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Home My WebLink AboutSW6201201_1641 Supplement Wet Pond_20201210SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 lProiectName oject Area (ac) )astal Wetland Area (ac) irface Water Area (ac) this project High or Low Density? )es this protect use an off -site SCM? Static Line B 10.24 0 0.38 High No COMPLIANCE WITH 02H .1003(4) 7 Width of ve etated setbacks provided feet No surface water on project area 8 Will the vegetated setback remain vegetated? N/A 9 If BUA is proposed in the setback, does it meet NCAC 02H.1003 4 c-d ? 10 1 Is streambank stabilization proposed on this project? NUMBER AND TYPE OF SCMs: 11 Infiltration System 12 Bioretention Cell 13 Wet Pond 1 14 Stormwater Wetland 15 Permeable Pavement 16 Sand Filter 17 Rainwater Harvesting RWH 18 Green Roof 19 Level Spreader -Filter Strip LS-FS 20 Disconnected Impervious Surface DIS 21 Treatment Swale 22 Dry Pond StormFilter Silva Cell Ba filter IFilterra 23 24 25 26 FORMS LOADED ER CERTIFICATION ame and Title: rganization: treet address: C. Scott Brown, PE Vice President 4D Site Solutions Inc. 409 Chicago Dr. Ste. 112 Fayetteville, NC 28306 910-426-6777 sbrown(a)4dsitesolutions.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. Seal Signature of Designer 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 Iow densit areas? No 4 If so number of Iow 4-ify drainage areas 0 5 Is all/part of this project subject to previous rule versions? No FORMS LOADED WET POND 1 Drainage area number 2 Minimum required treat GENERAL 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-yea r storm)? Yes 8 Is there an overflow or bypass for inflow volume in excess of the design 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)? N/A 14 Is there an O&M Agreement that complies with General MDC (11)? 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 361.00 21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 363.00 221 Elevation of the bottom of the vegetated shelf (fmsl) 368.00 23 Elevation of the permanent pool (fmsl) 368.50 24 Elevation of the top of the vegetated shelf (fmsl) 369.00 25 Elevation of the temporary pool (fmsl) 370.63 26 Surface area of the main permanent pool (square feet) 11880 27 Volume of the main permanent pool (cubic feet) 67925 cf 28 Average depth of the main pool (feet) 5.71 ft 29 Average depth equation used Equation 2 30 If using equation 3, main pool perimeter (feet) 31 If using equation 3, width of submerged veg. shelf (feet) 32 Volume of the forebay (cubic feet) 12441 cf 33 Is this 15-20% of the volume in the main pool? Yes 34 Clean -out depth for forebay (inches) 24 in 35 Design volume of SCM (cu ft) 91433 cf 361 Is the outlet an orifice or a weir? Orifice 37 If orifice, orifice diameter (inches) 3 in 38 If weir, weir height (inches) 39 If weir, weir length (inches) 40 Drawdown time for the temporary pool (days) 2.1 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) 96 in 44 Depth of forebay at exit (inches) 90 in 45 Does water flow out of the forebay in a non -erosive manner? Yes 46 Width of the vegetated shelf (feet) 6 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 Centepede 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): Wet Pond 1 3:43 PM 12/10/2020