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Home My WebLink AboutSW6221201_Supplement-EZ Form_20230404SUPPLEMENT-EZ COVER PAGE FORMS LOADED 71 PROJECT INFORMATION 1 Project Name Ample Storage 2 1 Project Area ac 6.18 3 Coastal Wetland Area ac _ 4 Surface Water Area ac 0 5 Is this project High or Low Density? High 6 Does this project use an off -site SCM? No 02H . the Is streambank stabilization UMBER AND TYPEW SCMs: 11 lnfiltration System 12 Bioretention Cell 13 Wet Pond es it meet NCAC 02H.1 C on this project? 15 Permeable Pavement 16 Sand Filter 17 l Rainwater Harvesting (RWH) 18 Green Roof 19 Level S reader -Filter Strip (LS-FS) 20 Disconnected Impervious Surface (DIS) 21 Treatment Swale 22 Dry Pond 23 StormFilter 24 Silva Cell 25 Ba !ter 26 Filterra — FORMS LOADED 20 Yes N/A No DESIGNER CERTIFICATION 27 Name and Title: John F. Oglesby, PE - Sr. Project Manager 28 ,Organization: CSD Engineering 29 Street address: 115 E. Third Street 30 City, State, Zip: Wendell, NC 27591 31 'Phone number(s): (919) 624-0997 32 !Email: john@csd-engineering.com 0 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 _ CL SEA!_ �. 032721 � � q. Signa r of Designer 3 2— Date DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so, number of drainage areas/SCMs 1 3 Does this oroiect have low densit areas? No 4 If so number of low 4ify drainage areas 0 5 Is all/part of this project subject to previous rule versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 4 Type of SCM Wet Pond 5 Total drainage area (sq ft 269,201 202,525 6 Onsite drainage area (sq ft 269,201 202,525 7 Offsite drainage area (sq ft 0 0 8 Total BUA in project (sq ft 170952 sf 170952 sf 9 New BUA on subdivided lots (subject to ermitting) (sq ft n/a n/a 10 New BUA not on subdivided lots (subject to permitting) (sf) 170952 sf 170952 sf 11 Offsite BUA (sq ft 12 Breakdown of new BUA not on subdivided lots: - Parking (sq ft 65074 sf 65074 sf - Sidewalk (sq ft 925 sf 925 sf - Roof (sq ft 104953 sf 104953 sf - Roadway s ft - Future (sq ft - Other, please specify in the comment box below (sq ft 13 New infiltrating permeable pavement on subdivided lots (sq ft 14 New infiltrating permeable pavement not on subdivided lots (sq ft 15 Existing BUA that will remain (not subject to ermitting) (sq ft 16 lExistina BUA that is already ermitted (sq ft 17 Existing BUA that will be removed (sq ft 13016 sf 13016 sf 18 Percent BUA 64% 84 0 19 IDesign storm inches 1.0 in 20 IDesign volume of SCM cu ft 21695 cf 21 lCalculation method for design volume ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): Simple Method Drainage area for pre -post development analysis is the drainage area to the proposed wet pond. The existing drainage patterns do not change with respect to the site drainage outfall (lowest point on property). All new impervious will drain to wetpond; remaining area on property that does not WET POND Drainage area number ERAL 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 6 Does the SCM have retaining walls, gabion walls or other engineered side slopes? No 7 Are the inlets, outlets, and receiving stream protected from erosion 10- ear storm)? Yes 8 Is there an overflow or bypass for inflow volume in excess of the desi n volume? Yes 9 What is the method for dewatering the SCM for maintenance? Pump (preferred) 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 13 If the SCM is on a single family lot, does (will?) the plat comply with General MDC 10 ? Is there an O&M Agreement that complies with General MDC (11)? N/A 14 Yes 15 Is there an O&M Plan that complies with General MDC (12)? Yes 161 Does the SCM follow the device specific MDC? Yes 17 Was the SCM designed by an NC licensedprofessional? Yes WET POND MDC FROM 02H .1053 18 Sizing method used SA/DA 19 Has a stage/storage table been provided in the calculations? Yes 20 Elevation of the excavated main pool depth (bottom of sediment removal) (fmsl 183.00 21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 185.00 221 Elevation of the bottom of the vegetated shelf (fmsl) 191.00 23 Elevation of the permanent pool (fmsl) 192.00 24 Elevation of the top of the vegetated shelf (fmsl) 193.00 25 Elevation of the temporary pool (fmsl) 193.70 26 Surface area of the main permanent pool (square feet) 7810 27 Volume of the main permanent pool (cubic feet) 21950 cf 28 Average depth of the main pool (feet) 4.00 ft 29 Average depth equation used Equation 3 30 If using equation 3, main pool perimeter (feet) 560.1 ft 31 If using equation 3, width of submerged veg. shelf (feet) 6.0 ft 32 Volume of the forebay (cubic feet) 3987 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) 21695 cf 361 Is the outlet an orifice or a weir? Orifice 37 If orifice, orifice diameter (inches) 2.5 in 38 If weir, weir height (inches) 39 If weir, weir length (inches) 40 Drawdown time for the temporary pool (days) 2.3 41 Are the inlet(s) and outlet located in a manner that avoids short- circuiting? Yes 42 Are berms or baffles provided to improve the flow path? No 43 Depth of forebay at entrance (inches) 60 in 44 Depth of forebay at exit (inches) 12 in 45 Does water flow out of the forebay in a non -erosive manner? Yes 46 Width of the vegetated shelf (feet) 12 ft 47 Slope of vegetated shelf (H:V) 6:1 48 Does the orifice drawdown from below the top surface of the ermanent pooI? Yes 49 Does the pond minimize impacts to the receiving channel from the 1- r, 24-hr storm? Yes 50 Are fountains proposed? (If Y, please provide documentation that 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 Bermudagrass 54 Hasa plantinq plan been provided for the vegetated shelf? Yes ADDITIONAL INFORMATION 55 Please use this space to provide any additional information about the wet pond(s): Berm is used to direct inflow to shallow end of forebay, away from outlet. Wet Pond 2 7:12 PM 3/20/2023