Details:

Creators:
McEnroe, Bruce M. ; Gonzalez, Scott A.
McEnroe, Bruce M. ; Gonzalez, Scott A. Less -
Corporate Creators:
K-TRAN (Research program)
Subject/TRT Terms:
[+]
Culvert Culvert Inlets Culvert Outlets Culvert Pipe Design Detention Basins Discharge Drainage Storage And Topography Topography
Publication/ Report Number:
K-TRAN: KU-04-3R
Resource Type:
Tech Report
Edition:
Revised Final Report; July 2003 ¿ April 2005
Corporate Publisher:
Kansas. Dept. of Transportation. Bureau of Materials & Research
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.


Format:
PDF
Funding:
C1409
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:8880dd96482337f9e6a85ff9f15d0718508ee618dd0bcdb358824e509ae0c25e
Download URL:
https://rosap.ntl.bts.gov/view/dot/16194/dot_16194_DS1.pdf
File Type:

Supporting Files

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