Improving the Flood Estimation Handbook (FEH) statistical index flood method and software Updates to the Flood Estimation Handbook. The creation of an improved database of systematically recorded flood data has led to updates to the technical details of the Flood Estimation Handbook. From: If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email: enquiries@environment-agency.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use. Details This research project focused on improving several aspects of the Flood Estimation Handbook (FEH).