Below is a list of design guideline documents applicable for advanced subsurface wastewater disposal systems in Wake County. 

• Wastewater Disposal System Design Policies (See Section IV of Wake County Regulations)

• Requirements for LPP and pressure manifold design submissions with application for permit

• Checklist for system design submissions

• Pressure manifold design template

• Tap chart template

• Low pressure pipe (LPP) design template

• LPP design template (manual data entry)

• Sample LTAR calculations for varied length line pressure manifolds 

• Friction loss chart

• Flow rate chart for holes drilled in PVC pipe 

• Spreadsheet of flow rate as a function of pressure head and hole diameter in drilled PVC

• LPP pipeline size and volume

• Interceptor drain diagram 

• Diversion swale diagram (conventional drainlines) 

• Diversion swale diagram (LPP drainlines)