Modeling Scope

The table below shows the scope of the modeling required to accurate determine the best design for the new crossing and what techniques of armoring should be applied to the current crossing.


Item B: Modeling
All software that will develop an understanding for the low water crossing and surrounding environment are categorized as modeling. The multiple software that will be used are to develop certainty in design alternatives.


The hydrologic Engineering Centers River Analysis System (HEC-RAS) is a modeling software that will perform the following procedures:

  • One-dimensional steady flow calculations
  • Unsteady flow calculations
  • Sediment transport
  • Water temperature modeling.


This modeling software was developed by the Army Corps of Engineers to manage natural water channels. This system will be used to manage the up-stream channel reach of the low water crossing as well as the effect of stream changes due to maintenance and excavation. This modeling relies on the completion of the channel reach surveying. All surveying data will be used to create the cross sections of the stream reach.


USGS Data:
The U.S. Geological Survey (USGS) data will be used to estimate the stream flow. The data from USGS will give the team the following:

  • Maximum and minimum daily discharge
  • Stream gage measurements to analyze the stream flow
  • How stream flow fluctuates throughout the year
  • What influence each year-storm has on the discharge


The USGS data is necessary to estimate flood magnitude and to expect the time of the flood. The team will use the stream flow data to determine possible overtopping caused by a flood. The USGS data will also help determine certain physical feature of the area, such as the fault line that coincides with Oak Creek River.


Land Survey:
The land surrounding the project site and the river will be surveyed to document the change in elevation within the river and around the crossing. This data will help with the following:

  • Elevation changes of area
  • Cross-sectional area of the river
  • River’s slopes