Rocky Mountain Research Station Logo USDA Forest Service
Rocky Mountain Research Station
Forestry Sciences Laboratory - Moscow, Idaho
Moscow Personnel  |  Site Index  |  Site Map  |  Moscow Home
Project Information  |  Modeling Software  |  Library  |  Project Photos  |  Offsite Links  |  Eng. Home

Soil & Water
Engineering Publications


Project Leader:
William J. Elliot
email Bill

Contact Webmaster
email webmaster

Database updated
29 days ago

Sediment concentration and turbidity changes during culvert removals

Foltz, R.B.; Yanosek, Y.A.; Brown, T.M. 2008. Sediment concentration and turbidity changes during culvert removals. Journal of Environmental Management 87(3):329-340. May 2008.

Keywords: Soil erosion; Road obliteration; Sediment; Stream water quality; Culvert removal; sediment concentration

Links: pdf PDF (505 K)

Available to purchase: PDF (536 KB) [Elsevier subscription]

Abstract: The concentrations of sediment and turbidity in stream water were monitored during culvert removals to determine the short term effects of road obliteration. Sediment concentration was measured at 11 stream crossings among two locations in Idaho and one in Washington. Sediment concentration immediately below the culvert outlet exceeded levels above the culvert outlet by at least three orders of magnitude at all stream crossings. Sediment yields ranged from 170 to less than 1 kg in the 24-h period following culvert removal. Turbidity exceeded the regulatory limits during culvert removal at all locations monitored in this study and remained above the limits beyond the monitoring periods of 24 h at four of the locations. Sediment concentrations 100m downstream of the culvert outlet were reduced by an order of magnitude, but did not change the turbidity values sufficiently to meet regulatory limits. Sediment concentrations an average of 810m downstream of the culvert outlet were similar to sediment concentrations above the culvert for the entire excavation period and turbidity regulations were met. Mitigation consisting of two straw bales placed in the stream caused a significant reduction in sediment yield from an average of 67 kg to an average of 1.6 kg.

Moscow FSL publication no. 2008i