Wedgefield Phase IV Subdivision - 1119-Supplemental form

WET POND1 Drainage area number1 Total coastal wetlands area (sq ft)0 - Parking / driveway (sq ft)Total surface water area (sq ft)0 - Sidewalk (sq ft)Total drainage area (sq ft)2081088 sf - Roof (sq ft)630471 sfBUA associated with existing development (sq ft) 6226 sf - Roadway (sq ft)248688 sfProposed new BUA (sq ft)879159 sf - Other, please specify in the comment box below (sq ft) 0 Percent BUA of drainage area42%Total BUA (sq ft)879159 sfDesign rainfall depth (in)1.0 inMinimum volume required (cu ft) 79540 cfDesign volume of SCM (cu ft)269973 cf#1 Is the SCM sized to treat the SW from all surfaces at build-out? Yes#7 If applicable, with the SCM be cleaned out after construction?Yes#2 Is the SCM located on or near contaminated soils? No#8 Does the mainetenance access comply with General MDC (8)?Yes#3 What are the side slopes of the SCM (H:V)? 3:1#9 Does the drainage easement comply with General MDC (9)?Yes#3 Does the SCM have retaining walls, gabion walls or other engineered side slopes? No#10 If the SCM is on a single family lot, does the plat comply with General MDC (10)?#4 Are the inlets, outlets, and receiving stream protected from erosion (10-year storm)? Yes#11 Is there an O&M Agreement that complies with General MDC (11)?Yes#5 Is there a a bypass for flows in excess of the design flow? Yes#12 Is there an O&M Plan that complies with General MDC (12)?Yes#6 What is the method for dewatering the SCM for maintenance?Pump (preferred)#13 Was the SCM designed by an NC licensed professional?Yes#1 Method usedSA/DA#6 Width of the vegetated shelf (feet)6 ft#1 Surface area of the main permanent pool (square feet) 81085 sf#6 Location of vegetated shelfAbove Normal Pool#1 Volume of the main permanent pool (cubic feet) 851594 cf#6 Elevation of top of shelf (fmsl)259 ft#2 Average depth of the main pool (feet) 10.5 ft #6 Elevation of bottom of shelf (fmsl)258 ft#2 Was the vegetated shelf included in the calculation of average depth? No #6 Slope of vegetated shelf (H:V)6:1#2 Elevation of the bottom of the permanent pool (fmsl) 245 ft #7 Diameter of drawdown orifice (inches)5.0 in#2 Elevation of the top of the permanent pool (fmsl) 257.7 ft #7 Drawdown time for the temporary pool (hours)60 hrs#2 Elevation of the top of the temporary pool (fmsl) 258.85 ft #7 Does the orifice drawdown from below the top surface of the permanent pool?Yes#3 Depth provided for sediment storage (inches) 12 in#8 Does the pond minimize impacts to the receiving channel from the 1-yr, 24-hr storm? Yes#4 Are the inlet(s) and outlet located in a manner that avoids short-circuiting?Yes #9 Are fountains proposed?No#9 If yes, is documentation provided per Wet Pond MDC (9)?#10 Is a trash rack or other device provided to protect the outlet system? Yes#5 Volume of the forebay (cubic feet) 149,931#11 Are the dam and embankment planted in non-clumping turf grass? Yes#5 Is this 15-20% of the volume in the main pool? Yes#11 Species of turf that will be used on the dam and embankment Bermuda Sod#5 Depth of forebay at entrance (inches) 166 in#11 Describe the planting plan for the vegetated shelf:#5 Depth of forebay at exit (inches) 152 in#5 Does water flow out of the forebay in a non-erosive manner? Yes#5 Clean-out depth for forebay (inches) 72 in#5 Will the forebay be cleaned out when the depth is reduced to less than the above? YesWedgefield Phase IVBreak down of BUA in the drainage area (both new and existing):COMPLIANCE WITH THE APPLICABLE STORMWATER PROGRAMStormwater program(s) that apply (please specify):Phase II Post-Construction SWWET POND MDC FROM 02H .1053#4 Describe any measures, such as berms or baffles, that will be taken to improve the flow path:N/AVegetated shelf to be planted with a combination of shallow water and shallow land plants, spacings to be a maximum of 18 inches on center. Fertilizer shall be used according to recommendation from soil analysis. See plan details for listing of plants to be used.ADDITIONAL INFORMATIONPlease use this space to provide any additional information about this wet pond that you think is relevant to the review:GENERAL MDC FROM 02H .1050THE DRAINAGE AREAWet Pond19:43 AM 7/2/2018