Problem

User is trying to model elliptical, arch, and box channel, but that is not one of the standards for PondPack.

Problem ID#: 43645

Solution

A workaround for this if you can't approximate the shape with one of the available types, is to choose "elevation-flow-area curve" for the conduit type in the conduit properties. Then define the table of elevation-flow based on the ellipse section by computing the rating curve externally and entering it. If you have FlowMaster you can use that, since it has an elliptical pipe worksheet and can generate rating tables.

An irregular channel with a user defined station vs. elevation curve can also be entered to model these and other non-default channel shapes.