• Stay in the Flow

    Keep up-to-date on Hydraulic Unit policies, procedures, innovations, updates, advertisements, etc.… by signing up to recieve the Hydraulics Unit Newsletter.  To sign up, just complete the simlple form @Hydraulic Unit Announcement Notifications.


  • Revised Pipe Material Selection Guide

    The Pipe Material Selection Guide has been updated to incorporate guidance for polypropylene pipe.   The updated guide is located on the ​Guidelines for Drainage Studies page and can be downloaded directly by selecting the following link NCDOT Pipe Material Selection Guide 20190926.p​df​

    This update replaces the guidance in Appendix H Item 1 of the 'GUIDELINES FOR DRAINAGE STUDIES AND HYDRAULIC DESIGN 2016".

  • New CADD details for Stormwater BMPs


    NCDOT Hydraulics Unit is pleased to announce the release of new CADD details for Stormwater BMPs.  Details include items for dry detention, filtration, bioretention basins and more.  Please update your NCDOT CADD Workspace for Hydraulics_STDS to access these details.
  • FEMA Flood Insurance Study Data (models, etc.) Requests

    ​Please use the Flood Insurance Study Data Request Form under "MOA Forms" for requesting hydraulic models or other needed FIS data not available on the NC Floodplain Mapping Program's Flood Risk Information System website.  This will help us to deliver the requested data more quickly and efficiently.​

  • HEC-RAS 5.0.3 and above is Accepted for Use

    ​HEC-RAS 5.0.3and above accepted for use on NCDOT projects.  Please note, HEC-RAS versions 5.0 and 5.0.1 are NOT acceptable due to programming errors.​

  • Change in NCDOT definition of "No-Rise"

    ​February 16, 2017 - Effective immediately, per NCFMP, NCDOT's definition of "No-Rise" (in Section 15.9 of the 2016 Guidelines) must be revised to no longer include up to a 0.1 ft. increase; rather, the "No-Rise" condition to qualify for a Type 1 MOA submittal must be no change in BFE (0.0 ft.) or a decrease of 0.1 ft. (rounded to tenth of foot).  An increase of 0.1 ft. or greater would require a CLOMR for projects in a Detailed Study.  In a Limited Detailed Study reach, an increase from 0.1 ft. to less than 0.5 ft. would now qualify as a Type 2d.  NCDOT Hydraulics is working on updating guidance on this.​

Was this page helpful?