Morrisville UDO Administrative Manual - February 2020

Part 4 Appendices Checklists

Net Total Façade Wall Area1 ______________ sf [1] Net Total Façade Wall Area is the Area of Façade Walls minus Area of Window and Doors

Area of predominant net façade material ____________ sf ____________% Area of non-predominant net façade material ____________ sf ____________%

13 Location and dimensions of proposed dumpster, recycling container, and/or trash compactor(s) Q Stormwater Report 1 Runoff Calculations report for all proposed storm drainage structures including, but not limited to culverts, storm drain systems, inlets, ditches, open channels, BMPs, outlet protection, etc. The report shall be sealed and signed by a registered North Carolina Professional Engineer. 2 Narrative description of Existing Conditions, Natural Resource Inventory, Stormwater Management Plan, calculations (methods, variables, assumptions, etc.) and results. 3 Hardcopy & .xls file of completed Storm-EZ form 4 Maps

• Pre- and Post-Development Drainage Area Maps (on full-size plan sheet) • BMP drainage area map (include area of BMP itself) (on full-size plan sheet) • Inlet drainage area map (on full-size plan sheet) • USGS Quad map (identify site) • FIRM map (identify site) • Wake County Soil Survey (1970) map (identify site) 5 Runoff coefficient calculations

• Rational Formula (up to 5 acres) • SCS Method (discrete CN method)

6

Time of concentration for pre/post development conditions

7 Analyze pre-development and post-development runoff conditions for each discharge point from the site 8 No net increase from pre-development peak flow for 1-yr, 2-yr, & 10-yr, 24-hr storm events 9 Roof drain & leader calculations (designed per the NC Plumbing Code) 10 Storm Drain System Design Calculations • Pipe material – RCP, minimum pipe diameter of 15 inches, minimum slope of 0.5% • Pipes carry the 2-yr storm at a velocity of at least 2 • 10-yr (contained in pipe) & 25-yr (contained in structures) HGL calculations & profiles • Swale calculations showing non-erosive flow for 10-yr storm • Gutter spread calculations for 4 in/hr storm (8ft max spread) • Culvert calculations (energy equation & nomographs) • Rip rap apron calculations/nomographs 12 Stormwater Quality (85% TSS removal)/Quantity Best Management Practices (BMPs) • Stormwater BMPs must be designed in accordance with the NCDENR Stormwater BMP Design Manual, or the Minimum Design Criteria (MDC), and any supplements to it issued by the Town of Morrisville including the Town of Morrisville EDCM and Policy or Technical Memorandums, • Stormwater BMP detention routing (1, 2, 10, 25, and 100-year storm events) • Provide 1 foot of freeboard from the top of any dam embankment during the 100-year storm event • Permanently stabilized emergency spillway must be provided • Water Quality Computations and BMP sizing/drawdown for the 1-inch (1”) runoff depth 13 Nutrient Calculations: Copy (of all tabs) & .xls file of completed J/F Nutrient Loading Accounting Tool 14 BMP Operation and Maintenance manual • Engineers estimate for BMP. Provide detailed, line-item bid summary with item/activity description, unit price, amounts of units, and total cost. • Maintenance surety calculation (30% cash payment) • Draft O&M agreement with site-specific data included for review prior to execution and recordation R Other 1 Keynotes are not permitted

September 13, 2019

Morrisville, NC

Page 4-38

Administrative Manual