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Home My WebLink AboutSW3220803_Supplement-EZ Form_20240813 SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 Project Name Cresswind-Phase 4 2 Project Area(ac) 49.19 3 Coastal Wetland Area(ac) 0 4 Surface Water Area(ac) 1.6 5 Is this project High or Low Density? High 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 Is BUA other that as listed in.1003(4)(c-d)out of the setback? Yes 10 Is streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCMs: 11 Infiltration System 0 12 Bioretention Cell 0 13 Wet Pond 1 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 26 Filterra 0 FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: Matthew S.Kiker 28 Organization: Thomas&Hutton 29 Street address: 1020 Euclid Avenue 30 City,State,Zip: Charlotte,NC 28203 31 Phone number(s): 980-201-5507 32 Email: kiker.m@tandh.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 ON� C N11C ARo/ /i ,/,'"egr‘ f Signature of Designer SEAL — 049480 • 8-12-2024 t.0 s `,��` 8-12-2024 '�11111,IIl It1111�,`` Date DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so,number of drainage areas/SCMs 1 Is all/part of this project subject to previous rule 3 versions? No CLICK TO LOAD FORM DRAINAGE AREA INFORMATION ENTIRE SITE POND 05 4 Type of SCM N/A WET POND 5 Total BUA in project(sq ft) 1190040 sf 1190040 sf New BUA on subdivided lots(subject to 6 permitting)(sq ft) 745000 sf 745000 sf New BUA outside of subdivided lots(subject to 7 permitting)(sf) 445040 sf 445040 sf 8 Offsite-total area(sq ft) sf sf 9 Offsite BUA(sq ft) sf sf 10 Breakdown of new BUA outside subdivided lots: -Parking(sq ft) 186250 sf 186250 sf -Sidewalk(sq ft) 62291 sf 62291 sf -Roof(sq ft) -Roadway(sq ft) 196499 sf 196499 sf -Future(sq ft) -Other,please specify in the comment box below(sq ft) sf sf New infiltrating permeable pavement on 11 subdivided lots(sq ft) sf sf New infiltrating permeable pavement outside of 12 subdivided lots(sq ft) sf sf Exisitng BUA that will remain(not subject to 13 permitting)(sq ft) sf sf 14 Existing BUA that is already permitted(sq ft) sf sf 15 Existing BUA that will be removed(sq ft) sf sf 16 Percent BUA 55% 64% 17 Design storm(inches) 1 in. 1 in. 18 Design volume of SCM(cu ft) 95975 cf 95975 cf 19 Calculation method for design volume Simple Simple ADDITIONAL INFORMATION Please use this space to provide any additional information about the 20 drainage area(s): WET POND 1 Drainage area number Pond 05 2 Design volume of SCM(cu ft) 95975 cf GENERAL MDC FROM 02H.1050 3 Is the SCM sized to treat the SW from all surfaces at build-out? Yes 4 Is the SCM located away from contaminated soils? Yes 5 What are the side slopes of the SCM(H:V)? 3:1 Does the SCM have retaining walls,gabion walls or other 6 engineered side slopes? No Are the inlets,outlets,and receiving stream protected from erosion 7(10-year storm)? Yes Is there an overflow or bypass for inflow volume in excess of the 8 design volume? Yes DRAWDOWN 9 What is the method for dewatering the SCM for maintenance? ORIFICE 10 If applicable,will the SCM be cleaned out after construction? Yes 11 Does the maintenance access comply with General MDC(8)? Yes 12 Does the drainage easement comply with General MDC(9)? Yes If the SCM is on a single family lot,does(will?)the plat comply with 13 General MDC(10)? No 14 Is there an O&M Agreement that complies with General MDC(11)? Yes 15 Is there an O&M Plan that complies with General MDC(12)? Yes 16 Does the SCM follow the device specific MDC? Yes 17 Was the SCM designed by an NC licensed professional? Yes WET POND MDC FROM 02H.1053 18 Method used SA/DA 19 Has a stage/storage table been provided in the calculations? Yes Elevation of the excavated main pool depth(bottom of sediment 20 removal)(fmsl) 569.50 21 Elevation of the main pool bottom-(top of sediment removal)(fmsl) I 570.00 22 Elevation of the bottom of the vegetated shelf(fmsl) 574.00 23 Elevation of the permanent pool(fmsl) 574.50 24 Elevation of the top of the vegetated shelf(fmsl) 575.00 25 Elevation of the temporary pool(fmsl) 576.40 26 Surface area of the main permanent pool(square feet) 37629 27 Volume of the main permanent pool(cubic feet) 136114 cf 28 Average depth of the main pool(feet) 3.95 ft 29 Average depth equation used Equation 3 30 If using equation 3,main pool perimeter(feet) 1141.0 ft 31 If using equation 3,width of submerged veg.shelf(feet) 3.0 ft 32 Volume of the forebay(cubic feet) 26058 cf 33 Is this 15-20%of the volume in the main pool? Yes 34 Clean-out depth for forebay(inches) 54 in 35 Design volume of SCM(cu ft) 98098 cf 36 Is the outlet an orifice or a weir? Orifice 37 If orifice,orifice diameter(inches) 4.in 38 If weir,weir height(inches) - 39 If weir,weir length(inches) - 40 Drawdown time for the temporary pool(days) 3 Are the inlet(s)and outlet located in a manner that avoids short- 41 circuiting? Yes 42 Are berms or baffles provided to improve the flow path? No 43 Depth of forebay at entrance(inches) 66 in 44 Depth of forebay at exit(inches) 60 in 45 Does water flow out of the forebay in a non-erosive manner'? Yes 46 Width of the vegetated shelf(feet) 6 ft 47 Slope of vegetated shelf(H:V) 6:1 Does the orifice drawdown from below the top surface of the 48 permanent pool? Yes Does the pond minimize impacts to the receiving channel from the 1 49 yr,24-hr storm? Yes Are fountains proposed?(If Y,please provide documentation that 50 MDC(9)is met.) No 51 Is a trash rack or other device provided to protect the outlet system? Yes 52 Are the dam and embankment planted in non-clumping turf grass? Yes 53 Species of turf that will be used on the dam and embankment Bermuda 54 Has a planting plan been provided for the vegetated shelf? Yes ADDITIONAL INFORMATION Please use this space to provide any additional information about 55 the wet pond(s):