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Home My WebLink AboutSW3210301_Supplement-EZ Form_20230406 SUPPLEMENT-EZ COVER PAGE LOAD SUPPLEMENT FORMS PROJECT INFORMATION 1 Project Name Cresswind-Phase 2 and 3 2 Project Area(ac) 107.1 3 Coastal Wetland Area(ac) 0 4 Surface Water Area(ac) 1.06 5 Is this project High or Low Density? High 6 1 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 2 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 1 Dry Pond 0 23 StormFilter 0 24 Silva Cell 0 25 Bayfilter 0 26 Filterra 0 LOAD SUPPLEMENT FORMS 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 �1Y1111111flIr ICI I H 11 1.a16 116. .........OC rN��•�. .�``'',,��1 CAR() , ` THOMAS AL & HUTTON _ Signature of Designer 0j+9480 ENGINEERING y co No. F-0871 iW't 4'r, OF 4 2 ,I Seal Date DRAINAGE AREAS 1 Is this a high density project? Yes F3versions? If so,number of drainage areas/SCMs 2 Is all/part of this project subject to previous rule No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site P ND 03 P ND 04 4 Type of SCM N/A Wet Pond Wet Pond 5 Total BUA in project(sq ft) 1845405 sf 1228238 sf 617167 sf New BUA on subdivided lots(subject to 6 permitting)(sq ft) 1150000 sf 802500 sf 347500 sf New BUA outside of subdivided lots(subject to 7 permitting)(sf) 695405 sf 425738 sf 269667 sf 8 Offsite-total area(sq ft) sf sf sf 9 Offsite BUA(sq ft) sf sf sf 10 Breakdown of new BUA outside subdivided lots: -Parking(sq ft) 273750 sf 186250 sf 87500 sf -Sidewalk(sq ft) 84889 sf 55631 sf 29258 sf -Roof(sq ft) sf sf sf -Roadway(sq ft) 280471 sf 183857 sf 96614 sf -Future(sq ft) 56295 sf N/A 56295 sf -Other,please specify in the comment box below(sq ft) sf sf sf New infiltrating permeable pavement on 11 subdivided lots(sq ft) sf sf sf New infiltrating permeable pavement outside of 12 subdivided lots(sq ft) sf sf sf Exisitng BUA that will remain(not subject to 13 permitting)(sq ft) sf sf sf 14 Existing BUA that is already permitted(sq ft) sf sf sf 15 Existing BUA that will be removed(sq ft) sf sf sf 16 Percent BUA 40% 62% 81% 17 Design storm(inches) N/A 1 in 1 in 18 Design volume of SCM(cu ft) N/A 105187 cf 49451 cf 19 Calculation method for design volume N/A 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 03 Pond 04 2 Design volume of SCM(cu ft) 100007 cf 49451 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 Does the SCM have retaining walls,gabion walls or other engineered 6 side slopes? No No Are the inlets,outlets,and receiving stream protected from erosion 7(10-year storm)? Yes Yes Is there an overflow or bypass for inflow volume in excess of the 8 design volume? Yes Yes DRAWDOWN 9 What is the method for dewatering the SCM for maintenance? ORIFICE PUMP 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)? No No 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 as OND MDC FROM 02H.1053 18 Method used SA/DA SA/DA 19 Has a stage/storage table been provided in the calculations? Yes Yes Elevation of the excavated main pool depth(bottom of sediment 20 removal)(fmsl) 559.00 562.50 21 Elevation of the main pool bottom-(top of sediment removal)(fmsl) 559.50 563.00 22 Elevation of the bottom of the vegetated shelf(fmsl) 564.50 566.50 23 Elevation of the permanent pool(fmsl) 565.00 567.00 24 Elevation of the top of the vegetated shelf(fmsl) 565.50 567.50 25 Elevation of the temporary pool(fmsl) 566.95 568.69 26 Surface area of the main permanent pool(square feet) 39712 20359 27 Volume of the main permanent pool(cubic feet) 177334 cf 68758 cf 28 Average depth of the main pool(feet) 4.78 ft 3.64 ft 29 Average depth equation used Equation 3 Equation 3 30 If using equation 3,main pool perimeter(feet) 1160.0 ft 666.0 ft 31 If using equation 3,width of submerged veg.shelf(feet) 3.0 ft 3.0 ft 32 Volume of the forebay(cubic feet) 28875 cf 11430 cf 33 Is this 15-20%of the volume in the main pool? Yes Yes 34 Clean-out depth for forebay(inches) 66 in 48 in 35 Design volume of SCM(cu ft) 100007 cf 49451 cf 36 Is the outlet an orifice or a weir? Orifice Orifice 37 If orifice,orifice diameter(inches) 4.in 3.in 38 If weir,weir height(inches) 39 If weir,weir length(inches) - - 40 Drawdown time for the temporary pool(days) 3 3 Are the inlet(i)and outlet located in a manner that avoids short- 41 circuiting? Yes Yes 42 Are berms or baffles provided to improve the flow path? No No 43 Depth of forebay at entrance(inches) 78 in 60 in 44 Depth of forebay at exit(inches) 72 in 54 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 Does the orifice drawdown from below the top surface of the 48 permanent pool? Yes Yes Does the pond minimize impacts to the receiving channel from the 1- 49 yr,24-hr storm? Yes Yes 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 Bermuda Bermuda 541 Has a planting plan been provided for the vegetated shelf? Yes Yes ADDITIONAL INFORMATION Please use this space to provide any additional information about the 55 wet pond(s):