S-3.1.01, r. 1 - Dam Safety Regulation

Section 30 Disposition versions

2023-07-06

30. Subject to section 76, an impounded water management plan must be drawn up for every dam or project, before its commissioning, by its owner, taking into account the dams located on the rim of the same reservoir and belonging to another person, except

(1)  dams whose failure consequence category is “very low” or “low” and which are not associated dams;

(2)  dams on which the only discharge facility is a free weir; and

(3)  dams for which an engineer demonstrates that it is not necessary to manoeuvre the dam discharge facilities during floods.

The plan must describe all the measures that will be taken by the owner to manage the impounded water safely, in particular during situations likely to imperil the safety of persons or property located upstream or downstream of the dam, except those covered by the emergency action plan.

The plan must, in particular, include the following information:

(1)  a description of the hydrographical network upstream and downstream of the dam, including flood estimates and the catchment basin lag time as well as, where applicable, reference to other structures in the network that may affect the operation of the dam or whose operation the dam may affect and a quantification of any such impact;

(2)  the operational constraints relating to the safety of persons or property located upstream or downstream of the dam during normal operation and during floods;

(3)  the full supply level;

(4)  the flow and level of the safety check flood;

(5)  the level or depth at which the reservoir overflows at its lowest point;

(6)  the reservoir storage curve, if available;

(7)  the discharge curve, depending on the water level;

(8)  if there are any inhabited areas near the dam, the upstream and downstream flood limits;

(9)  a description of the measures that will be taken by the owner to manage the impounded water, in particular when the flow reaches the lower flood level, that is, the flow at which property may be affected by the discharged water;

(10)  where applicable, a description of the communications strategy for providing information on hazards to the civil protection authorities, other dam owners in the hydrographic system, enterprises, and inhabitants who will ultimately be affected by the implementation of the impounded water management plan.

O.C. 300-2002, s. 30; O.C. 989-2023, s. 21.

2012-09-01

30. An impounded water management plan must be drawn up for every dam or project before its commissioning. The plan must describe all the procedures to be followed by the owner for the safe management of the impounded water, in particular during situations in which persons or property located upstream or downstream are at risk, excluding the emergency action plan procedures.

The plan must include

(1)  a description of the hydrographical network upstream and downstream of the dam, including flood estimates and the catchment basin lag time as well as, where applicable, reference to other structures in the network that may affect the operation of the dam or whose operation the dam may affect and a quantification of any such impact;

(2)  operational constraints relating to the safety of persons or property located upstream or downstream of the dam during normal operation and during floods;

(3)  the full supply level;

(4)  the flow and level of the safety check flood;

(5)  the level or depth at which the reservoir overflows at its lowest point;

(6)  the reservoir storage curve, if available;

(7)  the discharge curve;

(8)  if there are any inhabited areas near the dam, the upstream and downstream flood limits;

(9)  a description of the measures that will be taken by the owner to manage the reservoir when the flow reaches the lower flood level, that is, the flow at which property may be affected by the discharged water; and

(10)  where applicable, a description of the communications strategy for providing information on potential hazards to the civil protection authorities, other dam owners in the hydrographic system, enterprises and inhabitants that will ultimately be affected by the implementation of the impounded water management plan.

O.C. 300-2002, s. 30.