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Nonpoint Source Water Pollution

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e303d Tutorial

This one-stop water quality navigation 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 the Online e303d Tool to find pertinent information in your area, follow the instructions below.

Base Map/Find By

Upon opening the application, you will see the statewide view, a zoom slider with full extent button, and these 2 query tool boxes for navigating and searching the data. The Base Map box offers 3 different backgrounds on which to display the impaired waters data. The default is Streets, but the Imagery (the 2005 aerial orthophotography) and Topo (the USGS Topographic maps) are also provided.

The Find box offers different options for zooming directly to an address, a county, a watershed, or a waterbody. The address requires street address, city, and zip code. The county is a pick list of Indiana counties. Watersheds can be searched by name or hydrologic unit code (HUC) chosen (by radio button) from a pick list and/or keyboard input. The dark gray arrows next to the options can be toggled to minimize the search query.

303(d) Categories

Once zoomed into a location, you will see that there are more options for querying the data in the Base Map box. Under Show Water Quality For: there are 3 radio buttons that represent the use assessment types of Fishing, Recreation, and Aquatic Life as used in the biennial Integrated Report. The default is Fishing and the different line colors with numbers refer to the categories assigned to each water body. These categories are explained by placing the cursor in the number. A popup will provide the description of each in turn. Selecting another assessment type will cause the colors to change on the mapped water bodies. These changes are based upon the impairment parameters that most affected the use selected. Click on each radio button to see the changes.

Waterbody Information

To review the information about a specific water body, place the cursor on it and a window pops up with the Assessment Unit Name, the Reach Code, and what has been found in the water. This may include 1 or more impairments or if there are none a message stating that there are no known impairments will be displayed. If an impairment is listed, it is hyperlinked to a list of descriptions. If there was a TMDL Report written for the impairment, a hyperlink of the word “Report” will be listed beside the impairment. This hyperlink opens a new window to the web page where the report summary will be found along with the links to the complete report. Below the impairments listings are the categories numbered and further explained.

Waterbody Information Details

At the bottom of the map’s popup window, there is the reference to the watershed information of which this reach is a part. Click on the arrow toggle button and the window drops down further to reveal the name and HUC number for the watershed. Also provided for the watersheds with completed watershed management plans is the name of the plan with the hyperlink to its summary page along with the links to the completed plan.