8. A process for the applicable water management district to annually examine an agricultural user's 5-year moving average supplemental irrigation water use against the annual supplemental irrigation needs in the 5-in-10-year rainfall condition beginning no earlier than 5 years following the effective date of the rules adopted under this section. If this annual examination indicates that the agricultural user's 5-year moving average use exceeds that needed in such rainfall condition for reasons other than prolonged periods of below average rainfall, the water management district may modify the agricultural user's permit to include an annual supplemental irrigation allocation based on both the amount of supplemental irrigation required during a 2-in-10-year rainfall condition and the amount of supplemental irrigation required during a 5-in-10-year rainfall condition as provided in rules adopted pursuant to this section. In such case, the supplemental irrigation allocation based on the 5-in-10-year rainfall condition shall be valid for only 5 years unless the agricultural user's 5-year moving average use continues to exceed the amount of supplemental irrigation needed during a 5-in-10-year rainfall condition for reasons other than prolonged periods of drought. Subparagraphs 7. and 8. may not be construed to limit the ability of the department or a water management district to establish different supplemental irrigation requirements as part of an existing or a future recovery or prevention strategy adopted pursuant to s. 373.0363, s. 373.042, or s. 373.0421. The uniform rules must include existing recovery strategies within the Central Florida Water Initiative Area adopted before July 1, 2016. The department may grant variances to the uniform rules if there are unique circumstances or hydrogeological factors that make application of the uniform rules unrealistic or impractical.