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Home My WebLink AboutSW3240502_Supplement-EZ Form_20240606 (3) Permit Number: (to be provided by DWQ) OF W A TE9 A74151rA NCDENR 0 STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM GRASSED SWALE SUPPLEMENT This form must be filled out,printed and submitted. The Required Items Checklist(Part Ill)must also be filled out,printed and submitted along with all of the required information. I. PROJECT INFORMATION Project name Sage at Marvin Contact name Brandon Maxwell Phone number 704-777-8888 Date April 22,2024 Drainage area number Swale 1 II. DESIGN INFORMATION Site Characteristics Drainage area 681,017.04 ft2 Impervious area 145,708.20 ft2 Percent impervious 21.4% % Design rainfall depth 5.16 inch Peak Flow Calculations 10-yr storm runoff depth 5.16 in 10-yr storm intensity 0.215 in/hr Post-development 10-yr storm peak flow 65.07 ft3/sec Velocity Maximum non-erosive velocity(peak 10-year storm) 0.00 ft/sec Soil characteristics(enter"x"below) Sand/silt(easily erodible) Clay mix(erosion resistant) X Grass Type(enter"x"below) Bermuda Tall fescue Bahiagrass Kentucky bluegrass Grass-legume mixture Swale type: Fill out one of the options below: Option 1: Curb Outlet Swale: Y (Y or N) Maximum velocity 6.63 Insufficient maximum velocity. See appropriate maximum value below in Table 14-2. Side slopes 3.00 :1 Insufficient side slopes.Max is 5:1. Swale length 938.00 ft OK Option 2: Swale Seeking Pollutant Credit("For-Credit"Swale): N (Y or N) Maximum velocity for 10-yr storm ft/sec Side slopes :1 Swale length ft Form SW401-Grassed Swale-Rev.4 Parts I and II.Project Design Summary,Page 1 of 17 Permit Number: (to be provided by DWQ) Swale Characteristics Swale Shape:Enter an"x"in the appropriate cell below: Trapezoidal X Parabolic V-shaped Width of the bottom of the swale 1.00 ft Width of the top of the swale 13.00 ft Additional Information Is the swale sized for all runoff from ultimate build-out? Y(Y or N) OK Is the BMP located in a proposed drainage easement with a Y(Y or N) OK recorded access easement to a public Right of Way(ROW)? What is the distance from the bottom of the swale to the SHWT? 11.85 ft OK What is the ground level elevation? 583.85 fmsl What is the elevation of the bottom of the swale? 581.85 fmsl What is the SHWT elevation? 570.00 fmsl What is the longitudinal slope of the swale? 2.24% OK What is the depth of freeboard? 0.35 ft OK Form SW401-Grassed Swale-Rev.4 Parts I and II.Project Design Summary,Page 2 of 17 Permit Number: (to be provided by DWQ) OF WAr A74151rA NCDENR 0 STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM GRASSED SWALE SUPPLEMENT This form must be filled out,printed and submitted. The Required Items Checklist(Part Ill)must also be filled out,printed and submitted along with all of the required information. I. PROJECT INFORMATION Project name Sage at Marvin Contact name Brandon Maxwell Phone number 704-777-8888 Date April 22,2024 Drainage area number Swale 2 II. DESIGN INFORMATION Site Characteristics Drainage area 5,793.48 ft2 Impervious area 1,873.08 ft2 Percent impervious 32.3% % Design rainfall depth 5.16 inch Peak Flow Calculations 10-yr storm runoff depth 5.16 in 10-yr storm intensity 0.22 in/hr Post-development 10-yr storm peak flow 0.75 ft3/sec Velocity Maximum non-erosive velocity(peak 10-year storm) 0.00 ft/sec Soil characteristics(enter"x"below) Sand/silt(easily erodible) Clay mix(erosion resistant) X Grass Type(enter"x"below) Bermuda Tall fescue Bahiagrass Kentucky bluegrass Grass-legume mixture Swale type: Fill out one of the options below: Option 1: Curb Outlet Swale: Y (Y or N) Maximum velocity 1.53 Insufficient maximum velocity. See appropriate maximum value below in Table 14-2. Side slopes 3.00 :1 Insufficient side slopes.Max is 5:1. Swale length 181.00 ft OK Option 2: Swale Seeking Pollutant Credit("For-Credit"Swale): (Y or N) Maximum velocity for 10-yr storm ft/sec Side slopes :1 Swale length ft Form SW401-Grassed Swale-Rev.4 Parts I and II.Project Design Summary,Page 3 of 17 Permit Number: (to be provided by DWQ) Swale Characteristics Swale Shape:Enter an"x"in the appropriate cell below: Trapezoidal X Parabolic V-shaped Width of the bottom of the swale 1.00 ft Width of the top of the swale 13.00 ft Additional Information Is the swale sized for all runoff from ultimate build-out? Y(Y or N) OK Is the BMP located in a proposed drainage easement with a Y(Y or N) OK recorded access easement to a public Right of Way(ROW)? What is the distance from the bottom of the swale to the SHWT? 8.85 ft OK What is the ground level elevation? 583.85 fmsl What is the elevation of the bottom of the swale? 581.85 fmsl What is the SHWT elevation? 573.00 fmsl What is the longitudinal slope of the swale? 1.07% OK What is the depth of freeboard? 1.73 ft OK Form SW401-Grassed Swale-Rev.4 Parts I and II.Project Design Summary,Page 4 of 17 Permit Number: (to be provided by DWQ) OF WAr A74151rA NCDENR 0 STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM GRASSED SWALE SUPPLEMENT This form must be filled out,printed and submitted. The Required Items Checklist(Part Ill)must also be filled out,printed and submitted along with all of the required information. I. PROJECT INFORMATION Project name Sage at Marvin Contact name Brandon Maxwell Phone number 704-777-8888 Date April 22,2024 Drainage area number Swale 3 II. DESIGN INFORMATION Site Characteristics Drainage area 58,283.28 ft2 Impervious area 16,160.76 ft2 Percent impervious 27.7% % Design rainfall depth 5.16 inch Peak Flow Calculations 10-yr storm runoff depth 5.16 in 10-yr storm intensity 0.22 in/hr Post-development 10-yr storm peak flow 7.16 ft3/sec Velocity Maximum non-erosive velocity(peak 10-year storm) 0.00 ft/sec Soil characteristics(enter"x"below) Sand/silt(easily erodible) Clay mix(erosion resistant) X Grass Type(enter"x"below) Bermuda Tall fescue Bahiagrass Kentucky bluegrass Grass-legume mixture Swale type: Fill out one of the options below: Option 1: Curb Outlet Swale: Y (Y or N) Maximum velocity 2.87 Insufficient maximum velocity. See appropriate maximum value below in Table 14-2. Side slopes 3.00 :1 Insufficient side slopes.Max is 5:1. Swale length ft Insufficient swale length. Option 2: Swale Seeking Pollutant Credit("For-Credit"Swale): (Y or N) Maximum velocity for 10-yr storm ft/sec Side slopes :1 Swale length ft Form SW401-Grassed Swale-Rev.4 Parts I and II.Project Design Summary,Page 5 of 17 Permit Number: (to be provided by DWQ) Swale Characteristics Swale Shape:Enter an"x"in the appropriate cell below: Trapezoidal X Parabolic V-shaped Width of the bottom of the swale 1.00 ft Width of the top of the swale 13.00 ft Additional Information Is the swale sized for all runoff from ultimate build-out? Y(Y or N) OK Is the BMP located in a proposed drainage easement with a Y(Y or N) OK recorded access easement to a public Right of Way(ROW)? What is the distance from the bottom of the swale to the SHWT? 8.85 ft OK What is the ground level elevation? 583.85 fmsl What is the elevation of the bottom of the swale? 581.85 fmsl What is the SHWT elevation? 573.00 fmsl What is the longitudinal slope of the swale? 1.10% OK What is the depth of freeboard? 1.24 ft OK Form SW401-Grassed Swale-Rev.4 Parts I and II.Project Design Summary,Page 6 of 17 Permit Number: (to be provided by DWQ) OF WAr A74151rA NCDENR 0 STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM GRASSED SWALE SUPPLEMENT This form must be filled out,printed and submitted. The Required Items Checklist(Part Ill)must also be filled out,printed and submitted along with all of the required information. I. PROJECT INFORMATION Project name Sage at Marvin Contact name Brandon Maxwell Phone number 704-777-8888 Date April 22,2024 Drainage area number Swale 4 II. DESIGN INFORMATION Site Characteristics Drainage area 274,776.48 ft2 Impervious area 102,409.56 ft2 Percent impervious 37.3% % Design rainfall depth 5.16 inch Peak Flow Calculations 10-yr storm runoff depth 5.16 in 10-yr storm intensity 0.22 in/hr Post-development 10-yr storm peak flow 32.81 ft3/sec Velocity Maximum non-erosive velocity(peak 10-year storm) 0.00 ft/sec Soil characteristics(enter"x"below) Sand/silt(easily erodible) Clay mix(erosion resistant) X Grass Type(enter"x"below) Bermuda Tall fescue Bahiagrass Kentucky bluegrass Grass-legume mixture Swale type: Fill out one of the options below: Option 1: Curb Outlet Swale: Y (Y or N) Maximum velocity 5.69 Insufficient maximum velocity. See appropriate maximum value below in Table 14-2. Side slopes 3.00 :1 Insufficient side slopes.Max is 5:1. Swale length 893.00 ft OK Option 2: Swale Seeking Pollutant Credit("For-Credit"Swale): N (Y or N) Maximum velocity for 10-yr storm ft/sec Side slopes :1 Swale length ft Form SW401-Grassed Swale-Rev.4 Parts I and II.Project Design Summary,Page 7 of 17 Permit Number: (to be provided by DWQ) Swale Characteristics Swale Shape:Enter an"x"in the appropriate cell below: Trapezoidal X Parabolic V-shaped Width of the bottom of the swale 1.00 ft Width of the top of the swale 13.00 ft Additional Information Is the swale sized for all runoff from ultimate build-out? Y(Y or N) OK Is the BMP located in a proposed drainage easement with a Y(Y or N) OK recorded access easement to a public Right of Way(ROW)? What is the distance from the bottom of the swale to the SHWT? 8.85 ft OK What is the ground level elevation? 583.85 fmsl What is the elevation of the bottom of the swale? 581.85 fmsl What is the SHWT elevation? 573.00 fmsl What is the longitudinal slope of the swale? 2.35% OK What is the depth of freeboard? 0.77 ft OK Form SW401-Grassed Swale-Rev.4 Parts I and II.Project Design Summary,Page 8 of 17 Permit Number: (to be provided by DWQ) OF WAr A74151rA NCDENR 0 STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM GRASSED SWALE SUPPLEMENT This form must be filled out,printed and submitted. The Required Items Checklist(Part Ill)must also be filled out,printed and submitted along with all of the required information. I. PROJECT INFORMATION Project name Sage at Marvin Contact name Brandon Maxwell Phone number 704-777-8888 Date April 22,2024 Drainage area number Swale 5 II. DESIGN INFORMATION Site Characteristics Drainage area 179,989.92 ft2 Impervious area 57,934.80 ft2 Percent impervious 32.2% % Design rainfall depth 5.16 inch Peak Flow Calculations 10-yr storm runoff depth 5.16 in 10-yr storm intensity 0.22 in/hr Post-development 10-yr storm peak flow 21.49 ft3/sec Velocity Maximum non-erosive velocity(peak 10-year storm) 0.00 ft/sec Soil characteristics(enter"x"below) Sand/silt(easily erodible) Clay mix(erosion resistant) X Grass Type(enter"x"below) Bermuda Tall fescue Bahiagrass Kentucky bluegrass Grass-legume mixture Swale type: Fill out one of the options below: Option 1: Curb Outlet Swale: Y (Y or N) Maximum velocity 5.19 Insufficient maximum velocity. See appropriate maximum value below in Table 14-2. Side slopes 3.00 :1 Insufficient side slopes.Max is 5:1. Swale length 864.00 ft OK Option 2: Swale Seeking Pollutant Credit("For-Credit"Swale): N (Y or N) Maximum velocity for 10-yr storm ft/sec Side slopes :1 Swale length ft Form SW401-Grassed Swale-Rev.4 Parts I and II.Project Design Summary,Page 9 of 17 Permit Number: (to be provided by DWQ) Swale Characteristics Swale Shape:Enter an"x"in the appropriate cell below: Trapezoidal X Parabolic V-shaped Width of the bottom of the swale 1.00 ft Width of the top of the swale 13.00 ft Additional Information Is the swale sized for all runoff from ultimate build-out? Y(Y or N) OK Is the BMP located in a proposed drainage easement with a Y(Y or N) OK recorded access easement to a public Right of Way(ROW)? What is the distance from the bottom of the swale to the SHWT? 6.07 ft OK What is the ground level elevation? 578.07 fmsl What is the elevation of the bottom of the swale? 576.07 fmsl What is the SHWT elevation? 570.00 fmsl What is the longitudinal slope of the swale? 2.44% OK What is the depth of freeboard? 0.98 ft OK Form SW401-Grassed Swale-Rev.4 Parts I and II.Project Design Summary,Page 10 of 17 Permit Number: (to be provided by DWQ) OF W A TE9 A74151rA NCDENR 0 STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM GRASSED SWALE SUPPLEMENT This form must be filled out,printed and submitted. The Required Items Checklist(Part Ill)must also be filled out,printed and submitted along with all of the required information. I. PROJECT INFORMATION Project name Sage at Marvin Contact name Brandon Maxwell Phone number 704-777-8888 Date April 22,2024 Drainage area number Swale 6 II. DESIGN INFORMATION Site Characteristics Drainage area 37,984.32 ft2 Impervious area 18,295.20 ft2 Percent impervious 48.2% % Design rainfall depth 5.16 inch Peak Flow Calculations 10-yr storm runoff depth 5.16 in 10-yr storm intensity 0.22 in/hr Post-development 10-yr storm peak flow 5.28 ft3/sec Velocity Maximum non-erosive velocity(peak 10-year storm) 0.00 ft/sec Soil characteristics(enter"x"below) Sand/silt(easily erodible) Clay mix(erosion resistant) X Grass Type(enter"x"below) Bermuda Tall fescue Bahiagrass Kentucky bluegrass Grass-legume mixture Swale type: Fill out one of the options below: Option 1: Curb Outlet Swale: Y (Y or N) Maximum velocity 3.62 Insufficient maximum velocity. See appropriate maximum value below in Table 14-2. Side slopes 3.00 :1 Insufficient side slopes.Max is 5:1. Swale length 322.00 ft OK Option 2: Swale Seeking Pollutant Credit("For-Credit"Swale): (Y or N) Maximum velocity for 10-yr storm ft/sec Side slopes :1 Swale length ft Form SW401-Grassed Swale-Rev.4 Parts I and II.Project Design Summary,Page 11 of 17 Permit Number: (to be provided by DWQ) Swale Characteristics Swale Shape:Enter an"x"in the appropriate cell below: Trapezoidal X Parabolic V-shaped Width of the bottom of the swale 1.00 ft Width of the top of the swale 13.00 ft Additional Information Is the swale sized for all runoff from ultimate build-out? Y(Y or N) OK Is the BMP located in a proposed drainage easement with a Y(Y or N) OK recorded access easement to a public Right of Way(ROW)? What is the distance from the bottom of the swale to the SHWT? 6.07 ft OK What is the ground level elevation? 578.07 fmsl What is the elevation of the bottom of the swale? 576.07 fmsl What is the SHWT elevation? 570.00 fmsl What is the longitudinal slope of the swale? 2.40% OK What is the depth of freeboard? 1.45 ft OK Form SW401-Grassed Swale-Rev.4 Parts I and II.Project Design Summary,Page 12 of 17 Permit Number: (to be provided by DWQ) OF WAr A74151rA NCDENR 0 STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM GRASSED SWALE SUPPLEMENT This form must be filled out,printed and submitted. The Required Items Checklist(Part Ill)must also be filled out,printed and submitted along with all of the required information. I. PROJECT INFORMATION Project name Sage at Marvin Contact name Brandon Maxwell Phone number 704-777-8888 Date April 22,2024 Drainage area number Swale 7 II. DESIGN INFORMATION Site Characteristics Drainage area 9,147.60 ft2 Impervious area 3,571.92 ft2 Percent impervious 39.0% % Design rainfall depth 5.16 inch Peak Flow Calculations 10-yr storm runoff depth 5.16 in 10-yr storm intensity 0.22 in/hr Post-development 10-yr storm peak flow 1.24 ft3/sec Velocity Maximum non-erosive velocity(peak 10-year storm) 0.00 ft/sec Soil characteristics(enter"x"below) Sand/silt(easily erodible) Clay mix(erosion resistant) X Grass Type(enter"x"below) Bermuda Tall fescue Bahiagrass Kentucky bluegrass Grass-legume mixture Swale type: Fill out one of the options below: Option 1: Curb Outlet Swale: Y (Y or N) Maximum velocity 2.29 Insufficient maximum velocity. See appropriate maximum value below in Table 14-2. Side slopes 3.00 :1 Insufficient side slopes.Max is 5:1. Swale length 359.00 ft OK Option 2: Swale Seeking Pollutant Credit("For-Credit"Swale): (Y or N) Maximum velocity for 10-yr storm ft/sec Side slopes :1 Swale length ft Form SW401-Grassed Swale-Rev.4 Parts I and II.Project Design Summary,Page 13 of 17 Permit Number: (to be provided by DWQ) Swale Characteristics Swale Shape:Enter an"x"in the appropriate cell below: Trapezoidal X Parabolic V-shaped Width of the bottom of the swale 1.00 ft Width of the top of the swale 13.00 ft Additional Information Is the swale sized for all runoff from ultimate build-out? Y(Y or N) OK Is the BMP located in a proposed drainage easement with a Y(Y or N) OK recorded access easement to a public Right of Way(ROW)? What is the distance from the bottom of the swale to the SHWT? 6.07 ft OK What is the ground level elevation? 578.07 fmsl What is the elevation of the bottom of the swale? 576.07 fmsl What is the SHWT elevation? 570.00 fmsl What is the longitudinal slope of the swale? 2.14% OK What is the depth of freeboard? 1.71 ft OK Form SW401-Grassed Swale-Rev.4 Parts I and II.Project Design Summary,Page 14 of 17 Permit Number: (to be provided by DWQ) OF WAr A74151rA NCDENR 0 STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM GRASSED SWALE SUPPLEMENT This form must be filled out,printed and submitted. The Required Items Checklist(Part Ill)must also be filled out,printed and submitted along with all of the required information. I. PROJECT INFORMATION Project name Sage at Marvin Contact name Brandon Maxwell Phone number 704-777-8888 Date April 22,2024 Drainage area number Swale 8 II. DESIGN INFORMATION Site Characteristics Drainage area 70,567.20 ft2 Impervious area 38,463.48 ft2 Percent impervious 54.5% % Design rainfall depth 5.16 inch Peak Flow Calculations 10-yr storm runoff depth 5.16 in 10-yr storm intensity 0.22 in/hr Post-development 10-yr storm peak flow 9.81 ft3/sec Velocity Maximum non-erosive velocity(peak 10-year storm) 0.00 ft/sec Soil characteristics(enter"x"below) Sand/silt(easily erodible) Clay mix(erosion resistant) X Grass Type(enter"x"below) Bermuda Tall fescue Bahiagrass Kentucky bluegrass Grass-legume mixture Swale type: Fill out one of the options below: Option 1: Curb Outlet Swale: Y (Y or N) Maximum velocity 4.21 Insufficient maximum velocity. See appropriate maximum value below in Table 14-2. Side slopes 3.00 :1 Insufficient side slopes.Max is 5:1. Swale length 930.00 ft OK Option 2: Swale Seeking Pollutant Credit("For-Credit"Swale): (Y or N) Maximum velocity for 10-yr storm ft/sec Side slopes :1 Swale length ft Form SW401-Grassed Swale-Rev.4 Parts I and II.Project Design Summary,Page 15 of 17 Permit Number: (to be provided by DWQ) Swale Characteristics Swale Shape:Enter an"x"in the appropriate cell below: Trapezoidal X Parabolic V-shaped Width of the bottom of the swale 1.00 ft Width of the top of the swale 13.00 ft Additional Information Is the swale sized for all runoff from ultimate build-out? Y(Y or N) OK Is the BMP located in a proposed drainage easement with a Y(Y or N) OK recorded access easement to a public Right of Way(ROW)? What is the distance from the bottom of the swale to the SHWT? 6.07 ft OK What is the ground level elevation? 578.07 fmsl What is the elevation of the bottom of the swale? 576.07 fmsl What is the SHWT elevation? 570.00 fmsl What is the longitudinal slope of the swale? 2.37% OK What is the depth of freeboard? 1.27 ft OK Form SW401-Grassed Swale-Rev.4 Parts I and II.Project Design Summary,Page 16 of 17 Permit No: (to be assigned by DWQ) III. REQUIRED ITEMS CHECKLIST Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to indicate the following design requirements have been met. If the applicant has designated an agent,the agent may initial below. If a requirement has not been met,attach justification. Initials Pagel Plan Sheet No. JR CS100- 1. Plans(1"=50'or larger)of the entire site showing: CS102, -Design at ultimate build-out, CG100- -Off-site drainage(if applicable), CG-102, -Delineated drainage basins(include Rational C coefficient per basin), CS501- -Swale dimensions(width, length,depth), CS506 -Maintenance access, -Proposed drainage easement and public right of way(ROW), -Grass species,and -Boundaries of drainage easement. JR CS501- 2. Plan details(1"=50'or larger)for the grassed swale showing: CS506 -Swale dimensions(width, length,depth), -Maintenance access, -Proposed drainage easement and public right of way(ROW), -Design at ultimate build-out, -Grass species, -Off-site drainage(if applicable),and -Boundaries of drainage easement. JR CS501- 3. Section view of the grassed swale(1"=20'or larger)showing: CS506 -Side slopes, -Longitudinal slope, -Freeboard -Swale dimensions,and -SHWT level(s) JR 4. Supporting calculations(including maximum velocity calculations for applicable storms) JR 5. A copy of the signed and notarized operation and maintenance(O&M)agreement. JR * 6. A copy of the deed restrictions(if required). * Please see this submission package for required information. SW401-Grassed Swale-Rev.3 Part III, Page 17 of 17