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Pont-et-Massène Dam
An innovating spillway design to
maximize dam safety•Journée du CFBR – 28/01/2017
HYDRO 2016 Conference – 10-12 October 2016 Del Rey – Lapeyre – Mével
Pont-et-Massène Dam
An innovating spillway design to maximize dam safety
HYDRO 2016 Conference – 10-12 October 2016 Del Rey – Lapeyre – Mével
H = 22 m, L = 150 m
WL = 20 m (constr.)
30m ungated spillway
Built in 1878-1882
For the low flow replenishment
of the Bourgogne Channel
Owned by French state (VNF)
Pont-et-Massène Dam
An innovating spillway design to maximize dam safety
HYDRO 2016 Conference – 10-12 October 2016 Del Rey – Lapeyre – Mével
20th century:
• Little flapgates with counterweight added
• WL raised by 1.1 m
21th century:
• Lack of safety
• WL lowered by 1.1 m
Pont-et-Massène Dam
An innovating spillway design to maximize dam safety
HYDRO 2016 Conference – 10-12 October 2016 Del Rey – Lapeyre – Mével
In 2010: Special Reviewing Process
• Design flow : from 130 m3/s to 475 m3/s (return period : 3 000 yr)
• The owner wanted to raise the WL back to 21 m
• Enlarging the spillway wasn’t easy
Pont-et-Massène Dam
An innovating spillway design to maximize dam safety
Flapgates? Fusegates? An additional spillway?
New design for discharge capacity improvement
New design for safety improvement
HYDRO 2016 Conference – 10-12 October 2016 Del Rey – Lapeyre – Mével
Fusegates : an overview
Developped, designed and built by Hydroplus
Pont-et-Massène Dam
An innovating spillway design to maximize dam safety
HYDRO 2016 Conference – 10-12 October 2016 Del Rey – Lapeyre – Mével
Five design criteria for the discharge safety
• DC #1: Q3 000 under the MWL and Q10 000 under the crest wall
• DC #2: If a flapgate is stuck, then Q1 000 under the MWL
• DC #3: After an accidental flapgate opening, Q < Q20
• DC #4: The lower fusegate should not fuse if Q < Q100
Pont-et-Massène Dam
An innovating spillway design to maximize dam safety
HYDRO 2016 Conference – 10-12 October 2016 Del Rey – Lapeyre – Mével
Pont-et-Massène Dam
An innovating spillway design to maximize dam safety
Five design criteria for the discharge safety
• DC #1: Q3 000 under the MWL and Q10 000 under the crest wall
• DC #2: If a flapgate is stuck, then Q1 000 under the MWL
• DC #3: After an accidental flapgate opening, Q < Q20
• DC #4: The lower fusegate should not fuse if Q < Q100
Discharge safety
Downstream inhabitants security
A 3 Fl. G (3 x 9m)
B 1 Fl. G (1 x 7m) + Fu. G (22m)
C 2 Fl. G (2 x 7m) + Fu. G (15m)
D Fu. G (30m)
E PK Weir (30m)
HYDRO 2016 Conference – 10-12 October 2016 Del Rey – Lapeyre – Mével
Five different solutions have been studied
Pont-et-Massène Dam
An innovating spillway design to maximize dam safety
+ x 22m
+ x 15m+
++
x 30m
x 30m
DC #1 DC #2 DC #3 DC #4
A -
B
C
D - -
E - - -
HYDRO 2016 Conference – 10-12 October 2016 Del Rey – Lapeyre – Mével
Pont-et-Massène Dam
An innovating spillway design to maximize dam safety
+ x 22m
+ x 15m+
++
x 30m
x 30m
7m
3 x 9m
2 x 7m
HYDRO 2016 Conference – 10-12 October 2016 Del Rey – Lapeyre – Mével
Pont-et-Massène Dam
An innovating spillway design to maximize dam safety
HYDRO 2016 Conference – 10-12 October 2016 Del Rey – Lapeyre – Mével
Pont-et-Massène Dam
An innovating spillway design to maximize dam safety
Flapgates : preliminary design by ISL ; final design by Rouby
H = 4.05 m // L = 7.00 m
Downstream security :
• Max. flow increase = 60 m3/s/h
Upstream security :
• PLC Algorithm => Z = WL ± 5 cm
HYDRO 2016 Conference – 10-12 October 2016 Del Rey – Lapeyre – Mével
Pont-et-Massène Dam
An innovating spillway design to maximize dam safety
Fusegates : preliminary design by ISL ; final design by Hydroplus
H = 4.05 m // L = 5.00 m
Concrete
Tipping levels
• 1st tipping level ≥ WL for Q100
• 3rd tipping level ≤ MWL
• 2nd tipping level : mean of 1st and 3rd
HYDRO 2016 Conference – 10-12 October 2016 Del Rey – Lapeyre – Mével
Pont-et-Massène Dam
An innovating spillway design to maximize dam safety
Fusegates : intake towerIntake tower Feeding pipes Fusegates
HYDRO 2016 Conference – 10-12 October 2016 Del Rey – Lapeyre – Mével
Pont-et-Massène Dam
An innovating spillway design to maximize dam safety
Civil works
HYDRO 2016 Conference – 10-12 October 2016 Del Rey – Lapeyre – Mével
Pont-et-Massène Dam
An innovating spillway design to maximize dam safety
Civil works
HYDRO 2016 Conference – 10-12 October 2016 Del Rey – Lapeyre – Mével
Pont-et-Massène Dam
An innovating spillway design to maximize dam safety
Flapgates construction
HYDRO 2016 Conference – 10-12 October 2016 Del Rey – Lapeyre – Mével
Pont-et-Massène Dam
An innovating spillway design to maximize dam safety
Fusegates construction
HYDRO 2016 Conference – 10-12 October 2016 Del Rey – Lapeyre – Mével
Pont-et-Massène Dam
An innovating spillway design to maximize dam safety
Fusegates construction
HYDRO 2016 Conference – 10-12 October 2016 Del Rey – Lapeyre – Mével
Pont-et-Massène Dam
An innovating spillway design to maximize dam safety
Conclusions
• Discharge safety
• Downstream security
Waterlevel variability
Thank you to the contractors and all their partners
4 design criteria
HYDRO 2016 Conference – 10-12 October 2016 Del Rey – Lapeyre – Mével
Pont-et-Massène Dam
An innovating spillway design to maximize dam safety
THANK YOU FOR YOUR ATTENTION