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Starting StarHydro

StarHydro is a Java application for watershed analysis, which runs on standard Athena Solaris, standard Athena Linux, Windows XP and Mac OS X computers. In a browser go to http://web.mit.edu/star/hydro and click "Start" to open StarHydro.

Your system may prompt you to trust running this application; please click "Run" in the dialog box.

Security Warning

Selecting a Map

The StarHydro main screen will appear and request that you select one of the available maps. For this manual, we will select StarHydro_Coarse.

Select map

Delineating Watershed

On the StarHydro main screen, start delineating watershed by selecting the Watershed tab and clicking Set watershed outlet point(1). To delineate watershed, click on the map, near a stream(2).

Delineating Watershed

Watershed View

Watershed view consists displays information about terrain (DEM(3)) and watershed. Information presented includes watershed height range, area, main stream length, sum of all stream lengths, length and area relationship, stream frequency and drainage density.

Watershed View

GIUH

Double click on the map to add rain gauges. Save rain gauges will save the data as an excel file. To add rain gauges from Excel, switch from Gauges to Chart and click Load Rainfall data.

GIUH View

Excel spreadsheet

Load rainfall data

GIUH allows manipulation of Instant Unit Hydrograph by changing channel routing and overland routing velocities. The map on the right and GIUH are colored using Data Layers Color Schema(4). Modifying the stream threshold will result in changes in GIUH.

Data Layers Color Schema

The convolution chart presents discharge at the watershed outlet. Convolution depends on defined rainfall and GIUH. To change rainfall, click on the button next to Current data. This will open a file dialog that will allow you to select one of predefined one of the existing rainfalls or create your own input file.

GIUH View

Load rainfall

Modifying velocities or stream accumulation threshold will change GIUH and convolution chart.

GIUH and Convolution

Manipulating the Default View

  • To rotate the 3-D window,
    • On Windows left-click and drag the mouse.
    • On OS X click and drag the mouse.
  • To move up/down right/left,
    • On Windows right-click and drag the mouse
    • On OS X apple-click and drag the mouse
  • To zoom,
    • On Windows Alt-left-click and drag the mouse (or middle-click and drag on a 3-button mouse)
    • On OS X option-click and drag the mouse

1) Watershed outlet point is place where watershed drains, i.e. lowest point in the basin
2) Stream is defined as area of watershed that has higher than predefined area draining into it, to modify drainage area required to form a stream change value of Stream accumulation threshold slider or field
3) Digital Elevation Map
4) Color Schema can be modified by double-clicking on colored tab, and picking one of the available ones from the list