**[An Introduction to WEPPCAT]{.underline}**

**[The Water Erosion Prediction Project Climate Assessment
Tool]{.underline}**

**Tutorial 1**

1\. Open your internet browser

2\. Type [www.weppcat.net](http://www.weppcat.net/) into the address
bar. You should now see the screen below.

![](media/image1.png){width="4.50625in" height="3.604861111111111in"}

3\. Find the tabs in the yellow top portion of the page. Click on
**Help**. You should see the screen below.

4\. Now click on the purple book logo next to the word WEPPCAT. You may
wish to browse through the help topics that you now see listed.

![](media/image2.png){width="4.373611111111111in"
height="3.5069444444444446in"}

5\. Next click on the **Scientific References** tab. You should see the
screen below. If you click on one of the references, you will be linked
to an online copy of the article.

![](media/image3.png){width="4.372916666666667in"
height="3.498611111111111in"}

6\. Next click on the **Links** tab. You should see the screen below.

![](media/image4.png){width="4.372916666666667in"
height="3.498611111111111in"}

7\. All of these links are worth exploring. Of particular interest to
this tutorial is the documentation of the WEPP model. To reach this
information click on the **WEPP Software** link.

8\. Click on the **WEPP Model Documentation** button in the
documentation box. You should now see the screen below. The pdf files
linked to this page provide detailed information about how the WEPP
model works.

![](media/image5.png){width="4.372916666666667in"
height="3.498611111111111in"}

9\. Next click on the **Databases** tab in the yellow top portion of the
page. You should see the screen below. These databases represent the
input data used to run WEPPCAT. You may want to take some time to
explore the data in each of the three databases.

![](media/image6.png){width="4.372916666666667in" height="3.4875in"}

![](media/image7.png){width="5.893055555555556in"
height="4.682638888888889in"}

Step 8. Click the **Compare** button to view the new results next to the
baseline results. Notice that the average annual runoff, sediment yield
and soil loss all increased as a result of more intense rainfall events.

![](media/image8.png){width="6.0in" height="4.8in"}

![](media/image9.png){width="6.386111111111111in"
height="5.1194444444444445in"}

![](media/image10.png){width="6.786111111111111in"
height="5.429166666666666in"}

Tutorial 4

**Objective** -- Learn to use the filter strip optimization tool

![](media/image11.png){width="6.0in" height="4.8in"}

Notice that the soil loss is negative over the length of the buffer
strip. If the buffer strip had not been used sediment yield would have
been 3.3t/ac/yr, as it was in the second tutorial instead of 2t/ac/yr as
it is now.

![](media/image12.png){width="7.135433070866141in"
height="3.5161417322834647in"}

**Tutorial 5**

**Objective -- Learn to use PRISM to adjust temperature and
precipitation for elevation**

![](media/image13.png){width="6.021653543307087in"
height="1.1708661417322834in"}

![](media/image14.png){width="1.9409722222222223in"
height="1.5458333333333334in"}![](media/image15.png){width="2.0083333333333333in"
height="1.5583333333333333in"}![](media/image16.png){width="5.946527777777778in"
height="4.756944444444445in"}