Water Treatment Works
All of the water supplied by the company is treated at one of it’s two water treatment works located at Handois and Augrès. Both sites are situated at approximately the same height above sea level so as to facilitate the movement of water into the distribution system.
The treatment works at Handois are supplied directly from Handois Storage Reservoir. The reservoir acts as a collecting point for water pumped directly from other reservoirs and raw water sources and collected in the catchment area.
Augrès Treatment Works are supplied directly from the raw water transfer main via the Beechfield Raw Water Storage Tank which acts as a header tank for the works.
Both treatment works use the same two-stage method of water treatment comprising chemically assisted sedimentation and rapid gravity filtration followed by disinfection using chlorine and ammonia.
Each treatment works is individually capable of supplying at least the average daily demand and both are capable of supplying all areas within the treated water network.
The treatment works operators use telemetry systems to select the best quality raw water for treatment. This reduces the amount of treatment required and ensures that the water produced is of a consistently high standard.
Output from the treatment works can vary dramatically throughout the time of day and time of year. Treated water flow readings and service reservoir levels are monitored remotely at the treatment works and water flows are adjusted to meet the various demand profiles.
The schematic below shows (at a high level) how the process works at both of our water treatment works.
The treatment works are equipped with on-line monitoring equipment which measures the quality of the water at all stages of treatment. In addition, samples are regularly taken by the Company’s laboratory staff for analysis.
(for a larger view please click on the image)
|Name||Year constructed||Location||Maximum daily capacity (Megalitres per day)||Water feeds into|
|Augrès||1964||Trinity||18||Treated water service reservoirs|
|Handois||1931||St Lawrence||28||Treated water service reservoirs|