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Storage effects at culverts
  • Published Date:
    2006-05-01
  • Language:
    English
Filetype[PDF-869.45 KB]


Details:
  • Corporate Creators:
  • Publication/ Report Number:
    K-TRAN: KU-04-3R
  • Resource Type:
  • TRIS Online Accession Number:
    1019588
  • Edition:
    Revised Final Report; July 2003 ¿ April 2005
  • NTL Classification:
    NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures ; NTL-HIGHWAY/ROAD TRANSPORTATION-HIGHWAY/ROAD TRANSPORTATION ;
  • Format:
  • Abstract:
    Temporary ponding of water on the upstream side of a culvert serves to reduce the peak discharge that the culvert

    must convey. In most cases the discharge reduction resulting from detention storage is minor and can be neglected in

    design. However, in some cases the storage effect is substantial, and accounting for it may result in a more economical

    design.

    This report presents new methods for quickly estimating the effects of detention storage on the performance of

    existing culverts and the sizing of new culverts. These methods, which do not require hydrograph routing, are

    applicable to pipe and box culverts operating under inlet control with no overtopping of the roadway. Peak discharges

    can be computed by the Rational method, USGS regression equations or any other appropriate method. Water-surface

    areas at two or more stages are needed to define an approximate depth-area relationship. The required areas can be

    estimated from existing topographic maps or measured in the field by one person with a rotating laser level and a GPS

    unit.

    Analyses of seven pipe-culvert sites in Johnson County showed that detention-storage design would reduce the

    required pipe diameter by at least one increment at five of the seven sites, and by two or more increments at three of

    the sites. Similar analyses of ten box-culvert sites showed that detention-storage design would reduce the required

    span by more than 10% at three of the ten sites. Our test results indicate that storage effects are less likely to be

    significant for large culverts than for small culverts.

    The design of a culvert for detention storage rather than peak flow generally requires another survey, extra design

    effort and the purchase of additional right-of-way or a drainage easement for the storage area. Detention-storage

    design is economically justifiable only if cost savings on the culvert exceeds these added costs. In locations where

    storage effects are significant but detention-storage design is not economically justifiable, the culvert should be

    designed for peak flow.

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