pont-et-massènedam an innovating spillway design to

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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


An innovating spillway design to maximize dam safety


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)




20th century:

• Little flapgates with counterweight added

• WL raised by 1.1 m

21th century:

• Lack of safety

• WL lowered by 1.1 m




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



Flapgates? Fusegates? An additional spillway?

New design for discharge capacity improvement

New design for safety improvement


Fusegates : an overview

Developped, designed and built by Hydroplus




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






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)


Five different solutions have been studied



+ x 22m

+ x 15m+

++

x 30m

x 30m

DC #1 DC #2 DC #3 DC #4

A -

B

C

D - -

E - - -




+ x 22m

+ x 15m+

++

x 30m

x 30m

7m

3 x 9m

2 x 7m




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




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




Fusegates : intake towerIntake tower Feeding pipes Fusegates




Civil works




Flapgates construction




Fusegates construction




Conclusions

• Discharge safety

• Downstream security

Waterlevel variability

Thank you to the contractors and all their partners

4 design criteria




THANK YOU FOR YOUR ATTENTION

Merci

Sadri Mevel, Ponts ParisTech 2013

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