Revised guidance on selection of approaches to flood estimation

Abstract

Hydrologists are required to estimate flood magnitudes for the design of culverts and bridges for roads and railways, the design of urban drainage systems, the design of flood mitigation levees and other flood mitigation structures, design of dam spillways, and many other situations. The flood characteristic of most importance depends on the nature of the problem under consideration, but it is often necessary to estimate peak flow, peak level, flood volume, and flood rise. Design objectives are most commonly specified using risk-based criteria, and thus the focus of the revised ARR guidance (for Chapter 3 of Book 1) is on the use of methods that provide estimates of flood characteristics for..