WMS:Storage Capacity Curves

From XMS Wiki
Revision as of 19:57, 19 March 2013 by Jcreer (talk | contribs)
Jump to navigationJump to search

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.

File:Image144.gif

The volume between incremental areas A1 and A2 is computed using the following equation:

File:Image145.gif

where:

ΔV12 - The volume between areas A1 and A2.

Ai - surface area i.

h - vertical distance (E2-E1) between surface areas A1 and A2.

Ei - elevation of surface area 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