Doing Business with South Carolina Department of Transportation

Roadway Drainage Calculations

Storm Sewer Support Files

Inlet Spacing Charts
These charts aid in spacing catch basins on curbs for applications where only roadway drainage is considered. They also take into account maximum ponding and 100% interception.
Inlet Spacing Charts (PDF 1.96 Mb)

Alternate Pipe - Consultants - Spreadsheet
The alternate pipe spreadsheet for consultants is for inserting drainage design data into the roadway design CADD files.
Alternate Pipe Spreadsheet (XLSX 144 Kb)

GEOPak Drainage

GEOPak Specification Support Manual
The GEOPAK Specification Support Manual explains the step-by-step procedure to complete a storm sewer design utilizing GEOPAK Drainage. All standards and conventions are explained as well as descriptions of output reports to be submitted after the design is complete.
GEOPAK Specification Support Manual (PDF 5.58 Mb)
GEOPAK Drainage for Roadway Design (PDF 1.41 Mb)

Cell Library
The MicroStation cell library was created for use with GEOPAK Drainage. Both MicroStation & GEOPAK (V8 or XM) programs are required to use this file.
Cell Library (Roadway Design)

Drainage Library
The Drainage Library is also used with GEOPAK Drainage. This file references the cell library described above and the .ddb file.
GEOPak Drainage Library (Roadway Design)

Output Files

To create our standard output files for GEOPAK Drainage 2004, you will need the following files. The .drf files are needed to generate the .csv files. This data is copied into the blank EXCEL files that contain the standard information in the preferred format that we require to be submitted after the design is complete. Drainage_report.xls is the macro that you will need for the quantity summary reports. See the GEOPAK Specification Support Manual for a complete explanation of the files and how each is utilized.

The .drf files were generated inside of GEOPAK Drainage 2004 and requires Microstation Windows x86 or newer and Bentley GEOPAK 2004 Edition - Version or newer to operate. GEOPAK Drainage 2004 is a subprogram of Bentley GEOPAK 2004 and cannot function without another subprogram GEOPAK Road 2004. Bentley GEOPAK 2004 runs inside of Microstation V8; therefore, both programs are required.

The EXCEL files were created in Microsoft EXCEL 2000. The macro was written in Visual Basic.

DRF Files
Output DRF Files (ZIP 2.2 Kb)

Blank Excel Files
Area Standard (XLS 19 Kb)
Node Standard (XLS 21 Kb)
Link Standard (XLS 25 Kb)
Node Standard Road (XLS 93 Kb)
Link Standard Road (XLS 64 Kb)

Macro File for Quantities
Drainage Report (XLS 39.5 Kb)

Culvert Support Files

Hydrology Data Sheet for Culverts (<20' Opening)
The spreadsheets below are standard submittals for specific circular culverts and all box and arch culverts. They were written in Microsoft EXCEL 2000.
Hydrology Data Sheet for Culverts (<20' Opening) (PDF Kb)

HY8 Program
The Federal Highway Administration website provides a download for the HY8 culvert design and analysis programs. You can also download the Hydraulic Design of Highway Culverts manual, which is the basis for HY8.
Federal Highway Administration

For additional information or to order, send a written request, including name, address, and payment if required, to:

South Carolina Department of Transportation
Engineering Publication Sales, Room G-19B
Post Office Box 191
Columbia, South Carolina 29202-0191
Telephone: (803)737-4533
Fax: (803)737-4530
Contact Us

Items may be purchased over-the-counter at the Engineering Publication Sales Center, Room G-19B (basement level) in the SCDOT Headquarters Building, 955 Park Street, Columbia, South Carolina.

SCDOT will accept cash, check (make payable to SCDOT), money order (make payable to SCDOT), and credit card (Visa & Mastercard only). Payment must be received before items can be shipped.

Highway Design Manual

The Highway Design Manual assists technicians and engineers in selecting the needed design criteria in preparing plans for SCDOT construction projects.

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