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Iowa Amendments to the Engineering Field Handbook

The following Iowa Amendments to the Engineering Field Handbook (EFH) should be used in conjunction with the appropriate chapters in the national EFH:

Chapter Pages Description Amendment Number Amendment Date
2 IA2-91(1-8) Hydrologic Soils Groups for Iowa Soils 59 April 2013
2 IA2-91(9-11) Hydrologic Soil-Cover Complexes (Runoff Curve Numbers) 50 Nov 2011
2 IA2-91(10a) Runoff Curve Numbers for No-Till 52 Mar 2008
2 IA2-91(12-22) Rainfall Frequency Tables 50 Nov 2011
2 IA2-91(23-29) Monthly and Annual Evaporation and Precipitation 50 Nov 2011
2 IA2-91(30-31) One-Hour Peak Runoff 50 Nov 2011
2 IA2-91(32-34) Runoff From Pothole Topography 50 Nov 2011
2 IA2-91(35) Effects of Terraces and Water and Sediment Control Basins on Runoff 59 April 2013
6 IA6-15(6-8) Corrugated Steel/Aluminum Drop Spillway 57 Apr 2012
7 IA7-10(1-7) Soil Erodibility Categories 55 Apr 2011
7 IA7-12(1) Vegetal Cover Factors 55 Apr 2011
7 IA7-20(1-12) Grassed Waterway Design Charts for Drainage Areas from 0 - 30 Acres 55 Apr 2011
7 IA7-20(13-25) Waterway Design for Flat Waterways with Out-of-Bank Flow 55 Apr 2011
7 IA7-24(1-2) Geotextile Reinforced Vegetated Outlet Criteria and Design Procedure 55 Apr 2011
7 IA7-E(1-5) EFT Preferences for Grassed Waterways 61 Nov 2014
8 IA8-18(1-2) Steep Front - Farmable Backslope Terraces 60 Feb 2014
8 IA8-26(1) Maximum Terrace Spacing Chart 60 Feb 2014
8 IA8-46(1-2) Graphical Routing Procedure 60 Feb 2014
8 IA8-46(3) Relief Well Design 60 Feb 2014
8 IA8-C(1-13) EFT Preferences for Terraces 61 Nov 2014
16 IA16-6(1-3) Riprap Bank Stabilization Design Procedure and Criteria 47 May 2003
17 IA17-24(1-12) Hot and Cold Weather Concreting 11 Feb 1983
17 IA17-53(1-9) Agricultural Waste Storage Structures - Approved Standard Plans 51 Mar 2008

Several other Iowa Amendments to the EFH are available but need to be reviewed before being included on this page. It is the user's responsibility to insure that information in those amendments is current and correct before using them. 
(Note: Many of these may be found in the eFOTG, Section 1, Reference List, Engineering References section.)

 

Contact:
Allen Gehring, Iowa NRCS State Engineer
Phone: 515-284-4357