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Open AccessArticle

A Cost-Effectiveness Protocol for Flood-Mitigation Plans Based on Leeds’ Boxing Day 2015 Floods

1
School of Mathematics and Leeds Institute for Fluid Dynamics, University of Leeds, Leeds LS2 9JT, UK
2
INRAE, UR ETNA, Université Grenoble Alpes, 38000 Grenoble, France
*
Author to whom correspondence should be addressed.
Water 2020, 12(3), 652; https://doi.org/10.3390/w12030652
Received: 10 January 2020 / Revised: 9 February 2020 / Accepted: 21 February 2020 / Published: 28 February 2020
(This article belongs to the Special Issue Challenges and Perspectives in Flood Risk Management and Resilience)
Inspired by the Boxing Day 2015 flood of the River Aire in Leeds, UK, and subsequent attempts to mitigate adverse consequences of flooding, the goals considered are: (i) to revisit the concept of flood-excess volume (FEV) as a complementary diagnostic for classifying flood events; (ii) to establish a new roadmap/protocol for assessing flood-mitigation schemes using FEV; and, (iii) to provide a clear, graphical cost-effectiveness analysis of flood mitigation, exemplified for a hypothetical scheme partially based on actual plans. We revisit the FEV concept and present it as a three-panel graph using thresholds and errors. By re-expressing FEV as a 2 m -deep square lake of equivalent capacity, one can visualise its dimensions in comparison with the river valley considered. Cost-effectiveness of flood-mitigation measures is expressed within the FEV square-lake; different scenarios of our hypothetical flood-mitigation scheme are then presented and assessed graphically, with each scenario involving a combination, near and further upstream of Leeds, of higher (than existing) flood-defence walls, enhanced flood-plain storage sites, giving-room-to-the-river bed-widening and natural flood management. Our cost-effectiveness analysis is intended as a protocol to compare and choose between flood-mitigation scenarios in a quantifiable and visual manner, thereby offering better prospects of being understood by a wide audience, including citizens and city-council planners. Using techniques of data analysis combined with general river hydraulics, common-sense and upper-bound estimation, we offer an accessible check of flood-mitigation plans. View Full-Text
Keywords: flood-mitigation assessment; cost-effectiveness analysis; holistic decision-making; flood-excess volume; citizen science flood-mitigation assessment; cost-effectiveness analysis; holistic decision-making; flood-excess volume; citizen science
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MDPI and ACS Style

Bokhove, O.; Kelmanson, M.A.; Kent, T.; Piton, G.; Tacnet, J.-M. A Cost-Effectiveness Protocol for Flood-Mitigation Plans Based on Leeds’ Boxing Day 2015 Floods. Water 2020, 12, 652.

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