Title page from WBD Standards TM11-a3 publication Version 5

Title page from the Federal Standards and Procedures for the National Watershed Boundary Dataset (WBD), Techniques and Methods 11-A3, Fifth Edition, 2022.This document establishes Federal standards and procedures for creating the WBD as seamless and hierarchical hydrologic unit data, based on topographic and hydrologic features at a 1:24,000 scale (Alaska at 1:63,360 and Caribbean at 1:25,000)