Impaired Waters (e303d) Tutorial
This one-stop water quality assessments application was created to provide a more complete picture on activities and information available about water quality, watershed health, and the activities that have been on-going in the Office of Water Quality’s Total Maximum Daily Load (TMDL), Integrated Report, and Nonpoint Source Programs. For an overview on how to use this online e303d tool to find pertinent information in your area, follow the instructions below or return to the application.
Upon opening the application, you will see the statewide view, zoom in and out buttons with a full extent button, a location button for navigating to your current location, and a search box for querying by Watershed, County, Stream or Lake Names, and Address.
When entering information in the Search box, the address requires street address, city, and zip code. The county is searched using the Name and State, i.e., Marion County, Indiana. Also, watersheds can be searched by name or hydrologic unit code (HUC) chosen from a pick list and/or keyboard input. The Indiana Composite Geocoding Service is the Address reference. The World option can zoom out to any state/country in the event a reference map is needed. Once you select one and enter your search criteria, the map will automatically zoom to the selection and highlight a watershed, city, or county area selection.
Another tool provided is a spatial reference bar at the bottom left of the map screen that shows the location of the pointer in latitude/longitude decimal degrees. This can be helpful in locating a specific point anywhere on the map. The default coordinate system for this tool is WGS_1984_Web_Mercator_Auxillary_Sphere (3857) but this tool can also provide latitude/longitude in GSC_WGS_1984 (4326) in using decimal degrees from a non-web application resource such as this.
At the bottom center of the map is an arrow button that will provide a popup of the data for the selected features in each active data layer:
Click on each tab to see what data is available from each layer. Click on a record or group of selected records or set a Filter then click on “Zoom to” to take the map to the selection’s extent. Lastly, there is an Overview reference map window that can be activated using the bottom right corner arrow to toggle it off and on. The left bar list of layers can be toggled to slide left out of view to expand the map area by clicking on the left side arrow button. As always, pan and zoom can also be done using a mouse scroll button.
From a zoomed in extent, select a stream by hovering your cursor over a stream feature. A popup will provide the description of each category referenced by assessment use type. While all related use types are in the popup for that location, the colors on the map show the value for the values of the category per the use layer activated. To show each use’s values on the stream reaches, toggle on each of the 3 use layers separately. In the illustration below, the use shown on the map is the Fishing Use Category, and the selected stream is Page Ditch which is highlighted in blue. The purple value of this stream prior to selecting it denotes the Category 3: Insufficient data to determine if this use is attained. This is the Category shown in the popup for Fishing Use.
The popup also provides what impairments resulted in placing this reach on the 4A, 5A or 5B category lists in the 2014 Integrated Report. On Page Ditch, high E. coli counts placed this on the 303d List for impaired Recreation use. And the review of parameters that points toward impaired biotic communities placed this on the list for impaired Aquatic Life Use. However, since a TMDL for E. coli had been approved for this reach, the Category has been changed to 4A. The TMDL document is listed at the bottom on the popup as well as the Watershed Management Plan for this watershed (The side scroll bar provides this additional information.)
Each water body may include 1 or more impairments or, if there are none, a message stating that there are none will be displayed. Below the impairments listings are the categories numbered and further explained. If an impairment category is listed, it is hyperlinked to a list of impairment descriptions. If there was a TMDL Report written for the impairment, a hyperlink of the document name will be listed beside the impairment. This hyperlink opens a new window to the browser where the report summary will be found along with the links to the complete report. Also provided are hyperlinks to completed watershed management plans. The link takes you to a new window again with the summary page along with the links to the completed plan.
- Return to the Online e303d Tool