Volume II — Design Standards and Requirements

Figure II-1.1. Flow Chart for Determining Type of Drainage Review Required.

Figure II-3.1. Example of a Covered, Bermed, and Plumbed Area – Plan View.

Figure II-3.2. Example of a Covered, Bermed, and Plumbed Area – Side View.

Figure II-4.1. Dispersion Trench.

Figure II-4.2. Alternative Dispersion Trench.

Figure II-4.3. Through-Curb Inlet.

Figure II-4.4. Pipe Anchor Detail.

Figure II-4.5. Corrugated Metal Pipe Coupling and/or General Pipe Anchor Assembly.

Figure II-4.6. Debris Barrier (in road right of way).

Figure II-4.7. Gabion Outfall Detail.

Figure II-4.8. Diffuser TEE.

Figure II-4.9. Pipe/Culvert Outfall Discharge Protection.

Figure II-4.10. Concrete End Protection.

Figure II-4.11. Ditches – Common Sections.

Figure II-4.12. Drainage Ditches – Common Sections.

Figure II-4.13. Geometric Elements of Common Sections.

Figure II-4.14. Flow Splitter Option A.

Figure II-4.15. Flow Splitter Option B.

Figure II-4.16. Flow Spreader Option A: Anchored Plate.

Figure II-4.17. Flow Spreader Option B: Concrete Sump Box.

Figure II-4.18. Flow Spreader Option C: Notched Curb Spreader.

Figure II-4.19. Flow Spreader Option D: Through-Curb Port.

Figure II-5.1. Infiltration Feasibility Flow Chart.

Figure II-5.2. Runoff Treatment BMP Selection Flow Chart.

Figure II-8.1. Critical Drainage Areas Commissioner District 1.

Figure II-8.2. Critical Drainage Areas Commissioner District 2.

Figure II-8.3. Critical Drainage Areas Commissioner District 3.

Table II-1.1. Drainage Requirements that Must Be Evaluated for Each Type of Drainage Review.

Table II-1.2. Example Permits or Approvals that May Be Required by Other Agencies.

Table II-1.3. Summary of Submittal Requirements for Each Review Stage and Type of Drainage Review.

Table II-4.1. Allowable Structures and Pipe Sizes.

Table II-4.2. Maximum Cover (feet) for Concrete Pipe-Compaction Design A.

Table II-4.3. Maximum Pipe Slopes and Velocities.

Table II-4.4. Rock Protection at Outfalls.

Table II-4.5. Channel Protection.

Table II-5.1. Summary of Minimum Dispersion Flow Path Area and Length Requirements.

Table II-5.2. Minimum Horizontal Setback Requirements between Stormwater BMPs and Onsite Sewage System (OSS) Components.

Table II-5.3. Minimum Horizontal Setback Requirements Between Stormwater BMPs and Private/Public Wells.

Table II-5.4. Summary of Minimum Investigation and Testing Requirements for Shallow Infiltration BMPs, Steps 2, 3, and 5.a

Table II-5.5. Minimum Measured Infiltration Rates.

Table II-5.6. Post Construction Soil Quality and Depth Applicability.

Table II-5.7. Preserving Native Vegetation Applicability.

Table II-5.8. Dispersion Applicability.

Table II-5.9. Rain Gardens Applicability.

Table II-5.10. Bioretention Cells, Swales, and Planter Boxes Applicability.

Table II-5.11. Perforated Stub-Out Connection Applicability.

Table II-5.12. Permeable Pavement Applicability.a

Table II-5.13. Tree Retention and Tree Planting Applicability.

Table II-5.14. Vegetated Roofs Applicability.

Table II-5.15. Reverse Slope Sidewalks Applicability.

Table II-5.16. Minimal Excavation Foundation Applicability.

Table II-5.17. Rainwater Harvesting Applicability.

Table II-5.18. Infiltration Basins Applicability.a

Table II-5.19. Infiltration Trenches Applicability.a

Table II-5.20. Drywell Applicability.a

Table II-5.21. CAVFS Applicability.

Table II-5.22. Sand Filter BMPs Applicability.

Table II-5.23. MFD Applicability.

Table II-5.24. Vegetated Filter Strip Applicability.

Table II-5.25. Wetpond Applicability.

Table II-5.26. Wetvault Applicability.

Table II-5.27. Stormwater Treatment Wetland Applicability.

Table II-5.28. Oil/Water Separator Applicability.

Table II-5.29. Detention Pond Applicability.

Table II-5.30. Detention Tank Applicability.

Table II-5.31. Detention Vault Applicability.

Table II-5.32. Combined Detention and Wetpool BMP Applicability.