The customer needs the .txt file of the proposed topography. He wants this information to export the file to AutoCAD Civil 3D, have all the fields together and be able to link all the drainage canals for calculations.
You can export the Proposed Topography as .agd file and change the extension from .agd to .txt. To export, go to Tools > Export Landform Design. You will also need to convert Latitude & Longitude to Eastings & Northings.