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Home My WebLink AboutSW5221102_Supplement-EZ Form_20230712 LEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 Project Name - -- Bryson's Ridge Subdivision-Phase 2 2 Project Area(ac) 52.10(Phase 2 Only) 3 Coastal Wetland Area(ac) _ 0 4 Surface Water Area(ac) 0 5 Is this project High or Low Density? Both High and Low Density 6 Does this project use an off-site SCM? No COIN:LJ E W1THIaliiA03(41 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 Bioretentlon Cell 13 Wet Pond 2 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: J.Michael Stocks,P.E.CEO 28 Organization: Stocks Engineering 29 Street address: 801 E Washin ton St. 30 City,State,Zip: Nashville,NC 27856 31 Phone number(s): 252-459-8196 32 Email: mstocks@stocksengineering.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 • 9 • Signature of Designer a¢ SEAL r • 19843 ..... qh/2-Z-' �.r�yA g(,`�`. Date DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so,number of drainage areas/SCMs 2 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 1 2 LD 7 4 Type of SCM Wet Pond Wet Pond None 5 Total drainage area(sq ft) 2,319,778 1187485 260489 871804 6 Onsite drainage area(sq ft) 2,269,515 1187485 210226 871804 7 Offsite drainage area(sq ft) 50263 sf 50263 0 8 Total BUA in project(sq ft) 782338 sf 474804 sf 111514 sf 196020 sf New BUA on subdivided lots(subject to permitting) 9 (sq ft) 462000 sf 250250 sf 35000 sf 176750 sf New BUA not on subdivided lots(subject to 10 permitting)(sf) 224554 sf 26251 sf 19270 sf 11 Offsite BUA(sq ft) 50263 sf sf 50263 sf sf 12 Breakdown of new BUA not on subdivided lots: -Parking(sq ft) sf sf sf sf -Sidewalk(sq ft) 74533 sf 62277 sf 7286 sf 4970 sf -Roof(sq ft) sf sf sf sf -Roadway(sq ft) 195542 sf 162277 sf 18965 sf 14300 sf -Future(sq ft) sf sf sf 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 32% 40% 43% 22% 19 Design storm(inches) 1.0 in 1.0 in 20 Design volume of SCM(cu ft) 40558 cf 9449 cf 21 Calculation method for design volume Simple Simple ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): WET POND 1 Drainage area number 1 I 2 I 2 Minimum required treatment volume(Cu ft) 40558 cf 9449 cf GENERAL MDC FROM 02H.1050 3 Is the SCM sized to treat the SW from all surfaces at build-out? Yes Yes 4 Is the SCM located away from contaminated soils? Yes Yes 5 What are the side slopes of the SCM(H:V)? 3:1 3:1 6 Does the SCM have retaining walls,gabion walls or other No No engineered side slopes? 7 Are the inlets,outlets,and receiving stream protected from erosion Yes Yes (10-year storm)? 8 Is there an overflow or bypass for inflow volume in excess of the Yes Yes design volume? 9 What is the method for dewatering the SCM for maintenance? Pump(preferred) Pump(preferred) 10 If applicable,will the SCM be cleaned out after construction? Yes Yes 11 Does the maintenance access comply with General MDC(8)? Yes Yes 12 Does the drainage easement comply with General MDC(9)? Yes Yes If the SCM is on a single family lot,does(will?)the plat comply with 13 General MDC(10)? N/A N/A 14 Is there an O&M Agreement that complies with General MDC(11)? Yes Yes 15 Is there an O&M Plan that complies with General MDC(12)? Yes Yes 16 Does the SCM follow the device specific MDC? Yes Yes 17 Was the SCM designed by an NC licensed professional? Yes Yes WET POND MDC FROM 02H.1053 3 18 Sizing method used SA/DA _ SA/DA 19 Has a stage/storage table been provided in the calculations? Yes Yes 20 Elevation of the excavated main pool depth(bottom of sediment 236.00 245.00 removal)(fmsl) 21 Elevation of the main pool bottom(top of sediment removal)(fmsl) 237.00 246.00 22 Elevation of the bottom of the vegetated shelf(fmsl) 243.00 253.00 23 Elevation of the permanent pool(fmsl) 243.50 253.50 24 Elevation of the top of the vegetated shelf(fmsl) 244.00 254.00 25 Elevation of the temporary pool(fmsl) 245.50 255.50 26 Surface area of the main permanent pool(square feet) 20568 5621 27 Volume of the main permanent pool(cubic feet) 87533 cf 24589 cf 28 Average depth of the main pool(feet) 4.30 ft 4.40 ft 29 Average depth equation used Equation 2 Equation 2 30 If using equation 3,main pool perimeter(feet) 31 If using equation 3,width of submerged veg.shelf(feet) 32 Volume of the forebay(cubic feet) 16552 cf 4796 cf 33 Is this 15-20%of the volume in the main pool? Yes Yes 34 Clean-out depth for forebay(inches) 54 in 36 in 35 Design volume of SCM(cu ft) 61872 cf 18953 cf 36 Is the outlet an orifice or a weir? Orifice Orifice 37 If orifice,orifice diameter(inches) 3 in 2 in 38 If weir,weir height(inches) 39 If weir,weir length(inches) 40 Drawdown time for the temporary pool(days) 3.2 4.5 41 Are the inlet(s)and outlet located in a manner that avoids short- Yes Yes circuiting? 42 Are berms or baffles provided to improve the flow path? No No 43 Depth of forebay at entrance(inches) 66 in 54 in 44 Depth of forebay at exit(inches) 42 in 24 in 45 Does water flow out of the forebay in a non-erosive manner? Yes Yes 46 Width of the vegetated shelf(feet) 6 ft _ 6 ft 47 Slope of vegetated shelf(H:V) 6:1 6:1 48 Does the orifice drawdown from below the top surface of the Yes Yes permanent pool? 49 Does the pond minimize impacts to the receiving channel from the 1- Yes Yes yr,24-hr storm? Are fountains proposed?(If Y,please provide documentation that 50 MDC(9)is met.) No No 51 Is a trash rack or other device provided to protect the outlet system? Yes Yes 52 Are the dam and embankment planted in non-clumping turf grass? Yes Yes 53 Species of turf that will be used on the dam and embankment Centipede Centipede 54 Has a planting plan been provided for the vegetated shelf? Yes Yes ADDITIONAL INFORMATION Please use this space to provide any additional information about 55 the wet pond(s): Orifice Diameter is 3.25"for drainage area 1 pond and 1.5"for drainage area 2 pond. Wet Pond 3 2:31 PM 7/11/2023 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) 3:01 5 Maximum velocity in the vegetated conveyances during the 10-year storm? 2.59 6 Are curb outlet swales proposed? Yes 7 Maximum longitudinal slope of curb outlet swale(s)(%) 2% 8 Bottom width of curb outlet swale(s)(feet) 2 ft 9 Maximum side slope of curb outlet swale(s)(H:V) 3:1 10 Minimum length of curb outlet swale(s)(feet) 110 ft 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 15 Please use this space to provide any additional information about this low density project: The Remaining swale results are in the Swale Calculations package.There are 47 in total.S-47 is the Curb Outlet.The swales side slopes range from 15:1 to 3:1. Drainage Pervious Swale Area BUA area C Q Slope Vanow Vacua! Flow depth # (ac) (ac) (ac) (cfs) (%) (fps) (fps) (ft) 1 0.21 0.07 0.14 0.58 0.81 0.02 4.50 1.12 0.22 2 0.31 0.07 0.24 0.52 1.08 0.02 4.50 1.69 0.40 3 0.24 0.07 0.17 0.56 0.89 0.05 4.50 2.47 0.30 4 0.21 0.07 0.14 0.58 0.81 0.02 4.50 1.12 0.22 5 0.21 0.07 0.14 0.58 0.81 0.02 4.50 1.12 0.22 6 0.19 0.07 0.12 0.60 0.76 0.05 4.50 1.90 0.20 7 0.31 0.07 0.21 0.49 1.19 0.02 4.50 1.53 0.36 8 0.15 0.07 0.08 0.66 0.65 0.02 4.50 1.08 0.20 9 0.15 0.07 0.08 0.66 0.65 0.03 4.50 1.47 0.21 10 0.16 0.07 0.09 0.64 0.68 0.02 4.50 1.03 0.21 11 0.15 0.07 0.08 0.66 0.65 0.02 4.50 1.22 0.19 12 0.15 0.07 0.08 0.66 0.65 0.04 4.50 1.52 0.17 13 0.15 0.07 0.08 0.66 0.65 0.05 4.50 1.69 0.16 14 0.15 0.07 0.08 0.66 0.65 0.02 4.50 1.13 0.24 15 0.16 0.07 0.09 0.64 0.68 0.02 4.50 1.18 0.24 16 0.17 0.07 0.10 0.63 0.71 0.02 4.50 1.23 0.24 17 0.15 0.07 0.08 0.66 0.65 0.02 4.50 1.13 0.24 18 0.15 0.07 0.08 0.66 0.65 0.02 4.50 1.13 0.24 19 0.13 0.07 0.06 0.70 0.60 0.02 4.50 1.13 0.23 20 0.10 0.07 0.03 0.79 0.52 0.02 4.50 0.96 0.19 21 0.09 0.07 0.02 0.83 0.49 0.02 4.50 1.01 0.18 22 0.10 0.07 0.03 0.79 0.52 0.03 4.50 1.35 0.16 23 0.11 0.07 0.04 0.75 0.55 0.05 4.50 1.63 0.15 24 0.17 0.07 0.10 0.63 0.71 0.02 4.50 1.07 0.21 25 0.15 0.07 0.08 0.66 0.65 0.02 4.50 1.08 0.20 26 0.12 0.07 0.05 0.72 0.57 0.05 4.50 1.76 0.18 27 0.12 0.07 0.05 0.72 0.57 0.02 4.50 0.66 0.24 28 0.13 0.07 0.06 0.70 0.60 0.02 4.50 1.00 0.20 29 0.16 0.07 0.09 0.64 0.68 0.02 4.50 1.07 0.20 30 0.22 0.07 0.15 0.58 0.84 0.02 4.50 1.16 0.84