Risk management of urban rain events in a coastal city. The case of Marseille
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1 Risk management of urban rain events in a coastal city The case of Marseille Jean Claude GONDART General Secretary of the municipality of Marseille Dominique LAPLACE Manager engineering department SERAM
2 5 th International Conference on Sustainable Techniques and Strategies in Urban Water Management 5 e Conférence Internationale sur les Techniques et Stratégies Durables pour la Gestion des Eaux Urbaines par temps de pluie
3 North Marseille : 1 million inhabitants 5 th International Conference on Sustainable Techniques and Strategies in Urban Water Management 5 e Conférence Internationale sur les Techniques et Stratégies Durables pour la Gestion des Eaux Urbaines par temps de pluie
4 North Beaches Shape of a basin of 250 km 2 Surrounded by mountains Beaches 5 th International Conference on Sustainable Techniques and Strategies in Urban Water Management 5 e Conférence Internationale sur les Techniques et Stratégies Durables pour la Gestion des Eaux Urbaines par temps de pluie
5 North Torrential rain in autumn 5 th International Conference on Sustainable Techniques and Strategies in Urban Water Management 5 e Conférence Internationale sur les Techniques et Stratégies Durables pour la Gestion des Eaux Urbaines par temps de pluie
6 North Rain water network 500 km of storm drains 50 km of Rivers Operated by SERAM 5 th International Conference on Sustainable Techniques and Strategies in Urban Water Management 5 e Conférence Internationale sur les Techniques et Stratégies Durables pour la Gestion des Eaux Urbaines par temps de pluie
7 North Beaches Two main problems : Beach pollution Flooding Beaches 5 th International Conference on Sustainable Techniques and Strategies in Urban Water Management 5 e Conférence Internationale sur les Techniques et Stratégies Durables pour la Gestion des Eaux Urbaines par temps de pluie
8 Main Actions - New developments - Rainwater network maintenance - Surface sealing regulation - Public information - Real time risk management 5 th International Conference on Sustainable Techniques and Strategies in Urban Water Management 5 e Conférence Internationale sur les Techniques et Stratégies Durables pour la Gestion des Eaux Urbaines par temps de pluie
9 Urban flooding River overflows Street runoff
10 Maps of flooding risk in Marseilles Rivers flooding areas Dangerous street runoff 5 th International Conference on Sustainable Techniques and Strategies in Urban Water Management 5 e Conférence Internationale sur les Techniques et Stratégies Durables pour la Gestion des Eaux Urbaines par temps de pluie
11 Urban watersheds have a rapid reaction time Flash floods Time to act is very short, for the crisis management it is necessary to make a decision before it rains on the city We have to anticipate by assessing the «potential risk» of rainstorms coming towards the city
12 Rain forecast and monitoring Lightning monitoring Satellite images Rain monitoring radar 24 Rain gauges 24h SERAM Operator Sewer system supervising Monitoring Center
13 Transformation of the rain predicted into risk level Total Rainfall - Intensity - Danger Total rainfall in mm Light rain A B M.A.P. D 1 C Medium to heavy rain M.A.P. 2 Very heavy rain Maximum rainfall Intensity in mm/h
14 Curves Total Rainfall - Intensity - Danger Rain drainage network management Total rainfall in mm D C B A Maximum rainfall Intensity in mm/h Right organisation for assistance and rescue
15 Dry weather and Light rain level A Risk = Beach pollution Objective : Treatment of waste water and first runoff Actions : Sewer network monitoring, remote control of gates In case of discharge : Informing of municipal authorities Bathing prohibition - Samples and bacteriological analyses
16 Medium to Heavy rain : Levels B, C, D Risk = «flooding points» Objective : To reduce flooding and their effects Actions : Retention basin regulation, Opening of discharge pipes Setting up of a telephone system for public calls reception, 3 levels crisis management with SERAM staff in the field, Informing municipal authorities and raising of the M.A.P. by the DEA Security services, fire brigade and police
17 Heavy and Very Heavy rain : Level > D Risk = Dangerous flows in the streets Objective : Public safety Actions : Retention basin regulation, Opening of discharge pipes Telephone system for public calls reception, SERAM staff in the field, Informing municipal authorities and raising of the M.A.P. by the DEA Security services, Fire Brigade, Police, Schools information, Public information by the security councillor
18 An example : September, 19 th h00 Meteo-France Forecast : Stormy weather for the afternoon Total rainfall predicted : 40 à 60 mm Intensity predicted : 50 à 70 mm/h
19 Total rainfall in mm Total Rainfall - Intensity - Danger D C B A Maximum rainfall Intensity in mm/h
20 10h00 Raising of a risk level D Putting on call of 120 SERAM workers Informing of local authorities, Raising of Municipal Assistance Plan Mobilisation of Fire brigade and Police
21 Relation Pluie-Danger Radar Rain monitoring by Radar A Marseilles B C D 15h00 Storm cells
22 Relation Pluie-Danger Radar A B C D 15h30 Risk level C to D Predicted path
23 Relation Pluie-Danger Radar A Raising of alarm level D and MAP Spreading of intervention staff in the city B C D 16h00
24 Relation Pluie-Danger Radar A B C D 16h30
25 Relation Pluie-Danger Radar A B C D 17h00
26 Relation Pluie-Danger Radar A B C D 17h30
27 Relation Pluie-Danger Radar A B C D 18h00
28 Relation Pluie-Danger Radar A B C D 18h30
29 Relation Pluie-Danger Radar A End of alarm B C D 19h00
30 It is now possible to do early warning : - to make preventive management - to inform the municipal authorities when necessary
31 A useful decision making system for Municipal Authorities - Allows anticipation of a crisis and organisation of an assistance plan - Allows the population to be informed when necessary
32 Outcome concerning beach pollution risk : Discharge reduction by remote control of gates Bathing is forbiden if pollution is suspected Bathing is allowed when the conditions are good
33 Outcome concerning the flooding risk : Flooding reduction by remote control of gates Management of intervention teams Security of children in the schools Giving caution advices to the population Closing of dangerous streets and underground spaces Evacuation of dangerous zones
34 Helps the mayor in his information, rescue and assistance role Develops a risk awareness approach An example of Public / Private partnership
35 Progress axes: Construction of m 3 of retention basin in the town center in order to prevent beach pollution and flooding, Automatic calls for public warning in dangerous zones. Thank you for your attention!
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