A GIS Lesson Copyright © ESRI. What is a Watershed? +15 Million People Credit USGSUSGS.

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Presentation transcript:

A GIS Lesson Copyright © ESRI

What is a Watershed? +15 Million People Credit USGSUSGS

The area of land where all of the water that is under it or drains off of it goes into the same place. Image Courtesy of EPAEPA

What is a Estuary? Courtesy of MSC

A semi-enclosed body of water that has a free connection with the open sea. Courtesy of MSC

What ways do you think scientist monitor the health of a bay or estuary? Credit: NASA/Goddard Space Flight Center Scientific Visualization Studio

The Environmental Protection Agency monitors watersheds across the United States. Credit EPAEPA

Two categories by which they characterize a watershed are: 1. Quality 2. Vulnerability Credit EPAEPA

7 Quality Indicators Rivers, Lakes, and Estuaries Meeting All Designated Uses Fish Consumption Advisories Indicators of Source Water Conditions Contaminated Sediments Ambient Water Quality Data (Toxic) Ambient Water Quality Data (Conventional) Wetland Loss Index Credit EPAEPA

8 Vulnerabilty Indicators Pollutant Loads Discharge (Toxic) Pollutant Load Discharge (Conventional) Urban Runoff Potential Agricultural Runoff Potential Population Change Hydrologic Modification Estuarine Pollution Potential Aquatic / Wetland Species at Risk Credit EPAEPA

We have the data… But is there any easier way to analyze it? Courtesy of MSC

To visualize the data we will use a web-based GIS application or a free viewer called ArcIMS. Copyright © ESRI

Either of these applications can take lots of data… …and tie it to a map. Courtesy of MSC

With GIS you can combine layers of information about a place to give you a better understanding of that place Copyright © ESRI

How healthy do you think is the Chesapeake Bay Watershed? Lets use GIS to take a look at the data. Courtesy of MSC

Now use your worksheet titled ‘Health of the Chesapeake Bay Watershed’ to help you analyze the data. Courtesy of MSC

Go to this website: Click on ‘Lessons on the Web’ Courtesy of MSC

Click on ‘GIS on the Web’ Courtesy of MSC

Click on ‘Applications’ and then click on your lesson. Courtesy of MSC