S-3.1.01, r. 1 - Dam Safety Regulation

Section 22 Disposition versions

2023-07-06

22. For a dam of which at least half the inflow during floods is controlled by another dam operated upstream, the safety check flood is, subject to section 24, the greater of

(1)  the safety check flood determined under section 21 or 21.1; and

(2)  the lesser of the 10,000-year flood and the inflow equivalent to the total available discharge capacity of the upstream dam together with the local inflows.

If more than 1 dam is located on the same watercourse upstream of the dam in question, the flow to be considered is the flow equivalent to the discharge capacity of the upstream dam with the greatest discharge capacity, taking the local inflows and the flood routing by the other dams into account. This rule also applies if the upstream dams are located on different watercourses; however, in that event, the flow that must be considered is the total flow obtained by adding, for each watercourse, the flow equivalent to the discharge capacity of the upstream dam with the greatest discharge capacity, taking the local inflows and flood routing into account.

This section does not apply to a dam whose failure consequence category is “very low” or “low”.

O.C. 300-2002, s. 22; O.C. 402-2011, s. 2; O.C. 901-2014, s. 3; O.C. 989-2023, s. 17.

2014-11-13

22. For a dam of which at least half the inflow during floods is controlled by another dam operated upstream, the safety check flood is, subject to section 24, the greater of

(1)  the safety check flood determined under section 21 or 21.1; and

(2)  the lesser of the 10,000-year flood and the inflow equivalent to the discharge capacity of the upstream dam together with the local inflows.

If more than 1 dam is located on the same watercourse upstream of the dam in question, the flow to be considered is the flow equivalent to the discharge capacity of the upstream dam with the greatest discharge capacity, taking the local inflows and the flood routing by the other dams into account. This rule also applies if the upstream dams are located on different watercourses; however, in that event, the flow that must be considered is the total flow obtained by adding, for each watercourse, the flow equivalent to the discharge capacity of the upstream dam with the greatest discharge capacity, taking the local inflows and flood routing into account.

This section does not apply to a dam whose failure consequence category is “very low” or “low”.

O.C. 300-2002, s. 22; O.C. 402-2011, s. 2; O.C. 901-2014, s. 3.

2012-09-01

22. For a dam of which at least half the inflow during floods is controlled by another dam operated upstream, the safety check flood is, subject to sections 23 and 24, the greater of

(1)  the safety check flood determined under section 21; and

(2)  the lesser of the 10,000-year flood and the inflow equivalent to the discharge capacity of the upstream dam together with the local inflows.

If more than 1 dam is located on the same watercourse upstream of the dam in question, the flow to be considered is the flow equivalent to the discharge capacity of the upstream dam with the greatest discharge capacity, taking the local inflows and the flood routing by the other dams into account. This rule also applies if the upstream dams are located on different watercourses; however, in that event, the flow that must be considered is the total flow obtained by adding, for each watercourse, the flow equivalent to the discharge capacity of the upstream dam with the greatest discharge capacity, taking the local inflows and flood routing into account.

This section does not apply to existing dams in the Very Low or Low Consequence categories under sections 17 and 18.

O.C. 300-2002, s. 22; O.C. 402-2011, s. 2.