The Interim Draft of the National OHWM Manual provides draft technical guidance for identifying aquatic resources that may be subject to regulatory jurisdiction under Section 404 of the Clean Water Act (CWA) and/or Sections 9 and 10 of the Rivers and Harbors Act of 1899 (RHA), by providing a standard process, uniform datasheets, and unified field procedures to identify and delineate the OHWM of rivers and streams located throughout the Nation.