The Model Drainage Manual compiles generic design policies and state-of-the practice design procedures, including example problems, in order to provide a foundation on which any Federal, State, or local agency can produce its own customized drainage policy and procedure manual. Superseding all previous versions, the 2005 Edition of this Manual includes both Microsoft Word files and easily searchable Adobe PDF files for two manuals--one in U.S. Customary units and one in Metric (SI) units.