Within Source, "Restriction Curves" are an approach to controlling water supply within a model and are used to reduce the water volumes released to users when the volume in the storage is declining. For instance, if dam water volumes drop below 50%60%, restrictions on water supply will may be imposed for a period of time. Restrictions are usually lifted when dam water volumes exceed another dam volume higher than the volume at which the restriction was applied. In other words Thus a particular Restriction is not lifted until there is some significant recovery in stored water volume.
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