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HomeMy WebLinkAboutSW6191203_Supplement-EZ Form_20200325SUP PLEMENT-EZ COVER PAGE LOAD SUPPLEMENT FORMS NUMBER AND TYPE OF SCMs: 11 Infiltration System 0 12 Bioretention Cell 0 ` 13 Wet Pond 0 14 Stormwater Wetland 0 15 Permeable Pavement 0 16 Sand Filter 0 17 Rainwater Harvesting RWH 0 18 Green Roof 0 19 Level Spreader -Filter Strip LS-FS 0 20 Disconnected Impervious Surface (DIS) 0 21 Treatment Swale 0 22 Dry Pond 0 23 StormFilter 0 24 Silva Cell 0 25 Ba filter 0 26 Filterra 0 LOAD SUPPLEMENT FORMS DESIGNER CERTIFICATION 27 Name and Title: Jeremy Thomas,. PE. -President 28 Organization: J Thomas Engineering Inc. 29 Street address: 143 Charlotte Avenue, Suite 104 30 City., Zip: Sanford, NC 27330 31 _State, Phone numbers : _ _ 9f 19) 777-6010 32 Email: jthomas@jthomasengineering.com Certification Statement: I certify, underpenalty 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. re Seal Date DRAINAGE AREAS If so, •- .. - • Is all/part of this project subject to previous rule - • s FORMS LOADED � Entire Site 4 T pe of SCM 5 Total BUA in pErogLect (sq ft 105565 sf New BUA on subdivided lots (subject to permitting) 6 (sq ft 70275 sf New BUA outside of subdivided lots (subject to 7 ermittin s 35290 sf 8 Offsite - total areas ft sf 9 Offsite BUA (sq ft sf'm 10 Breakdown of new BUA outside subdivided lots: - Parkin s ft - Sidewalks ft 6059 sf Roof Lsq ft - Roadwa s ft 29231 sf - Future s ft - Other, please specify in the comment box below s ft New infiltrating permeable pavement on subdivided 11 lots (sq ft New infiltrating permeable pavement outside of 12 subdivided lots (sq ft Exisitng BUA that will remain (not subject to. 13permitting) s ft 14 Existing BUA that is already s ft ,a 15 permitted Existin BUA that will be removed (sq ft 16 Percent BUA 24% 17 Design storm inches 18 Design volume of SCM cu ft 19 Calculation method for design volume ADDITIONAL INFO_RMAl ION Please use this space to provide any additional information about the 20 drainage area(s): i LMM�� 1 Is project below density thresholds set forth in the applicable stormwater rule? Yes 2 Does project maximize dispersed flow and minimize channelization of flow? Yes 3 Has the use of piping been minimized per .1003(2)(c)? Yes 4 Side slopes of the vegetated conveyances (H:V) 6:1 m5 Maximum velocity in the vegetated conveyances during the 10-year storm? 0.51 6 Are curb outlet swales proposed? Yes 7 Maximum longitudinal slope of curb outlet swale(s) (%) 0% 8 Bottom width of curb outlet swale(s) (feet) 2 ft 9 Maximum side slope of curb outlet swale(s) (H:V) 6:1 10 Minimum length of curb outlet swale(s) (feet) 100 ft 11 Are treatment swales used instead of curb outlet swales? No 12 Is stormwater released at the edge of the setback as dispersed flow? Yes 13 Have stormwater outlets been designed to prevent downslope erosion? Yes 14 Are variations to rule A 003 proposed? No ITIONAL INFORMATION 15 I Please use this space to provide any additional information about this low VEGETATIVE SWALES HAVE BEEN DESIGNED TO PROVIDE DISPURSED FLOW INTO THE WETLANDS. THE SWALES HAVE BEEN DESIGNED AS A 0% SLOPE SWALE WITH NO OUTLET. AS THE SWALE OVERFILLS FROM A 10-YEAR STORM THE WATER WILL SPILL OVER THE LOWER SIDE OF THE SWALE ALONG THE FULL LENGTH OF THE SWALE (100 FT MIN) Swale Drainage BUA Pervious Q Slope Vauow Va=��a� Brea area C Flow depth (ft) # (ac) (cfs) ( /°) (fps) (fps) ac ac 1 1.22 28.30 38103400 0.65 6.04 0.00 1:00 0.54 1:24 2 29.40 36288,00 0,65 5.84 0:00 1.00 0.51 1.22 3 _1.18 0.84 46.00 16869:00 0.65 4.16 0.00 1000 0.47 110 �4. _ 1017 25.80 37774.00 0.65 5.80 0.00 1.00 0,51 1.22 5 7 8 10 11 12 13 14 15 16 17 18 19 20 21 I 22 lilt it IEEE 13113 I'll I