In order to calculate the amount of evaporation and/or the amount of
energy production from hydropower, WEAP must have a function to convert
between volume and elevation. This function is defined by the points on
the **Volume-Elevation Curve**. Values
between the points are interpolated. You must enter at least one point,
corresponding to the total storage capacity of the reservoir. If you choose
to model the reservoir as a box with straight sides, you do not need to
enter any other points.

Click on **Add** () to add a new point. After you have at least one point (other
than 0, 0), you can create or move points by clicking on the graph.

Click on **Excel** to export the
list of volume-elevation data points to Excel.

**Tip**: You can copy a two-column
or two-row array of Volume-Elevation points from Excel and paste into
the Volume-Elevation table in WEAP. Optionally,
you can apply conversion factors to the volume or elevation data. When
you do this paste, all existing data in the V-E table in WEAP will be
erased, and replaced with the pasted data.

**Entered on**: Data View, Branch: Supply
and Resources \ Local or River \ Reservoir, Category: Physical, Tab: Volume
Elevation Curve (Current Accounts only)