View the Bald Eagle basin model by expanding the "Basin Models" folder and selecting "BaldEagle" within the explorer window.
A map of the Bald Eagle HEC-HMS model should appear.
Once the basin model map appears, minimize the "Bald Eagle" basin model tree.
Expand the Meteorologic Models folder and examine the available options. Notice that the "Radar" alternative is set up to run the HEC-HMS model using the raw, gridded precipitation data.
There are additional alternatives listed as well meant to use the modified precipitation that we will be creating throughout the remainder of the workshop.
Let's first examine the results from the raw gridded precipitation input.
Run HEC-HMS (Original Precipitation).
Select the "Run: Sep2018" option from the HEC-HMS Compute Selection menu.
Select the Compute All Elements () icon to compute the Sep2018 model that utilizes the raw, original gridded precipitation data.
View HEC-HMS Results (Original Precipitation).
Right-click on the Outlet element, "Lock Haven SNK" → View Results (Sep2018) → Graph.
You can also select the "Summary Table" option to view quantitative metrics (peak flow, peak timing, volume, etc.) from the simulation.
Question: What is the Peak Flow of the September 2018 event (using the original gridded precipitation) at the Bald Eagle watershed outlet?
The peak flow at Lock Haven SNK was about 20,000 cfs for the September 2018 event when HEC-HMS was run with the original, raw gridded precipitation data.
Now that we've taken a look at the original HEC-HMS model, let's investigate the impacts that manipulating the gridded precipitation data can have on flow conditions within the Bald Eagle watershed.
