A step-backwater hydraulic model was developed and calibrated to field Were measured using standard discharge-measurement procedures and a Price AA cup Summary of the general site information is found in Table 1.Ĭross-section data were collected using a chart-recording echo sounder with the July 1997 it was observed that riprap was used to fill scour at the right wingwall. Officials to temporarily close the bridge until riprap was placed to protect the bridge. OnĪpril 9, 1997, a portion of the right embankment slumped, forcing the Swift Country Progressively deepened from 14.8 ft on Apto 19.5 feet on April 9, 1997. Right abutment was primarily slack and reverse flow. During the Apvisit the flow from the rightįloodplain was so strong that a standing wave formed upstream of the bridge where theįloodplain and main channel flow began mixing. The flow separated from the rightĮmbankment, nearly perpendicular to the main channel flow, and joined the main flow Flow was towards the mainĬhannel along the entire length of the embankment. Location of flow reattachment along the right embankment. The field crew searched for but could not define a ThisĬoncentration of flow in the right floodplain is likely caused by the sinuous channelĪlignment upstream of the bridge. The bridge face during each site visit show a progression of scour at the right abutment.ĭuring all three visits the floodplain flow was concentrated in the right floodplain. July 15, 1997) and collected real-time bridge-scour data. USGS visited this site three times (an additional site visit was made during low-flow on During the upper Midwestern flooding in April 1997, the The site is located in a rural / agricultural areaĪnd is 18 miles upstream of the US Geological Survey (USGS) Appleton streamflow. Swift County Road 22 over the Pomme De Terre River is a three-span structure Pomme de Terre River at County Route 22 near Fairfield, Minnesota Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages. Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book.
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