DOMINICA WATER & SEWERAGE COMPANY LTD

Transcription

1 DOMINICA WATER & SEWERAGE COMPANY LTD

2 COMPANY s PROFILE The Dominica Water and Sewerage Company Limited (DOWASCO) is a registered company owned wholly by the Government of the Commonwealth of Dominica. DOWASCO was established as a water and sewerage company by an act of Parliament, Water and Sewerage act N0. 17, in December of DOWASCO is equipped and computerized for financial, administrative and clerical support services, and operates an equipped laboratory for daily water quality monitoring and treatment of the water supplies.

3 Vision and Mission Vision To be recognized as a company of excellence in providing water and sewerage services. Mission DOWASCO exists to enhance the lives of its customers by providing quality water and sewerage services through the use of appropriate technology, skilled employees, sound management and environmentally sustainable practices.

4 DOWASCO s SERVICE s Domestic, Commercial, and Industrial Water Supply Water Supply to Public Standpipes, Public Facilities and Fire Hydrants Bulk Water Sales to Ships Sewerage Collection and Treatment Water Resources Management

5 WATER SUPPLY SYSTEMS Dowasco maintains 44 independent water supply system The largest serves the cities of Roseau/Environs, Portsmouth/Picard, Wesley/Woodfordhill/Marigot, Grandbay, Carib Territory/Atkinson 9 water systems serves population between 1,000-3,000 people 35 other systems serves population < than 1,000 people

6 WATER SUPPLY SYSTEMS DOWASCO uses gravity-fed supply systems as well as pumping systems All sources utilized are fresh surface water Most surface water comes from rivers with a few sources originating from springs

7 DOMINICA WATERSHEDS WATERSHED MANAGEMENT UNIT 1 Morne Aux Daibles complex 2 Blenheim* 3 Hampstead* 4 Salee 5 Woodford Hill complex 6 Eden 7 Clyde* 8 Pagua* 9 Morne la Source complex 10 Belle Fille 11 Good Hope complex 12 Rosalie 13 Ouayaneri-Morne Jaune complex 14 Sari-Sari 15 Boetica complex 16 Pt. Mulâtre 17 Petite Savanne complex 18 Stewart 19 Grand Bay complex 20 Soufriere-Scotts Head complex 21 Sibouli* 22 Roseau 23 Boeri* 24 Massacre-Mahaut complex 25 Belfast* 26 Layou 27 Macoucheri complex 28 Batali 29 Coulibistri complex 30 Colihaut* 31 Dublanc* 32 Jargie* 33 Picard 34 Indian 35 Cabrits/Douglas Bay complex Watershed management unit complexes are an amalgamation of more than one watershed basin. Watershed areas of less than 500 ha were amalgamated * Watershed management units dominated by a main drainage basin but amalgamated with a small adjacent basin

8 WATER CATCHMENT AREAS

9 MAJOR CONSTRAINTS ON SMALL WATER SYSTEMS Large fluctuation on flow quantities and quality Limited flows during dry spells High turbidity level during heavy rainfall Cultivation activities in watershed Road and other infrastructural construction upstream of intake High maintenance cost and operational challenges due to treacherous terrain and difficult access Catchment areas and transmission mains being on privately owned lands Lack of effective monitoring of use of pesticides/fertilizers on private farms upstream of intakes Deforestation Accelerated Soil Erosion Unplanned Activities and Development from other sectors Insufficient water storage capacity and aging infrastructure Lack of sufficient mechanisms and equipment for effective monitoring of rivers/water catchments

10 MANAGEMENT OF THE WATER RESOURCE AND IMPACTS OF CLIMATE CHANGE/VARIABILITY Priority Risk Top Three Vulnerable Communities Interventions (More extreme events) - Water Salisbury, Morne shortages due to increased Jaune/Riviere Cyrique, Bense drought and storms. East Coast Water Supply System US$3.5 million West Coast Water Supply Storage Tanks US$3 million Changes in local and national Layou, Scotts Head temperatures regimes Impact on recreational water (diving, tourism) and fishing from increased incidents of pollution Changes in rainfall patterns - Canefield, Calibishie, Petite Contamination of surface Savanne and ground water due to increased runoff, flooding, soil erosion and landslides arising from the greater frequency of extreme rainfall events Effective waste and waste-water treatment management US$8 million (Portsmounth) Climate proof vulnerable water infrastructure US$18 million (WA1 Upgrade) Improved climate proofed drainage US$10 million

11 Priority Risk Top Three Vulnerable Communities Changes in rainfall Colihaut, Mero, patterns Increased Jimmit, Toucarie marine pollution from water resources and impact on tourism, fishery and recreation use More severe weather Salisbury, Morne events - Water shortages Jaune/Riviere due to increased drought Cyrique, Bense More severe weather Massacre, Grand events Damage to water Fond, Delices infrastructure and impact on costs for water supply Interventions Inventory of surface and ground water resources, water balance assessment, continued monitoring of water resources, hydro-met monitoring stations US$2.3 million Implement and enforce environmental protection legislation Integrated watershed and coastal zone management and improved land use planning US$1.5 million East Coast Water Supply System US$3.5 million West Coast Water Supply Storage Tanks US$3 million Climate proof vulnerable water infrastructure US$18 million (WA1 Upgrade)

12 Priority Risk More severe weather events Contamination of surface and ground water due to increased runoff, flooding, soil erosion and landslides arising from the greater frequency of extreme rainfall events More severe weather events - Increased water-borne and vector borne disease Top Three Vulnerable Communities Canefield, Calibishie, Soufriere Interventions Increased water storage and treatment capacity US$12 million Portsmouth, Roseau, St. Increased water storage and Joseph Village treatment capacity US$12 million

13 SOME OF THE IMPACTS ON THE WATER SYSTEM INFRASTRUCTURES Soil Erosion after Heavy Rainfall

14 RIVER FLOODING AND DAMAGED INFRASTRUCTURES

15 Landslides Upstream Water Catchment areas

16 Springfield Intake Water Network Pipelines

17 MANAGEMENT OF THE WATER RESOURCE AND IMPACTS OF CLIMATE CHANGE/VARIABILITY THE NEED FOR HYDRO-METEREOLOGICAL SYSTEMS: To predict adverse climate weather related outcomes To be able to answer the following questions: Where? When? Severity Who and What is at Risk? For use in watershed management For use in disaster planning To enhance resilience For creation and availability of scientific database To determine economic impact of human activities as relates to climate change For improving water resource efficiency For technical advise/decision-making and to assist in mitigation

18 RESOURCES REQUIRED FOR DEVELOPING HYDROMETEREOLOGICAL SYSTEMS COLLABORATIVE Stream Gauge Equipment Hydro-meteorological Stations Flow meters Awareness building/ Public Education Increase in technical personnel Technical training Financing

19 HYDRO-METEREOLOGICAL STATIONS IN DOMINICA (PROPOSED AND EXISTING)

20 HIGHLIGHTS OF WORK OF HYDROMET COMMITTEE Pressure probe in pipe

21 Rosalie Radar Sensor

22 Spot Measurements (To establish and maintain the discharge rating curves) Salt Dilution Method + +

23 THANK YOU