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Allow the input of different surfaces with appropriate runoff coefficients for each subcatchment. For example, paved 100%, tarmac roades 90/95%, gravel 30/50%, soft 10%. This would provide a better audit trail for the net contributing areas input to a network and clearer calculations for approving authority submissions. It would avoid the need to calculate a weighted runoff coefficient outside of the software, perhaps in Excel.
We use HydroCAD instead of InfoDrainage because it automates this.
Automating this process by allowing users to clip layers from Civil 3D (Soils, landuse, catchment areas) to create a composite curve number quickly would also be helpful
Thank you for the suggestion and thanks to those who voted/commented.
This is now under consideration for future development.