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HomeMy WebLinkAboutSW3230602_Supplement-EZ Form_20230914 SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 Project Name Cavalry Ridge-Ph1 2 Project Area(ac) 14.68 3 Coastal Wetland Area(ac) 0 4 Surface Water Area(ac) 0 5 Is this project High or Low Density? Low 6 Does this project use an off-site SCM? No COMPLIANCE WITH 02H.1003(4) r� _ 7 'Width of vegetated setbacks provided(feet) 35 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: Matthew C.Kirchner 28 Organization: Eagle Engineering,Inc 29 Street address: 2013-A Van Buren Ave 30 City,State,Zip: Indian Trail,NC 28079 31 Phone number(s): 704-882-4222 32 Email: mkirchner@eagleonline.net 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 \\\\111111//, �•� N C"C i/,�� O Signature of Designer SEAL 04550 • tiFw K�� 09/07/2023 '/i,//I I lsaar\\436715/2023 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 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 Roadside Swale Roadside Swale 5 Total drainage area(sq ft) 639614 639614 6 Onsite drainage area(sq ft) _ 639614 639614 7 Offsite drainage area(sq ft) - - 8 Total BUA in project(sq ft) 153417 sf 153417 sf New BUA on subdivided lots(subject to 9 permitting)(sq ft) 124272 sf 124272 sf New BUA not on subdivided lots(subject to 10 permitting)(sf) 7965 sf 7965 sf 11 Offsite BUA(sq ft) - - 12 Breakdown of new BUA not on subdivided lots: --Parking(sq ft) 815 sf 815 sf -Sidewalk(sq ft) 385 sf 385 sf -Roof(sgft) --Roadway(sq ft) 3410 sf 3410 sf -Future(sq ft) --Other,please specify in the comment box below(sq ft) 3355 sf 3355 sf New infiltrating permeable pavement on 13 subdivided lots(sq ft) -New infiltrating permeable pavement not on 14 subdivided lots(sq ft) - - Existing BUA that will remain(not subject to 15 permitting)(sq ft) 21180 sf 21180 sf 16 Existing BUA that is already permitted(sq ft) - - 17 Existing BUA that will be removed(sq ft) - - 18 Percent BUA 24% 24% 19 Design storm(inches) 1.0 in 1.0 in 20 Design volume of SCM(cu ft) n/a n/a 21 Calculation method for design volume n/a n/a ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): All runoff is conveyed through vegetated roadside ditches.There are no proposed SCMs on site.'Other'BUA accounts for portions of proposed driveways inside the right-of-way 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) 3H:1V 5 Maximum velocity in the vegetated conveyances during the 10-year storm? 3.43 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? 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? I No ADDITIONAL INFORMATION 15 Please use this space to provide any additional information about this low density project: Vegetated road side swales provided with erosion control matting to accommodate slope stability. I Drainage Pervious Swale BUA Q Slope wallow Vaauai Flow depth Area area C # (ac) (cfs) (%) (fps) (fps) (ft) (ac) (ac) 1 0.52 0.26 0.26 0.40 1.01 3.00 4.50 2.48 0.40 2 0.56 0.13 0.43 0.40 1.34 4.10 4.50 2.93 0.39 3 0.85 0.22 0.63 0.40 2.04 4.40 4.50 3.43 0.45 4 1.04 0.20 0.84 0.40 2.51 2.20 4.50 2.66 0.56