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The weir-related data entered for the storage node refers to the volume of the upstream reach that is inundated for a given operating level of the weir. The outlet relationships of the weir allow you to define a default outlet, which represents the main downstream flow path from the weir. For a re-regulating weir, this should be a Gated Spillway. Ensure that you incorporate the rating curve further downstream of the default outlet to constrain the maximum outlet capacity of the Gated Spillway.
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| Note: Outlets MUST be configured correctly; a default outlet MUST be set as a regulated release. The weir functionality will not operate to target levels and a warning will appear when the default outlet is set as an unregulated release. |
Figure 1. Weir, Upstream Reach
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Under Operating Targets (shown here), both Minimum operating level and Maximum operating level are only used when the storage is configured as a weir.
The default release outlet for a weir MUST be unregulated.
Outlets MUST be configured correctly, and an ungated spillway must NOT be configured as the default outlet.
The The storage will not release water to satisfy downstream requirements if this results in the water level dropping below the minimum operating level. Likewise, water will be released to prevent the storage rising above the maximum operating level.