Priority in time gives the superior water right. Priority of a water right acquired under this chapter dates from the filing of an application with the department of water resources, except for water applied to domestic or livestock purposes, or fish, wildlife, and other recreational uses in which case the priority date must relate back to the date when the quantity of water in question was first appropriated, unless otherwise provided by law.

Priority of appropriation does not include the right to prevent changes in the condition of water occurrence, such as the increase or decrease of streamflow, or the lowering of a water table, artesian pressure, or water level, by later appropriators, if the prior appropriator can acquire reasonably the prior appropriator’s water under the changed conditions.