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Home My WebLink AboutSW3200101_Supplement-EZ Form_20220216SUPPLEMENT-EZ COVER PAGE =ORMS LOADED PROJECT INFORMATION 1 1 Project Name Project Area ac Cresswind - Phase 1 2 79.6 3 Coastal Wetland Area ac 0 0.4 4 Surface Water Area ac 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 .1 0034 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 ISand Filter 0 17 Rainwater Harvesting RWH 0 18 Green Roof 0 19 Level Spreader -Filter Stri 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 Ba filter 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 numbers : 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. glll'''' Q�aFESS/o�q< E lS 04a480 '''��9 %' • F/VG IN FER •'��`��` T H 0 M A S & HUTTON ENGINEERING CO F .• No. F-0811 0 '''11 llllllllll10O```` Z 4 P. - - - 4- 14,01 gnature of Designer In,q-Al Date DRAINAGE AREAS 1 Is this a high densityproject? Yes 2 If so, number of drainage areas/SCMs 2 3 Is all/part of this project subject to previous rule versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 2 4 Type of SCM N/A Wet Pond Wet Pond 5 Total BUA in project (sq ft 1603569 sf 177474 sf 1426095 sf 6 New BUA on subdivided lots (subject to permitting) (sq ft 685000 sf 135000 sf 550000 sf 7permitting) New BUA outside of subdivided lots (subject to s 473355 sf 42474 sf 430881 sf 8 Offsite -total area (sq ft sf sf 445214 sf 9 Offsite BUA (sq ft sf sf 445214 sf 10 Breakdown of new BUA outside subdivided lots: - Parking (sq ft sf sf sf -Sidewalk (sft 66500 sf 10118 sf 56382 sf - Roof (sq ft sf sf sf - Roadway s ft 217469 sf 32356 sf 185113 sf - Future (sq ft 189386 sf sf 189386 sf - Other, please specify in the comment box below (sq ft sf sf sf 11 New infiltrating permeable pavement on subdivided lots (sq ft sf sf sf 12 New infiltrating permeable pavement outside of Isubdivided lots (sq ft sf sf sf 13permitting) Exisitng BUA that will remain (not subject to s 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 31 % 38% 57% 17 Design storm inches 1 in 1 in 18 1 Design volume of SCM cu ft 15237 cf 117369 cf 19 1 Calculation method for design volume Simple Simple ADDITIONAL INFORMATION 20 Please use this space to provide any additional information about the drainage area(s): The future area draining to Pond #2 is intended to account for a future amenity center. The offsite drainage in the post development condition is assumed to be 100% impervious to address the instance of future development effecting the capacity of the Pond #2. WET POND H1 Drainage area number 1 2 2 Design volume of SCM (cu ft) 15237 cf 117369 cf GENERAL MDC FROM 02H .1050 3 Is the SCM sized to treat the SW from all surfaces at build -out? Fes y__s 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 engineered side slopes? No No 7 Are the inlets, outlets, and receiving stream protected from erosion (10-year storm)? Yes Yes 8 Is there an overflow or bypass for inflow volume in excess of the design volume? Yes Yes 9 What is the method for dewatering the SCM for maintenance? Drawdown Orifice Drawdown Orifice 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 13 If the SCM is on a single family lot, does (will?) the plat comply with General MDC (10)? No No 141 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 161 Does the SCM follow the device specific MDC? Yes Yes 17 Was the SCM designed by an NC licensed professional? WET POND MDC FROM 02H .1053 r 181 Method used Yes SA/DA Yes 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 removal) (fmsl) 570.50 581.50 21 Elevation of the main pool bottom -(top of sediment removal) (fmsl) 571.00 582.00 22 Elevation of the bottom of the vegetated shelf (fmsl) 574.50 585.50 231 Elevation of the permanent pool (fmsl) 575.00 586.00 24 Elevation of the top of the vegetated shelf (fmsl) 575.50 586.50 25 Elevation of the temporary pool (fmsl) 575.61 587.81 26 Surface area of the main permanent pool (square feet) 17608 49082 27 Volume of the main permanent pool (cubic feet) 60068 cf 175476 cf 28 Average depth of the main pool (feet) 3.64 ft 3.58 ft 29 Average depth equation used Equation 3 Equation 2 301 If using equation 3, main pool perimeter (feet) 550.0 It 31 If using equation 3, width of submerged veg. shelf (feet) 3.0 It - 32 Volume of the forebay (cubic feet) 9721 cf 29611 cf 33 Is this 15-20% of the volume in the main pool? Yes Yes 34 Clean -out depth for forebay (inches) 48 in 48 in 35 Design volume of SCM (cu ft) 15237 cf 117369 cf 36 Is the outlet an orifice or a weir? Orifice Orifice 371 If orifice, orifice diameter (inches) 2. in 4. in 38 If weir, weir height (inches) 39 If weir, weir length (inches) - - 40 Drawdown time for the temporary pool (days) 3 3 41 Are the inlet(s) and outlet located in a manner that avoids short- circuiting? Yes Yes 42 Are berms or baffles provided to improve the flow path? No No 431 Depth of forebay at entrance (inches) 60 in 60 in 441 Depth of forebay at exit (inches) 54 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 It 6 It 47 Slope of vegetated shelf (H:V) 6:1 6:1 48 Does the orifice drawdown from below the top surface of the permanent pool? Yes Yes 491 Does the pond minimize impacts to the receiving channel from the 1- yr, 24-hr storm? Yes Yes 50 Are fountains proposed? (If Y, please provide documentation that MDC(9) is met.) No Is a trash rack or other device provided to protect the outlet system? Yes No 51 Yes 52 Are the dam and embankment planted in non -clumping turf grass? Yes Yes 531 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 1 ADDITIONAL INFORMATION 55 Please use this space to provide any additional information about the wet pond(s): 6:11 AM 12/9/2021