| HBD # | Effective Date | Memorandum Title |
|---|---|---|
| 2019-1 | 09/29/2019 | Type 25 Catch Basin Design Aid |
| 2019-2 | 09/29/2019 | Updated Rainfall Intensity Values |
| 2019-3 | 09/29/2019 | Release of the USGS Scour Manual and Updated Guidance on Bridge Scour Analysis |
| 2019-4 | 09/29/2019 | Updated Hydraulic Bridge Design Criteria |