22 Φεβ 2014 (πριν από 7 χρόνια και 6 μήνες)

277 εμφανίσεις


What is the HIT Model?

argeting (HIT) Model is an online tool designed to identify

of extreme
sedimentation and erosion
in agricultural areas
within a watershed. The HIT Model uses Geographic
Information Systems (GIS) and sometimes Bing Maps to display
these sediment and erosion data

contribute the most amount of sediment deposition.

Who developed the HIT Model?

The HIT Model was develo
ped by the United States Department of Agriculture’s Natural Resources
Conservation Service (NRCS), the Michigan Department of Agriculture (MDA), the Huron Conservation
District, and Michigan State University’s Institute of Water Research (IWR). The tutor
ials and
demonstration videos specific to West Michigan were developed by Grand Valley State University’s Annis
Water Resources Institute (AWRI) through a grant by the Frey Foundation.

Who can use the HIT Model?

Organizations like conservations districts,

watershed groups, or other organizations that coordinate and
develop methods to reduce and control the erosion and sedimentation in their respective areas.

How does the HIT Model work?

The HIT Model combines the results from two
geospatial models

to map and quantify sediment loads.
The first model is the Spatially Explicit Delivery Model (SEDMOD). This model provides an estimate of the
percentage of eroded soil that finds its way into a nearby waterbody. The second model, the Revised
Soil Loss Equation (RUSLE) developed by the NRCS, estimates the annual volume of soil eroded
in tons/acre/year. The outputs for both models are integrated to estimate the annual volume of
sediment transport to a waterbody from a specific area.

How can
I get to HIT Model online?

To access the HIT Model on the internet, the user must first launch an internet browser (ex. Internet
Explorer, Firefox, etc.). Once the browser is open, the user must type into the URL bar

What if I ne
ed help learning how to use the HIT Model?

Tutorials and demonstration videos are available online on the AWRI webpage (
These five tutorials and videos under the “HIT Model” table on the l
hand margin will cover how to use
the HIT Model.

What are the advantages to using the HIT Model?

There are three main advantages to using HIT Model outputs for your watershed. The

is though the
HIT Models interaction with Bing Maps the user c

visually see specific areas of high erosion and
sedimentation using aerial photographs. Using the “Bird’s eye” view option of the Bing Maps toolbar the
user can explore the high
risk areas in even greater detail.
, the creators of the HIT Model ha
already determined how much sediment or erosion can be reduced if a BMP is used. A user can also
compare different BMPs against each other to see which one is most cost effective.

, the
information is available for the whole Great Lakes regions.

This is an improvement on the first version of
the HIT Model, which only had three watersheds.

What are the HIT Model’s

The limitation to the HIT Model are that it is only applicable to agricultural lands and the model can only
classify area
s of sedimentation and erosion correctly 70% of the time. This means that sediment and
erosion from the urban landscape would have to be calculated a different way.

It is also recommended
that a trained professional inspect the area to confirm that it is a site of sediment or erosion input before
installing a BMP.

Are there any other documents I can download on the HIT Model?

A tutorial was created for the Toledo Metropolitan Area Council of Governments, and focuses on the
Swan Creek Watershed in northern Ohio (Download the tutorial at

Also, a brochure and PowerPoint presentation are available on the HIT Model webpage.

Who do I contact with questions?

Question about the overall HIT Model project can be directed to Jon Bartholic at
echnical questions (or errors) can be forwarded to Glenn O’Neil at

Questions about
the tutorials or demonstration videos can be directed to Jon VanderMolen at