1 Item 10 DUBLIN CITY RISK FACTORS DUBLIN CITY RISK FACTORS - PDF document

Item 10 PRESENTATION Dublin City Council – Introduction – Presentation City Council September 2009 Novem ber 2 0 1 1 – Dublin Flooding Initiative – National Issues – Flood Risk Management – Design Standards/ Building Standards Floo ood Risk in d Risk in Dublin Dublin – Framew ork for Emergency Management – Local Authority Interim R Interim Repor port on t on Extr Extreme eme Pluvia Pluvial l – Resources th October th O t b Fl Fl Floo Fl oodi ding di ng ev event 24 t 24 th t t 24 th er 2011 2011 2011 2011 – Health & Safety – Flood Alert 24 th October 2011/ Drainage Assessment Tom Leah m Leahy – Resource deployment Execu cutiv ive M e Manager er (E (Engineer neering ing) – Emergency Response – Geographical Distribution of flooding – Case Study Camac River – Key issues/ next steps FLOODING OODING – MANY CAUSES – RAINFALL – RIVERS – COASTAL – DAM BREAK – INFRASTRUCTURE FAILURE INFRASTRUCTURE FAILURE – ETC. – MANY INFLUENCING FACTORS – GLOBAL WARMING – EXTREME EVENTS – STORMS Brief review of detailed presentation given to City Council in September 2009 – TIDAL SURGE – ETC. RIVERS DUBLIN CITY RISK FACTORS DUBLIN CITY RISK FACTORS 3 MAIN RIVERS • TOLKA COASTAL • LIFFEY • DODDER MANY SMALL RIVERS (UNDERGROUND) • WAD • PODDLE PODDLE • CAMAC • +++ 1

Item 10 DUBLIN CITY RISK FACTORS DUBLIN CITY RISK FACTORS PLUVIAL (MONSTER RAIN) DAM BREAK DUBLIN CITY RISK FACTORS Dublin’s changing coastline 1821 Present 1948 1876 1925 1756 1170 - 1570 Scandinavian Dublin Gaelic Dublin Medieval Dublin 1728 INFRASTRUCTURE FAILURE Much of Dublin once under the Much of Dublin once under the sea sea And could be again in future And could be again in future Unique features w hich facilitated Unique features w hich facilitated Unique features w hich facilitated Unique features w hich facilitated grow th over the centuries grow th over the centuries – on the coast – on the coast - flat land - flat land - many rivers for water supply - many rivers for water supply now pose threats due to climate now pose threats due to climate change change PRESENTATION – Introduction – Presentation City Council September 2009 – Dublin Flooding Initiative Dublin Flooding Initiative – National Issues – Flood Risk Management – Created after flooding (Coastal and River) 2002. – Design Standards/ Building Standards – Modelled on Dublin Transportation Initiative (DTI) – Framew ork for Emergency Management – Up to 1990’s Transportation planning was based on – Local Authority building more and more Roads to address growth of Cars. – Resources – Unsustainable. – Health & Safety – Flood Alert 24 th October 2011/ Drainage Assessment – Dublin Flooding Initiative – Use of Sustainable Drainage Systems. – Resource deployment – Creation of “Room for the River” – Emergency Response – Creation of “Room for the rain” – Geographical Distribution of flooding – Central Theme of EU “ Flood Resilient Cities” – Case Study Camac River Project – Key issues/ next steps 2

Item 10 Dublin’s Flood Initiative – short & Dublin Flood Initiative - 5 HAZARDS require 5 STRATEGIES: medium term capital investment(2009) Dams Rivers Pluvial Drainage Coastal Defences at risk from 1/200YR High Tide (Astro +Surge):- = at risk but protected Review River Alleviation: FRCSPS GDSDS DCFPP TOLKA FLOOD PROTECTI ON = at risk and requiring further protection SCHEME (Completion 07/ 08) As 1976 UK Reservoirs Act FloodResilienCity Strategic Greater Dublin Strategic Dublin Coastal Flooding = additionally at risk from Wave Action Over a number of years. Pluvial Study. Drainage Study. Protection Project. On main rivers. Dam Safety: Liffey / Tolka / Dodder . EU FRC Project: EU SAFER Project: Dam Improvements at: Regional Study: S2S PROMENADE & CYCLEWAY • Bohernabreena; Modelling. Regional Study: CFRAMS (Feasibility 07/ 08) • Vartry & Code of practice. Coastal & estuary analysis. OPW bringing all rivers to CLONTARF WATER MAI N & SEA • Stillorgan. CFRAMS standards. SUDs Flood forecasting system DEFENCES (Planning/ Procurement 07/ 08) Dam Extreme Operation: Training. New Defences schemes. Inter agency ESB/DCC New response procedures. Operating procedures in Flood Atlas. COASTAL FLOOD respect of Liffey dams. FORECASTI NG SYSTEM Expansion of catchment, (I nternal Trials 06/ 07) reservoir; and river SPENCER DOCK RESTORATI ON (Construction 07/ 08) monitoring. LI FFEY CATCHMENT OPERATI ONAL PLAN BOARD WALK DUTCH SPENCER DOCK ADVANCED (Study? 07/ 08) DAMS (Constructed 05) WORKS (Constructed 05) DOCKLANDS I NI TI ATI VE DOCKLANDS I NI TI ATI VE DOCKLANDS I NI TI ATI VE DOCKLANDS I NI TI ATI VE (VI SI ON FOR DUBLI N BAY) (VI SI ON FOR DUBLI N BAY) BUS LANE & SEA DEFENCES (Feasibiity 07/ 09) CAMPSHI RE I MPROVEMENT SCHEME (DDDA) DODDER EMERGENCY DODDER ESTUARY WORKS (Constructed 04) WORKS (Construction 07/ 08) POOLBEG I NI TI ATI VE POOLBEG I NI TI ATI VE OPERATI ONAL DEMOUNTABLE DEFENCES (As Situations Dictate) S2S PROMENADE & CYCLEWAY (Planning 07/ 08) DODDER CATCHMENT MANAGEMENT PLAN (Study 07/ 08) Pluvial study is the Pluvial study is the remaining component in remaining component in MERRI ON GATES DEFENCES the DFI the DFI (Construction 07/ 08) Strategy Strategy BOHERNABREENA DAMS I MPROVEMENTS (Constructed 06) Tony Maguire, Dublin City Council The philosophy of Sustainable Urban Drainage Systems Example of Sustainable Program Implementation Source (SuDS )is to try and replicate the natural drainage that -Philadelphia (combined Storm Overflow (CSO) would have occurred prior to development Waste Collect Porous Pavements (Example of SUDS) – Stormwater tree trenches A type of pavement that allows rain or snowmelt to pass – Green Roof through it. Use Treat Sidewalks & – Rain barrel Walkways – Pervious paving – Bump outs – Flow-through planters Flow through planters Parking Lots – Stormwater planters – Rain gardens – Stormwater wetlands Driveways & Patios Included in City Development Plan – No controls yet on paving gardens in Dublin Region – Discharge stormwater into drains never built to take this stormwater – Contributor to flooding 200 YEAR OLD DRAINS NEVER DESIGNED FOR URBANISATION 3

Item 10 Dublin Rain Fall Duration Patterns: 90 1:100 yr Dublin Highest 1 Hr Ever Recorded 1:50 yr mm which fell in period opposite 80 Impractial to "Retro ‐ Fit" Increased Capacity to 1:30 yr existing Drainage Systems. 70 Must look to managing surface water flows at 1:20 yr ground level ‐ "Exceedance Modelling“ 1:10 yr SUDS Applications 60 1:5 yr 1:2 yr 50 1:1 yr August 2008 July 2009 July 2009 Amount of Rain in 40 1:0.5 yr Oct. 2002 63ObsBallsbridge 30 02ObsDonnybrook 08Observed 20 Room for the River 09ObsBotanic 10 09ObsAirport and the Floodresiliencity project 09ObsPhoenix 0 0 60 120 180 240 300 360 09InferredBotanic Period in Minutes Who we are: 8 cities and 2 universities • Bradford (UK) What is FRC? • Brussels (BE) Making cities in North West Europe more • Dublin (IR) flood resilient • Leuven (BE) • Mainz (DE) Mr. Ingwer de Boer • Nijmegen (NL) Program director Room for the River • Orléans (FR) Orléans (FR) • Paris (FR) - Who we are • City of Paris - What we aim at Engineering School (FR) • University of Sheffield (UK) New approach towards flood protection Recent European floods The serious flood risks in 1993 and 1995 were a warning signal: something ~Floods in Italy: Venice and Rome (2008) had to be done. ~Floods in the United Kingdom, Italy, Switzerland and Germany (2007) Reinforcement of dykes was not enough: ~Floods in Bulgaria, Germany, France, Austria and Romania (2005) rivers had to be given more room to ensure flood-safety in the future ~Danube and Elbe floods (2002) The Ministry of Transport, Public Works and Water Management has ~Floods in France (Coastal) (2010) developed the programme ‘ Room for the River’ developed the programme Room for the River ~Floods in Poland, Hungary and Slovakia (Fluvial, Pluvial) 2010 Floods in Venice 4

Item 10 The programme consists of 39 measures The two goals of Room for the River 11. Increase flood-safety 2. Improve spatial quality 2. Improve spatial quality Introduction Nijmegen Nijmegen - Old A new attitude towards our safety “Room for the River” 5

Item 10 Nijmegen - New Nijmegen - Old Nijmegen - New “Room for the River Waal” Aim: “To protect Nijmegen and its hinterland from future floods and increase the spatial quality” Figures: – Displacement of 50 household – Costs: EUR 365 mio – Area: 250 hectares – Ready: around 2015 PRESENTATION – Introduction – Presentation City Council September 2009 – Dublin Flooding Initiative Working Together – National Issues – Flood Risk Management – Design Standards/ Building Standards – Framew ork for Emergency Management – Local Authority – Resources – Health & Safety – Flood Alert 24 th October 2011/ Drainage Assessment – Resource deployment – Emergency Response – Geographical Distribution of flooding – Case Study Camac River – Key issues/ next steps 6