For older versions of the Drainage Manual, please contact Central Office

 Document Name Description Date
RDB24-04.pdfJanuary 2025 Roadway Design Bulletin - 2025 Drainage Manual11/1/24
DrainageManual2025.pdfJanuary 2025 Drainage Manual 11/1/24
RDB23-03.pdfJanuary 2024 Roadway Design Bulletin - 2024 Drainage Manual10/30/23
DrainageManual2024.pdfJanuary 2024 Drainage Manual 
10/30/23
RDB22-05.pdfJanuary 2023 Roadway Design Bulletin - 2023 Drainage Manual10/27/22
DrainageManual2023.pdfJanuary 2023 Drainage Manual 10/27/22
RDB21-12January 2022 Manual Revision Bulletin10/27/21
DrainageManual2022January2022 Drainage Manual10/27/21
RDB20-11January 2021 Manual Revision Bulletin10/30/20
DrainageManual2021January 2021 Drainage Manual10/30/20
2020JanManualRevisionJanuary 2020 Manual Revision Bulletin10/30/19
2020DrainageManual.pdfJanuary 2020 Drainage Manual10/30/19
2019Jan-DMRevLog.pdfJanuary 2019 Drainage Manual Revision Log11/01/18
2019DrainageManual.pdfJanuary 2019 Drainage Manual11/01/18
 2018Jan-DMTransmittal.pdfJanuary 2018 Drainage Manual Revision Transmittal11/01/17
2018JanDrainageManual.pdfJanuary 2018 Drainage Manual11/01/17
2017Jan-DMTransmittal.pdfJanuary 2017 Drainage Manual Revision Transmittal11/02/16
2017Jan-DrainageManual.pdfJanuary 2017 Drainage Manual 11/2/16
2016Jan-DMTransmittal.pdfJanuary 2016 Drainage Manual Revision Transmittal12/10/15
2016Jan-DrainageManual.pdfJanuary 2016 Drainage Manual12/10/15