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Home My WebLink AboutSW3210301_Supplement-EZ Form_20211118SUPPLEMENT-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 .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 Sand Filter 0 17 Rainwater Harvesting RWH 0 18 Green Roof 0 19 Level Spreader -Filter StLS-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 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, INC 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. CAR 4� e � aFEssioti•. 9 SALT - 049480 ' E�/G1NEE� •'• � 00 THOMAS a HUTTON ENGINEERING - CO �:•. N. F-0871 r:o OF 1/1111111111 Signature of Designer 11- vl-c�-1 Date WET POND 1 Drainage area number Pond 03 Pond 04 21 Design volume of SCM (cu ft) 105187 cf 46929 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 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 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 13 If the SCM is on a single family lot, does (will?) the plat comply with 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 INC licensed professional? OND MDC FROM 02H .1053 _ 18 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) 558.50 562.00 21 Elevation of the main pool bottom -(top of sediment removal) (fmsl) 559.00 562.50 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) 566.73 568.43 26 Surface area of the main permanent pool (square feet) 39712 19948 27 Volume of the main permanent pool (cubic feet) 190249 cf 74522 cf 28 Average depth of the main pool (feet) 5.13 ft 4.03 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) 30373 cf 13816 cf 33 Is this 15-20 % of the volume in the main pool? Yes Yes 34 Clean -out depth for forebay (inches) 72 in 54 in 35 Design volume of SCM (cu ft) 105187 cf 46929 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 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 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 48 Does the orifice drawdown from below the top surface of the permanent pool? Yes Yes 49 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 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 turfthat will be used on the dam and embankment Bermuda Bermuda b4l Has a planting plan been provided for the vegetated shelf? Yes Yes ADDITIONAL INFORMATION 55 Please use this space to provide any additional information about the wet pond(s): DRAINAGE AREAS 1 Is this a high density project? 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 4 Type of SCM N/A Wet Pond Wet Pond 5 Total BUA in project (sq ft) 1875167 sf 1292694 sf 582474 sf 6 New BUA on subdivided lots (subject to permitting) (sq ft) 1160000 sf 845000 sf 315000 sf 7 New BUA outside of subdivided lots (subject to permitting) (sf) 715167 sf 447693 sf 267474 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) 290000 sf 200000 sf 90000 sf Sidewalk (sq ft) 84156 sf 57079 sf 27077 sf Roof (sq ft) sf sf sf Roadway (sq ft) 284716 sf 190614 sf 94102 sf Future (sq ft) 56295 sf N/A 56295 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 subdivided lots (sq ft) sf sf sf 13 Exisitng BUA that will remain (not subject to 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% 65% 75% 17 Design storm (inches) N/A 1 in 1 in 18 Design volume of SCM (cu ft) N/A 105187 cf 46929 cf 19 Calculation method for design volume N/A Simple Simple ADDITIONAL INFORMATION 20 Please use this space to provide any additional information about the drainage area(s):