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Home My WebLink AboutSW3220306_Supplement-EZ Form_20230612 SUPPLEMENT-EZ COVER PAGE FORMSLOAOED PROJECT INFORMATION 1 Project Name Preserve at Forest Creek Phase 1 2 Project Area ac 101.65 3 Coastal Welland Area ac 0 4 Surface Water Area ac 3.85 5 Is this pr9ject High or Low Density? High g 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 If BUA is proposed in the setback does it meet NCAC 02H.1003 4 c-d T No 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 6 14 Stormwater Welland 0 15 Permeable Pavement 0 16 Sand Filter 0 17 Rainwater Harvesting RWH 0 18 Green Roof 0 19 Level Spreader-Filter Strip(IS-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: Frank McMahan PE 28 Organization: LandDesi n 29 Street address: 223 North Graham Street 30 City,State Zip: Charlotte NC 28202 31 Phone numbers: 704 333-0325 32 Email: fmcmahan@landdesign.com Certification Mptement- 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. Deslaner kA SEAL Signature of r 037773 FNG - Nk• �Q' ` J. M N 6 7 �oz3 Seal Date DRAINAGE AREAS 1 Is this a hi h density project? Yes 2 If so,number of drainage areas/SCMs 6 3 Does this project have low density areas? No 4 If so,number of low density drainage areas 0 Is all/part of this project subject to previous rule 5 versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 2 3 4 5 6 4 Type of SCM WETPOND WETPOND WETPOND WETPOND WETPOND WETPOND 5 Total drainage area(sq ft 3088929 sf 491598 sf 102729 sf 1118122 sf 589739 sf 424918 sf 361823 sf 6 Onsite drainage area(sq ft 2784868 sf 491598 sf 76346 sf 978294 sf 584105 sf 388631 sf 265894 sf 7 Offsite drainage area(sq ft 304061 sf N/A 26383 sf 139828 sf 5634 sf 36287 sf 95929 sf 8 Total BUA in project(sq ft 2023507 sf 289769 sf 65377 sf 722123 sf 400370 sf 292441 sf 253427 sf New BUA on subdivided lots(subject to 9permitting) s ft 1319061 sf 229081 sf 35011 sf 430861 sf 296993 sf 208357 sf 118758 sf New BUA not on subdivided lots(subject to 10permitting) sf 400385 sf 60688 sf 3983 sf 151434 sf 97743 sf 47797 sf 38740 sf 11 Offsite BUA(sq ft 304061 sf N/A 26383 sf 139828 sf 5634 sf 36287 sf 95929 sf 12 Breakdown of new BUA not on subdivided lots: Parking(sq ft N/A N/A N/A N/A N/A N/A N/A Sidewalk(sq ft 99792 sf 15293 sf 969 sf 37445 sf 24461 sf 11993 sf 9631 sf Roof(sq ft N/A N/A N/A N/A N/A N/A N/A Roadway s ft 273325 sf 39716 sf 2422 sf 105342 sf 67032 sf 31756 sf 27057 sf Future(sq ft N/A N/A N/A N/A N/A N/A N/A Other,please specify in the comment box below(so ft 27268 sf 5679 sf 592 sf 8647 sf 6250 sf 4048 sf 2052 sf New infiltrating permeable pavement on 13 Isubdivided lots(sq ft N/A N/A N/A N/A N/A N/A N/A New infiltrating permeable pavement not on 14 subdivided lots(sq ft N/A N/A N/A N/A N/A N/A N/A Existing BUA that will remain(not subject to 15permitting) s ft N/A N/A N/A N/A N/A N/A N/A 16 Existing BUA that is already permitted(sq ft N/A N/A N/A N/A N/A N/A N/A 17 Existing BUA that will be removed(sq ft 0 18 1 Percent BUA 66% 59% 64% 65% 68% 69% 70% 19 Design storm inches 1.0 in 1.0 in 1.0 in 1.0 in 1.0 in 1.0 in 20 Desi n volume of SCM cu ft 25818 cf 8785 cf 63113 cf 32793 cf 24913 cf 21075 cf 21 Calculation method for design volume POND PACK POND PACK POND PACK POND PACK POND PACK POND PACK ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): Other BUA includes driveway area.Offsite BUA has been calculated using full build out potential(assumed 100%BUA).Subdivided lot BUA has been calculated using 70%BUA on all lots. WET POND 1 Drainage area number 1 2 3 4 5 6 2 Minimum required treatment volume cu ft) 23775 cf 5329 cf 58826 cf 32481 cf 23691 cf 20522 cf GENERAL MDC FROM 02H.3050 3 Is the SCM sized to treat the SW from all surfaces at build-out? Yes Yes Yes Yes Yes Yes 4 Is the SCM located away from contaminated soils? Yes Yes Yes Yes Yes Yes 5 What are the side slopes of the SCM H:V? 3:1 3:1 3:1 3:1 3:1 3:1 6 Does the SCM have retaining walls,gabion walls or other Yes No No No Yes No engineered side slopes? 7 Are the inlets,outlets,and receiving stream protected from erosion Yes Yes Yes Yes Yes Yes 10-ear storm? 81 Is there an overflow or bypass for inflow volume in excess of the Yes Yes Yes Yes Yes Yes desi n volume? 9 What is the method for dewatering the SCM for maintenance? Pump preferred Pump preferred Pump preferred Pump preferred Pump preferred Pump preferred 10 Ifapplicable,will the SCM be cleaned out after construction? Yes Yes Yes Yes Yes Yes 11 Does the maintenance access comply with General MDC 8? Yes Yes Yes Yes Yes Yes 12 Does the drainage easement comply with General MDC 9? Yes Yes Yes Yes Yes Yes 13 If the SCM is on a single family lot,does(will?)the plat comply with N/A N/A N/A N/A N/A N/A General MDC 10? 14 Is there an O&M Agreement that complies with General MDC(11)? Yes Yes Yes Yes Yes Yes 15 Is there an O&M Plan that complies with General MDC 12? Yes Yes Yes Yes Yes Yes 16 Does the SCM follow the device specific MDC? Yes Yes Yes Yes Yes Yes 17 Was the SCM desi ned b an NC licensed professional? Yes Yes Yes Yes Yes Yes WET POND MDC FROM 02H.1053 18 Sizing method used SAIDA SAIDA SAIDA SAIDA SAIDA SAIDA 19 Has a sta a/stora a table been provided in the calculations? Yes Yes Yes Yes Yes Yes 20 Elevation of the excavated main pool depth(bottom of sediment 565.50 576.50 569.50 580.50 598.50 606.50 removal)(fmsl 21 Elevation of the main pool bottom(top of sediment removal)(fmsl) 566.00 577.00 570.00 581.00 599.00 607.00 22 Elevation of the bottom of the vegetated shelf fmsl 571.50 581.50 573.50 584.50 603.50 611.50 23 Elevation of the permanent pool fmsl 572.00 582.00 574.00 585.00 604.00 612.00 241 Elevation of the top of the vegetated shelf fmsl 572.50 582.50 574.50 585.50 604.50 612.50 25 Elevation of the temporary pool fmsl 573.50 583.00 575.75 586.50 605.25 613.50 26 Surface area of the main permanent pool square feet 11828 sf 6266 sf 27514 sf 15809 sf 14315 sf 9921 sf 27 Volume of the main permanent pool cubic feet 45122 cf 20418 cf 93977 cf 48343 cf 55343 cf 35783 cf 28 Average depth of the main pool feet 3.81 ft 3.26 ft 3.42 ft 3.06 ft 3.87 ft 3.6 ft 29 Average depth e uation used Equation 2 Equation 2 Equation 2 Equation 2 Equation 2 Equation 2 30 If using equation 3,main pool perimeter feet N/A N/A N/A N/A N/A N/A 31 If using equation 3,width of submerged veg.shelf feet N/A N/A N/A N/A N/A N/A 32 Volume of the foreba cubic feet 7859 cf 3999 cf 15564 cf 9136 cf 10966 cf 6121 cf 33 Is this 15-20%of the volume in the mainpool? Yes Yes Yes Yes Yes Yes 34 Clean-out depth for foreba inches 72 in 60 in 48 in 48 in 60 in 60 in 35 Design volume of SCM cu ft 25818 cf 8785 cf 63113 cf 32793 cf 24913 cf 21075 cf 36 Is the outlet an orifice or a weir? Orifice Orifice Orifice Orifice Orifice Orifice 37 If orifice,orifice diameter inches 2.5 in 1.5 in 3.5 in 3.0 in 2.5 in 2.0 in 38 If weir,weir height inches N/A N/A N/A N/A N/A N/A 39 If weir,weir length(inches) N/A N/A N/A N/A N/A N/A 40 Drawdown time for the tempos pool(days) 2.76 3.29 3.24 2.45 2.95 3.6 41 Are the inlet(s)and outlet located in a manner that avoids short- Yes Yes Yes Yes Yes Yes circuiting? 42 Are berms or baffles provided to improve the flow path? No No No No No No 43 Depth of forebay at entrance inches 82 in 70 in 58 in 58 in 70 in 70 in 44 Depth of forebay at exit inches 78 in 66 in 54 in 54 in 66 in 66 in 45 Does water flow out of the forebay in a non-erosive manner? Yes Yes Yes Yes Yes Yes 46 Width of the vegetated shelf feet 6 ft 6 ft 6 ft 6 ft 6 ft 6 ft 47 Slope of vegetated shelf H:V 6:1 6:1 6:1 6:1 6:1 6:1 46 Does the orifice drawdown from below the top surface of the Yes Yes Yes Yes Yes Yes ermanent ool? 49 Does the pond minimize impacts to the receiving channel from the Yes Yes Yes Yes Yes Yes 1- r 24-hr storm? 50 Are fountains proposed?(If Y,please provide documentation that No No No No No No MDC 9 is met. 51 Is a trash rack or other device provided to protect the outlet Yes Yes Yes Yes Yes Yes system? 52 Are the dam and embankment planted in non-clumping turf grass? Yes Yes Yes Yes Yes Yes 53 Species of turf that will be used on the dam and embankment HYBRID HYBRID HYBRID HYBRID HYBRID HYBRID BERMUDA BERMUDA BERMUDA BERMUDA BERMUDA BERMUDA 54 Hasa planting plan been provided for the vegetated shelf? Yes Yes Yes Yes Yes Yes ADDITIONAL INFORMATION Please use this space to provide any additional information about 55 the wet pond(s):