ROADWAY-HYDRAULICS COORDINATION GUIDELINE

• Part of the standard NCDOT folder structure. On older TIP projects and if do not exist, can be requested to be added to the current TIP folder structure.
• When a new TIP folder is created, an empty [TIP]_HYD_DRN.DGN file will be placed automatically in the DRAINAGE folder.
• When drainage design is completed, the [TIP]_HYD_DRN.DGN file will be replaced by Hydro.
• Roadway will not copy the DRN to their folders but will reference the [TIP]_HYD_DRN.DGN file from the DRAINAGE folder. Revisions to the [TIP]_HYD_DRN.DGN file will be made in the DRAINAGE folder by both Units.
• Roadway will include the \DRAINAGE\ [TIP]_HYD_DRN.DGN file when creating the project IPS files.

For further details, See Ditch Drafting Guideline.

Lateral and Berm Ditches

• The DDE criteria has been revised to draw ditches into the plan view automatically at the same time cross sections are processed.
• Lateral drainage ditches and berm ditches (with typical geometry) will be placed by Roadway in the \DRAINAGE\ [TIP]_HYD_DRN.DGN file. On some Hydraulic electronic files, if these ditches have been drafted by Hydro and they are on Hydro's "draft" levels, then Roadway will rerun DDE Criteria to check, and if necessary, re-locate the limits of the ditch. Roadway will place place the ditches on levels "Prop Drainage Ditch Base Lines" and "Prop Drainage Ditch Boundaries" and can turn off the Hydro "draft" levels when plotting.
• Roadway will provide DDE quantities for lateral ditches.

Meandering Ditches

• Natural stream design (meandering ditches) cross sections will be created by Hydro in a new cross section file (or added to a copy of Roadway's cross sections.) The COGO chain data will be made available to Roadway for merging into the RDY GPK file.

Berm Ditches

• Hydro will provide a COGO profile for berm ditches that do not follow natural downhill contours.
• When necessary, Roadway will add the back slope stake of berm ditches to the DRN file for setting ROW limits.
• Roadway CADD support has developed berm ditch criteria to automate these processes.

Head/Tail Ditches

• Hydro will make sure head and tail ditches are drawn to scale and cut cross sections when necessary. DDE as well as rip rap quantities should also be computed by the Hydraulic Unit for this type of ditches.
• Hydro will place these ditches on the proposed Hydraulic levels.
• Also known as outlet ditches or ditches at outlet pipes, because they are perpendicular to the roadway (instead of "lateral" [ditches].

• Roadway will continue to provide preliminary structure designs and approach slabs in the \Proj\[TIP]_RDY_DSN.DGN file.
• Hydraulics will provide preliminary structure designs for structures over water only in the\DRAINAGE\ [TIP]_HYD_DRN.DGN file.
• Post Hydraulic phase, if necessary, Roadway will adjust the structure and approach slabs limits according to what is in the \DRAINAGE\ [TIP]_HYD_DRN.DGN file in the \Proj\[TIP]_RDY_DSN.DGN file.
• For Roadway plots, preliminary structures designs duplicate levels in the \DRAINAGE\ [TIP]_HYD_DRN.DGN file can be turned off.
• Limits of the bridge end bents , and if proposing rip rap quantities, will be provided by Hydraulics.
• Hydraulics will only locate and place around bridge end bents the appropriate slope stake lines in the \DRAINAGE\ [TIP]_HYD_DRN.DGN file. Roadway will connect the rest of the slope stake lines for the entire project to these construction limits lines in the \Proj\[TIP]_RDY_SS.DGN file.
• Grade to drain limits for areas around bridges will be provided by Hydraulics (on plans and cross sections).

• Ditch details will be placed, stationed, and numbered (or lettered) by Hydro, but can be shifted anywhere on the plan sheet by Roadway, or moved to a separate ditch detail sheet by Roadway, which will reside in the DRN file.
• Hydro will place all details on a "ditch detail" level as specified in the Leveling chart.
• On larger TIP projects and to avoid clutter on plans, ditch details can be placed on the Hydraulic Ditch Detail, 2-series, sheet.

• To include buffer zones (1&2) in the final plans, Correct levels of the DRN file should be turned on within the project IPS files.
• CAMA information, Wetland and Stream Impacts, Buffer Impacts, and All permit related legends and such will be put on their respective levels. It may be necessary for Roadway to adjust the IPS files for these additional levels and turn them off.
• Standard Hydraulic profile design location has not been established.
• Standard Hydraulic cross section design location has not been established.