Last Modified: 2024-04-20 09:54:53.606

Software Version

HEC-SSP version 2.3 was used to created this example.  You can open the example project with HEC-SSP 2.3 or a newer version.

Objectives

This workshop will evaluate the instantaneous peak flow-frequency curves for the Santa Cruz River near Lochiel, Arizona (USGS station 09480000) and the East Fork Big Creek near Bethany, Missouri (USGS station 06897000).  The data sets have historical information and potential low outliers.  Students will use HEC-SSP to estimate flow-frequency curves.  Adequacy of the default low outlier threshold will be examined for the Santa Cruz River.  For East Fork Big Creek, historical information will be added, and the adequacy of both the default high and low outlier thresholds will be examined.  The following major tasks will serve as an outline for the workshop:

  1. Create a new HEC-SSP project and import data.
  2. Analyze the Santa Cruz River data set and estimate flow-frequency curves using Bulletin 17C methodology.
  3. Analyze the East Fork Big Creek data set and estimate flow-frequency curves using Bulletin 17C methodology.

Spend approximately 15 minutes per task to accomplish Tasks 1 - 3 in the allotted time.  Three additional tasks can be completed, if time allows.

  • Fit several flow-frequency curves to the Santa Cruz River data set using B17B methods and compare against the B17C results.
  • Fit several flow-frequency curves to the East Fork Big Creek data set using B17B methods and compare against the B17C results.
  • Create additional Bulletin 17 analyses for the Beaver River near Beaver, UT and Weber River near Oakley, UT using both Bulletin 17B and Bulletin 17C procedures. Compare and contrast the results.

Continue to Task 1. Create a New Project and Import Data.