After computing a model with the SWMM solver, what does the following warning mean: "Maximum depth increased for node CB-XX"?
This is a SWMM warning that means node data has been altered to accommodate the connecting link. In the SWMM solver, the rim elevation of a node has to be at least equal to the crown elevation of the highest connecting link to the node. The maximum depth of the node is increased to match the highest crown elevation. That is not happening for some nodes in the model, so the program is making the necessary adjustments to elevation data.
You may want to review the elevation and invert data to make sure that it is correct.
More information on the SWMM warnings can be found at the following link: http://www.swmm5.net/2009/08/new-warning-messages-in-swmm-50014-to.html