In addition to the Water Act, there is also a specific law addressing regional water authorities. The priority of social and ecological needs that shall determine the distribution of available surface water in the event or threat of a water shortage shall be laid down by administrative order. Further rules shall be laid down by or pursuant to that order or, in cases designated in such order, by provincial order, regarding the priority referred to in subsection 1. These rules may also provide for application mutatis mutandis of that priority to the available surface water.