FLOOD01888

• County: Statewide
• Title: River Hydraulics
• Date: 10/15/1993
• Prepared By: US Army Corps of Engineers
• Floodplain - Doc Type: Educational/Technical/Reference Information

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Figura 5-8. Disruption of the stage profile of the illinois River by Inflow from the Fox
River

f. Assemble cross section file. On the basis of the
schematic diagram, prepare the geometric data me. See
Appendix D.

g. Identify a calibration event. Choose a time period
that includes one of the largest events of record. The
period should also include low flow and should contain
the maximum amount of stage data.

h. Assemble boundary condition file. From the
gaging table and the schematic diagram, assemble the
boundary condition file locating all point and uniform
lateral inflows in their proper locations.

i. Calibration. Calibrate the data to reproduce the
calibration event.

j. Verification. Verify the simulation using other
periods and events in the record. Minor adjustments 10
the parameters are acceptable, but no major changes
should be needed. If the reproduction is inadequate,
alternpt to identify why.

5-8. Accuracy of Observed Data

All observed data are subject to measurement error.
Both the operation and calibration of an unsteady flow
model are based primarily on flow and stage data from
gaging stations. Some statinns have better records than
others. It is the management of the error which results
in the quality and consistency of the model. Consistency
is the ability to reproduce multiple events with a single
calibrated data set.

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