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Home My WebLink AboutSW4210801_Supplement-EZ Form_20220421SUPPLEMENT-EZ COVER PAGE PROJECT INFORMATION 1 Project Name ....�,..,...,<,,..,.�._..,. w....�_.a....�....,�.�,.....�._-,,�.... .,...,�.,y.-nm..m._ 2 Project Area (ac) _ 3 Coastal Wetland Area (ac) _ - ----- -- -- - -- -------- --- 4 Surface Water Area (ac) 5 Is this project High or Low Density? 6 Does this proiect use an off -site SCM? Holt Farm Aft No COMPLIANCE WITH 02H .1003(4) ..,.:._.::..,,.v:........,.,..�..., ..._o.,:..... , �.,�.. 7 .Width of vegetated setbacks provided (feet) 8 Will the vegetated setback remain vegetated? N/A 9 If BUA is proposed in the setback, does it meet NCAC 02H.1003(4)(c-d)? 10 Is streambank stabilization proposed on this project? No 11 iInfiltration System 0 12 Bioretention Cell _. - - 13 Wet Pond 0 14 Stormwater Wetland 0 15 Permeable Pavement 0 _ 16 Sand Filter 0 -17 Rainwater Harvesting (RWH) _ _ -- --------- -.._ - 0 18 Green Roof 0 19 Level Spreader -Filter Strip (LS-FS) 0 20 Disconnected Impervious Surface (DIS) - ---- 0 _ 21 Treatment Swale - — -- - ------ -- -0 22 Dry Pond 0 23 StormFilter 0 24 Silva Cell 0 .__.-------- 25 Bayfilter 0 0 ORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: Chad E. Abbott, PE 28 Organization: C3 Design and Engineering, PLLC 29 Street address: 2537 East Lyon Station Road, Suite 102 30 City, State, Zip: Creedmoor, NC 27522 31 Phone number(s): .. _ 919-230-0996 32 Email: - shad@c3designeng.com I --- Certification Statement: I certify, under penalty of law that this Supplement-EZ form and all supporting information were prepared under my direction or supervision; that the information provided In the form is, to the best of my knowledge and belief, true, accurate, and complete; and that the engineering plans, specifications, operation and maintenance agreements and other supporting information are consistent with the information provided here. `X�� t C A R01'// �� ;a SEAL 4 �Z/�,•' Signature of Designer � Date DRAINAGE AREAS 1 Is this a high density project? No 2 If so, number of drainage areas/SCMs 0 3 Does this project have low density areas? Yes 4 If so, number of low density drainage areas 1 5 Is all/part of this project subject to previous rule versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site LID 1 4 Type of SCM NA 5 Total drainage area (sq ft 1023201 6 Onsite drainage area (sq ft 1023201 7 Offsite drainage area (sq ft) 0 8 Total BUA in project (sq ft) 141052 sf 9 New BUA on subdivided lots (subject to permitting) (sq ft 108000 sf 10permitting) New BUA not on subdivided lots (subject to s 33052 sf 11 Offsite BUA (sq ft sf 12 Breakdown of new BUA not on subdivided lots: Parkin (sq ft Sidewalk (sq ft Roof (sq ft) Roadway s ft 30154 sf Future (sq ft) sf Other, please specify in the comment box below (sq ft 2898 sf 13 New infiltrating permeable pavement on subdivided lots (sq ft) sf 14 New infiltrating permeable pavement not on Isubdivided lots (sq ft sf 15permitting) Existing BUA that will remain (not subject to s ft sf 16 Existing BUA that is already permitted (sq ft 13816 sf 17 Existing BUA that will be removed (sq ft) 13816 sf 18 Percent BUA 13% 19 Design storm (inches) NA 20 Design volume of SCM cu ft NA 21 1 Calculation method for design volume NA ADDITIONAL INFORMATION 22 Please use this space to provide any additional information about the drainage area(s): Property has two drainage area (DA), but summarized in one DA since the mafority of proposed impervious area are located in one specific DA. Other BUA not on subdivided is gravel drive and other concrete area such as fire tuck turning area or mail kiosk. LOW DENSITY DESIGN REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H .1003 1 Is project below density thresholds set forth in the applicable stormwater rule? Yes 2 Does project maximize dispersed flow and minimize channelization of flow? Yes 3 Has the use of piping been minimized per.1003(2)(c)? Yes 4 Side slopes of the vegetated conveyances (H:V) 3 sf 5 Maximum velocity in the vegetated conveyances during the 10-year storm? 4.23 6 Are curb outlet swales proposed? No 7 Maximum longitudinal slope of curb outlet swale(s) (%) N/A 8 Bottom width of curb outlet swale(s) (feet) N/A 9 Maximum side slope of curb outlet swale(s) (H:V) N/A 10 Minimum length of curb outlet swale(s) (feet) N/A 11 Are treatment swales used instead of curb outlet swales? Yes 12 Is stormwater released at the edge of the setback as dispersed flow? Yes 13 Have stormwater outlets been designed to prevent downslope erosion? Yes 14 lAre variations to rule .1003 proposed? No ADDITIONAL INFORMATION 15 Please use this space to provide any additional information about this low density project: Swale#1 is DWD-1/PD-1 Swale#2 is DWD-2/PD-2 Swale#3 is DWD-3/PD-3 Swale#4 is DWD-4/PD-4 Swale#5 is CWD-1 Swale#6 is CWD-2 Please refer to sheet C-1.1 for diversion/ditch schedule Swale # FDrainage Area ac BUA (ac) Pervious area ac C Q (cfs) Slope ( % ) Va„ow (fps) Va ua (fps) Flow depth (ft) 1 5.92 0.32 5.60 0.24 10.16 1.85 8.00 4.48 0.87 2 6.16 0.07 6.09 0.21 9.17 1.66 8.00 4.20 0.85 3 2.91 0.25 2.66 0.26 5.50 1.96 8.00 3.93 0.68 4 1.64 0.07 1.57 0.23 2.72 1.85 8.00 3.23 0.53 5 7.74 0.00 7.74 0.20 11.07 1.17 8.00 3.86 0.98 6 5.97 0.00 5.97 0.20 8.53 1.77 8.00 4.23 0.82 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Diversion / Ditch Schedule Name Q10 cs V70 s Sies opes X1 Slope (%) Dept Flow Dept Shear Stress s Lining DWD-1/PD-1 10.16 4.48 3 1.85% 1.50 0.87 1.00 NAG-SC150 DWD-21PD-2 9.17 4.20 3 1.66% 1.50 0.85 0.88 NAG-SC150 DWD-31PD-3 5.50 3.93 3 1.96% 1.50 0.68 0.83 NAG-SC150 DWD-41PD-4 2.72 3.23 3 1.85% 1.50 0.53 0.61 NAG-SC150 CWD-1 11.07 3.86 3 1.17% 1.50 0.98 0.71 NAG-SC150 CWD-2 8.53 4.23 3 1.77% 1.50 0.82 0.91 NAG-SC150 DESIGN & 2537 E. Lyon Station Roa Suite 102, PO Box0361 FIRM LICA LENGINEERING, PLLC Creedmoor, NC 27522 P-1764 919-230-0996 Project NO: 20-085 Calculated/ Joel H. Sain, EIT Project Name: Holt Farm Prepared by: 4601 Mt. Hermon Rock Creek Project Location: Checked by: Chad E. Abbott, PE Road, Snow Camp, NC 27349 Diversion / Ditch Schedule Calculations Diversion / ditch name: DWD-1/PD-1 Impervious coefficient number (Cl) 0.95 Impervious area 13,822 sf 0.32 ac Pervious coefficient number (C2) 0.20 Pervious area 243,836 sf 5.60 ac Diversion / ditch coefficient number (CJ 0.24 Intensity (1) 7.15 in/hr Peak flow (Q10); Q = C x I x A = 1.49 / n x AW x R2/3 x S0.5 10.16 cfs Start elevation 657.00 ft sf Ift Ift Ift Stop elevation 640.00 Length 921 Slope (S) 1.85% Sideslopes (X:1) 3 n-value 0.025 Wet area (AW) 2.27 Wet parameter (W) 5.50 ft Hydrulic radius (R) 0.41 Total Depth 1.50 ft Depth of flow 0.87 Shear stress 1.00 Ibs/sf Free board 0.63 Velocity (V10) 4.48 ft/s Lining: I NAG-SC150 Diversion / ditch name: I DWD-2/PD-2 Impervious coefficient number (Cl) 0.95 Impervious area 2,989 sf 0.07 ac Pervious coefficient number (C2) 0.20 Pervious area 265,085 sf 6.09 ac Diversion / ditch coefficient number (CJ 0.21 Intensity (1) 7.15 in/hr Peak flow (Q10); Q = C x I x A = 1.49 / n x AW x R2/3 x S0.5 9.17 cfs Start elevation 641.00 ft sf Ift Ift Ift Stop elevation 638.00 Length 181 Slope (S) 1.66% Sideslopes (X:1) 3 n-value 0.025 Wet area (AW) 2.18 Wet parameter (W) 5.40 ft Hydrulic radius (R) 0.40 Total Depth 1.50 ft Depth of flow 0.85 Shear stress 0.88 Ibs/sf Free board 0.65 Velocity (V10) 4.20 ft/s Lining: I NAG-SC150 & 2537 E. Lyon Station Roa Suite 102, PO Box0361 FIRM LICA L:SIDEESIGN ENGINEERING, RLLC Creedmoor, NC 27522 P-1764 919-230-0996 Project NO: 20-085 Calculated/ Joel H. Sain, EIT Project Name: Holt Farm Prepared by: 4601 Mt. Hermon Rock Creek Project Location: Checked by: Chad E. Abbott, PE Road, Snow Camp, NC 27349 Diversion / Ditch Schedule Calculations Diversion / ditch name: DWD-3/PD-3 Impervious coefficient number (Cl) 0.95 Impervious area 10,909 sf 0.25 ac Pervious coefficient number (C2) 0.20 Pervious area 115,821 sf 2.66 ac Diversion / ditch coefficient number (CJ 0.26 Intensity (1) 7.15 in/hr Peak flow (Q10); Q = C x I x A = 1.49 / n x AW x R2/3 x S0.5 5.50 cfs Start elevation 657.00 ft sf Ift Ift Ift Stop elevation 637.00 Length 1023 Slope (S) 1.96% Sideslopes (X:1) 3 n-value 0.025 Wet area (AW) 1.40 Wet parameter (W) 4.32 ft Hydrulic radius (R) 0.32 Total Depth 1.50 ft Depth of flow 0.68 Shear stress 0.83 Ibs/sf Free board 0.82 Velocity (V10) 3.93 ft/s Lining: I NAG-SC150 Diversion / ditch name: I DWD-4/PD-4 Impervious coefficient number (Cl) 0.95 Impervious area 3,016 sf 0.07 ac Pervious coefficient number (C2) 0.20 Pervious area 68,551 sf 1.57 ac Diversion / ditch coefficient number (CJ 0.23 Intensity (1) 7.15 in/hr Peak flow (Q10); Q = C x I x A = 1.49 / n x AW x R2/3 x S0.5 2.72 cfs Start elevation 657.00 ft sf Ift Ift Ift Stop elevation 640.00 Length 921 Slope (S) 1.85% Sideslopes (X:1) 3 n-value 0.025 Wet area (AW) 0.84 Wet parameter (W) 3.35 ft Hydrulic radius (R) 0.25 Total Depth 1.50 ft Depth of flow 0.53 Shear stress 0.61 Ibs/sf Free board 0.97 Velocity (V10) 3.23 ft/s Lining: I NAG-SC150 & 2537 E. Lyon Station Roa Suite 102, PO Box0361 FIRM LICA L:SIDEESIGN ENGINEERING, RLLC Creedmoor, NC 27522 P-1764 919-230-0996 Project NO: 20-085 Calculated/ Joel H. Sain, EIT Project Name: Holt Farm Prepared by: 4601 Mt. Hermon Rock Creek Project Location: Checked by: Chad E. Abbott, PE Road, Snow Camp, NC 27349 Diversion / Ditch Schedule Calculations Diversion / ditch name: CWD-1 Impervious coefficient number (Cl) 0.95 Impervious area 0 sf 0.00 ac Pervious coefficient number (C2) 0.20 Pervious area 337,130 sf 7.74 ac Diversion / ditch coefficient number (CJ 0.20 Intensity (1) 7.15 in/hr Peak flow (Q10); Q = C x I x A = 1.49 / n x AW x R2/3 x S0.5 11.07 cfs Start elevation 656.00 ft sf Ift Ift Ift Stop elevation 643.00 Length 1115 Slope (S) 1.17% Sideslopes (X:1) 3 n-value 0.025 Wet area (AW) 2.87 Wet parameter (W) 6.19 ft Hydrulic radius (R) 0.46 Total Depth 1.50 ft Depth of flow 0.98 Shear stress 0.71 Ibs/sf Free board 0.52 Velocity (V10) 3.86 ft/s Lining: I NAG-SC150 Diversion / ditch name: I CWD-2 Impervious coefficient number (Cl) 0.95 Impervious area 0 sf 0.00 ac Pervious coefficient number (C2) 0.20 Pervious area 259,850 sf 5.97 ac Diversion / ditch coefficient number (CJ 0.20 Intensity (1) 7.15 in/hr Peak flow (Q10); Q = C x I x A = 1.49 / n x AW x R2/3 x S0.5 8.53 cfs Start elevation 657.00 ft sf Ift Ift Ift Stop elevation 641.00 Length 904 Slope (S) 1.77% Sideslopes (X:1) 3 n-value 0.025 Wet area (AW) 2.02 Wet parameter (W) 5.19 ft Hydrulic radius (R) 0.39 Total Depth 1.50 ft Depth of flow 0.82 Shear stress 0.91 Ibs/sf Free board 0.68 Velocity (V10) 4.23 ft/s Lining: I NAG-SC150 TEMPORARY Designip Product Description Longevity Applications Permissible Shear lbs/ft' Velocity ft/s (m/s) ERONET Stress (Pa) IS lb., accelerated photodegradable, polypropylene 45 days Low Flow Channels Unvegetated 1.SS (74) Unvegetated 5.0 (1.52) top net, 100 % straw fiber matrix 4:1 - 3:1 Slopes US75 - IS lb., photodegradable, polypropylene top 5 60 days Moderate Flow Channels Unvegetated 1.75 (84) Unvegetated 6.0 (1.83) bottom net, 100 %straw fiber matrix 3:1 - 2:1 Slopes US1S0 1.S lb., photodegradable, polypropylene top net, Low Flow Channels Unvegetated Unvegetated S.0 100 % straw fiber matrix 12 months 4:1 - 3:1 Slopes 1.55 (74) (1.52) S75 IS lb., photodegradable, polypropylene top 5 12 months Moderate Flow Channels Unvegetated 1.75 (84) Unvegetated 6.0 (1.83) bottom net, 100 % straw fiber matrix 3:1 - 2:1 Slopes S1s0 2.9 lb., UV -stable polypropylene top net, uOok MediumFlow Channels � 70 %straw/30 % coconut fiber matrix, 1.5 lb., 24 months 2:1Medi Slopes Unvegetated 2.0 (96) Unvegetated 8.0 (2A4) owl photodegradable polypropylene bottom net SG1so Ik 2.9 lb., UV stable polypropylene top B bottom nets, 36 months High Flow Channels Unvegetated 2.25 (108) Unvegetated 10.0 (3.OS) 100 % coconut fiber matrix 1:1 and Greater Slopes C125 BIONET -� 9.3 lb., leno woven biodegradable jute top net, 12 months Low Flow Channels Unvegetated 1.60 (76) Unvegetated 5.0 (1.52) . 100 % straw fiber matrix 4:1 - 3:1 Slopes S75BN op 9.3 lb., leno woven biodegradable jute top net, 100% fiber 7.7lb., biodegradable 12 Moderate Flow Channels Unvegetated 1.85 (88) Unvegetated 6.0 (1.83) straw matrix, woven jute bottom net months 3:1 - 2:1 Slopes S150BN 9.3 lb., leno woven biodegradable jute top net, 70 % Medium Flow Channels straw/30%coconut fiber matrix, 7.7lb., woven 18 months Unvegetated 2.10 (100) Unvegetated 8.0 (244) biodegradable jute bottom net 2:1-1:1 Slopes SC150BN