Aposelemis dam, water treatment and supply works in northern Crete island

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Project description

The project concerns the greater Heraklion and Ag Nikolaos towns water supply and includes the dam, the reservoir, Aposelemis reservoir water mains, TBM tunnel for diversion from the Lasithi plateau, water mains to the reatment plants, water treatment plants, water mains to Heraklion and Ag Nikolaos, other access works and road construction.


The dam is 56 m heigh. It is of rockfill type with an impervious clay core, upstream and downstream rock cells, spillway, spillway delivery canal and flip bucket
- The Lasithi plateau diversion to the Aposeslemis reservoir includes a TBM excavated 3,5km long and 14% steep tunnel
- The water treatment plants include pre-ozonation, coaggulation, sedimentation, filtering, post-chlorination and sludge treatment
- The main pipelines from the dam to the water treatment plant, ~ 8 km long, consist of D1200 and D1100 steelpipes and 2 tunnels (1590, 2050m long).
- The water main to Heraklion is a D1100 to D500 steelpipe, ~30 km long.
- The water mains to Ag Nikolaos (~ 32.5 km long) are a D500 to D600 steelpipe and a 670 long, 3m diameter tunnel.

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