Outlet protection / riprap aprons
Outlet protection sized from the 8.06 design figures
Give it the pipe and the discharge; the workbench reads the Appendix 8.06 design figures the way a reviewer would — placing your outlet in its Figure 8.06c zone, pulling apron dimensions and stone size from the 8.06d table, and citing the exact figure on the sheet.
What the workbench does
- Design discharge per Appendix 8.03 (Rational Method) or entered directly
- Outlet velocity from full-flow pipe hydraulics (Manning, 1.49 ft⅓/s) with an open-pipe check
- Figure 8.06c zone classification from velocity and discharge
- Apron length, width, and riprap class from the Figure 8.06d sizing table
- Practice 6.41 criteria checks, with multiple outlets per project — each on its own sheet
Sources it answers to
NC E&SC Manual, Practice 6.41 — Outlet Stabilization Structure
apron criteria
NC E&SC Manual, Appendix 8.06 — Design of Riprap Outlet Protection
Figure 8.06c zones + 8.06d sizing table
What you walk away with
Output- Apron plan dimensions and stone size in one results strip
- Figure citations for the exact chart and zone used
- Submittal-ready calc-sheet PDF
Explore the other modules: Skimmer basin design · Swale (grass-lined channel)