# WMS:Storage Capacity Curves

There are three different methods for defining storage capacity: volume vs. elevation, area vs. elevation, and known geometry.

In all three cases a relationship between elevation and volume will be computed. For the volume vs. elevation option this is explicitly defined. If area vs. elevation is specified, then a corresponding volume for each elevation is computed using the conic method. The conic method is illustrated below.

The volume between incremental areas *A _{1}* and

*A*is computed using the following equation:

_{2}where:

*Δ V 12*– The volume between areas*A*and_{1}*A*._{2}

*A*– Surface area_{i}*i*.

*h*– Vertical distance*(E*between surface areas_{2}-E_{1})*A*and_{1}*A*._{2}

*E*– Elevation of surface area_{i}*i*.

The same equation is used to compute the volume between each adjacent set of surface areas, with the bottom area assumed to be 0. A TIN can be used to automatically create and store for use in the detention basin calculator the elevation-volume relationship.

If the basin geometry option is chosen then an elevation vs. volume relationship is computed directly from the geometry defined for the basin.

## Related Topics

WMS – Watershed Modeling System | ||
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