Connect Saint Helena Ltd
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Raw Water Systems

Connect Saint Helena Ltd has a programme of works to ensure the security of the island’s precious water supply.  There are several aspects to this programme which include the following:
  • Replacement of reservoir linings
  • Construction and upgrade of water abstraction chambers
  • Enlargement of reservoirs
  • Upgrade of raw water pipelines
  • Monitoring of boreholes

Reservoirs
A reservoir is basically a large dugout or hole in the ground which is lined with a synthetic or man made lining.
The island’s only earth dam, namely the Harpers 2 Dam is situated near Francis Plain with an embankment and a concrete lined spillway, which was built directly into a natural stream.
Picture
Harpers 2 Earth Dam
Connect Saint Helena Ltd currently have 12 raw water reservoirs, 4 of which are used to supply water for agricultural consumers.

You might wonder what is the capacity of each of these reservoirs?  See below details. ​
Red Hill raw water system
Picture
Harpers 1 - 13,729m3
Picture
Harpers 2 (Earth Dam) - 24,703m3
Picture
Harpers 3 - 19,210m3
Picture
Scotts Mill reservoir - 6,690m3
Hutts Gate raw water system
Picture
Hutts Gate 1 - 1,917m3
Picture
Hutts Gate 2 - 10,476m3
Picture
Grapevine Gut reservoir - 1,152m3
Picture
Longwood Farm 1 - 12,801m3
Picture
Longwood Farm 2 - 7,092m3
Picture
Millfield reservoir - 11,403m3
Picture
Small Irrigation reservoir - 487m3
Levelwood raw water system
Picture
Levelwood reservoir - 3,762m3
Raw water abstraction systems
Raw water abstraction systems are placed at locations where water naturally flows and are built out of stone, concrete and other natural materials.  A well designed abstraction system captures as much water as possible and funnels it into pipes and minimises loss. Once collected in this way, the water is gravitated through a network of pipes to the reservoirs.  

Over the years we have reviewed and redesigned our raw water abstraction systems so that they are now able to collect a higher volume of water.  Silt traps have also been added to aid maintenance and reduce the volume of suspended solids entering the system.  
Picture
Raw water abstraction at Oakbank prior to 2016
Picture
New and improved raw water abstraction system at Oakbank
Boreholes
Beneath the surface of the ground, there is a network of underground streams or aquifers that mostly contain fresh water.  A borehole is where we drill into this network or an aquifer and pump the water to the surface.
We currently pump water from and maintain a number of boreholes that feed the Red Hill, Hutts Gate and Levelwood water systems as and when needed.  
Raw water pipelines
These pipelines carry water from the raw water abstraction systems to the reservoirs.  When Connect was formed in 2013 we inherited already aging pipe systems.  Since then we have come a long way in renovating, modifying and upgrading these pipe systems so that they can carry a higher volume of water and have a longer lifespan. Raw water collection systems are constantly being improved to make the most of the rainfall we get.  
Related Links:
  - Services
    - Water Treatment
    - Water Networks
          > Water Savings Tips
          > Water Supply T&Cs
    - Waste Water
    - Infrastructure
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  • Home
  • About Us
    • Vision & Values
    • Team Commitment
    • Board of Directors
    • Management Team
    • Work Teams
    • Vacancies
  • Projects
    • Operations
    • Water Supply
    • Raw Water Systems
  • Finance & Business Support
    • Billing >
      • Your Bill Explained
      • Meter Reading
      • Property Access
    • Utilities Tariff
  • Services
    • Electricity Distribution >
      • Saving Tips
      • T&Cs
    • Electricity Generation >
      • Diesel Power
      • Wind Power
      • Solar Power
    • Water Treatment
    • Water Networks >
      • Saving Tips
      • T&Cs
    • Waste Water >
      • T&Cs
    • Infrastructure
  • Press Releases & other Documents
  • Announcements
  • Download Library
    • Members Information
    • Policies
    • Forms
    • Tariffs and other charges
    • Accounts
    • Utilities Regulatory Authority
    • Electricians
    • Customer Complaints Procedure
    • Lab Reports (Treated)
    • Water Quality Reports
  • Contact
    • FAQs
    • Web Links