The INDOT Hydraulics section designs or reviews all waterway projects including, but not limited to, bridges, culverts, storm sewers, and detention ponds along state roads, U.S. routes or interstates or local projects built with state or federal funds.  


Hydraulic Department Project List

INDOT hydraulics is in the process of working on a live embedded worksheet to show the status of projects for consultants and districts.  For the time being, we have created a PDF of the list of projects which will be updated on a weekly basis on Mondays with exception being on holidays in which they will be updated the following day.

Pipe Lining Design

Pipe lining is a technique for maintaining existing corrugated metal pipes in which a smooth walled structure is installed within the exisiting pipe and grouted into place.  This practice does remove water way area, but the roughness factor is reduced.  Projects are analyzed to meet or better existing conditions and appropriate scour protection is installed to further protect the embankments for the typically higher velocities.

Another way for maintenance to prolong the life of a pipe is by paving the invert of the pipe.  This process lines the floor of the exisiting pipe with approximately a five inch thick smooth concrete flooring.  This application is useful if the floor of the pipe is deteriorating while the walls and top of the pipe are in satisfactory condition.

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Developing Design Guidance

The following list contains design guidance that may not be reflected in the Indiana Design Manual (IDM).

  • The invert of a jack and bored pipes will be set to a minimum of 1 ft above the invert of the existing pipe to be lined.  If this is not feasible due to site constraints, please coordinate with the Office of Hydraulics.
  • All liner options should have the inverts of the pipes raised by the liner thickness.  Backwater should then be calculated by taking the existing culvert's backwater and subtract the difference of the headwaters.
  • HY-8 v.7.2 is currently the only version permitted for use by the INDOT Office of Hydraulics.  The link to upload the software is on the Active Design Memoranda page under number 16-34.
  • Jack and bore pipes as part of a culvert liner project under the interstate are required to have a minimum inner diameter of 18 inches.
  • For consistency of sump requirements and without more detailed information, if the soil map unit description contains the word sand, the required sump from IDM Fig 203-2E should be based off of the "Sump Required for Stream Bed of Sand" column.
  • Reinforced concrete boxes and 3 sided structures under 18 foot span should incorporate corner haunches as produced by the manufacturer.  The spreadsheet provided below, named Specialty Structure Coordinate Generator under Other Links and Forms, includes the haunch data from the manufacturers. 

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Sample Documents

The following sample documentation are examples of what we at the Office of Hydraulics would like to receive from consultants. The format of the reports should follow IDM Chapter 203.

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Submitting Documents

Documents should be submitted using ERMS and emailing the appropriate INDOT Coordinator.   Please allow for up to 45 days for all reviews and designs for each submittal and 14 days for any permit application.

Starting July 1, 2018, design submittals for small structures and scour review will require the respective memo template below to be filled out  and submitted along with the hydraulic report, design files, and QA form. There is an instruction sheet for each template

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Prequalification to Submit Driveway Permits

INDOT Hydraulics has launched a Driveway Permit Training Course.  It is a course that we have developed for consultants that are submitting driveway permits that include drainage design that drains to the INDOT right-of-way.  We will be requiring that the course be completed for a consultant to become prequalified for this type of work.  In August of 2018, we will no longer review drainage design submittals for driveway permits from consultants that are not prequalified.

If you would like to be signed up for the course please send your first and last name as well as your email address to Hydraulics@indot.IN.gov 

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Small Structure and Culvert Designs Training Course

INDOT Hydraulics has launched a Small Structure and Pipe Hydraulics Training Course.  It is a course that we have developed for consultants that are submitting small structure and culvert designs.

If you would like to be signed up for the course please send your first and last name as well as your email address to Hydraulics@indot.IN.gov 

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Upcoming Training

Training Date PDH Host Location Registration Form

There is no training at this time


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Related Links and Documents

Design Guidance

Hydrology Links

Other Links and Forms

These spreadsheets are intended as tools to provide convenience in hydraulic design.  There is no guarantee, either implied or explicit, as to the accuracy or reliability of the results provided by these spreadsheets.  By using any of these spreadsheets, the user agrees to take full responsibility for the input data and for the interpretation and use of the spreadsheet results.

Past Presentations

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Frequently Asked Questions

  • When doing a bridge scour analysis, should I take the depth from the downstream invert or upstream invert?
    • When doing a bridge scour analysis, the scour depth should be taken from the lowest invert elevation, whether it is upstream or downstream.
  • What kind of inlet type should I choose when lining a pipe?
    • When initially lining a pipe with CIPP, the inlet configuration should match whatever is in the field, unless the existing pipe is projecting. In which case, the liner should have an inlet configuration of mitered to conform to slope. 
    • When initially lining a pipe with HDPE liner, the inlet configuration should have an inlet configuration of mitered to conform to slope even if the existing pipe has a headwall. If a headwall or bevel edge is needed for the HDPE liner to perform correctly, it will need to be constructed with the project.
    •  If you are putting in a 5" paved invert, the inlet configuration should simply match the existing configuration.  If you need to improve the inlet configuration, then adding a headwall or a headwall with bevel edge is acceptable with the proposal.
  • HY-8 v.7.2 does not allow me to perform culvert analysis with reverse slope pipes. What should I do when the existing pipe has the inlet lower than the outlet?
    • If the existing pipe has a reverse slope, we recommend bringing the inlet invert to the elevation of the outlet creating a flat pipe.  
  • What type of inlet configuration do I use for a pipe end section? (metal, grated box, etc.)
    • Inlet configurations for the pipe end sections: grated box types I and II, metal end sections, precast concrete, and safety metal culvert end sections for smooth pipes is recommended to have a the inlet configurations similar to that of a headwall.
  • What region of the Huff Distribution Curve does my project correspond to?
    • The 50% Huff Distribution Curves have been set in four locations within the state of Indiana.  For consistency purposes, this map - Huff Distribution Regions - shows which county belongs to which region.
  • Which quartile of the Huff Distribution Curve do I use for hydraulic analysis?
    • According to the LTAP Stormwater Drainage Manual, the first quartile is set for any storm duration less than or equal to 6 hours.  The second quartile is set for any storm duration greater than 6 hours and up to and including a 12-hour storm.  The third quartile is for storms greater than 12 hours and up to and including a 24-hour storm.  The fourth quartile is for any storm greater than 24 hours.
  • How do I determine if a bridge is scour critical?
    • A bridge is scour critical if it meets one of the following three conditions:
      • The low scour elevation is below the low footer elevation when not on piles.
      • The low scour elevation is within 10 feet of the critical pile elevation (see below).
      • There are no records of elevations of the foundational supports.
  • How should I determine the existing pile tip elevations?

    • When looking for pile records, it is recommended to check with the INDOT records department by filling out the online form located here:  https://entapps.indot.in.gov/OPSM/Dashboard/UserRequest     and making sure that pile driving records are identified as the need in the comments area.  If the as built plans are not available from the INDOT records department, check with the district for as built pile driving plans.  If as built plans cannot be located, the plan estimated quantities may be used to determine estimated pile lengths by dividing the planned individual pile lengths in half (as a factor of safety), report this elevation as the estimated pile tip elevation.  The computed low scour depth should be at least 10 feet higher than the estimated or as built pile tip elevation in order for the existing structure to not be considered scour critical.

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Contact Information

Mark Bailey
Office of Hydraulics Manager
Indiana Department of Transportation
100 N. Senate Ave., IGCN 642
Indianapolis, IN 46204

Stay current on INDOT Hydraulics design guiance and policy changes by subscibing to the INDOT Hydraulics Listserv.