UG_210_21_11 - UG 210-21-11 ENG - EFH-2, Version 2.0.11, Computer Program
UG 210-21-11 ENG - EFH-2, Version 2.0.11, Computer Program
User Guide:  UG 210-21-11    Date:  August 19, 2021  
Subject:  ENG - EFH-2, Version 2.0.11, Computer Program  

Purpose.  To announce the availability of the Engineering Field Handbook, Chapter 2 (EFH-2), version 2.0.11, computer program and provide instructions for obtaining the software.      
Effective Date.   Effective upon receipt.   
Background.   The Natural Resources Conservation Service (NRCS) uses the Title 210, National Engineering Handbook, Part 650, “Engineering Field Handbook”, Chapter 2, “Estimating Runoff Volume and Peak Discharge” (210-650-2) to determine runoff volume and peak discharge for small single subarea watersheds in the design of on-farm conservation practices.  The EFH-2 software automates the procedures described in 210-650-2.         

Special Instructions. The EFH-2 version 2.0.11 built-in database contains National Oceanic and Atmospheric Administration (NOAA) Atlas 14 rainfall data and NRCS-developed rainfall distributions for all States except California (Area 2 and Area 4), Idaho, Montana, New Mexico, Oregon, Utah, Washington, and Wyoming. This version updates the rainfall database used in EFH-2 version 2.0.1 to include Arizona, New Mexico, and Utah; and corrects the rainfall distribution for the Northeastern States (Connecticut, Maine, Massachusetts, New Hampshire, New York, Rhode Island, and Vermont). This version contains no computational changes.

Distribution. NRCS tested and CCE certified EFH-2 version 2.0.11 for deployment to NRCS Information Technology Services (ITS) supported workstations. The project reference number is RFC#CRQ4004972.

EFH-2 version 2.0.11 replaces all previous versions of EFH-2. This directive cancels, deletes, and replaces the previous notification “User Guide 210-21-1: ENG – EFH-2, Version 2.0.1, Computer Program,” dated March 8, 2021.

NRCS users may obtain the EFH-2 version 2.0.11 computer program through the “Software Center” application for installation on NRCS computers. Installing EFH-2 version 2.0.11 will uninstall previous versions. It is not possible to have multiple versions of EFH-2 installed on a single computer.

Filing Instructions. NRCS does not distribute printed copies of EFH-2 program documentation. Users wishing to retain program documentation can print paper copies and place it in a three-ring binder adjacent to other NRCS technical directive.

Contact.   Direct questions and comments regarding software operation to appropriate State-level staff or to Quan D. Quan, Hydraulic Engineer, West National Technical Support Center, Beltsville, MD, at 301-504-3952 or .

Direct general questions regarding this user guide notification to Claudia C. Hoeft, National Hydraulic Engineer, at (202)720-0772 or     



   Deputy Chief for Science and Technology   

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