EFH2 Software
Website to download NRCS Technical Tools.
The EFH-2 software implements the procedures described in the NEH 650 - Engineering Field Handbook Chapter 2 (EFH-2) for estimating runoff and peak discharge. Required information includes watershed characteristics (drainage area, runoff curve number, watershed length, watershed slope) and rainfall amount and rainfall distribution. The link below will take you to the NRCS Tech Tools page. Find and download the latest version of EFH-2.