Defence Measures in Flood Risk Assessment: A Case Study

Defence Measures in Flood Risk Assessment: A Case Study

D. de Wrachien S. Mambretti 

Department of Agricultural Engineering, State University of Milano, Italy

DIIAR, Politecnico di Milano, Italy

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Flood defense is a problem of vital importance, for which knowledge and advanced scientific tools play a paramount important role in the strain of coping with flooding problems. In this context, flood model-ing represents the basis for effective flood mitigation measures. By using models, an attempt is made to replace trial-and-error-based strategies, as practiced in the past, with more physically based measures of flood management and control. Mathematical models are the best tools, nowadays available, for the design of efficient flood protection strategies and excellent supporters of decision-makers. With refer-ence to these issues, the paper provides a complete application of the procedures, nowadays available, for risk assessment, from catchment to a very local scale, on the Lambro River in Milano, Italy. It is shown that social and political constraints may force risk managers to find different solutions to solve the problems they have to face, which may be related to non-hydraulic issues.


case studies, early warning, fl ood hazard, mathematical models


[1] Schultz, B., Opportunities and threats for lowland development. Concepts for water management, flood protection and multifunctional land-use. In: Proceedings of the 9th Inter-Regional Conference on Environment-Water. EnviroWater 2006. Concepts for Watermanagement and Multifunctional Land-Uses in Lowlands, Delft, the Nether-lands, pp. 17–19 May, 2006.

[2] Dam, JC van. (ed), Impacts of Climate Change and Climate Variability on Hydrologi-cal Regimes. Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, p. 140, 1999.

[3] De Wrachien, D., Mambretti, S. & Schultz, B., Flood management and risk assess-ment in flood-prone areas: measures and solutions. Irrigation and Drainage, 60(2), pp. 229–240, April 2011.

[4] Meadcroft, IC, Reeve, DE, Allop, NWH, Diment, RP, J.E. Clifford. & Cross, J., Devel-opment of new risk assessment procedures for coastal structures. Advances in Coastal Structures and Breakwaters, ed. T. Thelford, Heron Quay, London, pp. 6–25, 1996.

[5] Brown, M. Situazione attuale e interventi prioritari per la salvaguardia del territorio del Comune di Milano in U. Maione & A. Brath (eds), La difesa idraulica dei territori fortemente antropizzati, 1997. (in Italian)

[6] De Wrachien, D., Mambretti, S. & Sole, A. Mathematical models in flood manage-ment: overview and challenges. Second International Conference on Flood Recovery Innovation and Response, Milan, Italy, pp. 61–72, 26–28 May 2010. doi: http://dx.doi. org/10.2495/FRIAR100061

[7] La Montagna, G. The hydraulic safeguard of the city of Milan: the Canale Scolmatore di Nord-Ovest,  Risk Analysis VII, eds C. Brebbia & C.N. Brooks, WIT Press: UK, p. 960, 2010.

[8] Wallingford, HR. Flood Risks to People Phase 1. Final Report Prepared for Defra/Envi-ronment Agency Flood and Coastal Defence R&D Programme, 2003.

[9] Priest, S. (Lead Author) Building models to estimate loss of life for fl ood events. Execu-tive Summary, Report N. T10-08-10, the Hague, the Netherlands, 2009.

[10] Viscusi, W. & Zeckhauser, R., National survey evidence on disasters and relief: risk be-liefs, self-interest and compassion. Journal of Risk and Uncertainty, 33(1), pp. 13–36, 2006. doi:

[11] Mullins, A. & Soetanto, R. Investigating the relationship between perceptions of social responsibility and community resilience to flooding: a definition, context and method-ology. Second International Conference on Flood Recovery Innovation and Response, Milan, Italy, pp. 293–304, 26–28 May 2010.

[12] Autorità di Bacino del Fiume Po. Linee generali di assetto idrogeologico e quadro degli interventi. Bacino del Lambro. Parma, 2003. (in Italian)

[13] Bascapè, G.C. Il naviglio di Milano e gli antichi canali lombardi Cisalpino-Goliardica, p. 125, 1977. (in Italian)

[14] Autorità di Bacino del Fiume Po Piano Stralcio delle Fasce Fluviali Parma, 1997. (in Italian)

[15] De Wrachien, D., Mambretti, S., Mathematical models for flood hazard assessment. Journal of Safety and Security Engineering, 1(4), December 2011.

[16] Garcia-Martinez, R., Gonzalez-Ramirez, N. & O’Brien, J., Dam-break flood routing (Chapter 4). Dam-break. Problems, Solutions and Case Studies, eds D. De Wrachien, & S. Mambretti, WITPress: Southampton, p. 334, 2009.

[17] FLOW-3D User Manual – Ver. 9.4. Flow Science, Inc., Santa Fe, New Mexico, 2009.

[18] De Wrachien, D., Garcia-Martinez, R. & Mambretti, S. Mathematical models for flood and debris flow routines. 39th International Symposium on Actual Tasks on Agricultural Engineering, Opatija, Croatia, 22–25 February 2011.

[19] U.S. Army Corps of Engineer HEC RAS River Analysis System Hydraulic Reference Manual, Version 4.1, January 2010.

[20] Molinari, D. Flood early warning systems performance: an approach at the warning chain perspective, PhD Thesis, Politecnico di Milano, Italy, 2011.

[21] Parker, D.J., Priest, S.J. & Tapsell, S.M. Understanding and enhancing the public behavioural response to flood warning information. Meteorological Applications, 16, pp. 103–114, 2009. doi:

[22] FLOODsite Modelling the damage reducing effects of fl ood warnings–fi nal report, FLOODsite Project Report, Number T10-07-12, March 2008.