Michaelobrienseanlynch

679 views

Published on

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
679
On SlideShare
0
From Embeds
0
Number of Embeds
2
Actions
Shares
0
Downloads
0
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Michaelobrienseanlynch

  1. 1. Impact of the November 2009 F I N Floods on the Water Infrastructure and Customer Service November 2009 presented by Michael O’Brien M.I.E.I., C.Eng. Senior Engineer cork city council and Sean Lynch M.I.E.I. Senior Executive Engineer cork city council
  2. 2. Rainfall Comparisons Nov 2008 Vs 2009 Cork Airport Ballyvourney Ballingeary Macroom Date November November November November November 2009 November November November 2009 2008 2009 2008 2008 2009 2008 Rainfall Rainfall Rainfall Rainfall Rainfall Rainfall Rainfall Rainfall Daily Total Daily Total Daily Total Daily Total Daily Total (mm) Daily Total Daily Total Daily Total (mm) (mm) (mm) (mm) (mm) (mm) (mm) 1 16.4 0.0 14.1 0.0 15.8 0.0 17.0 0.0 2 3.2 0.0 22.9 0.0 17.2 0.0 27.0 0.0 3 3.4 0.0 18.0 0.0 21.3 0.0 24.0 0.0 4 4.8 0.7 9.6 0.2 0.0 2.0 11.1 2.0 5 0.4 0.3 6.5 1.3 19.8 1.2 7.8 1.2 6 6.8 20.9 8.0 25.2 0.0 39.3 19.1 17.9 7 7.3 11.1 14.3 12.0 0.0 0.0 23.4 24.3 8 0.1 11.0 2.2 18.2 18.0 0.0 2.8 19.7 9 12.1 13.7 13.2 11.2 9.5 51.3 21.1 10.7 10 0.1 6.4 0.2 7.2 0.0 4.5 0.1 9.3 11 17.1 1.2 33.8 4.9 27.3 2.1 37.6 4.5 12 9.4 0.2 5.6 1.0 0.0 0.0 6.3 1.0 13 18.2 0.8 17.1 0.0 0.0 0.0 6.1 4.3 14 2.3 0.3 5.7 3.3 0.0 0.0 35.2 2.1 15 8.7 0.7 34.8 2.5 0.0 0.0 35.2 2.1 16 11.3 0.4 2.3 0.2 75.2 0.0 2.3 02
  3. 3. Rainfall Comparisons Nov 2008 Vs 2009 Date Cork Airport Ballyvourney Ballingeary Macroom November November November November 2009 2008 2009 2008 November November November November 2009 2008 2009 2008 17 7.2 1.0 22.0 6.7 34.8 7.9 21.9 7.0 18 12.5 0.0 55.4 0.1 0.0 6.8 67.3 0.0 19 51.2 0.0 37.8 0.2 111.0 0.1 35.4 1.8 20 0.1 0.0 23.4 5.0 0.0 2.5 27.1 4.5 21 16.1 1.5 9.5 5.2 0.0 0.0 15.9 2.7 22 4.3 0.1 19.2 3.0 64.5 0.0 21.7 2.5 23 8.1 6.3 10.1 12.2 0.0 19.2 11.0 7.4 24 8.9 0.3 16.0 1.0 34.5 1.5 17.4 1.4 25 4.9 49 0.0 00 8.5 85 0.0 00 0.0 00 0.0 00 11.6 11 6 0.0 00 26 2.0 0.1 9.7 4.0 20.3 7.2 14.9 5.0 27 8.1 2.4 4.8 1.2 0.0 0.0 4.7 2.1 28 0.0 0.0 0.1 0.0 0.0 0.0 0.3 0.0 29 0.2 0.0 2.0 0.0 8.5 0.0 0.5 0.0 30 0.0 0.0 4.7 0 7.1 0.0 4.0 0.0 Total 245.2 79.4 431.5 125.8 434.8 145.6 512.50 128.5
  4. 4. Rainfall Comparisons Nov 2008 Vs 2009 Location Total Rainfall Total Rainfall November 2009 (mm) November 2008 (m m) Cork Airport 245.2 79.4 Ballyvourney 431.5 125.8 Ballingeary 43 4.8 145.6 Macroom 512.5 128.5
  5. 5. Map Showing Rainfall Stations
  6. 6. Water Service Response Team (1) Located at Anglesea Street to: • Secure and maintain alternative water supply • Provide drinking and sanitary water • Ensure water quality is advised to customers
  7. 7. Water Service Response Team (2) Located at Lee Road Water Works to: • Repair and restore the water treatment plant
  8. 8. Civic Emergency Declaration • 19th nov 2009 unprecedented flooding 535m3 / sec Released • Property Damage • Flooding of public roads F • Public buildings • Cork City Council Water works • CRSIS DEEMED TO BE CIVIC EMERGENCY. RESPONSE AND PROCEDURES IN ACCORDANCE WITH CORK CITY COUNCIL EMERGENCY PLAN • Cork city council co--ordinated multi agency co response to include • Cork county council • Fire Service • HSE • Defence F D Forces • Garda Siochana • Civil Defence
  9. 9. Crisis coordination team • Established on 22nd nov 2009 replacing call centre Set up on 20th nov • To provide communication link to public in a dedicated multimedia room. • Free phone No activated on 23rd nov 2009 • 30 staff on roster basis from 08.00 to 22.00 7 Days for duration of emergency • Information management system modelled on M.E.P. • CCR liaised with :- :- Environment Roads R.A.C. Housing External Agencies Public CCR 3500 calls until Friday Dec 4th 2009
  10. 10. Crisis Co-ordinated Room (CCR) Co-
  11. 11. Media Liaison Team • Aim to provide regular updates and releases via City Council web site • To local , national press, radio, TV. etc. • 42 press releases / updates issued • Press releases included water distribution points, public welfare measures, measures boil water notices etc. etc • No of visitors 108,408 • No of pages viewed 342,99 342 99
  12. 12. Alternative Water Distribution • 70% of city served by lee road 90,000 people reduced to 50,000 With out water te • City council response plan to serve vulnerable population and institution with drinking water, sanitary water, using. • Tankers • IBC’s & Bowsers IBC s • Bottled water
  13. 13. Tankers • On site early afternoon 20th Nov 2009 at 6 locations • Water sourced at mahon and little island from cork county council water supply • Each tanker supplied by local co-op co- or contractor • Max No of tankers 32 • Filling time approx 30min • Tankers capacity 9500L to 30,000L
  14. 14. Tankers Drinking Water D D W Distribution (domestic Use Only) Q.C. • Each bulk tanker prior to use was steam washed and cleaned • Prior to dispatch water from each tanker was sampled and tested for chlorine residual • Water tested in lab for coliforms (total & faecal) f e ) • Consumers advised to boil water prior to drinking
  15. 15. Tankers : Tankers used to • Accompany fire tenders to fires • provide drinking water at designated locations ( max 15 ) • pump water to hospitals etc etc.
  16. 16. tankers Sanitary Water Distribution points (Institutions Use Only) • 27 No used @ 1200 litres capacity • Not fit for drinking
  17. 17. Bottled Water : • Sourced and distributed from 3.00pm on the 20th Nov. • Distribution point set up at kinsale road CAS • Supplied to :- Hospitals , Nursing Homes, Vulnerable Households, , institutions • Supplied by :- Cork City Council ,Civil Defence, , , Army, Garda,, Voluntary Groups • 300,000 Litres of bottled water was distributed during emergency
  18. 18. IBC’s & Bowsers Sanitary Water Distribution points (Domestic Use Only) • Approx 40 locations • Using 1000L intermediate bulk containers IBC’S • Operational from 8.00am to 8.00pm from 22nd Nov 2009 • Dedicated tankers to fill these • Water not suitable for drinking
  19. 19. Operation School Run To have all schools back before Monday 30th Nov 2009 • Dedicated team of plumbers reporting e e t to Ex. Engineer C.C.C • Contacted 30 schools • Filled school water tanks using dedicated tankers supplied by campions with pumps & hose reels
  20. 20. Operation School Run
  21. 21. Lessons Learned • Importance of multi agency coordinated response • Manning distribution points good P RP.R. • Establishment of public confidence early very important No panic No draw off • Materials on ground earlier than needed • Strategic importance of tankers • What would have happened if the event accoured in summer • Importance of website as a communications tool •NNeed to install dry risers in schools, hospitals etc. to facilitate easy filling of water tanks
  22. 22. Cork City's response to the flooding City s and water crisis of November 2009 Restoration of Lee Road Water Works andd Drinking Water to the Mains Network
  23. 23. Cork City's response to the flooding City s and water crisis of November 2009 Water Works and Distribution System • Water Works Plant is located at the Lee Road • It abstracts and treats approximately 46,000 m3/day from the River Lee • Operates 24 hours / 7 days a week • It accounts for 70% of the City Councils water customers • The remaining 30% is served by the County Council plant at Inniscarra
  24. 24. Cork City's response to the flooding City s and water crisis of November 2009 Water Works and Distribution System • Treated water is pumped to 4 reservoirs located on the higher ground at the North West of the City • Low Level – Shanakiel - 76m O.D. • Intermediate Level – Harbour View - 118m O.D. • High Level – Knocknaheeny – 145m O.D. OD • High Level Tower – Knocknaheeny – 161m O.D.
  25. 25. Location Map
  26. 26. Cork City's response to the flooding City s and water crisis of November 2009 Water Works and Distribution System • Water is distributed by gravity without additional pumping • Approximately 650 km of distribution network • Pipe types include Ductile Iron, Cast Iron & Steel up to 800mm diameter • the City is divided into 48 DMA’s (District Meter y ( Areas) covering 45,500 property connections
  27. 27. Cork City's response to the flooding City s and water crisis of November 2009 Water Works Shut Down • The decision was made to shut down the Lee Road Water Works due to – likelihood of rising water levels reaching the g g electrical switch gear – the risk of contamination to the public water supply • All power to the plant was confirmed to be off by the Senior Electrician at 3:40 am 20th November
  28. 28. Photos showing flooding extent g g • Plant under water • Plant after pump out
  29. 29. Cork City's response to the flooding City s and water crisis of November 2009 Pumping out flood water • The Fire Service Army Navy and Civil Defence were Service, Army, on site to assist the Council personnel • Flood levels had receded sufficiently by Friday afternoon 20th to allow access to the plant • Pumps were delivered and pumping out commenced • Over 14 different pumps were put into operation p p p p • They varied in size from 12 inch down to 3inch • Pumping was substantially completed on Sunday 22nd
  30. 30. Cork City's response to the flooding City s and water crisis of November 2009 Removal of Water Works Pumps • As the water levels dropped the various electrical equipment were removed for repair / replacement • A specialist electrical contractor, Bolomore Enterprises Ltd., was employed to carry out this work • Raw Water Intake Motors were removed on Saturdayy • Sunday they started removing the main pump motors for the rising mains • There were 17 large motors to be removed and restored
  31. 31. Cork City's response to the flooding City s and water crisis of November 2009 Removal of other electrical equipment • The likelihood of the motors being restored was higher due to the fact that they were older (1970’s – 80’s) • The motors were transported to Dowling Electrical in Millstreet for refurbishment, including 2 days oven drying • High and Low voltage switchgear removed for repair • High Voltage Circuit Breaker sent to UK for repair but had to be replaced • Various dosing and mixing pumps required removal and overhaul
  32. 32. Cork City's response to the flooding City s and water crisis of November 2009 Restoration of electrical equipment • At the same time work was ongoing to remove any sludge from the raw water pump house and the pure water basin. The pump house brushed and hosed down. • Tuesday 24th - Two Raw Water Pumps were installed and started • Initially this water was put through the settlement y p g tanks to the filter beds and let run to waste • A temporary chlorination dosing system was setup to disinfect the pure water basin. Water was dosed at p 30mg/litre before entering the pure water basin
  33. 33. Cork City's response to the flooding City s and water crisis of November 2009 Restoration of electrical equipment • Wednesday 25th - Two Low Level Pumps installed and started along with dosing and backwash motors • Thursday – One Intermediate Level Pump installed and started d t t d • Friday – One High Level Pump installed • Saturday – Started high level pump
  34. 34. Cork City's response to the flooding City s and water crisis of November 2009 Scouring and Filling 1st R S i d Filli Reservoir – L i Low Level L l • Wednesday 25th – The Pure Water Basin emptied after disinfection • Old Filter Beds No.’s 7 to 14 used to fill Pure Water Basin • Started pumping water to the low level reservoir with Chlorine dosed at 2mg/litre Chlo ine 2mg/lit e • 900m3 scoured from the reservoir to waste • Reservoir filled over night • Water tested for chlorine near the outlet of the reservoir – 1 mg/litre • Public were notified of Boil Water Notice • HSE approval received for distribution of water on Friday 27th – 7 days after shut down
  35. 35. Cork City's response to the flooding City s and water crisis of November 2009 Intermediate and High Level Reservoirs • Similar procedures followed for both the Intermediate p and High Level Reservoirs • Saturday 28th clearance received for Intermediate Level Reservoir ready for water distribution • Sunday 29th clearance received for High Level Reservoirs ready for water distribution
  36. 36. Cork City's response to the flooding City s and water crisis of November 2009 Response to Conserve Water Supplies • Th was approximately a day’s water supply but we There i t l d ’ t l b t did not know how long the plant would be out of production • 4.30 am Friday 20th , in order to conserve supplies for the critical institutions, mainly Hospitals, the supplies to DMA’s without Hospitals were shut off. p • At 7:10 am a press release was issued listing the Main Areas with Disruption to Drinking Water Supply
  37. 37. Cork City's response to the flooding City s and water crisis of November 2009 DMA’s that retained City Water Supplies • High Level DMA s – 3 out of 9 DMA’s left on DMA’s DMA s Trunk + West + South West – Orthopaedic Hospital • Intermediate Level DMA’s - 2 out 6 DMA’s left on. Trunk + South East – St. Patrick's Hospital • Low Level DMA’s – 2 out of 11 DMA’s left on SA Trunk – South Infirmary + Saint Finbarrs Hospital Middle C Trunk – Mercy Hospital • Bons Secure + Cork University Hospital y p On County Supplies - not effected
  38. 38. Map of DMA’s Initially Shut Off Cork City's C k Cit ' response t the flooding to th fl di and water crisis of November 2009
  39. 39. Cork City's response to the flooding and water crisis of November 2009 d t i i fN b • I id Room set up at the Incident R h Water Management Office on Anglesea Street • Co-o d at o of all ate Co-ordination o a water supplies plus the reconfiguration of water network by the Water Response Teams p • Manned 7 days a week from 7:30am to 9:00pm • Daily meetings held to disseminate information between all parties internal & external
  40. 40. Cork City's response to the flooding City s and water crisis of November 2009 Work organised from Water Incident Room • Response teams from various departments assigned duties – Distribution of water and pressure checking – Locations for Standpipes & manning for public access – Locations for Sanitary Water Units – Securing Tankers, Bottle Water and Sanitary Water Tanks, Tanks there operation / maintenance / distribution – Tanker filling & their distribution – Water for Schools to re-open re- p – Testing of tanker water for domestic use
  41. 41. Cork City's response to the flooding City s and water crisis of November 2009 Work organised from Water Incident Room • Once the water returned to the system staff organised – Filling the Distribution Network in a controlled manner minimising the risk of breaks – Fl shing discoloured water from the network Flushing discolo ed ate f om net o k – Pressure checking to ensure the network was charged – Testing water for boiled water notice to be lifted – Clearing blockages on service connections for restored water supplies
  42. 42. Cork City's response to the flooding City s and water crisis of November 2009 Alternative Water Supply for City Centre • A recent connection to the County water main network was id tifi d as a significant alternative water supply identified i ifi t lt ti t l • The connection comes from North Esk in the County into Tivoli Docks capable of feeding the City centre p g y island • The existing main to the city centre is liable to breaks from shock loadings therefore the main was turned on slowly over a 24 hour period starting at 11am Friday morning • It supplied 240m3/hr to the city centre area
  43. 43. Cork City's response to the flooding City s and water crisis of November 2009 Other County Water Supplies Points • 3 existing Cork County Council supply points located on the South Side of the City – Ardrostig – Chetwynd – Mahon • 2 addition supply points were identified dditi l i t id tifi d – Douglas Road – Kinsale Road
  44. 44. Cork City's response to the flooding City s and water crisis of November 2009 Additional County Supply Points - South Side • Douglas Road connection - sufficient to supply water to the S th th Southern A Area South W t DMA S th West – 5,500 Population – 2,100 Households • The Kinsale Road connection boosted existing County supplies to enable water to reach 3 of the higher Low Level DMA’s that were shut off – 3,200 Households , – Booster NE1 – Booster NE2 – SA West Resulted in reduced pressures at high points
  45. 45. Cork City's response to the flooding City s and water crisis of November 2009 Night Time Water Supplies • Mahon supply had sufficient capacity to feed further in towards the city centre • It had insufficient capacity to feed SA Trunk and SA Central during the day due to their topography and a small diameter pipe network • There was sufficient capacity for night time supplies these DMA’s • Supplied 9pm and 7am each night • Allowing there tanks to fill over night
  46. 46. Cork City's response to the flooding City s and water crisis of November 2009 Hydrant Standpipe Water Supply Points • Hydrant locations were identified in areas with water close the boundary of areas without • 6 hydrant standpipes were provided at locations that would not cause a hazard • Suitable for vehicles to park nearby • Signs erected for users to boil the water • 2 council personnel manned each hydrant 8 am to 8 pm 7 days / week • This had the advantage of providing information to the public and prevent abuse of the system
  47. 47. Cork City's response to the flooding City s and water crisis of November 2009 Restoration of Piped Water Supplies • The Boil Water Notice was limited to North of the North Channel of the River Lee, with HSE approval, because there was no water in mains for up to 7 days + avoiding any confusion for the public p • Friday 27th - Low Level Reservoir was gradually opened • First section of the network was filled • Personnel deployed to scour discoloured water from system at hydrants • Allowed release of air plus monitoring the water progressing through the network • Network filled in a controlled manner filling section by section
  48. 48. Cork City's response to the flooding City s and water crisis of November 2009 Testing Restoration Water Supplies • Water Samples taken by the Laboratory staff at consumers premises • Bacteriological and residual chlorine test were carried out • Same locations sampled on 3 consecutive days • HSE criteria for lifting the Boil Water Notice was 3 clear test results • To avoid confusion the Boil Water Notice was left in place until all north side areas were clear • Due to size of the area involved HSE agreed 3 samples per DMA carried out by the Council • The HSE carried out additional testing
  49. 49. Cork City's response to the flooding City s and water crisis of November 2009 Restoration of Water Supplies to DMA’s • Similar procedures for Intermediate & High Level Reservoirs • Restoration was substantially complete North of the River by Sunday evening 29th • A team of plumbers were employed clearing blockages and air lock in service connections • HSE lifted the Boil Water Notice on Wednesday 2nd y December • Water restored to the 2 DMA’s South side with night time supplies with out the need for a boil water notice due to water being present in the mains and replaced nightly
  50. 50. Cork City's response to the flooding City s and water crisis of November 2009 Restoration and Improvements On-going On- • County Council Supplies returned to normal levels as the Lee Road Water Treatment Plant capacity increased • The last additional supply was closed on 23rd December and DMA Boundaries were restored to there original formation B d i t d t th i i lf ti • The repair of the flow meters and pressure reducers damaged are on going, delayed due to the recent cold going weather spell • The Treatment plant returned to full capacity early in 2010

×