national water supply & drainage boardnational...
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National Water Supply & Drainage BoardNational Water Supply & Drainage Board
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Role of NWSDB D ti W t S t C &Domestic Water Sector Coverage & TargetsNational Policy on Drinking WaterDrinking Water SourcesDrinking Water Sources Lessons Learned The Way ForwardDreamDream ………….
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Operation and maintenance of urban and small town waterOperation and maintenance of urban and small town watersupply systems and waste water systems
Project formulation and developmentIdentificationPlanning and Master PlanningPlanning and Master Planning Pre‐Feasibility & Feasibility Studies
Execution and implementation of water supply/waste waterExecution and implementation of water supply/waste waterprojects
Urban water supplyUrban water supplyUrban and Industrial waste waterRural water supply and Sanitation
Providing technical assistance and guidance to LocalAuthorities and Community Based Organizations (CBOs)
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34 0 %
56.5 %
34.0 %
9.5 %
Piped Water Supply Coverage by NWSDB Water Supply Schemes
Piped Water Supply Coverage by CBOs & Local Authorities
Population not covered by Pipe Borne Water Supply Schemes
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80%
90%
100%
60%
70%
80%
Piped Water Supply Coverage by CBO, LA & Other55.7 %
41.1 %45.8 %
51.6 %
37 4 % 38 6 %40%
50%
60% Other
Piped Water Supply
22.9 % 24.7 %
37.4 % 38.6 %
20%
30%
Piped Water Supply Coverage by NWSDB
7.7 %
0%
10%
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Millennium Development Goals (MGDs)
Safe Water Supply Remains a Challenge in many parts of the world ……including Sri Lanka …….In the future, water quality will need to be id d h tti t t t t fconsidered when setting targets to access to safe
water. Despite efforts to compile global and country water quality data, measuring safety of water can be difficultwater can be difficult …………
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Future Targets 2020
9.5%90%
100%
gCompared with 2010
34.0 %
40 5 %
16%40%
70%
80%
90%
Point40.5 %
22%
41%
40%
50%
60%Point SourcesRural Piped
Pipe‐borne Rural Coverage by CBO and LA
Pipe‐borne Water Supply by the NWSDB
Safe Water through other sources 38%
17%
20%
30%
40% PipedUrban
MDG T t f S f W t S l f
Safe Water through other sources
No access 22%
0%
10%
2010 2020MDG Target for Safe Water Supply forSri Lanka in 2015 is 85% and it is on track
2010 2020
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Major Ri ersMajor RiversKelani, Mahaweli, Kalu, Maha Oya Walawe, etcetc.
Major Irrigation TanksKala Wewa Parakrama Samudraya NuwaraKala Wewa, Parakrama Samudraya, NuwaraWewa, Chandrika Wewa, Lunugamwehera, etc.etc.
Irrigation Tanks Improved and Used;Unichchi Tank, Ridiyagama etc.y g
Impounding Reservoirs for Drinking WaterLabugama, Kalatuwawa, Tampana etc., Basnagoda (Proposed),Yatimahana(Proposed), Wee Oya (Proposed) etc.
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LABUGAMA DAM ‐ BASIC DETAILS
YEAR OF CONSTRUCTION 1886LOCATION LABUGAMA
MAXIMUM HEIGHT ABOVE RIVER BED 21.35mCREST LEVEL 112.26m(MSL)CREST LENGTH 125mCREST WIDTH 5.5mFULL SUPPLY LEVEL 109.52m(MSL)MINIMUM OPERATING LEVEL 91 2m(MSL)MINIMUM OPERATING LEVEL 91.2m(MSL)STORAGE AT FULL SUPPLY LEVEL 89.1 million m3
(1960X107 gallon)SPILL WAY 15 0m LONGSPILL WAY 15.0m LONG
SCOUR 1200mm DIA. PIPEOUTLET PIPES 500mm DIA.
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KALATUWAWA DAM ‐ BASIC DETAILS
YEAR OF CONSTRUCTION 1955LOCATION KALATUWAWA
MAXIMUM HEIGHT ABOVE RIVER BED 21.96mCREST LEVEL 115.49m(MSL)CREST LENGTH 283m(CONCRETE DAM)
67m(EARTH DAM)CREST WIDTH 2.44mFULL SUPPLY LEVEL 112 77 (MSL)FULL SUPPLY LEVEL 112.77m(MSL)MINIMUM OPERATING LEVEL 95.38m(MSL)STORAGE AT FULL SUPPLY LEVEL 140.9 million m3
(3100X107 gallon)(3100X107 gallon)SPILL WAY 30.5m LONG
SCOUR 1200mm DIA. PIPESCOUR 1200mm DIA. PIPEOUTLET PIPES 1200mm DIA.
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Abstractions From Kelani Ganga (At Ambatale)(At Ambatale)
250
200
150 Proposed NewWaterAbstractions
100(MGD)
TotalAbstraction
50(MGD)
02008 2009 2011 2020
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New Irrigation Reservoirs/Projects with Allocations for Drinking Water
Uma Oya, Kekirioboda, Deduru Oya, Yan Oya etc.
Tributaries and StreamsBomuru ella, Paradeka, Kirama Oya, etc
Ground Water (Shallow and Deep)
Shallow AcquifersMurunkan, kalpitiya, Wallipuram etc. .
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C ti d d (I i tiCompeting demands (Irrigation vs. Drinking water, Power, Recreation etc.)- aggravated during droughts. Ad / i lAdverse/ extreme environmental conditions and patterns, (Global Warming !) ; Restrictions !!Rapid depletion of catchments and watersheds due to human activities Neglected, Unprotected, Rapid deterioration of water quality – Algae, Chemicals, Heavy Metals, etc.Aggravation of Salinity Intrusion from sand and gem mining
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Causes of algal bloomsg
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F t d tFragmented water resourcemanagement from Conflicts betweenauthorities and duplication ofresponsibilitiesresponsibilitiesOveruse of chemical fertilizers andpesticides
Haphazard discharge/ disposal oftoxic industrial waste, human wasteand solid waste to water bodies
Lapses in Regional, urban and landuse planning.
Emerging water related chronicdiseases. (Eg. CKDu, Cancers ???)
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Integrated Water Resources ManagementIntegrated Water Resources Management
Improving waste disposal systems and regulations
Strengthening environmental Acts/ Regulations and
Local Authority capacities/ legislations
Improved physical planning
Launching of catchment/watershed protectionLaunching of catchment/watershed protection
programs
P ti W t R d R liPromoting Water Reuse and Recycling
Construction of salinity barriers
and upstream reservoirs
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Ensuring minimum environmental flowsEnsuring minimum environmental flows
Maintaining dedicated reservoirs for extreme events
Improving waste disposal systems for domestic wastes,
industrial wastes and solid waste dump leachate.
Per capita demand reassessment and management
Promoting alternate sources except for drinking and cookingPromoting alternate sources except for drinking and cooking
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Long Term Scenario – The Dream
• Water Quantity Ensured• Water Quantity Ensured; – Catchments Preserved & Natural Forests Flourished – Latest plant technology interlinked with indigenous knowledge and l t t t h l f i it i iti ti tlatest technology for mapping, monitoring, mitigation etc., Carbon Trading ??
• Water Quality Improved;– Sources protected – Scientifically controlled sand/gem mining, environmentally friendly waste discharge treatment, solid wastes recycled & value added.
– Nanotechnology/biotechnology used for water & wastewater treatment and optimized organic farming
– Highly sophisticated natural pest & weed control – Latest technology (satellites!) for quality monitoring & early warnings
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Long Term Scenario – The Dream (Contd.)
• Water managed efficiently;– Policy for priority/sharing during crisis & due to climate change simulated with real time technologychange simulated with real time technology.
– Highly water efficient Plant technology– Water saving and re‐using technologies for all users
• Institutional– Joint efforts between all stakeholders– R & D Programs collaborated between Universities industry &R & D Programs collaborated between Universities, industry & sector institutions.
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