Regulatory Floodway Width Estimation

by Christos Hadjitheodorou, Univ of Patra, Patra, Greece, Univ of Patra, Patra, Greece,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


A simple algebraic equation is presented for determining the width of the regulatory or designated floodway. The equation shows that for a given ratio of the permissible increase in flood depth to the original depth of flooding, the ratio of the associated reduction in the floodplain width over the original width is proportional to the following ratios: floodplain roughness over channel roughness, channel top width to floodplain width and channel hydraulic radius over floodplain depth of flooding.

Subject Headings: Hydraulic roughness | Floods | Hydraulic design | Hydraulic models | Mathematics | Mathematical models | Hydrologic models | Runoff

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