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Home My WebLink AboutSW6240605_Supplement-EZ Form_20240618 SUPPLEMENT-EZ COVER PAGE PROJECT INFORMATION 1 Project Name Briarwood Bluff Phase II __ 2 Project Area(ac) _ 15.012 3 :Coastal Wetland Area(ac) 0 —� 4 Surface Water Area(ac) 0.0459 5 Is this project High or Low Density? Low '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 IBayfilter 26 Filterra FORMS L.. zD DESIGNER CERTIFICATION 27 Name and Title: Jarrod E. Hilliard,PE,CFM 28 Organization: _ Hilliard Engineering, PLLC 29 Street address: 3417 Winterwind Circle 30 City,State,Zip: Sanford, NC 27330 31 Phone number(s): 919-352-2834 32 Email: jhilliard@hilliardengineering.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 =r of /1" s r • Q. SEAL `; Signe a of D ' ner 035670 • ..11t10ti{itt, tt Seal Date 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) three one 5 Maximum velocity in the vegetated conveyances during the 10-year storm? 2.38 6 Are curb outlet swales proposed? No - - t 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? No 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 T 15 Please use this space to provide any additional information about this low density project: ,. 1. 1 The value in line 5 is in the units of feet per second. Swale Drainage BUA Pervious Q Slope V,,,ow V,n,,,, Flow depth Areac (ac) areac # (cfs) (%) (fps) (fps) (ft) 1 0.3924 0.0912 j 0.3012 I 0.40 I 1.23 ' 0.3-4.7 , 4.50 ; 0.71-2.0 0.45-0.76 2 0.3924 1 0.0912 0.3012 0.40 1.23 0.3-4.87 1 4.50 0.71-2.0 0.45-0.76 3 0.3924 ! 0.0912 0.3012 0.40 1.23 0.3-4.7 I 4.50 0.71-2.0 0.45-0.76 ` 4 0.3924 l 0.0912 0.3012 0.40 1.23 0.3-4.7 4.50 0.71-2.0 0.45-0.76 5 0.3924 0.0912 0.3012 0.40 1.23 0.3-4.7 ; 4.50 0.71-2.0 0.45-0.76 6 0.3924 i--0.0912 0.3012 0.40 1.23 0.3-4.7 4.50 0.71-2.0 0.45-0.76 7 0.3924 I 0.0912 0.3012 0.40 1.23 0.3-4.7 1 l4.50 vt 0.71-2.0 0.45-0.76 8 0.3924 0.0912 0.3012 0.40 1.23 0.3-4.7 I 4.50 0.71-2.0 0.45-0.76 9 0.3924 - 0.0912 0.3012 0.40 1.23 0.3-4.7 ; 4.50 ; 0.71-2.0 0.45-0.76 I-- 10 0.3924 , 0.0912 0.3012 0.40 1.23 0.3-4.7 i 4.50 0.71-2.0 0.45-0.76 11 0.3924 I 0.0912 0.3012 0.40 1.23 0.3-4.7 4.50 I 0.71-2.0 0.45-0.76 12 0.3924 ..0.0912 0.3012 0.40 1.23 0.3-4.7 i 4.50 0.71-2.0 0.45-0.76 13 0.3924 0.0912 0.3012 0.40 1.23 0.3-4.7 � 4.50 0.71-2.0 0.45-0.76 14 0.3924 0.0912 0.3012 0.40 1.23 4.7-7.5 i 4.50 I 2.01-2.38 0.42-0.45 15 0.3924 0.0912 0.3012 0.40 1.23 4.7-7.5 I 4.50 i 2.01-2.38 0.42-0.45 18 0.3924 0.0912 0.3012 0.40 1.23 4.7-7.5 , 4.50 , 2.01-2.38 0.42-0.45 17 0.3924 0.0912 0.3012 0.40 1.23 4.7-7.5 1 4.50 , 2.01-2.38 0.42-0.45 I 18 0.3924 0.0912 0.3012 0.40 1.23 4.7-7.5 4.50 2.01-2.38 0.42-0.45 19 0.3924 j 0.0912 0.3012 0.40 1.23 4.7-7.5 1 4.50 12.01-2.38 0.42-0.45 20 0.3924 h 0.0912 0.3012 0.40 1.23 4.7-7.5 1 4.50 2.01-2.38 0.42-0.45 21 0.3924 0.0912 0.3012 0.40 1.23 4.7-7.5 4.50 j,2.01-2.38 0.42-0.45 22 0.3924 I 0.0912 0.3012 0.40 1.23 4.7-7.5 4.50 2.01-2.38 0.42-0.45 23 24 _-- - -__ _ 25 - 26 - - 27 I DRAINAGE AREAS r3 1 Is this a high density project? No 2 If so, number of drainage areas/SCMs 0 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 AS LOADED DRAINAGE AREA INFORMATION Entire Site LD 1 4 Type of SCM Grassed Swale Grassed Swale 5 Total drainage area(sq ft) 655,921 655921 6 Onsite drainage area(sq ft) 655921 655921 7 Offsite drainage area(sq ft) 0 0 8 Total BUA in project(sq ft) 152500 sf 152500 sf New BUA on subdivided lots(subject to permitting) 9 (sq ft) 132614 sf 132614 sf New BUA not on subdivided lots(subject to 10 !permitting)(sf) 19886 sf 19886 sf 11 ,Offsite BUA(sq ft) 12 Breakdown of new BUA not on subdivided lots: -Parking(sq ft) -Sidewalk(sq ft) -Roof(sq ft) -Roadway(sg ft) 19886 sf 19886 sf Future(sq ft) -Other,please specify in the comment box below(sq ft) 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) _ 16 Existing BUA that is already permitted(sq ft) 17 Existing BUA that will be removed(sq ft) 18 Percent BUA 23% 23% 19 Desi n storm inches) 1.0 in 1.0 in 20 Design volume of SCM(cu ft) 21 Calculation method for design volume ADDITIONAL INFORMATION (IPlease use this space to provide any additional information about the 22 !drainage area(s): the percent BUA in line 18 is 23.25%but the spreadsheet would not allow formating the decimal places.