Structure Inventory

To create a new or update a structure inventory in HEC-FIA, follow the tutorial available here. 


Agricultural Data

To add crop data to HEC-FIA, follow the tutorial found available here.


Creating Holdout Area Polygons

Holdout Areas (HOAs) are polygon shapefiles that define where damages reduced at structures are apportioned to reservoirs. While creating your holdout areas, you could draw them based on your Common Computation Point locations (CCPs); however, you might not need them all especially if they are close together. If they are too close together, the flow hydrographs may not attenuate too much between them so it may be better to reduce the number of CCPs and have larger holdout areas. 

  1. Open ArcGIS Pro (or preferred GIS software)
  2. Start by selecting your study Area, right-clicking and then exporting as a new shapefile called HoldoutAreas
  3. Determine your breakpoints. This could be based on your CCPs or something more simple. Things to consider:
    • Split where new reservoir flows will enter the system - 
    • Keeping storage areas or tightly populated areas intact
    • Splitting where routing attenuates more
  4. For this model, you can see that there are 12 CCPs but we will only be giving it 3 Holdout Areas.
    • Area 1 (red) - Mathews Canyon Dam to the junction of Pine Canyon Wash and Clover Creek
    • Area 2(green) - Pine Canyon Dam to Clover Creek
    • Area 3 ( blue) - Junction of Pine Canyon Wash and Clover Creek to the model outlet
      Original Common Computation Points

  5. Select the HoldoutAreas shapefile, select the Edit tab and then Modify. Select the Split feature. Each holdout area will have it's own unique polygon.
    Holdout Areas


  6. Next, each area needs a name. Each holdout area must contain only ONE CCP. If you have a complex model with a lot of CCPs, refer to Reducing the number of your Common Computation Points for tips on how you could start reducing the number of CCPs needed.
  7. After you have reduced the number of CCPs so that the number of CCPs equal the number of holdouts (within only one CCP falling into each holdout area), right-click on the HoldoutAreas select Join and Relates - Add Spatial Join. Your target feature would be HoldoutAreas, the Join Feature would be Computation_Points. 
    Holdout Area Spatial Processing
  8. Save your edits.

Shapefile Processing

Reservoirs Shapefile

  1. Open the attribute table for your reservoir pool shapefile that was exported from HEC-ResSim. It will most likely be <Dam Nam> Pool. (i.e. Mathews_Canyon Pool)
  2. Launch DSSVue and open your forecast.dss and look for the Flow-Holdout timeseries for each dam. You will want the names in DSS to match the names in your attribute table. 
    DSSVue Window

  3. In ArcGIS Pro, edit the names in the reservoir attribute table to remove "Pool".

Rivers

Depending on your source for your rivers shapefile, the extent of your River shapefile may not match the extent of your HEC-FIA model. In ArcGIS Pro, delete streams that are not within the study area and use Split to break off and delete any portions of the rivers that are outside of the study area.

Storage Areas

If you have any levees, the without levee compute needs to associate the stream name with each storage area. Easiest way to do this would be to use ArcGIS to do a spatial join. You can reduce the number of output fields but at a minimum, you will need the Name, the River, and the Reach.

Cross Sections

If you have one-dimensional hydraulics and you want to use the cross sections, you will need to update that shapefile's attribute table to create a new A part field that concatenates the river and the reach.