The document provides guidelines for submitting manuscripts for the 13th International Drainage Workshop to be held from 4-7 March 2017 in Ahwaz, Iran. Key points include: - Manuscripts must be prepared in MS Word 2010 or earlier and submitted electronically, printed single-spaced with a 3cm margin. Tables and illustrations must be incorporated into the text. - The title page should include the full title, authors' names and affiliations, and contact details for the corresponding author. - Papers should include an abstract of up to 500 words and up to six keywords. The body of the paper should not exceed 15 printed pages. - References should be cited in the text by author and year in