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Nineteen Years later…. Lessons learnt from Kantale Breach. D W R Weerakoon Former Director General of Irrigation. KANTALE IRRIGATION SCHEME. Constructed early 7 th Century Restored in 1875 - 37,124 Acft Augmented in 1954 - 87,750 Acft 1965 -110,000 Acft Data Height of Dam - 60’

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nineteen years later lessons learnt from kantale breach

Nineteen Years later….Lessons learnt from Kantale Breach

D W R Weerakoon

Former Director General of Irrigation

slide2

KANTALE IRRIGATION SCHEME

  • Constructed early 7th Century
  • Restored in 1875 - 37,124 Acft Augmented in 1954 - 87,750 Acft 1965 -110,000 AcftData
  • Height of Dam -60’
  • BTW - 28’-50’
  • Side Slopes - 1:3 ~ 1:2.5
  • FSD - 42’
  • Spillway – Radial Gated 10/(15’WX8’H)
kantale dam failure sunday 20 th april 1986
Kantale Dam Failure (Sunday 20th April 1986)
  • First information IE/Army /AGA
  • Warning the Public

Police, Railway,CEB,NWS&DB

  • Efforts to reduce breach flow
prior warning of failure
Prior Warning of Failure

Prior Observation of signs of warning – none

Recent Prior inspection (24th Nov,1985)

- 65 runnels on D/S bund slope

-No seepage observed at 22’8’’ of water

-Bund overgrown

cause s of failure
Cause(s) of Failure
  • Failure of the LB sluice barrel
  • Deterioration of the sluice barrel
  • Effect of pile driving in close proximity for constructing the

pump house

damage caused
Damage Caused
  • Loss of Human life

- Dead bodies found 68

- Persons missing 59

  • No of families affected 2,035
  • No of persons affected 10,864
  • Houses damaged

-Completely 592

-Partially 628

  • Crop destroyed

-Standing crops 2,502 Ac

-Harvested 627 Ac

some issues related to kantale breach
Some Issues Related to Kantale Breach
  • Observation of signs of prior warning ?
  • Equipped for satisfactory level of observation ?
  • Periodic Inspection - satisfactory ?
  • Standing Orders- Available ? Updated ?
  • Disaster management
    • Planned ? Awareness ?
    • Communication methods-satisfactory ?
  • Authority with the custodian of the reservoir ?
  • ……? ? ? ?
post failure action
Post failure Action
  • Immediate inspection of 11 reservoirs by a team of specialists
  • Hazard Rating of Dams
  • ID Circular on regular inspection- check list & reports – 1986 June
  • Establishment of a dam Safety unit in ID – 1997
  • Preparation of standing Orders
  • Dam Safety Project under Mahaweli restructuring Project
dams under id responsibility
Dams Under ID Responsibility

Total 281

Concrete Gravity 01

Earth 280

Large dams 54

modes of embankment reservoirs failure
Modes of Embankment Reservoirs Failure

(Statistics– Global)

Source: ICOLD

issues for the present future
Issues for the Present & Future
  • Availability of Specialized Knowledge & Persons?
    • Prior Observations and capacity for inference ?

- Training needs

  • Equipment for satisfactory level of observation?
  • Periodic Inspections/Follow up action ?
  • Preparation and updating of Standing Orders ?
  • Preparedness for Disaster management
  • Communication methods-satisfactory ?
  • Authority with the custodian of the reservoir ?
  • Adequacy of funds