Find Your Hydrologic Unit Code (HUC)
Watersheds are delineated by USGS using a nationwide system based on surface hydrologic features. This system divides the country into 21 regions (2-digit), 222 subregions (4-digit), 370 basins (6-digit), 2,270 subbasins (8-digit), ~20,000 watersheds (10-digit), and ~100,000 subwatersheds (12-digit). A hierarchical hydrologic unit code (HUC) consisting of 2 additional digits for each level in the hydrologic unit system is used to identify any hydrologic area.
USGS StreamStats
StreamStats is a Web-based Geographic Information Systems (GIS) application that provides users with access to an assortment of analytical tools that are useful for a variety of water-resources planning and management purposes, and for engineering and design purposes.
FEMA Flood Maps
The FEMA Flood Map Service Center (MSC) is the official online location to find all flood hazard mapping products created under the National Flood Insurance Program, including your community’s flood map.
North Carolina Field Office Technical Guide
Technical guides are the primary scientific references for NRCS. They contain technical information about the conservation of soil, water, air, and related plant and animal resources.
NRCS Area of Potential Effect (APE) Analysis WebTool
Created by the North Carolina USDA-Natural Resources Conservation Service (NRCS) Ecological Sciences Section (ECS) to serve as a Basemap for the collection and display of Special Environmental Concerns (SECs) and other relevant natural resources data in the form of geospatial information. The APE Analysis WebTool is a decision-support tool intended to be used by natural resource professionals to assist with pre-planning, early-scoping, and routine environmental analysis activities in support of the National Environmental Policy Act (NEPA).
NRCS Web Soil Survey
Web Soil Survey (WSS) provides soil data and information produced by the National Cooperative Soil Survey. It is operated by the USDA Natural Resources Conservation Service (NRCS) and provides access to the largest natural resource information system in the world.