Drain Office Permit Guidelines
- 2025 Shiawassee County Storm Water Application – New Window
- 2025 Shiawassee County Storm Water Checklist
- 2025 Shiawassee County Sample Storm Water Permit – New Window
- 2025 Shiawassee County Drain Work Application – New Window
- 2025 Shiawassee County Tap In Application – New WindowNew Window – New Window
- 2025 Shiawassee County Crossing Application – New Window
- Drain Storm Water Management Agreement – New Window
- Guidelines for Storm Water Management – New Window
- Runoff Coefficients for Rational Formula – New Window
- Shiawassee County Storm Water Detention Requirements – New Window
- Conceptual Review Checklist – New Window
- Drainage Plan Checklist – New Window
- Discharge Calculation Spreadsheet – New Window
- Sample Maintenance Agreement example – New Window
- Engineer’s Certificate of Construction – New Window
- Engineer’s Certificate of Outlet – New Window
- Sample Details – New Window
- Sample Outlet Control Structure Detail – New Window
- Board Resolution – New Window *If you are interested in the signed copy, please contact the Clerk’s Office*
