 Cl 21 CI 23 938 000 00086 18 97 5 5 244 79 074 200 11 197 97 203 72 Cl 23 Cl 24 14 04 1 87 00154 24 281 89 105 19 020 197 47 195 85 201 33 Cl 24 Cl 25 1524 000 00100 24 226 7 2 22 00 0 05 19585 195 74 199 80 Cl 25 Cl 26 15 74 000 0 0259 24 364 11 6 81 72 0 12 195 74 19362 199 85 Cl 26 Cl 28 1767 Goo 00050 24 160 5 1 11664 038 19362 19304 19823 Cl 28 Cl 29 1960 049 00050 30 290 5 9 7547 021 19254 19216 19735 Cl 29 Cl 31 2008 000 00088 30 385 78 9065 0 19 19216. 19136 19678 Cl 31 Cl 32 2105 037 00050 30 290 5 9 7688 022 191.36 19097 19610 Cl 32 Cl 33 24 79 000 00200 30 580 11 8 2200. 003 190 97 19053 195 76 Cl 33 Cl 34 2492 000 00100 30 410 8 3 5740, 011 19052 18995 19576 Cl 34 je 1 3326 807 00200 30 580 11 a 142 50, 020 18945 18802 19594 JB I OUTLET 3326 000 00100 30 410 8.3 3800 008 188.02 18764 19550 Cl 27 Cl 28 049 000 00050 18 74 4 2 22 00. 009 194 06 19384 19735 Cl 30 Cl 31 0 37 Goo 00050 18 74 4 2 2200. 009 192 03 191 92 19643 Cl 22 Cl 23 187 000 00050 18 74 4 2 2200. 009 19808 19797.., 20133 CI 35 Cl 36 0 70 000 00050 18 74 4 2 2200 009 194 11 194 00 19761 CI 36 C137 4 86 0 00 0 0050 18 74 4 2 19350 077 19400 19303 19761 Cl 37 C138 767 0.00 00100 18 105 59 2200 006 19303 19281 19660 Cl 36 Cl 34 807 coo 00050 18 74 42 12884 051 19231 19167 19660 a I 115, NOOl 0. .- b- .1- HGL 10.1-1 - 31IS2021 T- 11 45 AM P.gI, 2 0f 4 DOUBLE D ENGINEERING, PLLC 150 S. Page Street folp DATE 03/15/21 DESIGN PHASE PRELIM /X Southern Pines, NC 28387 PROJECT NAME PROJECT NO CONsrn I (910) W-8646 Blackhawk Landing DD2005 REVISION LOCATION BY P-1 275 RECORD Hoke County, NC JLH OTHER --j CHECKED BY (SPECIFY) DTIJ n= 0.013 HYDRAULIC GRADE LINE CONTINUED 1= 195 BEND LOSS WS h= 22 90 DEG=O 7 30 DEG''=Q 28 PIPE HYDRAULIC DE.TREA 60 DEG=0 55 HEAD L.S. 15 DEG=O 10 FRICTION FICTION FROM TO AREA SUMMATION BAD S UMMAI RADIUS ON H H� 17� LOSS E VELOCITY FT � (FT) (CFS K �FTIFT� tFPS) C I I C 1 2 17671 03750 000 014 009 000 000 022 000 00063 4 71 CI 2 CI 1 7671 0 3750 000 203 0 14 0 12 000 2 30 000 0 0103 601 Cl 4 Ct 5 3 1416 05000 361 021 011 020 000 051 000 0 01)53 522 CIS Cl 7 3 1416 05000 coo 0 88 0 11 0 15 000 1 13 000 00054 528 Cl 7 Cl 8 3 1416 05000 048 057 0 13 0 15 000 0 85 000 00063 5 70 CI 8 cl 9 4 9087 06250 900 044 0 12 018 000 074 000 00046 567 cl 9 cl 11 49087 06250 0 70 084 0 14 0 17 0 00 1 15 000 00052 603 Cl 11 Cl 12 4 9087 06250 000 0 13 0 16 020 000 048 000 00058 6 34 Cl 12 JB 2 49087 06250 000 018, 017 022 000 056 Goo 00062 656 J8 2 J8 3 4 9087 06250 000 073 017 023 000 1 14 000 000132 6 56 JB 3 OUTLET 4 9087 0 625D 000 050 0 17 0 23 000 090 0 00 0 0062 656 cl 13 CI 14 1 7671 03750 0 cc 000 000 000 000 000 000 00001 047 Cl 14 Cl 15 1 7671 03750 000 000 0 00 022 000 023 000 00001 067 cl 15 Cl 16 1 7671 03750 000 001 000 Goo 000 001 000 00002 092 cl 16 Cl 17 1 7671 03750 000 003 000 000 0 00 004 000 00004 1.12 Cl 17 OUTLET 3 1416 05000 1045 005 006 000 000 0.12 coo 00030 397 cl 18 CI 19 31416. 05000 000 004, 004 000 000 008 000 00020 321 cl 19 Cl 17 31416 05000 0100 007 004 006 000 017 000 00021 331 C13 Cl 4 1 7671 03750 a 00 003 0 02 002 0 co 006 000 00012 204 C16 Cl 7 1 7571 03750 000 000 000 000 000 000 000 00000 027 cl 10 C19 1 7671 03750 000 0 00 000 000 000 0 00 000 0 0000 0 39 CI 39 cl a 17671 03750 000 085 010 000 000 095 000 00073 $07 cl 12 cl 11 1 7671 03750 000 000 000 000 0 00 001 000 0 0001 0 59 Cl 20 Cl 21 1 7671 03750 000 001 000 0 00 0 00 0 01 000 00003 0.97 Cl 21 Cl 23 17671 03750 000 194 011 001 000 206 000 00079 529 Cl 23 Cl 24 3 1416 0 5000 1 87 040 0 08 0 15 0 00 063 000 00038 4 45 Cl 24 Cl 25 3 1416 0 5000 000 0 10 009 0 11 000 0 30 000 00045 4.83 Cl 25 Cl 26 3 1416 05000 0 00 039 0 10 0 13 000 062 000 00048 4 98 Cl 26 Cl 28 3 1416 05000 000 0 71 0 12 0 13 000 096 a 00 00061 560 Cl 28 Cl 29 4 9087 06250 049 017 006 017 000 040 000 00023 397 Cl 29 cl 31 4 9087 06250 000 022 006 0 09 000 0 37 000 00024 4 07 Cl 31 Cl 32 49087 06250 037 020 007 009 000 036 000 00026 420 Cl 32 Cl 33 4 9087 06250 000 006 0 10 0 10 000 028 000 0 0036 502 Cl 33 Cl 34 4 9087 06250 000 021 0 13 0 14 000 045 000 00037 505 Cl 34 JB 1 4 9067 06250 8 07 093 0 18 0 14 coo 1 24 000 00065 6 73 JB I OUTLET 4 9087 06250 000 025 0 IB 025 000 067 0 00 00065 673 Cl 27 Cl 28 1 7671 0 3750 0 00 000 000 000 000 000 0 00 00000 028 Cl 30 Cl 31 1 7671 03750 000 000 0 00 000 000 000 000 0 0000 021 Cl 22 Cl 23 1 7671 0 3750 000 001 000 0 00 0 00 001 0 00 00003 1 05 Cl 35 cl 36 1 7671 0 3750 000 000 000 000 000 000 000 0 00co 039 cl 36 Cl 37 C137 C138 1 7671 1 7671 03750 03750 000 000 041 D 12 003 007 000 004 000 000 044 023 000 000 0002.1 0 0063 2 74 4 32 Cl 38 Cl 34 17671 03750 000 0 76 008. 0 10 000 0 94 000 00059 455 -1. Dr— nGl 1(41-1 D- 1152021 T— 11 45 AM Page 3014 DOUBLE D ENGINEERING, PLLC 150 S. Page Street DATE 03/15/21 DESIGN PHASE PRELIM /X Southern Pines, NC 28387 PROJECT NAME PROJECT NO CONSTR L-/ (910) 684-8646 Backhawk Landing DD2005 REVISION LOCATION BY P-1 275 RECORD Hoke County, NC AH OTHER CHECKED BY (SPECIFY) DTU DESIGN CRITERIA o oli HYDRAULIC GRADE LINE - CONTINUED 1 DESIGN FOR THE 10 YR STORM 195 2 ASSUME TIME OF CONCENTRATION TO h= 22 AN INDIVIDUAL INLET = 5 MIN (Unleat, othetwlse noted) OUTLET INLET W.S. rLEV FLOW FREE- 3 INTENSITY - g/(h,T), FOR 10 YR STORM (9 ad IT, were derived India Raleigh -Durham Intensity - INLET' US i"T, FROM TO WSE CONDITION BOARD COMMENTS Duration Frequency Chains, REF NC Erosion and JFT CONTROL (FTt Sediment Control Planning and Design Manual) Cl 1 Cl 2 20621 20644 20572 20644 OUTLET 094 OK Cl 2 C14 203 91 20621 206 21 20621 INLET 117 OK Cl 4 Cl 5 20340 20391 20391 20391 OUTLET 221 OK C15 Cl 7 19978 20092 20340 20340 INLET 1 78 OK Cl 7 CIS 19546 196 31 19978 199 78 INLET 164 OK Cl 8 Cl 9 19358 194.32 19546 19546 INLET 185 OK CIS Cill 19218 19333 19358 19358 'INLET 166 OK CI 11 Ct 12 191 70 19218 191 22 19218 OUTLET 038 OK C112 JB 2 19113 19170 19116 19170 OUTLET 086 OK JB 2 JB 3 19000 19113 19094 19113 OUTLET 312 OK J8 3 OUTLET 18823 18913 19000 19000 INLET 425 OK In, Out= 18623 Cl 13 C114 17882 17882 17860 17882 OUTLET 224 OK Cl 14 C115 17456 17479 17839 17839 INLET 261 OK Cl 15 Clie 17412 17413 17415 17415 INLET 337 OK Cl 16 C117 173 12 17315 173 73 17373 INLET 3.79 OK Cl 17 OUTLET 17266 172 78 17312 17312 INLET 231 OK Inv. Out= 171 06 Cl 18 C119 17320 17328 17316 17328 OUTLET 193 OK Cl 19 C117 17303 17320 17308 17320 OUTLET 201 OK Inv, Out = 171,43 C13 Ct4 20342 20348 20326 20348 OUTLET 264 OK Inv, Out = 202.22 CIE C17 19908 19908 19867 19908 OUTLET 2.34 OK Inv. Out= 197.88 Clio CI 19283 192 83 192 50 192 83 OUTLET 241 OK Inv. Out 191.63 CI 30 CI 6 19470 19565 19687. 19687 INLET 1.33 OK Inv. Out = 193,50, C112 Cl 11 190.15 190.16 18983 19016 OUTLET 240 OK Inv. Out= 188.95 C120 Cl 21 20208 20209 201 01 20209 OUTLET 163 OK C121 C123 199.33 201.39 20206 20208 INLET 164 OK C123 C124 198.12 19875 19933 19933 INLET 2.00 OK C124 C125 197.82 198.12 19787 19812 OUTLET 1.68 OK C125 C125 19598 19660 19782 19782 INLET 203 OK C126 C128 19464 19560 19598 19598 INLET 225 OK C128 C129 194 16 19456 194 46 194 515 OUTLET 2 79 ON C129 Cl 31 19376 19413 19413 19413 INLET 265 OK CI 31 C132 19340 193 76 19340 193 70 OUTLET 2.34 OK C132 C133 193.13 19340 19332 19340 OUTLET 236 OK C133 Cl 34 19268 19313 19288 193 la OUTLET 263 OK Cl 34 JB 1 19125 19249 19268 19268 INLET 326 OK JB I OUTLET 18964 19031 19125 19125 INLET .425 OK_.... Inv. Out =, 187,84, C127 C128 19504 19504 19481 19504 OUTLET 231 OK In, Out =. 193.84 Cl 30 CI 31 103.12 193 12 192 78 19312 OUTLET 331 OK Inv, Out = 191S2 CI 22 C123 79917 19918 19888 19918 OUTLET 215 OK Inv. Out = 197.97 C135 C136 19520 19520 194 87 19520 OUTLET 2 41 OK C136 C137 194.59 19503 19508 19506 INLET 253 OK C137 C138 19401 19424 19459 19459 INLET 201 OK C138 C134 192 87 193 61 19396 19396 INLET 264 OK Inv, Out= 191,67 a 11 a5 IWO al —Dram nGL 10--, D- 01152071 T— t 1 45 AM Page 4 of 4