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Home My WebLink About20140221 Ver 1_Stormwater Info_20140404Strickland, Bev From: Devane, Boyd Sent: Friday, April 04, 2014 12:22 PM To: Strickland, Bev Subject: Luck Stone files # 14 -0221 Attachments: 13516 SHEET 3 032814.pdf, 13516 SuppForm- WetPond- 20120418- DWQ- SPU.pdf, 13516 Supplement- FiltStripLevelSpread- Rev.10_29June2012.pdf, 13516 Wet Pond design layout.pdf, 13516 Level Spreader evfs.pdf Please file these files and my email in the Charles Luck Stone file #14 -0221 From: Wes Webb [mailto:wwebb(aawck.com] Sent: Wednesday, April 02, 2014 11:54 AM To: Devane, Boyd Cc: Bruce Smith; Howie Long; Mark Vigil Subject: Luck Stone Raleigh Contractor Yard - Riparian Buffer Impact Boyd The stormwater treatment will be reviewed by the City of Raleigh. Attached are copies of the design work sheets for the wet pond and level spreader. This should help confirm that the project will provide the required treatment. Wes Webb, PE Alley, Williams, Carmen & King, Inc. 120 South Main St. PO Box 1248 Kannapolis, NC 28082 -1248 Tel. - (704)938 -1515 Fax - (704)938 -6810 wwebbCcDawck.com www.awck.com Permit No. (to be provided by DWQ) AL AW*I o v� r NCDENR a Rational C, post - development STORMWATER MANAGEMENT PERMIT APPLICATION FORM Rainfall intensity: 1 -yr, 24 -hr storm 401 CERTIFICATION APPLICATION FORM Pre - development 1 -yr, 24 -hr peak flow WET DETENTION BASIN SUPPLEMENT Post - development 1 -yr, 24 -hr peak flow This form must be filled out, printed and submitted. The Required Items Checklist (Part III) must be printed, filled out and submitted along with all of the required information. I. PROJECT INFORMATION Elevations Project name Raleigh Contractor Yard Relocation - Charles Luck Stone Center Contact person Wes Webb, PE Phone number 704 - 938 -1515 Date 3/28/2014 Drainage area number Bottom of 1 Oft vegetated shelf elevation II. DESIGN INFORMATION Sediment cleanout, top elevation (bottom of pond) Site Characteristics Sediment cleanout, bottom elevation Drainage area 258,746 ft2 Impervious area, post - development 176,854 ft2 % impervious 68.35 % Design rainfall depth 1.0 in Storage Volume: Non -SA Waters Minimum volume required 14,342 ft3 Volume provided 15,830 ft3 OK, volume provided is equal to or in excess of volume required. Storage Volume: SA Waters 1.5' runoff volume ft3 Pre - development 1 -yr, 24 -hr runoff ft3 Post - development 1 -yr, 24 -hr runoff ft3 Minimum volume required ft3 Volume provided ft3 Peak Flow Calculations Is the pre /post control of the 1 yr 24hr storm peak flow required? Y (Y or N) 1 -yr, 24 -hr rainfall depth 2.9 in Rational C, pre - development 0.25 (unitless) Rational C, post - development 0.43 (unitless) Rainfall intensity: 1 -yr, 24 -hr storm 4.90 in/hr OK Pre - development 1 -yr, 24 -hr peak flow 3.19 ft3 /sec Post - development 1 -yr, 24 -hr peak flow 1.07 ft3 /sec Pre /Post 1 -yr, 24 -hr peak flow control -2.12 ft3 /sec Elevations Temporary pool elevation 248.20 fmsl Permanent pool elevation 247.00 fmsl SHWT elevation (approx. at the perm. pool elevation) fmsl Top of 1 Oft vegetated shelf elevation 247.50 fmsl Bottom of 1 Oft vegetated shelf elevation 246.50 fmsl Sediment cleanout, top elevation (bottom of pond) 243.00 fmsl Sediment cleanout, bottom elevation 242.00 fmsl Sediment storage provided 1.00 ft Is there additional volume stored above the state - required temp. pool? Y (Y or N) Elevation of the top of the additional volume 248.2 fmsl OK Form SW401 -Wet Detention Basin- Rev.9- 4/18/12 Parts I. & II. Design Summary, Page 1 of 2 Permit No. (to be provided by DWQ) II. DESIGN INFORMATION Surface Areas Area, temporary pool 15,016 ft' Area REQUIRED, permanent pool 10,220 ft OK SA/DA ratio 3.95 (unifless) OK Area PROVIDED, permanent pool, A,._p.I 10,494 ft' OK Area, bottom of 1 Oft vegetated shelf, An t shelf 8,528 ft OK Area, sediment cleanout, top elevation (bottom of pond), Ab t �,d 4,030 ft' OK Volumes Y (Y or N) OK Volume, temporary pool 15,830 ft3 OK Volume, permanent pool, V,._p.I 28,095 ft3 OK Volume, forebay (sum of forebays if more than one forebay) 6,126 ft3 OK Forebay% of permanent pool volume 21.8% % OK SA/DA Table Data Bottom drain. Any remaining volume to be pumped. Design TSS removal 90 % Coastal SA/DA Table Used? N (Y or N) Mountain /Piedmont SA/DA Table Used? Y (Y or N) SA/DA ratio 3.95 (unifless) Average depth (used in SA/DA table): Calculation option 1 used? (See Figure 10 -2b) N (Y or N) Volume, permanent pool, V,._PI 28,095 ft3 Area provided, permanent pool, A,._p.I 10,494 ft' Average depth calculated ft Need 3 ft min. Average depth used in SA /DA, da,, (Round to nearest 0.5ft) ft Calculation option 2 used? (See Figure 10 -2b) Y (Y or N) Area provided, permanent pool, A,._p.I 10,494 ft' Area, bottom of 1 Oft vegetated shelf, Ah�t shelf 8,528 ft Area, sediment cleanout, top elevation (bottom of pond), Ab t ,d 4,030 ftz "Depth" (distance b/w bottom of 1 Oft shelf and top of sediment) 3.50 ft Average depth calculated 3.22 ft OK Average depth used in SA /DA, da,,, (Round to down to nearest 0.5ft) 3.0 ft OK Drawdown Calculations Drawdown through orifice? Y (Y or N) Diameter of orifice (if circular) 2.00 in Area of orifice (if- non - circular) in Coefficient of discharge (Co) 0.60 (unitless) Driving head (Ho) 0.37 ft Drawdown through weir? N (Y or N) Weir type (unitless) Coefficient of discharge (Cw) ( unitless) Length of weir (L) ft Driving head (H) ft Pre - development 1 -yr, 24 -hr peak flow 3.19 ft3 /sec Post - development 1 -yr, 24 -hr peak flow 12.50 ft3 /sec Storage volume discharge rate (through discharge orifice or weir) 0.06 ft3 /sec Storage volume drawdown time 2.86 days OK, draws down in 2 -5 days. Additional Information Vegetated side slopes 3 :1 OK Vegetated shelf slope 10 :1 OK Vegetated shelf width 10.0 ft OK Length of flowpath to width ratio 4 :1 OK Length to width ratio 3.6 :1 OK Trash rack for overflow & orifice? Y (Y or N) OK Freeboard provided 7.6 ft OK Vegetated filter provided? N (Y or N) OK Recorded drainage easement provided? Y (Y or N) OK Capures all runoff at ultimate build -out? Y (Y or N) OK Drain mechanism for maintenance or emergencies is Bottom drain. Any remaining volume to be pumped. Form SW401 -Wet Detention Basin- Rev.9- 4/18/12 Parts I. & II. 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NC 28082 )00./938 -1515 RALEIGH, NORTH CAROLINA 6: 13 Form SW401 - LS -VFS - 29June2012 - Rev.10 page 1 of 3 o�oF w ar�gv� NCDENR p Y STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM LEVEL SPREADER - VEGETATED FILTER STRIP (LS -VFS) SUPPLEMENT This form must be completely filled out, printed, initialed, and submitted. I. PROJECT INFORMATION Project name Raleigh Contractor Yard Relocation - Charles Luck Stone Center Contact name Wes Webb, PE Phone number 704 - 938 -1515 Date March 28, 2014 Drainage area number II. DESIGN INFORMATION The purpose of the LS -VFS Pollutant removal: 40% TSS, 30% TN, 35% TP Stormwater enters LS -VFS from The drainage area Type of VFS Engineered filter strip (graded & sodded, slope < 8 %) Explanation of any "Other" responses above If Stormwater Enters the LS -VFS from the Drainage Area Drainage area 34,848 fig Impervious surface area 24,829 fe Percent impervious 71.25 % Rational C coefficient 0.47 Peak flow from the 1 in /hr storm 0.38 cfs Time of concentration 5.00 min Rainfall intensity, 10- yrstorm 7.22 in /hr Peak flow from the 10 -yr storm 2.71 cfs Design storm 10 -year storm Maximum amount of flow directed to the LS-VFS 2.7 cfs Is a flow bypass system going to be used? N (Y or N) Explanation of any "Other" responses above If Stormwater Enters the LS -VFS from a BMP Do not complete this section of the form. Type of BMP Pick one Peak discharge from the BMP during the design storm cfs Peak discharge from the BMP during the 10 -year storm cfs Do not complete this section of the form. Maximum capacity of a 100 -foot long LS-VFS 10 cfs Peak flow directed to the LS-VFS cfs Do not complete this section of the form. Is a flow bypass system going to be used? (Y or N) Explanation of any "Other" responses above Form SW401 - LS -VFS - 29June2012 - Rev.10 page 1 of 3 LS -VFS Design Forebay surface area Depth of forebay at stormwater entry point Depth of forebay at stormwater exit point Feet of level lip needed per cfs Computed minimum length of the level lip needed Length of level lip provided Width of VFS Elevation at downslope base of level lip Elevation at the end of the VFS that is farthest from the LS Slope (from level lip to the end of the VFS) Are any draws present in the VFS? Is there a collector swale at the end of the VFS? Bypass System Design (if applicable) Is a bypass system provided? Is there an engineered flow splitting device? Dimensions of the channel (see diagram below): M B W y (flow depth for 10 -year storm) freeboard (during the 10 -year storm) Peak velocity in the channel during the 10 -yr storm Channel lining material Does the bypass discharge through a wetland? Does the channel enter the stream at an angle? Explanation of any "Other' responses above 200 sq ft Forebay is adequately sized. 18 in 18 in Too deep. 10 ft/cfs 27 ft 30 ft 33 ft 251.00 fmsl 250.40 fmsl 1.82 % N (Y or N) OK N (Y or N) (Y or N) (Y or N) ft ft ft ft ft fUsec Pick one (Y or N) (Y or N) W ♦ B Form SW401 - LS -VFS - 29June2012 - Rev. 10 page 2 of 3 Site Luck Stone Raleigh Contractor Yard Relocation Date 3/28/2014 # 13516 Wet Pond Design Summary Drainage Area 5.94 Acres Target Surface Area 10220 ft2 258746 ft2 Actual Surface Area 10630 ft2 Impervious Area 4.06 Acres Impervious Cover 68.35% Target SA /DA 3.95 Actual SA /DA 4.11 Option 1 Avg Depth 2.59 Target Avg Depth 3 Pond Depth 4 Option 2 Avg Depth 3.08 Forebay % 19.80% 20% target Total Basin L/W 3.62 Litoral Shelf Main Basin Dimensions Elevation 247 ft Bottom of Shelf Elevation 246.50 ft Depth 0.5 ft Bottom of Shelf Length 144.00 ft Bench side slope 10 ft Bottom of Shelf Width 45.00 ft Rear side slope 2 ft Bottom of Shelf Area 6480.00 ft2 Length of Normal Pool 150 ft Bottom Elevation 243.00 ft Width of Normal Pool 55 ft Bottom Length 130.00 ft Surface Area 8250 ft2 Bottom Width 31.00 ft Main Basin L/W Ratio 2.73 Bottom Area 4030.00 ft2 Deep Pool Sediment Storage Bottom Elevation 242.00 ft Side slope 2 ft Sediment Storage Bottom Length 126.00 ft2 Depth 3.5 ft Sediment Storage Bottom Width 27.00 ft2 Sediment Depth 1 ft Sediment Storage Bottom Area 3402.00 ft2 Forebay Forebay Dimensions Elevation 247.00 ft Bottom Elevation 243.00 ft side slope 2.00 ft Bottom Length 19.00 ft Depth 4.00 ft Bottom Width 15.00 ft Length 35.00 ft Bottom Area 285.00 ft2 Width 68.00 ft Bottom of Shelf Elevation 246.50 ft Dam Width (at Normal Pool) 14.00 ft Bottom of Shelf Length 33.00 ft Surface Area 2380 ft2 Bottom of Shelf Width 66.00 ft Sediment Depth 1 ft Bottom of Shelf Area 2178.00 ft2 Sediment Storage Bottom Elevation 242.00 ft Sediment Storage Bottom Length 15.00 ft2 Sediment Storage Bottom Width 11.00 ft2 Sediment Storage Bottom Area 165.00 ft2 Stage Storage Values Main Pond Forebay Total Basin Surface Incremental Surface Incremental Total Surface Incremental Stage Elevation Area volume Total Volume Stage Elevation Area volume Volume Area volume Total Volume 0.00 243.00 4030 0 0 0 243.00 900 0 0 4930 0 0 1.00 244.00 4690 4360 4360 1.00 244.00 1188 1044 1044 5878 5404 5404 2.00 245.00 5382 5036 9396 2.00 245.00 1508 1348 2392 6890 6384 11788 3.00 246.00 6106 5744 15140 3.00 246.00 1860 1684 4076 7966 7428 19216 3.50 246.50 6480 3146.5 18287 3.50 246.50 2048 977 5053 8528 4123.5 23340 4.00 247.00 8250 3682.5 21969 4.00 247.00 2244 1073 6126 10494 4755.5 28095 Site Luck Stone Raleigh Contractor Yard Relocation # 13516 Level Spreader Properties Maximum Design Flow (10 Year) 2.71 cfs Blind Swale Provided Yes Bypass Channel Required No Length of Level Spreader 30.0 ft Slope of Level Spreader 0.0 % Length of Stone Strip 3.0 ft Width of Vegetated Filter Strip 30.0 ft Length of Vegetated Filter Strip 30.0 ft Vegetated Filter Strip Cross Slope 0.0 % Vegetated Filter Strip Slope 1.8 % Terrain Slope Draining to the Basin 2.8 % Date 3/28/2014