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SewerGEMS: issue with invert level design?

Hello,

I am working on design sewerage system for a zone, about 22 km of networks are collected with one station.

when i choose the design engine it the file gives me error that the invert level is higher that the ground level.note : the ground elevations are mostly in negative.

so i tried to change the invert levels to -20 m but it didnt work as well because it kept the slope as min and contained desgin using -20 m level.

another issue is conduit catalog should contain conduits that available for design.

thank you