General Instructions/Information

The purpose of this decision support system:

1. To provide an interactive map depicting stream reaches protected by barriers in the Great Lakes Basin.
2. To show what portions of the river would be accessible to sea lamprey and other fish species if a barrier is removed.
3. To provide tools that show what portions of the river system would be affected if a barrier is added.

Tool Instructions

Select

Select can be used to identify an existing barrier , treatment location , or a virtual barrier created using the "Add Barrier" tool and will show the information available for that feature.

Selecting:

• Existing Barrier - Provides Name, Water Body, Last Inspection Date, Protected Upstream Distance and Overall Upstream Distance for that feature.
• Treatment Point - Provides the Stream Name and treatment Years.
• Virtual Barrier - shows the choices available for that barrier, either Remove This Barrier or Mark As Start Point as well as Lat/Long and Up - or - Downstream Distance after running a trace.

Add Barrier

Used to add a virtual barrier to the map. Virtual barriers must be placed within 150m of a river/stream flow line.

Adding Barriers

1. Zoom in to river or stream in your area of interest (using the zoom tools in the Map Tools toolbar or scroll wheel on mouse).
2. Click on the Add Barrier tool in Barrier Tools and click on the location on the stream to add a virtual barrier to the map.
3. Click on other locations on the flowline to add additional barriers (optional) or skip to step 4. These virtual barriers can also be removed by clicking on them and using the Select Barrier tool and choosing Remove This Barrier.
4. Before the trace can be ran a virtual barrier must be chosen as the start point. The start point determines where the trace will start to calculate the distance and show the areas on the stream affected by adding a barrier at that location. Click on a barrier then choose Mark as Start Point. The virtual barrier selected as the start point will change color.
5. From the Barrier Tools toolbar select Upstream or Downstream for the direction that will be traced.
6. Click on the Run Trace tool to run the model.
7. When the Run Trace process completes the flowline of the barrier will be highlighted and a pop-up box will show the latitude and longitude coordinates of the virtual barrier and the amount of distance affected by the barrier.

Run Trace

Models the distance affected either downstream or upstream by user added virtual barriers.

After using the Add Barrier tool to add barriers and choosing a virtual barrier as a start point, click the Run Trace tool to run the model. A pop-up box will indicate the latitude and longitude coordinates of the virtual barrier and the amount of distance upstream or downstream (based on your selection) affected by adding a barrier to that location.

Clear All Barriers

Clears all virtual barriers

Warning: This step cannot be undone. If you do not want to remove all the virtual barriers then use the Select tool and click on each virtual barrier you want removed individually to choose the Remove this barrier option.

Clear Trace

Clears the existing trace that was created by selecting an existing barrier or a model created using the Run Trace tool.

Tracing Type: Upstream/Downstream

Select Upstream to get the length of the hydrography network in the upstream direction of a modeled barrier or Downstream to get the length of the hydrography network in the downstream direction of a modeled barrier.

Turn On/Off Treatment Layer

Turns the Treatment Layer on or off.

The Treatment Layer provides icons at the mouth of streams that have been treated to reduce sea lamprey populations.