FLOOD RISK PREVENTION IN BARCELONA

Transcription

1 FLOOD RISK PREVENTION IN BARCELONA Water and land resilience: building the future of the Metropolitan Area 4 July 2016 Milan Environment and Urban Services Urban Ecology

2 Contents 1. Introduction 2. Flood risk management 3. Barcelona's drainage system. Constructing resilience 4. Real-time management and the flood warning system

3 01 Introduction

4 Introduction BARCELONA CICLE DE L AIGUA, SA (BCASA) Public Company: Municipal Start Operation: January 2014 Aim: Management of water cycle in Barcelona city Background: CLABSA ( ) experience in the transformation of urban drainage Drainage system Besòs River Hydrological Warning System Beach Warning System Groundwater uses Green areas watering Ornamental and drinking Fountains

5 02 Flood risk management

6 Flood risk management. Concepts Risk = Danger*Vulnerability(exposure) ACA Scheme Danger: probability of a flood occurring Vulnerability: quantification of how an element may be affected by a danger Risk: unfavorable contingency that someone or something is exposed to Inuncat Scheme Danger Assessment Vulnerability Assessment Risk Assessment

7 Flood risk management. Danger Assessment Establishing thresholds above which there is flood risk and flooding Maintaining intensity-duration-frequency curves up to date Producing rainfall risk maps with various return periods. Recalculating risk if the intensity-duration-frequency curves change

8 Flood risk management. Vulnerability Assessment Tangible Intangible Direct Physical damage to assets Deaths, injuries Indirect Loss of production, traffic disruptions Psychological trauma, increased vulnerability of survivors...

9 Flood risk management. Risk assessment Risk = Danger Vulnerability T1 T10 T100 T1 T10 T100

10 02 Barcelona's drainage system. Constructing resilience

11 Barcelona's drainage system. Features Combined system Length: km Accessible network: +50% Topography: Steep slope from Collserola to the sea Mediterranean climate: High-intensity storms High population density: 1.6M hab / 98km 2 High % of impermeable surface area Barcelona: CONSTRUCTING RESILIENCE IN THE WATER CYCLE

12 Barcelona's drainage system. Background Total length of beaches 4.5 km Combined Sewer overflow (CSO) Over 3,500,000 users in the summer of 2014

13 RESILIENCE CITY ELEMENTS Resilience Working Methodology 1. Detection of Risks 2. Evaluation of Risks 3. Evaluation of Resilience 4. Building Resilience City Resilience Profiling Programme from ONU- Habitat (April 2013) BARCELONA: BUILDING A RESILIENT CITY

14 Constructing a resilient drainage system 1. Risk detection 2. Risk assessment 3. Resilience assessment 4. Creating resilience MASTER PLAN The main instruments for developing the advanced management of urban drainage are: INFRASTRUCTURES AND INVESTMENT IN TECHNOLOGY Drainage Master Plan Real-time, centralised operation Technological systems for decision-making: o Territorial geographic information system (SIG) o System of numerical models o Telecontrol System REAL-TIME TELESUPERVISION

15 Environment and Urban Services Urban Ecology Barcelona's drainage system. Planning urban drainage Diagnosis Planning actions Prognosis Aims AIMS CURRENT DIAGNOSIS T = 10 YEARS 70% TSD reduction

16 Barcelona's drainage system. Urban drainage projects NETWORK MODEL Simulates the drainage network's operation and capacity

17 Drainage system. Current situation: Constructed rainwater-retention tanks. Torrent Espinagosa Parc de les Rieres in Horta Parc Central Nou Barris Zona Universitària Doctors Dolsa Bori i Fontestà Escola Industrial Urgell-Mallorca Joan Miró Diagonal Mar Taulat Fira 2 Porta Firal Parc del Poblenou Fòrum Storage capacity: 500,000 m 3

18 03 Real-time management and flood warning system

19 Real-time Management of Barcelona's Drainage System Objectives and base technology Aims To avoid floods To reduce discharges into the receiving environment To activate protection protocols in intenserainfall risk situations Knowledge of critical flood situations and reducing response times for protecting the general public Base technology Real-time information on the state of the drainage network and installations (waterlevel sensors, rain gauges, quality sensors, actuator status...) Automatic control applications in the installations Weather forecasting tools SMART SEWERS

20 Real-time management and flood-warning systems. Centralised operation. 13 RETENTION TANKS (+2) 29 PUMPING STATIONS 44 FLOODGATES 197 WATER-LEVEL SENSORS COMMUNICATIONS (RADIO, GPRS, 3G, BROADBAND, OPTIC FIBRE) 24 RAIN GAUGES Auxiliary sensors: 2,900 22

21 Real-time management and flood-warning systems. Centralised operation.

22 Real-time management and flood warning system. Operation during rain episodes. Weather forecast Radar Rain gauges Centralised operating system Real-time control system Territorial IT system Water-level sensors EMERGENCY LEVEL ( from 0 to 5 ) Modelling system CONTINUOUS MONITORING INTERVENTION PROCESSES Technical Co-ordinated by Retention tank and floodgate operation Network level control Operational Barcelona Police Informative Municipal Authorities Municipal Action Plans for Floods Fire Service / Civil Defence

23 Real-time management and flood warning system.

24 04 Conclusions

25 Barcelona's current drainage system The city of Barcelona is capable of resisting high-intensity storms (with a return period of approximately 10 years) without suffering flooding. Thanks to the flow regulation achieved by the retention tanks and a centrally operated system, the average of volume managed per year during rain episodes is 3,6 Mm 3. This prevents 833 Tm of suspended solids reaching the beaches. In the event of an emergency, the protocols are in place to ensure a coordinated response in order to return to normal as soon as possible BARCELONA: CONSTRUCTING RESILIENCE IN THE WATER CYCLE

26 Environment and Urban Services - Urban Ecology