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HomeMy WebLinkAboutSW4230701_Supplement-EZ Form_20240621 DocuSign Envelope ID: 1 EF6A072-09C7-43E3-B13D-4A1A0F55F141 SUPPLEMENT-EZ COVER PAGE FORMS LOADED jROJECT INFORMATION 1 Project Name High Meadows,Sec 2 2 Project Area(ac) 14.84 3 Coastal Wetland Area(ac) _ _ 0 4 Surface Water Area(ac) 0.073 5 Is this project High or Low Density? Low 6 Does this project use an off-site SCM? No COMPLIANCE WITH 02H.1003(4) 7 Width of vegetated setbacks provided(feet) 30 8 Will the vegetated setback remain vegetated? Yes 9 If BUA is proposed in the setback,does it meet NCAC 02H.1003(4)(c-d)? N/A 10 Is streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCMs: • 11 'Infiltration System 12 Bioretention Cell 13 Wet Pond 14 Stormwater Wetland 15 Permeable Pavement 16 Sand Filter 17 Rainwater Harvesting(RWH) 18 Green Roof 19 Level Spreader-Filter Strip(LS-FS) 20 Disconnected Impervious Surface(DIS) 21 Treatment Swale 22 Dry Pond 23 StormFilter 24 Silva Cell 25 Bayfilter 26 Filterra FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: Alex Carter,PE 28 Organization: Beeson&Carter,PA 29 Street address: 4510 Reidsville Road 30 City,State,Zip: Winston Salem,NC 27101 31 Phone number(s): 336-748-0071 32 Email: acarter@bc-eng.com 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. Designer O▪ S /0C/,17\, Signature of Designer • 038574 • 'V s',▪••.4/GINEde T"C � •��` 6/21/2024 6/21/2024 Date DocuSign Envelope ID: 1 EF6A072-09C7-43E3-B13D-4A1A0F55F141 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 Is all/part of this project subject to previous rule 5 versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site LD 1 4 Type of SCM Vegetated Vegetated 5 Total drainage area (sq ft) 646565 646565 6 Onsite drainage area (sq ft) 646565 646565 7 Offsite drainage area (sq ft) 8 Total BUA in project(sq ft) 138350 sf 138350 sf New BUA on subdivided lots (subject to _ 9 permitting) (sq ft) 88000 sf 88000 sf New BUA not on subdivided lots (subject to 10 permitting) (sf) 50350 sf 50350 sf 11 Offsite BUA(sq ft) 12 Breakdown of new BUA not on subdivided lots: - Parking (sq ft) sf -Sidewalk (sq ft) sf - Roof(sq ft) sf - Roadway(sq ft) 50350 sf 50350 sf - Future (sq ft) sf -Other, please specify in the comment box below(sq ft) sf New infiltrating permeable pavement on 13 subdivided lots (sq ft) sf New infiltrating permeable pavement not on 14 subdivided lots (sq ft) sf Existing BUA that will remain (not subject to 15 permitting) (sq ft) sf 16 Existing BUA that is already permitted (sq ft) sf 17 Existing BUA that will be removed (sq ft) sf 18 Percent BUA 21% 21% 19 Design storm (inches) 20 Design volume of SCM (cu ft) 21 Calculation method for design volume ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): See sheet C-4.1 for more details on drainage areas. Site is low density and uses vegatated conveyances to the maximum extent pratical. DocuSign Envelope ID: 1 EF6A072-09C7-43E3-B13D-4A1A0F55F141 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) 3:1 5 Maximum velocity in the vegetated conveyances during the 10-year storm? 8.10 6 Are curb outlet swales proposed? No 7 Maximum longitudinal slope of curb outlet swale(s)(%) _ 8 Bottom width of curb outlet swale(s)(feet) 9 Maximum side slope of curb outlet swale(s)(H:V) 10 Minimum length of curb outlet swale(s)(feet) _ 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 Are variations to rule.1003 proposed? No ADDITIONAL INFORMATION 15 Please use this space to provide any additional information about this low density project: This site is the final phase of an existing residential development with lots platted in 1975,1978 and 1995. The site will utilize side ditches that are periodically piped for outletting between lot areas in keeping with existing ties to ribbon pave/side ditch stub streets. Piping is periodically needed to prevent excessive storm water buildup in the side ditches creating greater possibility of erosion. All piped side ditch piping outlets to riprap outlet aprons and vegetated swales that meet the MDC requirements to disperse the flow on the low side of the site. No SCMs are proposed for this site. Drainage Pervious Swale Area BUA area C Q Slope Vallow Va«ua, Flow depth # (ac) (ac) (ac) (cfs) (%) (fps) (fps) (ft) 1 2.11 0.41 1.70 0.40 5.83 1.21 5.00 2.57 0.87 2 0.51 0.11 0.40 0.40 1.34 1.21 5.00 1.79 0.50 3 2.62 0.00 2.62 0.40 7.17 12.90 9.50 8.10 0.30 4 0.77 0.28 0.49 0.40 2.13 10.50 5.00 4.44 0.40 5 0.87 0.32 0.55 0.40 2.40 6.10 5.00 3.78 0.46 6 1.57 0.62 0.95 0.65 7.05 10.50 9.50 7.76 0.55 7 0.46 0.07 0.39 0.40 1.27 11.95 5.00 4.13 0.32 8 0.82 0.16 0.66 0.40 2.27 11.95 5.00 4.73 0.40 9 1.09 0.16 0.93 0.40 3.01 2.89 5.00 2.98 0.58 10 0.76 0.12 0.64 0.40 2.10 2.89 5.00 2.69 0.51 11 0.84 0.12 0.72 0.40 2.32 2.89 5.00 2.75 0.53 12 1.14 0.16 0.98 0.40 3.00 20.80 9.50 5.73 0.12 13 0.87 0.16 0.71 0.40 2.30 18.60 9.50 4.78 0.12 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30