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Analysis of INDOT current hydraulic policies.

File Language:
English


Details

  • Alternative Title:
    Joint Transportation Research Program : Civil Engineering
  • Creators:
  • Corporate Creators:
    Purdue University. Joint Transportation Research Program
  • Corporate Contributors:
  • Subject/TRT Terms:
  • Publication/ Report Number:
    FHWA/IN/JTRP-2011/14
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Indiana
  • Edition:
    Final report.
  • Corporate Publisher:
    Purdue University. Joint Transportation Research Program
  • Abstract:
    Hydraulic design often tends to be on a conservative side for safety reasons. Hydraulic structures are

    typically oversized with the goal being reduced future maintenance costs, and to reduce the risk of

    property owner complaints. This approach leads to a conservative design with higher construction

    costs. Therefore, there is a need to quantify the cost-benefit aspect of this conservative approach.

    Accordingly, the overall objective of this project is to compare hydraulic design policies of Indiana

    Department of Transportation (INDOT) with that of other states, and perform cost-benefit analysis of

    large versus smaller hydraulic structures in terms of capital and maintenance costs. Comparison of

    INDOT’s culvert design is similar to that of Michigan, and is most updated compared to Ohio, Illinois

    and Kentucky. INDOT uses Q100 as the design discharge, which is conservative compared to other

    neighboring states that use Q50 as the design discharge for designing culverts. By using the data from 16

    culvert design examples including both new-alignment and replacement structures, cost benefit analysis

    is performed in the light of suggested revision in culvert hydraulics policy. Results show that an

    increase in backwater limit to 1’ will result in 44% reduction in culvert size (represented as culvert area)

    with an average backwater of 0.79’. Increase in backwater limit will also increase the outlet velocity by

    72% that may result into extra cost in outlet protection structures. Depending on the type and the size of

    the culvert, a change in hydraulic policy may result in saving from 12 -58% of the original cost

    associated with the current conservative design.

  • Format:
    PDF
  • Funding:
    SPR-3405
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:32e6a53b7019729ba89396dde883e42b832b7446b5beb4aa1152cd4bf2fbaf85cb1bba21354714b817403b5100e78798e8786728e4bd2a8630693348b9694e6f
  • Download URL:
  • File Type:
    Filetype[PDF - 2.98 MB ]
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