Tag Archives: Watershed
By Victor de Loza & Nahm H. Lee, Ph.D., Santa Clara Valley Water District Subcatchment delineation is an essential step for watershed modeling studies. Flow directions can be changed by roads, artificial surfaces, and storm drains. Urban subcatchment delineation is … Continue reading
By Papantzin Cid, GIS Analyst Hydromodification is the change in channel formation associated with changes in sediment; changes in sediment are usually caused by land use alterations. In an effort to mitigate the effects of hydromodification, the California State Water … Continue reading
By Steve Kopp, Esri For the water resources community, one of the highlights at this year’s Users Conference was the public beta release of the watershed delineation service in ArcGIS Online. This geoprocessing service is now available to everyone with … Continue reading
Wupperverband is a nonprofit agency in Germany that is responsible for river and watershed management including wastewater treatment, water resource management and flow/flood control. ArcGIS Online is being used to extract date, input date and enable the exchange of data across the agency.
Tom Freyburg, Water Wastewater International, spoke to Karl-Heinz Spies about Wupperverband’s use of GIS Technology and how it plays a key role in managing their business. Click here to view the video.
We’d love to hear your feedback. Download the BETA 10.1 Arc Hydro Tools (32MB). Please contact email@example.com with any and all feedback. Arc Hydro Tools are free with your ArcGIS software license. In the coming months, documentation for the tools … Continue reading
by Laurie Williams, Senior Planner/Watershed GIS, County of Marin, CA
The Department of Public Works of Marin County, CA (just north of San Francisco, CA) launched a watershed program to integrate flood protection, stream and wetland habitat restoration activities, fish passage, and water quality improvements. Instead of looking at flooding issues on a site by site basis, we solve flooding problems at a watershed scale, and employ solutions such as habitat restoration to reduce flood risks.
From the outset, we decided to base our stakeholder outreach, collection of scientific studies and technical reports, and dissemination of information from the Marin County Watershed Program website (http://www.marinwatersheds.org) in order to save paper resources, be more user-friendly, support community outreach and more efficiently advertise our updates than is possible with more traditional printed reports and documents.
Our website is the major repository of meeting notices, posted reports, and maps. Our website designer, Athena Design, chose a color palette to enhance and reflect the colors of nature: the blues of water, the greens of plants, and browns for earth tones; orange splashes complement the dominant blue. We use the palette extensively in producing the watershed maps, as well as for printed materials and PowerPoint presentations for a unified design.
Elevation data is an essential piece of GIS data for hydrologic applications, but it’s big, not always easy to get and for modeling surface water flow requires specialized processing to become useful. Elevation data and services are coming to ArcGIS Online, including some hydro specific capabilities.
World Elevation Services
The World Elevation Services became available for beta testing last fall and will be released at the end of March. There are image services, data download services, and analysis task services available, as well as sample applications. The services are built from a collection of data sources, ranging from less than a meter resolution up to almost 5 kilometers, and includes services of elevation, shaded relief, slope, and aspect. We will continue to add new data as it becomes available. Like other things on ArcGIS Online these services can be used in Desktop and any other Esri clients, and also in other applications via REST or SOAP. http://resources.arcgis.com/content/imagery/10.0/world_elevation
Since you’re reading the Hydro Blog, your obvious thought is, when can I start using elevation web services for water resources applications? You’ll be happy to know we’re working on it. You’ve probably noticed a shift happening in ArcGIS Online and the Resource Centers to more specific application areas, in places like ArcGIS for Local Government and right here for Hydro.
Esri has released a new version of the Arc Hydro Tools, version 2.0.
This is good news for those of you who have been waiting to upgrade your ArcGIS software until the new Arc Hydro Tools are ready. In version 2.0, Arc Hydro tools are now fully compatible with ArcGIS version 10.0.
In addition to full compatibility with the software version 10.0, the new version of the Arc Hydro tools are also now fully available in the geoprocessing environment.
A lot of effort has been put into this release into improving performance for preprocessing large datasets. The new version runs better and faster with larger datasets.
Arc Hydro Tools are free with your ArcGIS software license. You may download version 2.0 of Arc Hydro Tools here (32MB).
If you also need the tutorial data for both Arc Hydro Tools and Arc Hydro Tools for Geoprocessing, you may download both in a bundle here (146MB).
For past versions of Arc Hydro Tools, please see the Hydro Data Model page at esri.com. Be sure to keep visiting the Hydro Data Model page for more information about upcoming Arc Hydro training classes and workshops.
Special thanks to Michael Dangermond for providing this post. Questions for Michael: MDangermond@esri.com.
What it does: The Esri Hydro Viewer presents information about watersheds, including spatial information about contributing watershed area. For example, if you click on a watershed in Texas, the application presents a detailed report of information about the selected watershed, and highlights the larger hydrologic unit that it is contained within. The report tells you what category of watershed you have selected, and gives the names of the larger contributing units, as well as the HUC number, area, mean annual flow, cumulative drainage, and a brief description of the watershed. The application presents information about the watershed and helps you visualize how your selected watershed fits into the larger national context.
Esri Hydro Viewer with Subbasin Austin-Oyster in Texas selected.
The application also has navigational functionality that makes it easy for you to zoom between region, subregion, and subbasin scale levels, illustrating to map readers the multi-scaled nature of the data, and making those relationships easy to understand—especially to someone who is does not know much about hydrology.
Zoomed to Subregion level, Galveston Bay – San Jacinto.
Even though the base map you see is our Hydro Basemap, we use Bing Maps for our search functionality. To do this, you need to hide the Bing Maps layer so the geocoding works, but the layer does not appear. Using Bing Maps requires a Bing Maps application “key,” which is packaged together with ArcGIS Server 10.0. You can obtain this by going into Server Manager – Settings – and Bing Maps Key. Further instructions on using Bing Maps can be found here.
Whenever you click on the map, two queries are executed (unless you are at the Regional scale level) – one for the selected unit, and one for the larger unit that it is contained within. It looks like the second query is done using a spatial relationship, but we actually used a “query.where” to query for the unit with the same name as the selected unit. By querying based on attributes, our queries run much faster.
The charts in the reports were generated using Google Charts, which makes it very easy to create nice looking visual aids. As you can see in the figure below, not much code is required to build the charts. We used pie charts to represent our data, but there are many other different types of charts available for use as well.
Three different report templates are specified in the code – one for the Region level, one for the Subregion level and one for the Subbasin level. The formatting is mostly done using plain HTML so it would be easier to modify the reports.
The Esri Hydro Viewer can be customized for other data or purposes. For questions or assistance with this please contact Mapping Center.
Special thanks to Kenny Ling for providing this post. Questions for Kenny: Kling@esri.com.