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Platanovryssi Dam

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Owner: Public Power Corporation of Greece
Designer: DAYE, PPC and Malcolm Dunstan & Associates (in association with Sir William Halcrow & Partners)
Contractor: AEGEK, Hidrogradnja, ASI-RCC J.V.
Location: Parenesti, Drama Prefecture, Greece
River: Nestos
Height: 95 m
Length: 305 m
Volume of RCC: 420 000 m³
Volume of dam: 440 000 m³
Reservoir capacity: 84M m³
Design flood: 7330 m³/sec
Start of Project: 30.01.1989 (Diversion tunnel)
Start of RCC: 18.10.1995
Completion of RCC: 10.03.1997 (5-month summer closedown)
Completion of Project: 30.06.1999
Forming of upstream face: Horizontally-slipformed interlocking facing elements at a slope of 0.10:1 (H:V)
Forming of downstream face: Horizontally-slipformed stepped interlocking facing elements at a slope of 0.75:1 (H:V)
Forming of spillway: Reinforced concrete slab cast on top of the downstream steps
Mixture proportions:
ASTM Type-I cement 50 kg/m³
ASTM Class C flyash 225 kg/m³
Water 133 kg/m³
Coarse aggregate 1300 kg/m³
Fine aggregate 625 kg/m³
Workability:
Loaded VeBe time 15 sec±

Aerial view of site before start looking downstream (click on image to enlarge)

Closure of the coffer dam and diversion of Nestos river (click on image to enlarge)

Placement of RCC at night (click on image to enlarge)

Placement from top of right abutment (click on image to enlarge)

Construction at bottom gallery level (click on image to enlarge)

Construction at approximately one-third height (click on image to enlarge)

Overall placement showing lack of plant on dam (click on image to enlarge)

Slipforming of an upstream facing element (click on image to enlarge)

Dam nearing completion from downstream (click on image to enlarge)

Powerhouse under construction (click on image to enlarge)

Auxillary spillway in operation (click on image to enlarge)

Bottom outlet in operation (click on image to enlarge)

Aerial view of completed dam from upstream (click on image to enlarge)

Completed Powerhouse (click on image to enlarge)

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