WMS

Using Advanced Data Services Options

By aquaveo on May 22, 2019

In the current versions of GMS, SMS, and WMS, the data service options for importing online maps has changed. It was noted by some of our users that the Advanced option for the Data Services Options dialog was removed.

We are happy to say that the advanced options for the Data Services Options dialog has been restored. The new advanced options are only available when using the Import from Web command in the release of GMS, SMS, and WMS that went out at the beginning of May 2019.

To access the Advanced options from the Data Services Options dialog, click the Advanced button, just as before, to bring up the Select Online Source dialog. This dialog allows users to bring in new data sources for downloading data.

Select Online Source Dialog

Adding new data sources to the Select Online Source dialog can be done in any of three ways:

    Add New Source Dialog
  1. The Select Online Source dialog contains a list of all of the data sources currently available. You can select one of these sources and click the Duplicate Source button to create a copy of the data source. Then, with the copy selected, click the Edit Source button to reach a dialog where you can make modifications to the source such as limiting the layers downloaded from the source or changing the image format downloaded from the source.
  2. You can click the Add New Source button to reach a dialog where you can specify the url of a new data source along with any modifications.
  3. Finally, if you have an Online Source File with the information needed to reach a source, you can click the Add Sources from File to add the source to the available list.

Sources can be deleted from the available list by selecting a source in the list and clicking the Remove Source button. Only sources that have been manually added can be removed or edited.

To get access to the new advanced options for the Data Services Options dialog, visit our downloads page today.

Blog tags: 
GMS
SMS
WMS

Modeling a Dam in GSSHA

By aquaveo on May 1, 2019

Do you have a project that requires modeling a dam, or similar structure, in GSSHA? WMS can make this process smoother with tools designed to help define the structure quickly and efficiently.

In order to create a simulation that includes modeling the dam in WMS and analyzing the dam’s effects using GSSHA, the workflow is as follows:

  1. Import an existing GSSHA base model.
  2. In the GSSHA map coverage, use the Shift key to select the node where you want the dam to be and the node immediately downstream from it.
  3. Right-click on the selected nodes and select Attributes to open a Properties dialog.
  4. Select Output Hydrographs at those nodes.
  5. Run GSSHA.
  6. Using the results from the GSSHA run, size your embankment based on the necessary storage.
  7. Using the Create Feature Arc tool, create an arc to represent your dam.
  8. Double-click on the arc to bring up the Attributes dialog.
  9. Set the type of arc to be an Embankment, then click the ... button next to it to open the Embankment Arc Profile Editor dialog.
    1. Set the PVI Elevation to be the height of the dam.
    2. Click Compute Vertical Curve to compute the Curve Length.
  10. Double-click the node in the stream where your structures will be defined to open the Properties dialog.
  11. Click the button under Hydraulic structures to open the GSSHA Hydraulic Structures dialog.
    1. Add a Detention Basin, Weir and Culvert.
    2. Define the attributes for each of these structures.
  12. Run GSSHA again to see the effects of the dam you have created.
GSSHA Dam Modeled in WMS

If needed, adjust the display options when reviewing the results to get a better idea of how the dam structure affected the results. Try different various options to get a better feel of how the dam affected the simulation results.

Now that you know how to add a dam to GSSHA, try out modeling dam structures and other applications in WMS today!
Blog tags: 
WMS

Modeling a Dam in WMS for Use in HEC-HMS

By aquaveo on April 10, 2019

Do you have a project that requires modeling a dam, or similar structure, in HEC-HMS? WMS can make this process smoother with tools designed to help define the structure quickly and efficiently.

This blog presents a workflow for modeling a dam in WMS to later analyze in HEC-HMS. The workflow is as follows:

  1. Begin with a delineated watershed with attributes defined.
  2. Determine where you would like to place your reservoir and place an outlet point there.
  3. Delineate your watershed and compute basin attributes using your new outlet point.
  4. Create a simulation in HEC-HMS and compare the runoff from the upper basin to the lower basin in order to size your reservoir.
  5. Convert the outlet node to a reservoir.
    1. Switch to Hydrologic Modeling Module.
    2. Using Select outlet tool, select the outlet at the location where you want to model a reservoir.
    3. Right-click and select Add | Reservoir.
  6. Select Calculators | Detention Basins.
  7. Click Define to bring up Storage Capacity Input.
    1. For a dam: Use DEM and enter the height of the desired dam.
    2. Click OK to exit Storage Capacity Input dialog. The Detention Basin Analysis dialog will appear.
    3. Define the storage curve for your reservoir.
    4. Click Map to Hydrologic Model to open Map to Model. Name the series as desired.
  8. Double-click on the reservoir point to open the HMS Properties dialog.
    1. Here, you can choose the storage curve defined earlier, and define all other curves.
    2. To add an orifice to your dam, select Orifice Outlet from the Outlet Type drop-down.
      1. Define the orifice Center Elevation, Cross-sectional Area, and Discharge Coefficient.
    3. To add a spillway, select Broadcrested Spillway or Ogee Spillway from the Spillway Type drop-down.
      1. Define the required characteristics for the selected spillway.
    4. You can also choose to model an overflow type and dam break type if desired.

With the dam, spillway and orifice defined, you can now run your model through HEC-HMS again to see how your reservoir will perform under the selected storm.

Dam analysis in HEC-HMS

Try out modeling dam structures and other applications in WMS today!

Blog tags: 
WMS

Delineating a Floodplain Using a Scatter Point File

By aquaveo on March 20, 2019

Looking for a quick way to delineate a floodplain in your area? WMS provides a way to delineate a floodplain and create a flood impact map quickly, using many different types of data. This blog post will cover how to delineate a floodplain using scatter point data.

Start by opening your scatter point data:

  1. Use the Flood | Read Stage File menu command to import your scatter point dataset. This is the recommended method for importing a scatter point set for using in delineating a floodplain.
Delineating the Floodplain
flood delineation

With the scatter point set imported, now delineate the floodplain.

  1. Select Flood | Delineate menu command.
  2. In the Floodplain Delineation dialog, choose the scatter point set you would like to model from the Select stage scatter point set drop-down menu.
  3. Select the specific dataset you would like to delineate from the Select stage data set drop-down menu.
  4. Set options for the Search radius, Flow path, and/or Quadrants depending on your individual model.
  5. When done with the Floodplain Delineation dialog, the delineation process will begin for the set of water surface elevations selected.

In order to create a flood impact map, it will be necessary to have at least two different delineations using varying datasets. If you wish to go on to create a flood impact map, repeat steps 1-5 with a different dataset to obtain a new floodplain delineation.

Creating a Flood Impact Map

WMS can use two separate floodplain delineations to generate a flood impact coverage. A flood impact coverage shows the difference between two flood depth or water level sets. The differences are divided into ranges or classes. Using the floodplains delineated in the previous steps, we’ll create a flood impact map. This can be used to compare how an area will react to a proposed levee for example.

  1. Select Flood | Conversion | Flood → Impact Map menu command.
  2. Choose the Original dataset based off your previous delineations.
  3. Choose your Modified dataset based off your previous delineations as well.
  4. Set the Increase and Decrease sections as desired.

Now that the flood impact map is created, you can use the Select Feature Polygon tool to double click on any of the polygons in the map. This will show you the Flood Extent Attributes dialog, which displays info such as the amount of change between the compared datasets as well as the impact class ID and name.

So this a brief overview of floodplain delineation from a scatter point file using WMS. Try it out in WMS today!

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WMS

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