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Plymouth Ordinances & Specifications 

Storm Drainage and Sediment Control Ordinance

TABLE OF CONTENTS

List of Figures
List of Tables
Section 1 - Administration
  1. Purpose
  2. Storm Water Control Policy
  3. When Effective
  4. Conflicting Ordinances
  5. Repealer
  6. Compliance with Other Ordinances
  7. Disclaimer of Liability
  8. Corrective Action
  9. Connection to a County Regulated Drain
  10. Permits for Construction in a Floodway
  11. Definitions
Section 2 - Submission and Approval Process
  1. Project Sizes and Types Regulated by Ordinance
  2. Exempt Projects
  3. Legal Drains
  4. Application and Review Procedure
  5. Financial Guarantees
  6. Certifications Required
  7. Changes in Plans
  8. Time to Commence Work
Section 3 - Specifications and Technical Information
  1. Information Requirements
    1. Topographic and Soils Maps
    2. Preliminary Drainage Plan
    3. Valley Cross Section
    4. Site Plan
    5. Final Drainage Plans
    6. Report
    7. Permission to Connect to a Legal Drain
  2. System Design Requirements
  3. Storm Water Retention
    1. Acceptable Retention Methods
    2. Design Criteria
    3. Drainage System Outlet
    4. Retention System Overflow Design
    5. Hard Surface Definition
    6. Determination of Storage Volume
    7. General Retention Basin
         Design Requirements
    8. Dry Bottom Basin Design Requirements
    9. Wet Bottom Basin Design Requirements
    10. Facility Financial Responsibility
    11. Facility Maintenance Responsibility
    12. Inspections
    13. Corrective Measures
    14. Joint Development of Control Systems
    15. Installation of Control Systems
    16. Detention Facilities in Floodplains
    17. Off-Site Drainage Provisions
  4. Determination of Runoff Quantities
  5. Amount of Runoff To Be Accomodated
    1. Minor Drainage Systems
    2. Major Drainage System
  6. Storm Sewer Design Standards
    1. Manning's Equation
    2. Minimum Size
    3. Grade
    4. Alignment
    5. Manholes
    6. Inlets
  7. Workmanship and Materials of Storm Sewers
    1. Workmanship
    2. Materials
    3. Special Hydraulic Structures
  8. Open Channel Design Standards
    1. Manning's Equation
    2. Channel Cross Section and Grade
    3. Side Slopes
    4. Channel Stability
    5. Drainage of Waterways
    6. Establishment of New Regulated Drain
    7. Appurtenant Structures
    8. Disposition of Spoils
  9. Construction and Materials of Open Channels
    1. Construction
    2. Materials
  10. Storm Water Detention
    1. Acceptable Detention Methods
    2. Design Storm
    3. Allowable Release Rate
    4. Drainage System Overflow Design
    5. Determination of Storage Volume
         - Rational Method
    6. Determination of Storage Volume
         - Other Methods
    7. General Detention Basin
         Design Requirements
    8. Dry Bottom Basin Design Requirements
    9. Wet Bottom Basin Design Requirements
    10. Roof Top Storage
    11. Parking Lot Storage
    12. Facility Financial Responsibility
    13. Facility Maintenance Responsibility
    14. Inspections
    15. Corrective Measures
    16. Joint Development of Control Systems
    17. Installation of Control Systems
    18. Detention Facilities in Floodplains
    19. Off-Site Drainage Provisions
  11. Other Requirements
    1. Sump Pumps
    2. Down Spouts
    3. Footing Drains
    4. Basement Floor Drains
CLERK-TREASURER
124 N MICHIGAN ST
PO BOX 492
PLYMOUTH IN 46563
574-936-2124


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