Skip Navigation


United States Department of Agriculture
Natural Resources Conservation Service

2118 W. Park Court, Champaign, IL 61821
Phone: 217/353-6600 Fax: 217/353-6676 Website:

DATE: May 6, 2008

SUBJECT:  National Engineering Handbook Part 645, Engineering Technical Materials

Purpose:  To update Illinois Supplements to the Engineering Field Handbook, Chapter 6

Expiration Date:  Upon receipt.

Explanation: This notice is to announce the availability of additional digitized and updated Illinois supplements to the Engineering Field Handbook (EFH).

Illinois supplements to the EFH are now complete in digital form for the following chapters:

  • Chapter 1 – Engineering Surveys (distributed 10/24/07 with EFH Notice 29)
  • Chapter 2 – Estimating Runoff and Peak Discharges (distributed 10/24/07 with EFH Notice 29)
  • Chapter 3 – Hydraulics (distributed 12/20/07 with EFH Notice 30)
  • Chapter 6 – Structures (distributed with this Notice)

Some of the tabular data in the Chapter 6 supplements have been enlarged for legibility, utilizing multiple pages where needed; however, content has not been changed. The following list outlines the updated and new Illinois supplements released with this notice. The table of contents for Illinois EFH supplements will be updated when all chapters are complete.

Existing IL supplement:

Replaced by :


6-7.1 General Guide to Structure Selection (new)

6-107(1) dated 7/02

6-107(1) Pre-Approval of Smooth Interior PE Tubing for Fills dated 5/08

6-107(2) dated 10/97

6-107(2) Pre-Approval of Smooth Interior PE Tubing for Fills dated 5/08

The Illinois NRCS engineering website will be updated to include the new digital versions of the Illinois supplements at

Filing Instructions:

All holders of Engineering Field Handbook binders should:

  1. Remove Illinois supplements 6-107(1) and 6-107(2).
  2. Print out the attached updated three supplements on green paper and file in the EFH. Illinois supplements are numbered to correspond to the page number of the national EFH, and are filed directly after the national page with the same base number.

Any questions regarding this submittal should be directed to Ruth Book, State Conservation Engineer at (217) 353-6626.

Ruth Book Signature
State Conservation Engineer


This attachment requires  Adobe Acrobat Reader to view: 
EFH-Ntc32_050608.pdf  [PDF, 58kb]

The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) or (202) 720-6382 (TDD).